kth.sePublications
Change search
Refine search result
1 - 22 of 22
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1. Andersson, L.
    et al.
    Larsson, Per Tomas
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
    Bergström, Lennart
    KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. Department of Materials and Environmental Chemistry, Stockholm University.
    Evaluating pore space in macroporous ceramics with water-based porosimetry2013In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 96, no 6, p. 1916-1922Article in journal (Refereed)
    Abstract [en]

    We show that water-based porosimetry (WBP), a facile, simple, and nondestructive porosimetry technique, accurately evaluates both the pore size distribution and throat size distribution of sacrificially templated macroporous alumina. The pore size distribution and throat size distribution derived from the WBP evaluation in uptake (imbibition) and release (drainage) mode, respectively, were corroborated by mercury porosimetry and X-ray micro-computed tomography (μ-CT). In contrast with mercury porosimetry, the WBP also provided information on the presence of "dead-end pores" in the macroporous alumina.

  • 2.
    Bergström, L.
    et al.
    YKI, Institute for Surface Chemistry.
    Blomberg, Eva
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
    Probing polymeric stabilization in nonaqueous media by direct measurements2000In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 83, no 1, p. 217-219Article in journal (Refereed)
    Abstract [en]

    The steric repulsion induced by adsorbed layers of the commercial dispersant Hypermer KD3 has been probed by direct measurements in decalin. The forces are long range (commencing at 30-40 nm) and repulsive, and the distance dependence can be modeled with a simple scaling theory expression valid for polymer brushes. We obtain layer thicknesses of similar to 9-15 nm for the compressed layers, depending on KD3 concentration, whereas the undisturbed layers have a thickness of similar to 23-24 nm, independent of polymer concentration. Comparison of the measured interaction lengths with previous layer thickness estimates based on rheological studies shows that the polymer layers are compressed in dense suspensions.

  • 3. Bora, T.
    et al.
    Al-Hinai, M. H.
    Al-Hinai, A. T.
    Dutta, Joydeep
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Functional Materials, FNM.
    Phase Transformation of Metastable ZnSnO3 Upon Thermal Decomposition by In-Situ Temperature-Dependent Raman Spectroscopy2015In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916Article in journal (Refereed)
    Abstract [en]

    Temperature-dependent in-situ Raman spectroscopy is used to investigate the phase transformation of zinc metastannate (ZnSnO<inf>3</inf>) to zinc orthostannate (Zn<inf>2</inf>SnO<inf>4</inf>) induced upon annealing in the ambient. ZnSnO<inf>3</inf> microcubes (MCs) were synthesized at room temperature using a simple aqueous synthesis process, followed by characterization using electron microscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). Annealing of the ZnSnO<inf>3</inf> MCs was carried out up to 1000°C, while recording the Raman spectra in-situ at regular intervals. Phase transformation from metastannate to orthostannate was found to begin around 500°C with an activation energy of ~0.965 eV followed by the recrystallization into the inverse spinel orthostannate phase at ~750°C. Results from this study provide detailed understanding of the phase transformation behavior of perovskite ZnSnO<inf>3</inf> to inverse spinel Zn<inf>2</inf>SnO<inf>4</inf> upon thermal annealing.

  • 4.
    Dilner, David
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Pavlyuchkov, Dmytro
    Zienert, Tilo
    Kjellqvist, Lina
    Fabrichnaya, Olga
    Thermodynamics of the Mg-Mn-O system - Modeling and Heat Capacity Measurements2016In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916Article in journal (Refereed)
  • 5.
    Dilner, David
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Pavlyuchkov, Dmytro
    Zienert, Tilo
    Kjellqvist, Lina
    Fabrichnaya, Olga
    Thermodynamics of the Mg-Mn-O system-modeling and heat capacity measurements2017In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 100, no 4, p. 1661-1672Article in journal (Refereed)
    Abstract [en]

    In this study, a thermodynamic description of the Mg-Mn-O system is presented. Phase diagram data, structural information, and thermochemical data are used in the assessment. All solution phases are modeled using the compound energy formalism. In addition, heat capacity measurement of the MgMn2O4 and Mg6MnO8 phases are reported. The thermodynamic description reproduces thermochemical, structural, and phase diagram data.

