高誘電材料の研究 : I.チタン系固溶体の研究(第二報)

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In Part I, we have investigated the physical properties of solid solutions of barium-strontium titanate and barium・lead titante. Dielectric and thermal properties of solid solutions of lead・strontium titanate were investigated in this paper. The Curie point of these substances decreases linearly in proportion to the molar ratio of strontium titanate, and reaches -140℃ for (10 Pb・90 Sr) TiO_3. The Curie constant varies in the range of 3×10^4℃ to 9×10^4℃. Large anomalies of the specific heat and the thermal expansion were observed at the transition temperatures. The anomalous specific heat of pure lead titanate is 900 cal/mol and the percentage of the thermal contraction reaches about 0.26%, which decrease logarithmically with the added amount of strontium titanate. We determined the lattice constants of these substances by the X-ray analysis. (Received January 10, 1953)
宇宙航空研究開発機構の論文
1953-03-28