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Phase Equilibria in the ZrO2–MgO–MnOx System
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.
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2016 (English)In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 99, no 9, p. 3136-3145Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Blackwell Publishing, 2016. Vol. 99, no 9, p. 3136-3145
Keywords [en]
magnesium oxide, manganese/manganese compounds, phase diagrams, spinels, zirconia, Differential thermal analysis, Isotherms, Magnesia, Manganese compounds, Manganese oxide, Scanning electron microscopy, Solid solutions, Thermoanalysis, X ray diffraction analysis, Zirconium alloys, Diffractometry, Isothermal sections, Oxygen partial pressure, Powder x-rays, Spinel solid solutions, Temperature intervals, Phase equilibria
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Engineering and Technology
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URN: urn:nbn:se:kth:diva-194881DOI: 10.1111/jace.14327ISI: 000387218000038Scopus ID: 2-s2.0-84971370431OAI: oai:DiVA.org:kth-194881DiVA, id: diva2:1055857
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QC 20161213

Available from: 2016-12-13 Created: 2016-11-01 Last updated: 2017-11-29Bibliographically approved

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Dilner, David

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