  • 6.
    Grishin, Alexander
    et al.
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. Petrozavodsk State University, Petrozavodsk.
    Markova, Nadezhda P.
    Broadband luminescent ferroelectric biocompatible Er:(Na,K)NbO3 nanofibers2016In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916Article in journal (Refereed)
    Abstract [en]

    Dense homogeneous fabric composed from continuous bead-free erbium-doped sodium potassium niobate (Er:NKN) 100 lm long and 100-200 nm in diameter nanofibers was sintered by sol-gel calcination assisted electrospinning technique. X-ray diffraction revealed preferential cube-on-cube [001]-directional growth of fibers containing predominantly monoclinic Na0.35K0.65NbO3-type phase and significantly less of tetragonal NbO2, cubic Er2O3, and monoclinic ErNbO4 phases. Er doping with the concentration of 2 at.% provides readily detectable room-temperature broad-band photoluminescence (PL) centered at kPL = 0.55 and 0.98 lm being pumped, respectively, with 532 and 785 nm lasers. Impedance spectroscopy and static electrical tests revealed ferroelectric properties, electric field induced resistance switching and strong rectification effect in nanoporous sandwich Au/Er: NKN/Pt capacitive cell. Memristor-type current-voltage (I-V) characteristics originate from the electrochemical migration of oxygen vacancies at the n-type NKN oxide/high work function Pt cathode junction interface.

  • 7.
    Hallstedt, Bengt
    KTH, Superseded Departments (pre-2005), Metallurgy.
    Assessment of the CaO-Al2O3 System1990In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 73, no 1, p. 15-23Article in journal (Refereed)
    Abstract [en]

    A thermodynamic assessment of the quasi-binary system CaO-Al2O3 has been made using a computerized CALPHAD (calculation of phase diagrams) technique. The actual optimization was carried out with a computer program for the optimization of parameters in thermodynamic models called PARROT. The liquid phase is described by a simple two-sublattice subregular solution model with Ca2+ and Al3+ as cationic species and O2- as anionic species. All solid phases are treated as stoichiometric compounds. A consistent set of parameters describing the system is presented, and numerous comparisons with experimental data are made. There is a lack of accurate data in the high-alumina part of the system, and the importance of a better knowledge of the CaO·6Al2O3 phase is stressed.

  • 8.
    Maniewski, Pawel
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Optoelectronic Research Centre University of Southampton, Southampton UK.
    Wörmann, Tim J.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Holmes, Christopher
    Optoelectronic Research Centre University of Southampton Southampton UK.
    Gates, James C.
    Optoelectronic Research Centre University of Southampton Southampton UK.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Advances in laser‐based manufacturing techniques for specialty optical fiber2024In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916Article in journal (Refereed)
    Abstract [en]

    As demand for customized specialty fibers grows, standardized production methods face challenges. This article reviews industry standards and discusses potentially disruptive techniques that enable rapid prototyping and fabrication of optical fiber devices. Furthermore, we showcase laser powder deposition's (LPD) potential for additive manufacturing (AM) of customized glass structures. In the case of, for example, fiber preforms, although the feasible size is smaller than the industry standard, utilizing laser-based manufacturing techniques for a small batch production presents an attractive avenue for rapid prototyping and expedites material and design optimization. In the realm of AM of glass, LPD offers numerous benefits, including minimal shrinkage, high densification, and the ability to tailor glass composition to achieve desired optical properties. The article reviews the latest achievements and highlights future directions in this technology.

