Sr-Bi-Ta-Si-O系強誘電体の結晶構造,強誘電特性の組成,熱処理依存

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We investigated the relation between the crystal structure and ferroelectric properties of Bi_2SiO_5, Bi_4Si_3O_<12> and Bi_2O_3-added Sr_<0.8>Bi_<2.2>Ta_2O_9. Moreover, we investigated that the effect of heat treatment using one of the Bi_4Si_3O_<12> added Sr_<0.8>Bi_<2.2>Ta_2O_9 compounds after a vacuum and high pressure oxygen treatment. The remanent polarization (P_r) increased with the added Bi_4Si_3O_<12> or Bi_2O_3, however, it decreased due to added Bi_2SiO_5. It was considered that the volume of the tetrahedrons, which makes the top of Bi, increased with the addition of Bi_2O_3 in the (Bi_2O_2)^<2+> layer, and the displacement of the atom becomes easy for the applied field due to the pseudo perovskite (SrTa_2O_7)^<2-> received stress. It was noted that the T_c decreased with the decreasing tilting angle (α_b) of the TaO_6 octahedron by heat treatment of the reduced direction.
社団法人日本セラミックス協会の論文
2006-07-01