Perspectives of phase-transition based sensors and that yttrium-doped BaTiO3 semiconductor with posistor effect

被引：6
|
作者：
Bashkirov, LA [1 ]
Shishkin, NY [1 ]
Kurbachev, OI [1 ]
Chebotar, OA [1 ]
Zharsky, IM [1 ]
机构：
[1] Belarusian State Univ, Minsk, BELARUS
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 1999年 / 55卷 / 01期
关键词：
phase transition; gas sensor; barium titanate; posistor effect;
D O I：
10.1016/S0925-4005(99)00030-1
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The synthesis of Y-doped Ba titanate semiconductor Ba0.998Y0.002TiO3 with posistor effect was carried out on the basis of ceramic technology. The influence on conductivity of the bulk ceramic samples in the region of posistor transition temperature of the reducing gases of CO and H2S was investigated. The unique sensitivity of the material to CO in the concentration range of 0.1-1.5 vol.% at low temperature (108 degrees C) was found. The phenomena is based on the extreme reactivity of ternary grain oxygen atoms at the temperature of phase transition. At the same time the selectivity of the material to CO against H2S and very low sensitivity to H2S was found out. It is suggested posistor ceramics of Ba0.998Y0.002TiO3 to be perspective material for low temperature chemical sensors creation. Also posistor effect as well as phase transition parameters influence of the chemically active gases is a new way in chemical sensors development. (C) 1999 Elsevier Science S.A. All rights reserved.
引用
收藏
页码：65 / 69
页数：5
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