JIS YB Lead Complex Perovskite Ferroelectric Material

概要

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Excess WO_3 and higher sintering temperature were used for decreasing the temperature dependence of the dielectric constant in Pb(Mg_<1/3>Nb_<2/3>)O_3-PbTiO_3-Pb(Mg_<1/2>W_<1/2>)O_3 ternary systems. Under some conditions, materials with both JIS YB specifications (dielectric constant change less than 10% over the temperature range from -25 to 85℃) and high dielectric constant, 5000-7400, were obtained. In the materials, core-shell-like distributions of B-site components were observed. These core-shell structures consist of W-rich regions and Ti, Nb-rich regions. In the compositions containing 2% WO_3, sintered at 1150℃, core-shell-like domain structures are observed. The fringe pattern corresponded to the Ti, Nb-rich region, and superlattice electron diffraction spots indicating B-site ordertng were observed in the W-rich region. In addition, the amounts of WO_3 varied the appearance of the core-shell structure.
社団法人応用物理学会の論文
1992-09-30