標題: PHASE IDENTIFICATION AND ELECTRICAL-PROPERTIES IN ZNO-GLASS VARISTORS
作者: LEE, YS
TSENG, TY
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: VARISTORS;ZINC OXIDE;GLASS;ELECTRICAL PROPERTIES;PHASES
公開日期: 1-六月-1992
摘要: Ceramic varistors based on ZnO with lead zinc borosilicate glass instead of Bi2O3 Were prepared. The effect of sintering conditions on the electrical properties was studied by sintering samples at various temperatures and cooling them at different rates. The sample sintered at 1250-degrees-C for 1 h, then furnace cooled, possessed the best electrical properties, as characterized by the highest nonlinear coefficient, lowest leakage current, and lowest degradation. The microstructure and crystal structure of the glass phase of ZnO-glass varistors were examined by means of scanning electron microscopy, transmission electron microscopy, and powder X-ray diffractometry. The glass phase was originally amorphous, but crystallized as an intergranular layer in the sintered and furnace-cooled samples. This crystallized phase was a zinc borate phase (5ZnO.2B2O3), which was identified by X-ray diffractometry, transmission electron microscopy, and Auger electron spectroscopy. The zinc borate phase at the grain boundary of ZnO-glass samples enhanced the nonohmic characteristics of the ceramic varistors.
URI: http://dx.doi.org/10.1111/j.1151-2916.1992.tb04236.x
http://hdl.handle.net/11536/3391
ISSN: 0002-7820
DOI: 10.1111/j.1151-2916.1992.tb04236.x
期刊: JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume: 75
Issue: 6
起始頁: 1636
結束頁: 1640
顯示於類別:期刊論文