Oxygen losses and electrical conductivity of SrTi1-yNbyO3+δ materials

被引：11

作者：

Ferreira, AAL

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, P-4901 Viana Do Castelo, Portugal

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 1999年 / 19卷 / 6-7期

关键词：

coulometric titration; electrical properties; titanates;

D O I：

10.1016/S0955-2219(98)00310-0

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：

Porous samples were used to evaluate the changes in electrical conductivity of SrTi1-yNbyO3-delta materials with the oxygen pal tial pressure, this is needed to avoid slow responses to changes in the atmosphere. The power law dependence on the oxygen partial-pressure corresponds to a predominant n-type conductivity. Deviations in strongly reducing conditions were interpreted on assuming that the charge imbalance caused by niobium additions may change with the working conditions. This defect chemistry model was confirmed by varying the oxygen partial pressure in the atmosphere. A coulometric titration technique was used to evaluate the changes in oxygen stoichiometry. (C) 1999 Elsevier Science Limited. All rights reserved.

引用

页码：773 / 776

页数：4

共 13 条

[1]

ABRANTES JCC, 1997, IONICS, V3, P437

[2]

ABRANTES JCC, IN PRESS SENSORS A B

[3] NON-STOICHIOMETRY IN SRTIO3 [J].