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Leach, Colin
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article
Fabrication and positive temperature coefficient of resistivity properties of semiconducting ceramics based on the BaTiO3-(Bi1/2K1/2)TiO3 system
Abstract
BaTiO3-(Bi1/2K1/2)TiO3 (BT-BKT) ceramics have a low ρRT of 101-102 Ω cm like that of semiconducting materials prepared by sintering in a N2 flow with low O2 concentration. By annealing in air, the BT-BKT ceramics show an abrupt increase in their resistivity near the Tc, namely, a positive temperature coefficient of resistivity (PTC) characteristic. With 5 mol% and 10 mol% BKT added to BT, the ceramics display the PTC characteristic at 155 °C and 165 °C, respectively. Furthermore, the ratio, ρmax/ρRT, of the highest resistivity (ρmax) and the resistivity at room temperature (ρRT) of the ceramics increased on adding a small amount of Mn and a sintering aid. © 2009 Elsevier Ltd. All rights reserved.