  • 9.
    Mao, Huahai
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
    Hillert, Mats
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
    Selleby, Malin
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
    Sundman, Bo
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
    Thermodynamic assessment of the CaO-Al2O3-SiO2 system2006In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 89, no 1, p. 298-308Article in journal (Refereed)
    Abstract [en]

    The CaO-Al2O3-SiO2 system has been assessed with the CALP-HAD technique, based on recent assessments of its binary systems. A new species AlO2-1 was introduced for modeling liquid Al2O3. The ternary liquid phase was described using the ionic two-sublattice model as (Al+3, Ca+2)(p) (AlO2-1, O-2, SiO4-4 SiO20)(Q). The available experimental data were critically examined and a self-consistent set of thermodynamic descriptions was obtained. Various phase diagrams and property diagrams, including isothermal sections, isoactivity lines, and a projection of the liquidus surface, are presented. Information on viscosity seems to support the use of the AlO2-1 species.

  • 10.
    Mao, Huahai
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Selleby, Malin
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Sundman, Bo
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Phase equilibria and thermodynamics in the Al(2)O(3)-SiO(2) system: Modeling of mullite and liquid2005In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 88, no 9, p. 2544-2551Article in journal (Refereed)
    Abstract [en]

    The AI(2)O(3)-SiO2 system has been reassessed using a solution model for mullite extending from sillimanite to a hypothetical state of alumina. The property of sillimanite, to be used to describe one of the end-members, was extracted from an analysis of the T-P phase diagram for AI(2)SiO(5) polymorphs. It was possible to represent the information on the range of stability of mullite, including some showing that mullite extends to higher SiO2 contents than represented by the composition of 3:2 mullite. An attempt was made to model the liquid with the ionic two-sublattice model using a new species AIO(2)(-1). The pressure dependence of AI(2)SiO(5) polymorphs was optimized by a new model recently implemented in Thermo-Cale.

  • 11. Pavlyuchkov, D.
    et al.
    Dilner, David
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
    Savinykh, G.
    Fabrichnaya, O.
    Gauckler, L.
    Phase Equilibria in the ZrO2–MgO–MnOx System2016In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 99, no 9, p. 3136-3145Article in journal (Refereed)
    Abstract [en]

    Phase equilibria were experimentally investigated in the MgO–MnOx and the ZrO2–MgO–MnOx systems for different oxygen partial pressures by powder X-ray diffractometry, scanning electron microscopy, and differential thermal analysis. The formation of two compositionally and structurally different β-spinel solid solutions was observed in the MgO–MnOx system in air in the temperature interval 1473–1713 K. Isothermal sections of the ZrO2–MgO–MnOx phase diagram were constructed for air conditions (PO2 = 0.21 bar) at 1913, 1813, 1713, 1613, and 1523 K. In addition, isothermal sections at 1913 and 1523 K were constructed for PO2 = 10−4 bar. The β-spinel and halite phases of the MgO–MnOx system were found to dissolve up to 2 and 5 mol% ZrO2. A continuous c-ZrO2 solid solution forms between the boundary ZrO2–MnOx and ZrO2–MgO systems. It stabilizes in the ZrO2–MgO–MnOx system down to at least 1613 K in air and down to 1506 K at PO2 = 10−4 bar.

  • 12. Ross, A.
    et al.
    Shang, S. -L
    Fang, H.
    Lindwall, Greta
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Liu, X. L.
    Zhao, W.
    Gleeson, B.
    Gao, M. C.
    Liu, Z. -K
    Tailoring critical Al concentration to form external Al2O3 scale on Ni–Al alloys by computational approach2022In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 105, no 12, p. 7770-7777Article in journal (Refereed)
    Abstract [en]

    Nickel (Ni)-based superalloys for high-temperature applications are often designed to form a continuous and slow-growing oxide scale by adding Al and Cr and other beneficial elements. In the present work, the critical Al concentration in Ni–Al alloys needed to establish an α-Al2O3 scale in contrast to internal oxide formation is predicted as a function of temperature by means of the CALPHAD approach coupled with models in the literature, which account for the thermodynamics and kinetics of oxidation. The present thermodynamic remodeling of the Ni–O system results in a better agreement with experimental data of oxygen solubility in Ni at high temperatures. The oxygen solubility is combined with kinetic parameters to determine oxygen permeability in Ni, and the critical Al concentration needed to establish an α-Al2O3 scale at a given exposure temperature. Good agreement is found with available experimental data for both oxygen permeability and critical Al concentration, indicating the capacity of the CALPHAD approach to tailor oxidation resistance for materials of interest using thermodynamic and kinetic knowledge. 

