New kind of humidity sensitive ceramic with linear property

Author

Yue-Dong, Lu ; Jin-Li, Zhang ; Biao-Rong, Li ; Wu-Yi, Pan

Author_Institution

Dept. of Solid State Electron., Huazhong Univ. of Sci. & Technol., Hubei, China

fYear

1991

fDate

11-16 May 1991

Firstpage

261

Lastpage

263

Abstract

Using the solid phase reaction method, La_1-xSr_xFeO₃ (0⩽x⩽1) ceramic was synthesized in an oxygen structure. Its resistance vs. relative humidity (RH) characteristics as well as the dielectric and complex impedance spectral characteristics were investigated. These results indicate that the resistance of LaFeO₃ decreases with RH, while the resistance of La_1-xSr_xFeO₃ (0.1⩽x⩽0.4) increases with increasing RH, and its sensitivity increases with the increasing x value. The equivalent circuit model of La_1-xSr_xFeO₃ has been established by complex impedance analysis, from which the conclusion can be drawn that the linear positive humidity sensitivity of the material is caused by the change in grain boundary resistance

Keywords

ceramics; electric impedance; electric sensing devices; humidity measurement; lanthanum compounds; materials preparation; mixed conductivity; strontium compounds; La_1-xSr_xFeO₃; complex impedance spectral characteristics; dielectric characteristics; equivalent circuit; grain boundary resistance; humidity sensitive ceramic; linear positive humidity sensitivity; relative humidity; resistance; solid phase reaction method; Atmosphere; Ceramics; Conducting materials; Electric resistance; Electrical resistance measurement; Electrodes; Humidity; Impedance; Powders; Resistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Components and Technology Conference, 1991. Proceedings., 41st

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-0012-2

Type

conf

DOI

10.1109/ECTC.1991.163886

Filename

163886