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Composite ceramics with a positive temperature coefficient of electrical resistivity effect

Published online by Cambridge University Press:  31 January 2011

Darja Lisjak ,
Miha Drofenik  and
Drago Kolar
Darja Lisjak
Affiliation:
Institute “Jožef Stefan,” Jamova 39, 1000 Ljubljana, Slovenia
Miha Drofenik
Affiliation:
Institute “Jožef Stefan,” Jamova 39, 1000 Ljubljana, Slovenia
Drago Kolar
Affiliation:
Institute “Jožef Stefan,” Jamova 39, 1000 Ljubljana, Slovenia
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Abstract

Composite ceramics with compositions within the ZnO–NiO–TiO2, ZnO–MgO, and ZnO–Ln2O3 (Ln = Nd, Sm) systems were found to exhibit an anomalous positive temperature coefficient of electrical resistivity (PTCR) effect. The investigations revealed, that in all cases when the PTCR effect was identified, the composite ceramics were found to be composed of phases with different electrical resistivities and linear thermal expansion coefficients. Thermal mismatch between the phases in the composites leads to a disconnection of the grains of the low resistivity constituent phase on account of the high thermal expansion of the other high resistivity constituent phase, resulting in a PTCR effect.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 417 - 428
Copyright
Copyright © Materials Research Society 2000

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