Title :
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
Abstract :
Using the solid phase reaction method, La1-xSrx FeO3 (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 La1-xSrxFeO3 (0.1⩽x⩽0.4) increases with increasing RH, and its sensitivity increases with the increasing x value. The equivalent circuit model of La1-xSrxFeO3 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; La1-xSrxFeO3; 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;
Conference_Titel :
Electronic Components and Technology Conference, 1991. Proceedings., 41st
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-0012-2
DOI :
10.1109/ECTC.1991.163886
