Sintering of zinc oxide doped with antimony oxide and bismuth oxide

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb07659.x· OSTI ID:5374598

Kim, J; Kimura, T; Yamaguchi, T ^[1]

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1. Keio Univ., Yokohama (Japan). Faculty of Science and Technology

The phase change, densification, and microstructure development of ZnO doped with both Bi/sub 2/O/sub 3/ and Sb/sub 2/O/sub 3/ are studied to better understand the sintering behavior of ZnO varistors. The densification behavior is related to the formation of pyrochlore and liquid phases; the densification is retarded by the former and promoted by the latter. The pyrochlore phase, whose composition is Bi/sub 3/2/ZnSb/sub 3/2/O/sub 7/, appears below 700{sup 0}C. The formation temperature of the liquid phase depends on the Sb/Bi ratio: about 750{sup 0}C for Sb/Bi<1 by the eutectic melting in the system ZnO-Bi/sub 2/O/sub 3/, and about 1000{sup 0}C for Sb/Bi>1 by the reaction of the pyrochylore phase with ZnO. Hence, the densification rate is determined virtually by the Sb/Bi ratio and not by the total amount of additives.

• OSTI ID: 5374598
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:8; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
&amp; Refractories-- Preparation &amp; Fabrication
360202 -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
ANTIMONY COMPOUNDS
ANTIMONY OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
CRYSTAL DOPING
CRYSTAL STRUCTURE
EPITAXY
FABRICATION
LIQUID PHASE EPITAXY
MICROSTRUCTURE
MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PYROCHLORE
SINTERING
ZINC COMPOUNDS
ZINC OXIDES