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Lanthanoids I 2800 Synthesis and Crystal Structure of (Ca,Ln)(Mn,Ti)O 3 (Ln: Rare Earth). -The new compounds Ca0.5Ln0.5Mn0.5Ti0.5O3 (Ln: La, Nd, Eu) and Ca0.67Ln0.33Mn0.33Ti0.67O3 (Ln: Y, Gd, Dy, Ho, Yb) are synthesized by solid state reactions of mixtures of Ln2O3, CaCO3, Mn2O3, and TiO2 (1273 K, 3 d). Powder XRD results show that all the compounds crystallize in the orthorhombic space group Pnma (GdFeO3-type perovskite structure). A decrease in the ionic radius of the Ln ion in these compounds causes increasing distortion from the ideal cubic perovskite structure. -(KOBAYASHI*, M.; KATSURAYA, R.; KURITA, S.; YAMAGUCHI, M.; SATOH, H.; KAMEGASHIRA, N.; J.