標題: Effects of A/B cation ratio on the microstructure and lifetime of (Ba1-xCax)(z)(Ti0.99-y ZryMn0.01)O-3 (BCTZM) sintered in reducing atmosphere
作者: Lee, WH
Tseng, TY
Hennings, D
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
公開日期: 1-Mar-2000
摘要: Microstructure and dielectric properties of (Ba1-xCax)(z)(Ti0.99-yZry Mn-0.01)O-3 (BCTZM) with various cation ratios (A/B) sintered in reducing atmosphere and then annealed to reoxidize the ceramic bodies were investigated. With decreasing A/B cation ratio, concurrent with the grain size reduction, the insulation resistance and lifetime of the BCTZM are both increased. The degradation of insulation resistance is closely related to oxygen partial pressure used during annealing and the resulting microstructure of the ceramics. Within the same volume, the specimen with fine grain size provides more grain boundaries, in comparison to large grain size specimens, which helps in providing an efficient diffusion pathway for oxygen during annealing. The result of oxidation of the Mn, that is, a change in the valence state of Mn from Mn+2 to Mn+3 is confirmed from thermogravimetric analysis and electron paramagnetic resonance analysis.
URI: http://dx.doi.org/10.1023/A:1008985616585
http://hdl.handle.net/11536/30718
ISSN: 0957-4522
DOI: 10.1023/A:1008985616585
期刊: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume: 11
Issue: 2
起始頁: 157
結束頁: 162
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