Polarons, oxygen vacancies, and hydrogen in BaxSr1-xTiO3

被引：13
|
作者：
Scott, JF [1 ]
Redfern, SAT [1 ]
Zhang, M [1 ]
Dawber, M [1 ]
机构：
[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2001年 / 21卷 / 10-11期
关键词：
optical properties; perovskites; spectroscopy;
D O I：
10.1016/S0955-2219(01)00080-2
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：
The role of hydrogen in strontium titanate and barium strontium titanate is analysed, for both ceramics and single crystals. New infrared and second-harmonic generation (SHG) experiments show the relationship between hydrogen and oxygen vacancies. The infrared data exhibit strong absorption in the 3000-6000 cm(-1) region due to polarons. The SHG data exhibit rather strong signals at room temperature (nominally forbidden). These data are correlated with the temperature dependence of activation enthalpies from Steinsvik (Oslo), and it is found that the latter are characterised by a universal exponent of 7/4 for the dependence upon vacancy concentration, in agreement with the predictions for a cubic lattice in percolation theory. (C) 2001 Elsevier Science Ltd. All rights reserved.
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收藏
页码：1629 / 1632
页数：4
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