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The influence of sintering process and atmosphere on the non-ohmic properties of SnO2 based varistor

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Abstract

The non-ohmic properties of the 98.95% SnO2 + 1.0%,CoO + 0.05%,Nb2O5 (all in mole%) system, as well as the influence of sintering temperature and atmosphere on these properties, were characterized in this study. The maximum non-linear coefficient (α = 32) was obtained for a sintering temperature of 1300°C in an oxygen atmosphere and this maximum is associated with the presence of O in SnO2 grain boundaries, as interface defects. Experimental results also indicate thermionic-type conduction mechanisms, which are associated with the potential barrier of Schottky or Poole–Frenkel types.

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Authors and Affiliations

  1. Departamento de Quı´mica, Universidade Federal de Sa~o Carlos, P.O. Box 676, 13560, Sa~o Carlos, SP, Brasil

    E. R. Leite, A. M. Nascimento, P. R. Bueno & E. Longo

  2. Instituto de Quı´mica, Universidade Estadual Paulista, P.O. Box 355, 14800, Araraquara, SP, Brasil

    J. A. Varela

Authors
  1. E. R. Leite
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  2. A. M. Nascimento
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  3. P. R. Bueno
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  4. E. Longo
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  5. J. A. Varela
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Leite, E.R., Nascimento, A.M., Bueno, P.R. et al. The influence of sintering process and atmosphere on the non-ohmic properties of SnO2 based varistor. Journal of Materials Science: Materials in Electronics 10, 321–327 (1999). https://doi.org/10.1023/A:1008933004042

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