Analysis on High-temperature-resistant Characteristics of Composite Electroceramics

Abstract

Abstract: The investigations carried out by extensive stability tests on LaCrO₃, NiMn₂O₄ and their compositematerials revealed that the composite materials are greatly superior to single-phase materials in stability.The causes of resistance variation on single phase materials during ageing were analysed applying thedefect chemistry theory. The research suggested that the reduction of oxygen vacancies concentrations,which results from that the absorbed oxygen in the surface and pores of cerandcs diffused gradually intograins, decrease the resistrivity of p-type semiconductor ceramics LaCrO₃ and increases that of n-type semiconductor ceramics NiMn₂O₄. thus it was condluded that the exceedingly good high-temperature-resistant characteristics of composite electroceramics are attributed to the compensation effect of composite materials.

Key words: composite clectroceramics, stability, defect chemistry

LIU Shuying,ZHOU Dongxiang,KANG Jian,TAO Mingde. Analysis on High-temperature-resistant Characteristics of Composite Electroceramics[J]. Journal of Inorganic Materials.

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Analysis on High-temperature-resistant Characteristics of Composite Electroceramics

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