標題: Effect of zirconia content on electrical conductivities of mullite/zirconia composites measured by impedance spectroscopy
作者: Ko, Hong-Da
Lin, Chien-Cheng
Chin, Kuo-Chuang
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-八月-2008
摘要: Electrical conductivities of various mullite/zirconia composites, as well as monolithic mullite and zirconia, were measured using AC impedance spectroscopy from 100 Hz to 10 MHz at temperatures ranging from 150 to 1300 degrees C. The impedance spectra of monolithic zirconia and mullite/zirconia composites showed two semicircles because of the contributions from grains and grain boundaries, while those of monolithic mullite had one semicircle due to the predominant contribution from grains. This indicates that the conductivities of the mullite/zirconia composites increased with zirconia content. The activation energies of electrical conduction in mullite and zirconia were about 65 and 79 kJ/mol, respectively, and those of mullite/zirconia composites were between 65 and 79 kJ/mol. While the conductivities of various composites at I MHz were fitted by Lichtenecker's rule, the general mixing equation could be applied to the conductivities measured at 1 kHz.
URI: http://dx.doi.org/10.1557/jmr.2008.0263
http://hdl.handle.net/11536/8548
ISSN: 0884-2914
DOI: 10.1557/jmr.2008.0263
期刊: JOURNAL OF MATERIALS RESEARCH
Volume: 23
Issue: 8
起始頁: 2125
結束頁: 2132
顯示於類別:期刊論文


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  1. 000258240900012.pdf