Abstract
The microstructure and electrical properties of MnTa-doped ZnO–V 2O 5-ceramics with sintering was investigated. The microstructure consisted of a primary phase of ZnO grains and minor secondary phases such as Zn 3(VO 4) 2, ZnV 2O 4, and TaVO 5, which act as liquid-phase sintering aids. The sintered density decreased from 5.69 g cm −3 to 5.52 g cm −3 due to the volatility of V 2O 5 in accordance with increasing sintering temperature. The maximum nonlinear coefficient (28) was obtained at 925 °C. The donor concentration increased from 1.07 × 10 18 cm −3 to 3.56 × 10 18 cm −3 in accordance with increasing sintering temperature and the barrier height exhibited the maximum value (1.25 eV) at 950 °C.
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