Unfolding grain size effects in barium titanate ferroelectric ceramics

被引：311

作者：

Tan, Yongqiang ^{[1
,4
]}

Zhang, Jialiang ^{[1
]}

Wu, Yanqing ^{[1
]}

Wang, Chunlei ^{[1
]}

Koval, Vladimir ^{[2
]}

Shi, Baogui ^{[3
]}

Ye, Haitao ^{[3
]}

McKinnon, Ruth ^{[4
]}

Viola, Giuseppe ^{[4
,5
]}

Yan, Haixue ^{[4
]}

机构：

[1] Shandong Univ, State Key Lab Crystal Mat, Sch Phys, Jinan 250100, Peoples R China

[2] Slovak Acad Sci, Inst Mat Res, Kosice 04001, Slovakia

[3] Aston Univ, Sch Engn & Appl Sci, Birmingham B4 7ET, W Midlands, England

[4] Queen Mary Univ London, Sch Engn & Mat Sci, London E1 4NS, England

[5] Inst Mat Phys & Engn, Dept Appl Sci & Technol, I-10129 Turin, Italy

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

基金：

中国国家自然科学基金;

关键词：

PIEZOELECTRIC PROPERTIES; DIELECTRIC-PROPERTIES; DOMAIN-STRUCTURE; BATIO3; CERAMICS; PERMITTIVITY; DEPENDENCE; CONSTANT; STRESS; STRAIN; LIMITS;

D O I：

10.1038/srep09953

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 1 mm and can be attributed to a maximum domain wall density and mobility. The piezoelectric coefficient d(33) and remnant polarization P-r 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.

引用

页数：9