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In KNbO3 ceramics rendered semiconductive by additions of K2O-GeO2 glasses two PTC anomalies are observed: at the Curie point and in the vicinity of the orthorhombic-tetragonal phase transition. ‘These results are explained on the basis of Heywang-Jonker model of the PTC effect modified to take account of intergranular layers of glassy phase and spontaneous polarization in grains.
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Prokopalo et al. (1984) studied this question.
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