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WANG Fadong, ZHAO Hongfeng, XIE Qingyun. Influence of In2O3 Doping Amount on Electrical Properties of Sb-based SnO2 Varistors[J]. Materials and Mechanical Engineering, 2023, 47(6): 25-29,66. DOI: 10.11973/jxgccl202306005
Citation: WANG Fadong, ZHAO Hongfeng, XIE Qingyun. Influence of In2O3 Doping Amount on Electrical Properties of Sb-based SnO2 Varistors[J]. Materials and Mechanical Engineering, 2023, 47(6): 25-29,66. DOI: 10.11973/jxgccl202306005

Influence of In2O3 Doping Amount on Electrical Properties of Sb-based SnO2 Varistors

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  • Received Date: March 31, 2022
  • Revised Date: March 14, 2023
  • (98.85-x)SnO2-1CoO-0.05Cr2O3-0.1Sb2O5-xIn2O3 (x=0, 0.05, 0.10, 0.15, mole fraction/%) Sb-based SnO2 varistors were prepared by sintering SnO2 powder, CoO powder, Cr2O3 powder, Sb2O5 powder and In2O3 powder at a pressure of 100 MPa and a temperature of 1 300 ℃. The effect of In2O3 doping amount on the microstructure and electrical properties of varistors was studied. The results show that with increasing In2O3 doping amount, the average grain size of Sb-based SnO2 varistors decreased, the density increased first and then decreased, the nonlinear coefficient, applied density, interfacial state density and barrier height all increased first and then decreased, the leakage current density decreased first and then increased, and the voltage gradient increased. When the mole fraction of doped In2O3 was 0.10%, the varistor had the largest density of 6.82 g·cm-3 and the excellent electrical properties with voltage gradient, nonlinear coefficient, leakage current density, applied density, interfacial state density and barrier height of 851 V·mm-1,32.36,1.19 μA·cm-2,4.4×1023 m-3,3.2×1016 m-2 and 1.44 eV, respectively.
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