Abstract
The new CaLa 2CaTi 2O 9 (=(Ca 1/3La 2/3)(Ca 1/3Ti 2/3)O 3) perovskite was prepared by solid state reaction at 1300 °C in air atmosphere. The structure refinement by Rietveld analysis using X-ray powder diffraction (XRD) shows that the cationic distribution over the A and B site of this perovskite can be illustrated by the crystallographic formula (Ca 1/3La 2/3) A(Ca 1/3Ti 2/3) BO 3. The diffraction pattern is interpreted to exhibit splitting of the hkl and h0 l lines indicative of a monoclinic ( P2 1/ n space group) derivative of the GdFeO 3-type structure with lattice parameters: a=5.5865(2) Å, b=5.7077(2) Å, c=7.9805(5) Å and β=90.10(2)°. The monoclinic structural distortion involves partial 1:1 ordering between Ti 4+ (in 2c site) and a random mixture ( 2/3 Ca 2+; 1/3 Ti 4+) (in 2d site) all at the B-perovskite sites.
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