The effect of Bi2O3content on the microstructure and electrical properties of ZnO varistor materials

1989 ◽  
Vol 66 (9) ◽  
pp. 4317-4324 ◽  
Author(s):  
E. Olsson ◽  
G. L. Dunlop
Keyword(s):  
Electrical Properties ◽  
Zno Varistor

Tailoring electrical properties of multiple dopant-based ZnO varistor by doping with yttrium, gallium, and indium

2017 ◽  
Vol 209 ◽  
pp. 413-416 ◽  
Author(s):  
Pengfei Meng ◽  
Xiao Yang ◽  
Jun Hu ◽  
Jinliang He
Keyword(s):  
Electrical Properties ◽  
Zno Varistor

Enhanced electrical properties of ZnO varistor ceramics by spark plasma sintering: Role of annealing

2020 ◽  
Vol 46 (10) ◽  
pp. 15076-15083 ◽  
Author(s):  
Jie Liang ◽  
Xuetong Zhao ◽  
Jianjie Sun ◽  
Lulu Ren ◽  
Ruijin Liao ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Spark Plasma Sintering ◽  
Zno Varistor ◽  
Plasma Sintering ◽  
Spark Plasma

Stable electrical properties of ZnO varistor ceramics with multiple additives against the AC accelerated aging process

2019 ◽  
Vol 45 (8) ◽  
pp. 11105-11108 ◽  
Author(s):  
Pengfei Meng ◽  
Xiao Yang ◽  
Jinbo Wu ◽  
Qingyun Xie ◽  
Jimou He ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Aging Process ◽  
Accelerated Aging ◽  
Zno Varistor

Electrical properties of ZnO varistor ceramics modified by rare earth-yttrium and gallium dopants

2018 ◽  
Vol 233 ◽  
pp. 20-23 ◽  
Author(s):  
Pengfei Meng ◽  
Jinbo Wu ◽  
Xiao Yang ◽  
Jun Hu ◽  
Jinliang He
Keyword(s):  
Rare Earth ◽  
Electrical Properties ◽  
Zno Varistor

Study on Microstructure and Electrical Properties of ZnO Varistor Ceramics

2011 ◽  
Vol 415-417 ◽  
pp. 2008-2011 ◽  
Author(s):  
Chang Qi Xia ◽  
Qi Bin Liu ◽  
Mo He
Keyword(s):  
Electrical Properties ◽  
Sintering Temperature ◽  
Spinel Phase ◽  
Voltage Gradient ◽  
X Rays ◽  
Sintering Process ◽  
Varistor Ceramic ◽  
Zno Varistor ◽  
Zno Varistors ◽  
Ceramic Sintering

To obtain ZnO varistors with high voltage gradient, ZnO varistors were fabricated by traditional ceramic sintering technique, which were sintered from 1135 to 1155 °C, the microstructure and properties of varistors were characterized by SEM, X-rays diffraction and DC parameter instrument for varistors. The experimental results show that the spinel phase Zn7Sb2O12 generated during sintering process, very thin amorphous Bi rich films are formed between the ZnO/ZnO grain boundaries, with increasement of sintering temperature, the grain size of ZnO varistor ceramic becomes bigger, the voltage gradient of varistor decreases and the density is improved. The optimized parameters are that when the sintering temperature is at 1140 °C, the voltage gradient of varistor is 301V/mm, the leakage current is 4μA and the density is 96.6%, the comprehensive electrical properties of ZnO varistors reach maximum.

Research on Mechanism of Improving Electrical Properties of ZnO Varistor Ceramics by Laser Shock Processing

2010 ◽  
Vol 37-38 ◽  
pp. 1045-1049 ◽  
Author(s):  
Rui Fang Chen ◽  
Yin Qun Hua ◽  
Guang Ji ◽  
Zhen Zhen Sun
Keyword(s):  
Phase Composition ◽  
Electrical Properties ◽  
Nonlinear Coefficient ◽  
Voltage Gradient ◽  
Laser Shock ◽  
Electrical Parameters ◽  
Laser Shock Processing ◽  
Zno Varistor ◽  
Compound State ◽  
Shock Processing

In order to improve electrical properties, annealed ZnO varistor ceramics have been treated by laser shock processing (LSP). Electrical parameters of the annealed ZnO varistor ceramics were measured by CJ1001 Varistor Tester. Morphology and microstructure of the annealed ZnO varistor ceramics were gained by XRD and SEM. The results indicate that compared with the electrical properties of the annealed ZnO varistor ceramics, the voltage gradient of the ZnO varistor ceramics treated by LSP remains the same, the nonlinear coefficient substantially increases by 31.6%, and the leakage current reduces by 33.3%. Meanwhile, the phase composition of the annealed ZnO varistor ceramics is mainly composed of ZnO main phase, Zn2.33Sb0.67O4, β-Bi2O3, and δ-Bi2O3 phase; while the phase composition of the ZnO varistor ceramics remains the above four phases in the compound state (anneal and then LSP), but the content of δ-Bi2O3 phase increases. The increase of δ-Bi2O3 phase content is the main reason for improving the electrical properties of the annealed ZnO varistor ceramics.

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