Bih, H. and Saadoune, I. and Bih, L. and Mansori, M. and Toufik, H. and Fuess, H. and Ehrenberg, H. (2016) Synthesis, Rietveld refinements, Infrared and Raman spectroscopy studies of the sodium diphosphate NaCryFe1-yP2O7 (0 ≤ y ≤ 1). Journal of Molecular Structure, 1103. pp. 103-109.

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In the present study we report on the synthesis and crystal structure studies of NaCryFe1-yP2O7 sodium diphosphate solid solution (0 ≤ y ≤ 1). The X-ray diffraction shows that these compounds are isostructural with NaFeP2O7 and NaCrP2O7 (space group P21/c (C2h5) Z = 4). The Rietveld refinements based on the XRD patterns show the existence of a continuous solid solution over the whole composition range (0 ≤ y ≤ 1). A continuous evolution of the monoclinic unit cell parameters was obtained. The transition metal ions (Cr3+ and/or Fe3+) connect the diphosphate anions forming a three-dimensional network with cages filled by Na+ cations. IR and Raman spectra have been interpreted using factor group analysis. A small shift of the band frequencies is observed when Fe is substituted by Cr. The POP bridge angles are determined from Lazarev's relation and agree well with those deduced from the crystal structure refinement. © 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Chromium compounds; Crystal structure; Infrared spectroscopy; Metal ions; Raman spectroscopy; Rietveld refinement; Solid solutions; Structure (composition); Transition metals; X ray diffraction, Continuous solid solutions; Crystal structure refinement; Diphosphates; Factor group analysis; Infrared and Raman spectroscopy; IR and Raman spectra; Synthesis and crystal structure; Three-dimensional networks, Sodium compounds
Subjects: Chemistry
Divisions: SCIENTIFIC PRODUCTION > Chemistry
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:45

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