Dependence of depolarization temperature on cation vacancies and lattice distortion for lead-free 74(Bi1/2Na1/2)TiO3-20.8(Bi1/2K1/2)TiO3-5.2BaTiO3 ferroelectric ceramics

被引：32

作者：

Zhu, Mankang ^{[1
]}

Hu, Hancheng ^{[1
]}

Lei, Na ^{[1
]}

Hou, Yudong ^{[1
]}

Yan, Hui ^{[1
]}

机构：

[1] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 18期

关键词：

barium compounds; bismuth compounds; dielectric depolarisation; ferroelectric ceramics; ferroelectric transitions; permittivity; potassium compounds; sintering; sodium compounds; vacancies (crystal); FREE PIEZOELECTRIC CERAMICS; PHASE-TRANSITION TEMPERATURES; ELECTRICAL-PROPERTIES; DIELECTRIC-PROPERTIES; NONSTOICHIOMETRY;

D O I：

10.1063/1.3130736

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper, the off-morphotropic-phase-boundary 74(Bi1/2Na1/2)TiO3-20.8(Bi1/2K1/2)TiO3-5.2BaTiO(3) ceramics were fabricated at different sintering temperatures. It was found out that as the sintering temperature increases, the volatilization of the A-site elements is aggravated, thus generating the oxygen vacancies; meanwhile, the tetragonality of the perovskite lattice reduces gradually. Besides, the temperature-dependent dielectric responses revealed that as the sintering temperature increases, the depolarization temperature T-d decreases while the Curie-Weiss point T-C increases. It is suggested that the lattice distortion, other than the oxygen vacancies, is the crucial factor in influencing the depolarization temperature.

引用

页数：3

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