高誘電材料の研究(第3報) : チタン系固溶体の研究

概要

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Dielectric properties of the solid solutions of PbTiO_3 and PbSnO_3 were investigated, for the purpose of clearing the role of Y ion in the perovskite type structure of XYO_3. Two phases seem to co-exist in the samples containing Sn richer than 75%, although the whole range solid solution would be expected from the standpoint of the "tolerance factor." The Curie point moves to the lower temperature with the increase of the ratio of PbSnO_3 up to about 75% and reaches 200℃ in Pb(20% Ti, 80% Sn)O_3. The absolute value of the dielectric constant of these substances has the maximum at the concentration of 75% Sn ion. The lattice constants of these substances were also investigated by the x-ray analysis, and c/a, which is 1.06 in PbTiO_3, was found to approach 1 in this region. Although the typical D-E hysteresis loop was observed for the samples containing Ti richer than 80%, the approach of saturation on the max. polarization versus field curve was not. From the above-stated investigations, it was found that Ti ion and Sn ion behave differently in the ferroelectric region of these substances.
宇宙航空研究開発機構の論文
1953-07-20