  • 13.
    Sugunan, Abhilash
    et al.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Guduru, Veerendra K.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Uheida, Abdusalam
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Toprak, Muhammet S.
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Muhammed, Mamoun
    KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
    Radially Oriented ZnO Nanowires on Flexible Poly-L-Lactide Nanofibers for Continuous-Flow Photocatalytic Water Purification2010In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 93, no 11, p. 3740-3744Article in journal (Refereed)
    Abstract [en]

    Several oxide ceramics, notably ZnO and TiO2 are known to catalyze decomposition of organic molecules in water under ultraviolet (UV) irradiation. Here we describe fabrication of highly flexible ZnO-based hierarchical nanostructure obtained by growing radially oriented ZnO nanowires on poly-L-lactide nanofibers. Utilizing the flexibility and high surface area of polymeric nanofibers as novel substrate for growth of the photochemically active ZnO nanowires we show a proof-of-principle demonstration of a continuous flow water treatment setup. We have monitored photocatalytic decomposition of known organic pollutants, such as methylene blue, monocrotophos, and diphenylamine under illumination with UV light using this highly flexible hierarchical nanostructure.

  • 14. Vacassy, R.
    et al.
    Scholz, S. M.
    Dutta, Joydeep
    Swiss Fed. Institute of Technology, Switzerland.
    Plummer, C. J. G.
    Houriet, R.
    Hofmann, H.
    Synthesis of controlled spherical zinc sulfide particles by precipitation from homogeneous solutions1998In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 81, no 10, p. 2699-2705Article in journal (Refereed)
    Abstract [en]

    Zinc sulfide (ZnS) powders have been obtained by precipitation from homogeneous solutions of various zinc salt compounds with S 2- as precipitating anion, formed by decomposition of thioacetamide. Spherical particles with a very narrow size distribution can be obtained by controlling; the synthesis parameters. The particle sizes are influenced by the nature of the associated anion. For example nanometer-sized ZnS particles are formed using acetate or acetylacetonate anions under acidic pH conditions, controlled by the addition of acetic acid. Although the nucleation is accelerated by the use of acetic acid, limited particle growth occurs because of the formation of complexes with zinc cations that lowers the concentration of free cations in the solution. Also, the complexing-attachment phenomena of the ZnS particles with acetate and acetylacetonate anions lead to the arrest of particle growth processes. The presence of complexed Zn 2+ species in the acidic solution is demonstrated both theoretically, using a model based on the calculations of the solubility isotherms of the soluble species, and by Fourier-transform infrared techniques. The nanostructured ZnS particles may provide a suable semi-conductor nanocluster material for optoelectronic applications as well as a phosphor suitable for application in flat-panel display technology.

  • 15.
    Wittmer, M.
    et al.
    Brown Boveri Research Centre.
    Boer, C. R.
    Brown Boveri Research Centre.
    Gudmundson, Peter
    Brown Boveri Research Centre.
    Carlsson, J.
    Mechanical properties of liquid-phase-bonded copper-ceramic substrates.1982In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 65, no 3, p. 149-153Article in journal (Refereed)
    Abstract [en]

    Liquid-phase bonding of copper foils to ceramic substrates is a very attractive technique for the fabrication of metallized substrates for hybrid power electronics applications. The design and reliability considerations of such substrates necessitate the knowledge of their mechanical properties. Therefore, stresses and strains in the copper and in the ceramic of bonded substrates were investigated. Theoretical calculations are presented to support the experimental results.

