アーク溶融法によるRGaO_3の合成と性質,RAlO_3との比較

概要

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Synthesis of perovskite-type RGaO_3 was attempted by the arc-melting method and compared with the data for RAlO_3. RGaO_3 were obtained only for R=La to Nd, however, those of RAlO_3 were obtained widely for R=La to Tm. These regions are discussed from a view point of tolerance factor, t. The formation range of perovskite-type compound is limited to t=0.95 both for RGaO_3 and RAlO_3 by this synthetic method. Garnet phase was mainly obtained for R=Sm to Lu. CeGaO_3 is crystallized in tetragonal structure with lattice parameters of a=0.3873(1)nm, c=0.3880(1)nm (space group: P4/mmm), which is different from cubic as reported in literatures. CeGaO_3 is completely decomposed into starting materials by heating in air up to 1300℃. The crystal structure and thermochemical behaviour of CeGaO_3 were essentially the same as those of CeAlO_3.
社団法人日本セラミックス協会の論文
1997-08-01