Behavior of strontium titanate ceramics in reducing conditions suggesting enhanced conductivity along grain contacts

被引:15
作者
Abrantes, JCC
Labrincha, JA
Frade, JR [1 ]
机构
[1] Univ Aveiro, Ceram & Glass Engn Dept UIMC, P-3810 Aveiro, Portugal
[2] ESTG, Inst Politecn Viana Castelo, P-4900 Viana Do Castelo, Portugal
关键词
electrical conductivity; grain boundaries; SrTiO3;
D O I
10.1016/S0955-2219(01)00466-6
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
In reducing conditions the resistance of dense strontium titanate ceramic samples decreases markedly with decreasing average grain size. This trend is interpreted on assuming enhanced conductivity along grain contacts in parallel with a RC bulk term. The temperature dependence is consistent with this model and indicates that the bulk may still control the overall behavior at sufficiently high temperatures (typically for T> 700 degreesC). The resistivity of fine grained porous samples is intermediate between the results obtained for fine grained dense samples and dense samples with large average grain size. An extended model is thus proposed to describe the behavior of porous samples by assuming a series association of isolated channels connected by the interior of adjacent grains. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1683 / 1691
页数:9
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