  • 16.
    Xuan, Changji
    et al.
    Additive Manufacturing Division, Sandvik Machining Solutions AB, Sandviken, Sweden.
    Mu, Wangzhong
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    A mechanism theory of dissolution profile of oxide particles in oxide melt2020In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916Article in journal (Refereed)
    Abstract [en]

    The shape origin and variation of oxide dissolution profile in the oxide melt is for the first time explained with a mechanism of diffusion-distance-controlled dissolution (DDD). A novel analytical model is derived to present this theory. The profile shape is governed by the diffusion distance of the dissolved components in the oxide melt. The viscosity gradient at the boundary of the diffusion region provides the driving force for the profile variation. Both temperature and initial viscosity of oxide melt are the key factors determining the oxide dissolution kinetics. This theory can be applied to describe diffusion-limited particle dissolution in a general system.

  • 17.
    Xuan, Changji
    et al.
    Uddeholms AB, Hagfors, Sweden..
    Mu, Wangzhong
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi, Japan..
    A phase-field model for the study of isothermal dissolution behavior of alumina particles into molten silicates2019In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 102, no 11, p. 6480-6497Article in journal (Refereed)
    Abstract [en]

    Particle dissolution process refers to the dissolving of one liquid or solid phase into another solvent phase. This process is of vital importance in the engineering material science, and chemical engineering, etc. Here, we develop a phase-field model with diffusion-controlled processes at interfaces for isothermal dissolution of alumina inclusion particles in molten silicates, referred as "slag," with comprehensive compositions applied in process metallurgy. The interfacial energy between solid inclusion particle and molten silicate can vary with different temperatures and chemical compositions. This model is validated using experimental data of high-temperature confocal laser scanning microscopy (HT-CLSM) technique. Moreover, the developed model is applicable to predict the dissolution behavior of solid particle in a realistic size scale. The possibility of the model application is illustrated with studies of different physical parameters that affect particle dissolution behavior. The phase-field simulations show that inclusion morphology influences both the dissolution profile and time, and the influence decreases with the increased temperature. Increasing same amount of Al2O3 component in slag, the increased degrees of the alumina dissolution time in silicates with different V-ratio values, a ratio between the mass percent of CaO and that of SiO2, are almost the same. If the V-ratio of slag is relatively small, an increased MgO component in the silicate will significantly decrease the particle dissolution time. On the contrary, the change in MgO component in the silicate will have a minor effect if the value of V-ratio is quite large. In order to rapidly dissolve the inclusion, basicity index (BI) of molten silicate should be larger than 1.4. A balance between BI and MgO component in slag is suggested to be considered to design or optimize molten silicate (slag) for its application in the refining process of steel manufacturing.

  • 18. Yu, H.
    et al.
    Jin, Z. P.
    Chen, Q.
    Hillert, Mats
    KTH, Superseded Departments (pre-2005), Materials Science and Engineering.
    Thermodynamic assessment of the lithium-borate system2000In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 83, no 12, p. 3082-3088Article in journal (Refereed)
    Abstract [en]

    The Li2O-B2O3 quasi-binary system is assessed. A two-sublattice ionic solution model, (Li1+)(P)(O2-, BO33-, B4O72-, B3O4.5)(Q), is adopted to describe the liquid phase, All solid phases are treated as stoichiometric compounds. A set of parameters consistent with most of the available experimental data on phase diagram and thermodynamic properties is obtained by using the CALPHAD technique.

