CaS-Na_2S系固溶体のイオン伝導と輸率

概要

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To obtain highly ionic conductor of sulfides, a solid solution of 95CaS-5Na2S was prepared by sintering the high-purity powder mixture of CaS and Na2S under the pressure of 3kg/cm2 and the temperature of 1423K. The electrical conductivities of the solid solution were measured under a sulfur partial pressure range from 10-10 to 103 Pa, furthermore the concentration cell Fe, FeS|95CaS-5Na2S|Mn,MnS was constructed and the electro motive force measurements were made.The conductivity increased by more than two orders of magnitude rather than that of CaS, and was independent on the sulfur partial pressure under an atmosphere of PS2=10-10-103 Pa and a temperature range of 973∼1173K. These results lead to the conclusion that the 95CaS-5Na2S solid solution is an ionic conductor.Because the measured emf values for the concentration cell agreed well with the theoretical values calculated from the Nernst equation, it is concluded that the ionic transference number of the solid solution is unity.
社団法人資源・素材学会の論文
2006-02-25