https://scholars.lib.ntu.edu.tw/handle/123456789/407503
標題: | Role of the addition of Pb(Li 1/4 Fe 1/4 W 1/2 )O 3 in the low-temperature sintering and dielectric characteristics of Pb(Mg 1/3 Nb 2/3 )O 3 ceramics | 作者: | Lu C.-H. Hwang W.-S. |
關鍵字: | Dielectric properties;Microstructure;Pb(Li 1/4 Fe 1/4 W 1/2 )O 3;Pb(Mg 1/3 Nb 2/3 )O 3;Sintering | 公開日期: | 1996 | 卷: | 104 | 期: | 7 | 起(迄)頁: | 587-593 | 來源出版物: | Journal of the Ceramic Society of Japan | 摘要: | The sintering behavior and dielectric characteristics of Pb (Li 1/4 Fe 1/4 W 1/2 )O 3 -added Pb (Mg 1/3 Nb 2/3 )O 3 ceramics were investigated. Mixing the two end-members for 4h only formed a mixture, however, 48h-mixing mechanochemically induced the reactants to form partial perovskite solid-solutions. In the mixture specimen, the melt of Pb (Li 1/4 Fe 1/4 W 1/2 )O 3 acted as a reactive liquid phase to substantially enhance the densification of Pb (Mg 1/3 Nb 2/3 )O 3 , and caused grains to grow greatly and resulted in nonuniform microstructure. Regardless of mixing conditions, pure perovskite solid-solutions were formulated at 1000¢XC when the content of Pb(Li 1/4 Fe 1/4 W 1/2 )O 3 was less than 10 mass%, whereas, adding excess Pb(Li 1/4 Fe 1/4 W 1/2 )O 3 unfavorably caused polyhedral pyrochlore phase to form in the matrix. The addition of Pb(Li 1/4 Fe 1/4 W 1/2 )O 3 decreased the broad maximum of dielectric permittivity of sintered specimens; nevertheless, this addition markedly suppressed the temperature dependence of dielectric permittivity. The ceramics fabricated by the mixture of two end-members possessed a larger apparent diffusiveness of dielectric permittivity than those prepared from the partial solid-solution, implying that a wider compositional fluctuation likely occurred in the former specimen. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407503 | ISSN: | 09145400 |
顯示於: | 化學工程學系 |
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