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Low‐voltage varistors based on zinc antimony spinel Zn7Sb2O12

Ezhilvalavan, S and Kutty, TRN (1996) Low‐voltage varistors based on zinc antimony spinel Zn7Sb2O12. In: Applied Physics Letters , 68 (19). pp. 2693-2695.

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Abstract

It is possible to prepare low‐voltage varistors from the zinc antimony spinel Zn7Sb2O12 with breakdown voltages in the range of 3–20 V and nonlinearity coefficient α=7–15. The varistor property is due to the formation of high ohmic potential barriers at the grain boundary regions on low‐ohmic n‐type grain interiors of the polycrystalline samples. The method of preparation of the spinel, synthesized by coprecipitation followed by annealing under restricted partial pressures of oxygen, controls the mixed valence states for antimony, namely, Sb3+ and Sb5+. This is critical in attaining high nonlinearity and lower breakdown voltages.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 23 Dec 2011 07:13
Last Modified: 23 Dec 2011 07:13
URI: http://eprints.iisc.ernet.in/id/eprint/42862

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