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Synthesis of varistor powders by accelerated combustion and properties of ceramics based on them

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Abstract

Varistor powders were synthesized by accelerated combustion of an aqueous solution of hydrated zinc, bismuth, aluminum, cobalt, and nickel nitrates, antimony tartrate, and sugar at 500°С with isothermal heating for 10 min, followed by grinding and calcination at 700°С for 1 h. The varistor powders obtained have high specific surface area and allow preparation of a ceramic with high values of the breakdown voltage and nonlinearity coefficients and with low leakage current density. The ceramic of the optimum composition (wt %), ZnO 75, Bi2O3 7.36, Sb2O3 5.1, Al2O3 7.19, Co2O3 4.8, and NiO 0.61, sintered at 975°С for 4 h, has U b = 4.2 kB mm–1, α = 54, and I leak = 0.2 μA cm–2.

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Authors and Affiliations

  1. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Resources, Kola Scientific Center, Russian Academy of Sciences, Apatity, Murmansk oblast, Russia

    O. G. Gromov, E. L. Tikhomirova & Yu. A. Savel’ev

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  1. O. G. Gromov
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  2. E. L. Tikhomirova
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  3. Yu. A. Savel’ev
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Correspondence to E. L. Tikhomirova.

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Original Russian Text © O.G. Gromov, E.L. Tikhomirova, Yu.A. Savel’ev, 2017, published in Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 8, pp. 1062−1065.

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Gromov, O.G., Tikhomirova, E.L. & Savel’ev, Y.A. Synthesis of varistor powders by accelerated combustion and properties of ceramics based on them. Russ J Appl Chem 90, 1293–1295 (2017). https://doi.org/10.1134/S107042721708016X

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  • DOI: https://doi.org/10.1134/S107042721708016X

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