Improving the Characteristics of Ba2Ti9O20 Materials by Using Pre-reacted Ba-Ti-O Compounds
The effect of starting materials Ba-Ti-O compound mixture, 2BaTiO3+7TiO2 (type A) or BaTi4O9+BaTi5O11 (type B), on the characteristics of the Ba2Ti9O20 materials was investigated. Both materials can be sintered to the same high density (>96％ T. D.) with the same large dieffectric constant (K=35～38). While the microwave dieffectric constant (K) of the materials are not sensitive to detailed microstructure of the samples, the Q×f-value of the materials correlates with the microstructure of the samples closely and therefore varies appreciably with the processing details. Comparing with the two-step densification processes, the one-step densification processes improved pronouncedly the characteristics of the type B materials, but degraded markedly those of the type A materials. The possible explanation for such a phenomenon is that direct sintering of type A mixture requires complicated reaction steps to form the Hollandite-like phase and thus leads to non-uniformed microstructure, which results in inferior microwave properties.
I-Nan Lin Chi-Ben Chang Keh-Chyang Leou
Department of Physics, Tamkang University, Tamsui 251, Taiwan, China Department of Engineering and System Science, Tsing-Hua University, Hsinchu, Taiwan 300, China
国际会议
Progress in Electromagnetics Research Symposium 2007(2007年电磁学研究新进展学术研讨会)(PIERS 2007)
北京
英文
597-601
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）