NTCR Effect of BaTiO3-based PTC Ceramics Penetrated by Rare Earth

Abstract

Abstract:

The modified BaTiO₃-based PTC ceramics were prepared by gaseous penetration of rare earth La, and the change laws of the resistivity at room temperature and the temperature- resistivity properties were studied. The experimental results show that the modified BaTiO₃ -based PTC ceramics after La penetration have a significant decrease in resistivity at room temperature, which decreases from 2.7×109 to 220 Ω·m, and the resistivity decreases progressively from 220 to 5.8 Ω·m in the temperatures range from 25 ℃ to 500 ℃, which indicates a significant NTCR effect. Through analyses of XRD, SEM, EDAX and the dielectric properties of the BaTiO₃-based PTC ceramics penetrated by La, the forming mechanism of the NTCR effect was explored, and the physical structure model of the NTCR effect was established.

Key words: Rare earth; Gaseous penetration; NTCR effect; BaTiO₃ ceramics, Rare earth, Gaseous penetration, NTCR effect, BaTiO₃ ceramics

CLC Number:

O614

TrendMD:

HAO Su-E, SUN Liang, HUANG Jin-Xiang, WEI Yong-De. NTCR Effect of BaTiO₃-based PTC Ceramics Penetrated by Rare Earth[J]. Chem. J. Chinese Universities, 2005, 26(12): 2207.

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NTCR Effect of BaTiO₃-based PTC Ceramics Penetrated by Rare Earth

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