過剰のアルカリ土類酸化物を含むBa_xSr_yLa_<0.50>InO_<2.25+x+y>系の陽イオン分布と導電率

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We have investigated the influence of the excess doping of alkaline earth oxides on the structure and electrical conductivity of the Ba_xSr_yLa_<0.50>InO_<2.25+x+y> (x+y≧0.5) system. It was found that over 0.10 mol of BaO or SrO could be doped in 1 mol of the cation stoichiometric system (x+y=0.50). We propose that some of the Sr cation move from A-sites to B-sites in this system to maintain the cation stoichiometry [(x+y+0.50):In=1:1]. The dependence of the electrical conductivity on the oxygen partial pressure varied with the magnitude of the oxide ion conductivity. The oxide ion conductivity of the excess-doped system was dependent on the unit cell free volume. The relationship corresponded to that of stoichiometric Ba_xSr_yLa_<0.50>InO_<2.25> (x+y=0.50) and Ba_<1-y>La_yInO_<2.50+y> systems.
社団法人日本セラミックス協会の論文
2006-05-01