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Varistors based on mixed‐phase ceramics containing ZnO and negative temperature coefficient spinels

Raghu, N and Kutty, TRN (1991) Varistors based on mixed‐phase ceramics containing ZnO and negative temperature coefficient spinels. In: Applied Physics Letters, 58 (10). 1050 -1052.

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Abstract

High nonlinearity coefficients of 60–150 are observed in the current‐voltage (I‐V) curves of the mixed phase ceramics formed by cosintering ZnO with spinel phases having large negative temperature coefficients (NTCs) in resistivity. The region of negative slope in the I‐V curves of the NTC ceramics is progressively made positive with ZnO phase content, wherein ZnO grains function as a built‐in resistor in series to the resistance of the NTC phase. High α depends on the optimum phase content of ZnO as much as its intrinsic conductivity. The studies indicate that the predominent contribution to power dissipation is by way of joule heating from the resistive component of the current.

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: 07 Dec 2010 06:30
Last Modified: 07 Dec 2010 06:30
URI: http://eprints.iisc.ernet.in/id/eprint/34354

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