Gas-sensing property and mechanism of CaxLa1-xFeO3 ceramics

被引：113

作者：

Kong, LB ^{[1
]}

Shen, YS ^{[1
]}

机构：

[1] UNIV SCI & TECHNOL CHINA,DEPT MAT SCI & ENGN,HEFEI 230026,PEOPLES R CHINA

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1996年 / 30卷 / 03期

关键词：

ceramics; gas sensors; alcohol sensors;

D O I：

10.1016/0925-4005(96)80052-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

LaFeO3 and CaxLa1-xFeO3 ceramic powders have been prepared by the coprecipitation method from La(NO3)(3), Fe(NO3)(3) and Ca(NO3)(2) aqueous solutions. The orthorhombic perovskite phases of LaFeO3 and CaxLa1-xFeO3 are characterized by X-ray diffraction patterns. The sensors fabricated with those powders have high sensitivity to alcohol. Partial substitution of La3+ in LaFeO3 with Ca2+ can enhance the sensitivity of the materials to reducing gases. The resistance of an LaFeO3 sensor in air, vacuum and alcohol-containing air has been measured. Complex impedance spectroscopy has been used to try and analyse the gas-sensing mechanism. According to the experimental results, it can be deduced that the surface adsorptive oxygen and lattice oxygen govern the sensing properties of LaFeO3 and CaxLa1-xFeO3 ceramics.

引用

页码：217 / 221

页数：5

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