パイロクロア型組成を有するEu_2Zr_2O_7及びLa_2Ce_2O_7の交流伝導度

概要

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Ac conductivity (σ_<ac>) obtained from admittance of Eu_2Zr_2O_7 and La_2Ce_2O_7, which have pyrochlore- and fluorite-type structure, respectively, was measured as a function of frequency in the range between 5 Hz and 13 MHz and in the temperature range between 573 and 1073 K. The frequency dependence of the σ_<ac> of these oxideion conductors showed a remarkably different behavior from that of the cation ones. By comparison of the σ_<ac> with other conductivity data obtained by dc four-probe and impedance spectroscopic methods, it was found that the σ_<ac> in the frequency range below 10^5 Hz was strongly influenced by space charge polarization at grain boundary and that the σ_<ac> obtained from high frequency plateau agreed with bulk conductivity, σ_<ib>, from impedance spectra and dc conductivity, σ_<dc>.
社団法人日本セラミックス協会の論文
2004-10-01