New lead-free relaxor ceramics derived from BaTiO3 by cationic heterovalent substitutions in the 12 CN crystallographic site

被引：44

作者：

Ravez, J ^{[1
]}

Simon, A ^{[1
]}

机构：

[1] CNRS, Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France

来源：

SOLID STATE SCIENCES | 2000年 / 2卷 / 05期

关键词：

dielectric studies; new lead-free relaxor ceramics; environmental friendly applications;

D O I：

10.1016/S1293-2558(00)01066-9

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Crystallographic and low frequency dielectric studies were performed on new lead-free ceramics derived from BaTiO3 by cationic substitutions in the 12 C.N. crystallographic site and having the composition Ba1-xKx/2Lax/2TiO3 or Ba(1-x)A(2x/3)-TiO3 (A = La, Bi). A classical ferroelectric behaviour was shown for compositions close to BaTiO3, while a relaxer one occurred when the composition deviated from BaTiO3. In any case, the value of T-C (or T-m) and the relaxer characteristics are higher as x increases. Concerning potassium-free ceramics, bismuth compositions compared with lanthanum ones favoured both high ferroelectric and relaxer characteristics due to the lone pair of Bi3+. Such new materials are of interest for environmental friendly applications. (C) 2000 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

引用

页码：525 / 529

页数：5

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