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Positive temperature coefficient of resistivity effect in Pb-doped KnbO3

Published online by Cambridge University Press:  31 January 2011

Irena Pribošič ,
Darko Makovec  and
Miha Drofenik
Irena Pribošič
Affiliation:
Jožef Stefan Institute, Jamova 39, Ljubljana, Slovenia
Darko Makovec
Affiliation:
Jožef Stefan Institute, Jamova 39, Ljubljana, Slovenia
Miha Drofenik
Affiliation:
Jožef Stefan Institut, Jamova 39, Ljubljana, Slovenia, and Faculty for Chemistry and Chemical Engineering, University of Maribor, Slovenia
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Abstract

KnbO3 is a ferroelectric material with a Curie temperature (TC) at 415°C, thus giving it the potential to be a material for high-temperature positive temperature coefficient of resistivity (PTCR) applications. In this study, we investigated the PTCR effect in donor-doped KnbO3 ceramics containing 0, 0.1, 0.2, and 0.3 mol% PbO. The donor-doped KnbO3 ceramics exhibited a PTCR anomaly with a relatively low room-temperature resistivity. The temperature of the tetragonal-to-cubic phase transition (TC) of the KnbO3 decreased with the amount of added PbO, while the orthorhombic-to-tetragonal phase transition (TOT) remained unchanged.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 2989 - 2992
Copyright
Copyright © Materials Research Society 2002

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