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- Title
Effect of Heat Treatment on Electrical Properties of Zinc Oxides.
- Authors
Kawamura, Hideaki; Yamada, Katsuhisa; Nawata, Masahito; Ieda, Masayuki
- Abstract
The electrical properties of ZnO ceramics were studied from their voltage-current characteristics, thermally stimulated current (TSC), and heat-treatment effects. ZnO ceramic samples with a few mol% of insulating oxide components were prepared. After sintering at 1200°C in air, some of the sample were heat treated at various temperatures between 450 and 900&geg;C in air. On the voltage-current curves, the current varies as a function of applied dc voltage according to the relation I = CVα, where is the nonlinear exponent. The nonlinear exponent a decreased with the heat-treatment temperature in the low-temperature region, became the lowest around 600-750°C, and almost recovered at 900°C. Three TSC peaks (designated by P1 P2 and P3 from the low-temperature side) were observed in the nonheat-treated samples. The samples heat treated at 600 and 750°C showed only the P1 and P2 peaks; the P3 peak increased in magnitude with the increase of biasing temperature tb, and it shifted toward the high-temperature side. These results suggest that the electrical properties of ZnO ceramics will be associated with the phase transition of the Bi2O3-rich intergranular layers by heat treatment.
- Subjects
ZINC oxide; OXIDE ceramics; ELECTRIC currents; HEAT treatment of metals; POWDER metallurgy; VOLTAGE regulators; PHASE transitions; ELECTRICAL engineering
- Publication
Electrical Engineering in Japan, 1992, Vol 112, Issue 3, p10
- ISSN
0424-7760
- Publication type
Article
- DOI
10.1002/eej.4391120302