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Fabrication of Lead-Free and High Tc Positive Temperature Coefficient of Resistivity Ceramics Sintered in Air

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Abstract:

As a lead-free positive temperature coefficient of resistivity (PTCR) material, [Ba0.95-x (K0.5Bi0.5)0.05Cax]1-yNbyO3 system was prepared by the conventional solid-state reaction method. All samples sintered in air at 1300°C possess PTC characteristics as well as semi-conductivity characteristics, especially they show high Tc(130°C~160°C) value and the jump of the resistivity (maximum resistivity ρmax / minimum resistivity ρmin ) is four orders of magnitude. Samples with the composition of 0.3mol% Nb5+ have low room-temperature resistivity (ρ25°C) of ~103Ω.cm.

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Advanced Materials, ICAMMP 2011 View Preview

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Periodical:

Advanced Materials Research (Volumes 415-417)

Pages:

1005-1008

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.415-417.1005

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Online since:

December 2011

Authors:

Jun Zhao, Hai Bo Yang, Shu Ping Gong, Dong Xiang Zhou

Keywords:

BaTiO3, K0.5Bi0.5TiO3, Lead-Free, PTC, Thermistor

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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