  • 19. Zhang, R.
    et al.
    Mao, Huahai
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Thermo-Calc Software AB, Sweden.
    Taskinen, P.
    Phase equilibria study and thermodynamic description of the BaO-CaO-Al2O3 system2017In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 100, no 6, p. 2722-2731Article in journal (Refereed)
    Abstract [en]

    A combined experimental investigation and thermodynamic assessment was performed for the BaO-CaO-Al2O3 system. By using a high-temperature equilibration/quenching technique and scanning electron microscopy, electron probe microanalysis, and X-ray powder diffraction analysis, the phase equilibria at 1500°C and phase stability of BaCa2Al8O15 phase were determined. An extensive literature survey was conducted for the experimental and thermodynamic modeling data of the BaO-CaO-Al2O3 system. According to the literature data and the present measurements, a thermodynamic assessment was made in order to obtain a set of self-consistent thermodynamic parameters to describe the BaO-CaO-Al2O3 system. Based on the thermodynamic parameters acquired in this work, isothermal sections at 1100°C, 1250°C, 1400°C, 1475°C, and 1500°C and the BaO·Al2O3-CaO·Al2O3 and BaO·6Al2O3-CaO·6Al2O3 joints were calculated and compared with the available experimental data.

  • 20. Zhou, L. J.
    et al.
    Rixecker, G.
    Aldinger, F.
    Zhao, Zhe
    Department of Physical Inorganic and Structural Chemistry, Stockholm University.
    Electric fatigue in ferroelectric lead zirconate stannate titanate ceramics prepared by spark plasma sintering2006In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 89, no 12, p. 3868-3870Article in journal (Refereed)
    Abstract [en]

    Ferroelectric lead zirconate stannate titanate ceramics were prepared by spark plasma sintering (SPS). Compared with its counterpart densified by conventional sintering (CS), the SPS material shows a smaller remanent polarization and maximum strain as well as a higher coercive field. Electric fatigue in both materials was investigated. In contrast to CS samples, the SPS specimens show a lower resistance to bipolar electric cycling, characterized by a faster decrease in remanent polarization and maximum strain at cycle number below 10(6.5) and a subsequent slower reduction of the properties at high cycle numbers up to 10(8).

  • 21. Zhou, L. J.
    et al.
    Rixecker, G.
    Zimmermann, A.
    Aldinger, F.
    Zhao, Zhe
    Department of Physical Inorganic and Structural Chemistry, Stockholm University.
    Nygren, M.
    Electric fatigue in antiferroelectric lead zirconate stannate titanate ceramics prepared by spark plasma sintering2005In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 88, no 10, p. 2952-2954Article in journal (Refereed)
    Abstract [en]

    The fatigue behavior of lead zirconate stannate titanate (PZST) ceramics prepared by spark plasma sintering (SPS) was investigated. Polarization and strain hysteresis loops were monitored. The material shows a high resistance to fatigue because of bipolar electric cycling. Both maximum strain and switchable polarization first show a fatigue stage 0 to 10(5) cycles and then a fatigue-free period up to 10(8) cycles. The maximum losses of maximum strain and switchable polarization are 18% and 10% of their initial values, respectively. The dominant fatigue mechanism is assigned to the pinning of domain walls by charged defects.

  • 22. Zhou, L. J.
    et al.
    Zhao, Zhe
    Department of Physical Inorganic and Structural Chemistry, Stockholm University.
    Zimmermann, A.
    Aldinger, F.
    Nygren, M.
    Preparation and properties of lead zirconate stannate titanate sintered by spark plasma sintering2004In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 87, no 4, p. 606-611Article in journal (Refereed)
    Abstract [en]

    Lanthanum-doped lead zirconate stannate titanate ceramics were successfully compacted to full density by spark plasma sintering (SPS). SPS samples densified at 900degrees or 950degreesC exhibit nearly full density and fine grain size (about 300 nm). Compared with samples from conventional sintering (CS), SPS samples show larger permittivity accompanied by a deterioration in dielectric loss and special strain hysteresis loops similar to those of ferroelectric relaxors, with a diffuse AFE-FE phase transition and less field-induced longitudinal strain. The differences in the properties of SPS and CS materials are attributed to the variations of the resultant microstructures, especially the grain size, of the ceramics.

1 - 22 of 22
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf