Effect of Heat Treatments on the Wetting Behavior of Bismuth-Rich Intergranular Phases in ZnO:Bi:Co Varistors

The effect of annealing on the wetting behavior of Bi‐rich intergranular phases in ZnO:Bi:Co varistors was studied. The intergranular phase exhibits temperature‐dependent grain‐boundary wetting, with an average equilibrium dihedral angle of 0° at 1140°C and over 55° at 610°C. The temperature‐depende...

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Veröffentlicht in:	Journal of the American Ceramic Society 1989-04, Vol.72 (4), p.642-645
Hauptverfasser:	Gambino, Jeffrey P., Kingery, W. David, Pike, Gordon E., Levinson, Lionel M., Philipp, Herbert R.
Format:	Artikel
Sprache:	eng
Schlagworte:	360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies 360204 - Ceramics, Cermets, & Refractories- Physical Properties ALLOYS Applied sciences bismuth BISMUTH COMPOUNDS BISMUTH OXIDES CHALCOGENIDES cobalt COBALT ADDITIONS COBALT ALLOYS CRYSTAL STRUCTURE DIELECTRIC MATERIALS ELECTRICAL PROPERTIES ELECTRONIC CIRCUITS Electronic equipment and fabrication. Passive components, printed wiring boards, connectics Electronics Exact sciences and technology GRAIN BOUNDARIES heat treatment HEAT TREATMENTS MATERIALS MATERIALS SCIENCE MICROSTRUCTURE OXIDES OXYGEN COMPOUNDS PHASE TRANSFORMATIONS PHYSICAL PROPERTIES SWITCHING CIRCUITS TEMPERATURE DEPENDENCE TEMPERATURE EFFECTS varistors WETTABILITY ZINC COMPOUNDS zinc oxide ZINC OXIDES
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Zusammenfassung:	The effect of annealing on the wetting behavior of Bi‐rich intergranular phases in ZnO:Bi:Co varistors was studied. The intergranular phase exhibits temperature‐dependent grain‐boundary wetting, with an average equilibrium dihedral angle of 0° at 1140°C and over 55° at 610°C. The temperature‐dependent wetting may be related to the temperature dependence of the ZnO concentration in the Bi2O3 liquid phase. The effect of the intergranular phase distribation on the electrical properties of ZnO varistors is discussed.
ISSN:	0002-7820 1551-2916
DOI:	10.1111/j.1151-2916.1989.tb06188.x