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Artigo enviado por participante Elson Longo.

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Effect of oxidizing and reducing atmospheres on the electrical properties of dense SnO2-based varistors
Ano de Publicação:	2001
Veículo de Publicação:	OURNAL OF THE EUROPEAN CERAMIC SOCIETY 21 (2): 161-167
Nível:	Nível A
Inserida no sistema em:	28/07/2006
Órgão de Financiamento:	FAPESP, CNPq, PRONEX e CAPES
Palavras Chave:	ZINC-OXIDE CERAMICS; ZNO VARISTORS; NONOHMIC PROPERTIES; GRAIN-BOUNDARIES; MODEL; TIO2; MECHANISM; SYSTEM
Resumo:	The SnO2 based varistor systems recently presented in the literature appear to have a promising potential in commercial applications. Experimental evidence shows that there is a dependence of nonlinear constant values with thermal treatment under different atmospheres. Thermal treatments in oxygen and nitrogen rich atmospheres at 900 degreesC prove this dependence, indicating that the nonlinear constant values are significantly lower when the material is submitted to a nitrogen atmosphere. Moreover, electrical properties can be restored when the varistor is subjected to thermal treatment at the same temperature in an oxygen atmosphere, indicating that the mechanism seems to be reversible. This paper discusses this behavior focusing in the grain boundary region. Ta2O5 mol% concentrations are also analyzed and the results indicate an optimum Ta2O5 concentration of 0.05 mol% for the electrical properties (alpha = 44 and E-B = 6150 V cm(-1)). (C) 2001 Elsevier Science Ltd. All rights reserved.

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