Edge and EXAFS Studies of Bi_2O_3-Y_2O_3 Oxygen Conductor

概要

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EXAFS and XANES measurements are made for (Bi.0,-Y.0,) system, (Bi.0.)...,(Y.0.)..., at 300 K and (Bi.O,)..,(Y.0,)... at 60 K and 300 K, to elucidate their defectstructure and the glass-like behaviors at low temperatures. In both ceramics the largerchemical shift of Y K-edge to lower energy measured from that of Y.0, is observed ascompared with that of Bi L,-edge measured from that of Bi.0.. Small coordinationnumber of oxygen around Y Jon is also obtained by curve-fitting analysis of EXAFSfor these ceramics. The results imply that oxygen defect mostly concentrates arounddopant yttrium cation preserving charge balance with each other. To elucidate theglass-like behavior at low temperatures (below 12 K), schematic microscopic model ofthe defect structure is presented based on the data obtained t?ere.
社団法人日本物理学会の論文
1986-07-15