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Ink-jet printed BNT thin films with improved ferroelectric properties via annealing in wet air
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Tianjin University, Tianjin, China.ORCID iD: 0000-0003-3060-9987
2018 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 44, no 9, p. 10700-10707Article in journal (Refereed) Published
Abstract [en]

In this work, an ink-jet printing process based on the sol-gel route was applied to prepare lead-free ferroelectric Na0.5Bi0.5TiO3(BNT) thin films for the first time. Dense and crack-free films with perovskite structure were obtained from a modified precursor solution through multiple printing and pyrolysis processes. The ferroelectric, dielectric and electrical properties were significantly affected by the annealing temperature and atmosphere. The film annealed at 670 °C in wet air showed a high remnant polarization of 24.7 μC/cm2 with a low coercive field of 263 kV/cm, the dielectric constant and loss were 185 and 0.1 at 10 kHz, respectively. It was found that wet air was an alternative to reduce oxygen vacancies and enhance properties of ferroelectric films, which can be explained by the defect chemical reaction between water and oxygen vacancies. X-ray photoelectron spectroscopy(XPS) confirmed the decrease of oxygen vacancies after annealing with water presence, with a formation of Ohmic conduction mechanism dominated by charged hydroxyl groups.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 44, no 9, p. 10700-10707
Keywords [en]
Bismuth sodium titanate, Ferroelectric thin films, Ink-jet printing, Oxygen vacancies
National Category
Ceramics
Identifiers
URN: urn:nbn:se:kth:diva-227542DOI: 10.1016/j.ceramint.2018.03.104Scopus ID: 2-s2.0-85044007827OAI: oai:DiVA.org:kth-227542DiVA, id: diva2:1208865
Note

QC 20180521

Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-05-21Bibliographically approved

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Zhao, Zhe

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