Effect of La-doping on the properties of CaCu3Ti4O12 dielectric ceramics

被引：56

作者：

Jin, Shuhua ^{[1
,2
]}

Xia, Haiping ^{[1
]}

Zhang, Yuepin ^{[1
]}

机构：

[1] Ningbo Univ, Lab Photoelect Mat, Ningbo 315211, Zhejiang, Peoples R China

[2] Ningo Univ Technol, Ningbo 315016, Zhejiang, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2009年 / 35卷 / 01期

关键词：

Dielectric properties; CaCu3Ti4O12; Sol-gel method; La(3+)doping; CONSTANT; BATIO3;

D O I：

10.1016/j.ceramint.2007.10.007

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nano-size Ca1-chi La2 chi/3Cu3Ti4O12 (chi = 0.00, 0.05, 0.10, 0.15 and 0.20) precursor powders were prepared via the sol-gel method and the citrate auto-ignition route and then processed into micro-crystal Ca1-chi La2 chi/3Cu3Ti4O12 ceramics under heat treatment. Characterization of the as-obtained ceramics with XRD and SEM showed an average grain sizes of similar to 1-2 mu m, indicating La3+ amount to have little impact on grain size. The room-temperature dielectric constant of the Ca1-chi La2 chi/3Cu3Ti4O12 ceramics sintered at 1000 degrees C was of the order of 10(3)-10(4) despite the variation of chi values. Compared with CaCu3Ti4O12, La3+-doped CaCu3Ti4O12 showed a flatter dielectric constant curve related to frequency. It was found that the loss tangent of the Ca1-chi La2 chi/3Cu3Ti4O12 ceramics was less than 0.20 in similar to 600-10(5) Hz region, which rapidly decreased to a minimum value of 0.03 by La3+ doping with chi = 0.05. Our measurement of the ceramics conductivities (sigma) also indicated that the appropriate introduction of La3+ into CaCu3Ti4O12 would distinctly result in its dielectric properties. (C) 2007 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：309 / 313

页数：5

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