Structure refinement of mixed oxides FexCo1−xTa2O6 (original) (raw)

Journal of Physics and Chemistry of Solids, 2001

Abstract

Abstract We report X-ray powder diffraction measurements performed on synthetic samples of the tapiolite-like Fe x Co 1− x Ta 2 O 6 solid solution. The crystal structure has been refined by the Rietveld method, by using the program fullprof . All the samples are tetragonal and were indexed to the space group P 4 2 / mnm . The end-members (FeTa 2 O 6 and CoTa 2 O 6 ) have unit-cell parameters quite similar to those previously published. The unit-cell parameters a and c for the mixed samples vary linearly with the cation substitution (Co→Fe) according to the Vegard's law in all the range of substitution.

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