一定の格子定数をもつパイロクロア型組成系(Yb_<1-x>Nd_x)_2(Ce_<1-0.88x>Zr_<0.88x>)_2O_7の酸化物イオン伝導度

概要

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Oxide-ion conductivity of pyrochlore-type solid solution was measured for the compositions of (Yb_<1-x>Nd_x)_2 (Ce_<1-0.88x>Zr_<0.88x>)_2O_7 (YbNd system), which had various average cation radius ratio, r(A^<3+>)/r(B^<4+>), but constant lattice parameters and oxygen content. The crystal structure of the YbNd system were assigned to rare-earth C-type (x=0), fluorite-type (0.2≦x≦0.8) and pyrochlore-type (x=1.0) phases, depending on the average cation radius ratio of r(Yb_<1-x>Nd_x)/r(Ce_<1-0.88x>Zr_<0.88x>). The oxide-ion conductivity of the YbNd system decreased with an increase in the ordering of oxygen vacancy. These results were supported by the results of Raman spectra of the YbNd system.
社団法人日本セラミックス協会の論文
2005-03-01