The induced phase transformation and oxygen vacancy relaxation in La-modified bismuth titanate ceramics

被引：78

作者：

Jiang, AQ ^{[1
]}

Hu, ZX ^{[1
]}

Zhang, LD ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Hefei 230031, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 1999年 / 74卷 / 01期

关键词：

D O I：

10.1063/1.122968

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Nanopowders of Bi2Ti2O7 with various La modifications were fabricated by chemical coprecipitation. As sintered at high temperature, the phase structure in powders translates into (La0.22Bi0.78)(4)Ti3O12 and (La0.26Bi0.74)(2)Ti4O11 with increasing La concentration, respectively. Dielectric and nonlinear resistivity investigations in bulk ceramics show that oxygen vacancy relaxation or defect dipole polarization contributes considerably to the dielectric permittivity, while the mechanism is shut off under a threshold field dependent on phase transition as well as temperature. Furthermore, the quantitative analysis of x-ray photoelectron spectroscopy indicates the deviation of oxygen element composition at surfaces of (La0.22Bi0.78)(4)Ti3O12 ceramic grains from the standard ratio. (C) 1999 American Institute of Physics. [S0003-6951(99)03001-6].

引用

页码：114 / 116

页数：3

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