Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 59: Issue 3
Reactions Invariantes Induisant La Densification Des Varistances ZnO
Authors:
N. Achard Laboratoire d'Energétique et Synthèse Inorganique, ESA CNRS 5079, 43, bd du 11 Novembre 1918 F-69622 Villeurbanne Cedex France F-69622 Villeurbanne Cedex France

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

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G. Marichy Sté Ferraz rue Vaucanson F-69720 St Bonnet de Mure France rue Vaucanson F-69720 St Bonnet de Mure France

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

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Pages:
927–934
Online Publication Date:
02 Nov 2004
Publication Date:
01 Mar 2000
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010134611216
Keywords:
binary and ternary oxides; DOPA; sintering reaction; ZnO varistors
Restricted access

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 998C 17/3<ZnO>+2/3<Bi3 Zn2 Sb3 O14 > arrow <Zn7 Sb2 O12 > + ((Bi2 O3 )) – at 1058C 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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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