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Investigation of Crystal Structure of SrLa(FeTi)O6 and BaLa(FeTi)O6 Perovskites by Rietveld Refinement

The structures of the recently reported ordered perovskites SrLa(FeTi)O6 and BaLa(FeTi)O6 have been revisited using Rietveld analysis of the powder x-ray diffraction data. Our studies clearly show that earlier authors have incorrectly reported the tetragonal structure in the I4/m space group for SrLa(FeTi)O6 and the cubic structure in the Fm3m space group for BaLa(FeTi)O6. The correct structure is found to be orthorhombic in the Pnma space group for SrLa(FeTi)O6 while cubic in the Pm3m space group for BaLa(FeTi)O6. Thus the BaLa(FeTi)O6 is not an ordered double perovskite as the occupancies of Ba/La ions at A-site and Fe/Ti ions at B-site are disordered resulting in the primitive cubic unit cell in the Pm3m space group. Similarly, the occupancies of Sr/La ions at A-site and Fe/Ti ions at B-site are disordered in SrLa(FeTi)O6 also, ruling out the ordered perovskite structure.

preprint2015arXivOpen access
Uma ShankarPuneet Kumar AgarwalRishikesh PandeyAkhilesh Kumar Singh
cond-mat.mtrl-sci
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Uma ShankarPuneet Kumar AgarwalRishikesh PandeyAkhilesh Kumar Singh

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