Effect of Heat Treatment on Electrical Properties of Zinc Oxides

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  • ZnOセラミックスの電気的特性に及ぼす熱処理効果
  • ZnO セラミックス ノ デンキテキ トクセイ ニ オヨボス ネツ ショリ コ

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The electrical properties of ZnO ceramics were studied from their voltage-current characteristics, thermally stimulated current (TSC), and heat-treatment effects.<br>ZnO ceramic samples with a few mol% of insulating oxide components were prepared. After sintering at 1, 200°C in air, some of them were heat-treated at various temperatures between 450°C and 900°C in air.<br>In the voltage-current curves, the current varies as a function of applied DC voltage, according to the relation; I=kVa, where α is the nonlinear exponent. The nonlinear exponent α decreased with the heat-treatment temperature in the low temperature resion, and it became the lowest around 600-750°C. But they almost recovered at 900°C.<br>Three TSC peaks (designated by P1, P2 and P3 from low temperature side) were observed in the nonheat-treated sample. The sample heat-treated at 600°C and 750°C showed only the P1 and P2 peaks, the P3 peak increased in magnitude with the increase of the biasing temperature Tb, and it shifted toward high temperature side.<br>These results suggest that the electrical properties of ZnO ceramics will be associated with the phase transition of the Bi2O3-rich intergranular by heat-treatment.

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