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Reactions Invariantes Induisant La Densification Des Varistances ZnO

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Abstract

The electrical properties of ZnO varistors are induced by a sintering step. The phenomena occurring during this thermal treatment have been studied through model systems whose nature and composition are well defined. The pure BiSbO4 and Bi3 Zn2 Sb3 O14 phases have been synthetised by Direct Oxidation of a Precursory Alloy (DOPA) and characterized using XRD method. Each one of these phases can react with zinc monoxide through an invariant isobaric reaction in the ZnO–Bi2 O3 –Sb2 O3 system:

– at 998°C 17/3<ZnO>+2/3<Bi3 Zn2 Sb3 O14 > arrow <Zn7 Sb2 O12 > + ((Bi2 O3 ))

– at 1058°C 7<ZnO>+2<BiSbO4 > arrow <Zn7 Sb2 O12 >+((Bi2 O3 ))

These thermodynamic considerations can explain the thermal domain of the sintering reaction described in the literature.

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Authors and Affiliations

  1. Laboratoire d'Energétique et Synthèse Inorganique, ESA CNRS 5079, 43, bd du 11 Novembre 1918, F-69622, Villeurbanne Cedex, France

    N. Achard, J. J. Counioux & A. Marchand

  2. Sté Ferraz, rue Vaucanson, F-69720, St Bonnet de Mure, France

    G. Marichy

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  1. N. Achard
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  2. J. J. Counioux
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  3. G. Marichy
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  4. A. Marchand
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Achard, N., Counioux, J.J., Marichy, G. et al. Reactions Invariantes Induisant La Densification Des Varistances ZnO. Journal of Thermal Analysis and Calorimetry 59, 927–934 (2000). https://doi.org/10.1023/A:1010134611216

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  • DOI: https://doi.org/10.1023/A:1010134611216

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