Pb(Li_<1/4>Fe_<1/4>W_<1/2>)O_3を添付したPb(Mg_<1/3>Nb_<2/3>)O_3セラミックスの低温焼結と誘電特性

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The sintering behavior and dielectric characteristics of Pb (Li_<1/4>Fe_<l/4>W_<l/2>) O_3-added Pb (Mg_<l/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_<l/4>Fe_<l/4>W_<l/2>) O_3 acted as a reactive liquid phase to substantially enhance the densification of Pb (Mg_<l/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℃ when the content of Pb (Li_<l/4>Fe_<l/4>W_<l/2>) O_3 was less than 10 mass%, whereas, adding excess Pb (Li_<l/4>Fe_<l/4>W_<1/2>) O_3 unfavorably caused polyhedral pyrochlore phase to form in the matrix. The addition of Pb (Li_<l/4>Fe_<l/4>W_<l/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.
社団法人日本セラミックス協会の論文
1996-07-01