タングステンブロンズ型(1-X)Ba_<3.75>Y_<0.83>Nb_<10>O_<30>-X Ba_<3.75>Sm_<0.83>Nb_<10>O_<30>固溶体の結晶構造と強誘電特性

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Solid solutions of (1-X)Ba_<3.75>Y_<0.83>Nb_<10>O_<30>-X Ba_<3.75>Sm_<0.83>Nb_<10>O_<30> were synthesized and examined with regard to their ferroelectric properties. No abnormal changes of lattice parameters were found over the investigated range of solid solution. Hysteresis curve measurement indicated that the polarization property could be improved by employing different rare earth cations. The coercive field (E_c) decreased as the composition approached Ba_<3.75>Sm_<0.83>Nb_<10>O_<30>. The remanent polarization (P_r) of the solid solution was higher than those of end members, and maximum values were observed at X=0.4-0.6. Variation of Curie temperature and cell distortion showed the same tendency as that of E_c. Atomic displacement calculated from refined structural parameters agreed with the abnormal change of P_r. The contribution of larger macroscopic polarization for X=0.4-0.6 region could be apparently attributed to the larger displacement of Nb^<5+> ions.
社団法人日本セラミックス協会の論文
2000-01-01