Unfolding grain size effects in barium titanate ferroelectric ceramics

Tan, Yongqiang, Zhang, Jialiang, Wu, Yanqing, Wang, Chunlei, Koval, Vladimir, Shi, Baogui, Ye, Haitao, McKinnon, Ruth, Viola, Giuseppe and Yan, Haixue (2015). Unfolding grain size effects in barium titanate ferroelectric ceramics. Scientific Reports, 5 ,

Abstract

Grain size effects on the physical properties of polycrystalline ferroelectrics have been extensively studied for decades; however there are still major controversies regarding the dependence of the piezoelectric and ferroelectric properties on the grain size. Dense BaTiO3 ceramics with different grain sizes were fabricated by either conventional sintering or spark plasma sintering using micro- and nano-sized powders. The results show that the grain size effect on the dielectric permittivity is nearly independent of the sintering method and starting powder used. A peak in the permittivity is observed in all the ceramics with a grain size near 1μm and can be attributed to a maximum domain wall density and mobility. The piezoelectric coefficient d33 and remnant polarization Pr show diverse grain size effects depending on the particle size of the starting powder and sintering temperature. This suggests that besides domain wall density, other factors such as back fields and point defects, which influence the domain wall mobility, could be responsible for the different grain size dependence observed in the dielectric and piezoelectric/ferroelectric properties. In cases where point defects are not the dominant contributor, the piezoelectric constant d33 and the remnant polarization Pr increase with increasing grain size.

Publication DOI: https://doi.org/10.1038/srep09953
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Uncontrolled Keywords: General
Full Text Link: http://www.natu ... /srep09953.html
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2015-05-07
Authors: Tan, Yongqiang
Zhang, Jialiang
Wu, Yanqing
Wang, Chunlei
Koval, Vladimir
Shi, Baogui
Ye, Haitao ( 0000-0002-4005-4922)
McKinnon, Ruth
Viola, Giuseppe
Yan, Haixue

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