Synthesis and structural characterization of new defect pyrochlore type AxLnySb2O6+z antimoniates (0<x, y, z<1; A = Rb, Cs, Tl; Ln = Eu, Gd, and Y) prepared by coprecipitation |
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Authors: | A El Haimouti D Zambon M El-GhozziD Avignant F LerouxM El Aatmani M Daoud |
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Affiliation: | a Laboratoire de Chimie du Solide Minéral, Département de Chimie, Faculté des Sciences Semlalia, Marrakech, Morocco b Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, Université Blaise Pascal, 63177 Aubière Cedex, France |
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Abstract: | New cubic defect pyrochlore type AxLnySb2O6+z antimoniates (0<x,y,z<1; A=Rb, Cs, Tl; Ln=Eu, Gd, and Y) (space group Fd3m) were prepared by calcination in air at 650 °C of compositions obtained by a coprecipitation method. Their crystal structures were refined by the Rietveld procedure and further confirmed by X-ray absorption spectroscopy (EXAFS) experiments. Refinements of the X-ray powder diffraction data show a partial and statistical occupation of the 8b site by alkaline or thallous ions and oxygen and lead to values close to 0.33 for the only refinable positional x parameter of the 48f oxygenated site. |
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Keywords: | C EXAFS D Crystal structure |
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