CeO_2-Y_2O_3焼結体の作製とpH電極への応用

概要

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Oxygen-ion conductive CeO_2 ceramics doped with Y_2O_3 and Gd_2O_3 were prepared by sintering pellets of these oxide mixture pressed at 150 MPa under atmospheric pressure at upper 1500℃. Electrical property was investigated by measuring the d.c. electrical conductivity in air, as a function of temperature. Electrochemical property was also measured potential as a pH membrane electrode in buffer solution's with defferent pH's. The CeO_2 specimen doped with 5 mol%Y_2O_3 sintered at 1700℃ showed the highest ion conductivity at temperature lower than 100℃. The pH response of the membrane pH electrode with the CeO_2 specimen doped with 5 mol%Y_2O_3 sintered at 1700℃ was indicated Nernstian response. The specific potential was obtained in about 30s at 25℃ and about 10s at 75℃ in buffer solutions.
社団法人日本セラミックス協会の論文
1992-10-01