Screen printed barium strontium titanate films for microwave applications

被引:16
作者
Ditum, CM [1 ]
Button, TW [1 ]
机构
[1] Univ Birmingham, Sch Engn, IRC Mat Proc, Birmingham B15 2TT, W Midlands, England
基金
英国工程与自然科学研究理事会;
关键词
dielectric properties; diffusion; microstructure-final; sintering; (Ba; Sr)TiO3;
D O I
10.1016/S0955-2219(03)00136-5
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
Powders to be used in inks for screen printing of Ba0.5Sr0.5TiO3 thick films have been prepared by two different routes-calcination of BaCO3, SrCO3 and TiO2 by a conventional solid-state reaction, and thorough mixing of uncalcined nano-sized BaTiO3 and SrTiO3. The effect of these two different production routes on the microstructural properties in terms of grain size and density has been assessed using SEM. Electrical measurements at 1 kHz indicate that both permittivity and dielectric loss are affected by the density of the films. Permittivity also appears to be affected by the grain size of the films, which increases dramatically above a particular sintering temperature. The Curie temperature also decreases as sintering temperature increases and this has been linked to observed Ba diffusion from the film into the alumina substrate. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2693 / 2697
页数:5
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