Grain-Boundary Chemistry of BaTiO3 based PTCR Ceramics as CO Gas Sensors

Abstract

Abstract: The sensing phenomena and mechanism of doped BaTiO₃ based PTCR ceramics for chemical sensors are close related to the variation of chemical defect structure in the grain boundaries with
environmental atmospheres. The surfaces and grain boundaries are act as a uniform source and sink for vacancies, and the lattice defects play a positive role for the sensing effect in the ceramics.
The grain boundary chemistry, specially, formation and distribution of defects, defect changes in adsorption and desorption process with surrounding CO gas, redistribution of electrons on quenching
to room temperature for high dopant concentrations as well as potential barrier in grain boundary were discussed.

Key words: BaTiO₃ PTCR ceramics, grain boundary, defect, CO gas sensor

CLC Number:

TN304

ZHOU Zhi-Gang,TANG Zi-Long,ZHANG Zhong-Tai. Grain-Boundary Chemistry of BaTiO₃ based PTCR Ceramics as CO Gas Sensors[J]. Journal of Inorganic Materials.

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Grain-Boundary Chemistry of BaTiO₃ based PTCR Ceramics as CO Gas Sensors

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