パイロクロア型組成系Ln2Ce2O7 (Ln=La, Nd, Sm, Eu, Gd, Y and Yb) の結晶相と電気伝導度
作者： Hiroshi YAMAMURA , Hanako NISHINO , Katsuyoshi KAKINUMA , Katsuhiro NOMURA
关键词: Inorganic chemistry 、 Crystal structure 、 Materials science 、 Crystal 、 Lattice constant 、 Ionic radius 、 Conductivity 、 Superstructure (condensed matter) 、 Electrical resistivity and conductivity 、 Phase boundary 、 Analytical chemistry
摘要: The relationship between electrical conductivity and crystal structure in Ln2Ce2O7 (Ln=La, Nd, Sm, Eu, Gd, Y Yb) systems was investigated. phases were assigned to a fluorite (F)-type phase accompanying the rare earth C-type superstructure, when ionic radius ratio, r(Ln3+)/r(Ce4+) larger than 1.17. On other hand, La2Ce2O7 only F-type without superstructure. lattice constant increased linearly with increasing of Ln3+ independent whether or not superstructure present. Oxygen partial pressure dependence suggested that charge carrier oxide-ion, except for Nd system. at 800°C air also ratio. activation energy conduction decreased remarkably fluorite-type region. compositional change oxide-ion understood by introduction an unit cell free volume. This result supported Raman spectra.
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