The Positive Temperature Coefficient of Resistivity Effect in (1-x)KNbO3-xBaGeO3 Based Ceramics

Tie Zhu Xu; Xing Wen Zhu; Min Gong; Sheng Wei Wang; Wen Zhong Jiang; Xiao Zhou

doi:10.4028/www.scientific.net/AMR.476-478.1046

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 476-478The Positive Temperature Coefficient of...

The Positive Temperature Coefficient of Resistivity Effect in (1-x)KNbO₃-xBaGeO₃ Based Ceramics

Abstract:

(1-x)KNbO3-xBaGeO3 based PTCR ceramic materials are prepared using high purity K2CO3, Nb2O5, GeO2, Al2O3 and BaCO3 powders as starting materials, and the structural and electrical properties have been investigated. The results indicated that the samples doped with minute Ba as donor show excellent PTCR effect above the temperature of about 36°C. For the 0.40at% Ba-doped sample, the minimum resistance of 4.2×104Ω·cm, temperature coefficient (αk) of 24.37%/°C, PTCR anomaly lg(Rmax/Rmin) of 3.82 and transition temperature (Tmin) of 36°C are obtained.

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Periodical:

Advanced Materials Research (Volumes 476-478)

Pages:

1046-1049

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.476-478.1046

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Online since:

February 2012

Authors:

Tie Zhu Xu, Xing Wen Zhu, Min Gong, Sheng Wei Wang, Wen Zhong Jiang, Xiao Zhou

Keywords:

(1–x)KNbO₃-xBaGeO₃, Lead-Free, Phase Transition Point, PTCR

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