Synthesis, crystal structure and vibrational spectra of Sr_0.5Zr₂(AsO₄)₃

A. Jrifi (1) , Abdelaziz El Jazouli (1) , Jean-Pierre Chaminade (2) , Michel Couzi (3)

1 Laboratoire de Chimie des Matériaux Solides
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 ISM - Institut des Sciences Moléculaires

Sr_0.5Zr₂(AsO₄)₃ arsenate was prepared and structurally characterized by powder X-ray diffraction and by Raman and infrared spectroscopies. Its structure, which belongs to the Nasicon-type family, was refined by the Rietveld method in the R-3 space group, from X-ray powder diffraction data. The hexagonal unit-cell parameters were determined to be a_h=8.965(2)  Å, c_h=23.955(6)  Å, V=1667.43(6)  Å³, and Z=6. The structure is formed by an ionic three-dimensional network of AsO₄ tetrahedra and ZrO₆ octahedra linked by corners with Sr²⁺ ions occupying half of the M1 sites in an ordered manner. Raman and infrared spectra were recorded and assignments of the stretching and bending vibrations of the AsO 3/4- tetrahedra were made. The number of the peaks observed is in good agreement with that predicted by the factor-group analysis of the R-3 space group.

Mots clés: Crystal structure; Infrared spectra; Powder technology; Raman spectra; Space groups; Strontium compounds; Vibrational modes; X-ray diffraction; Zirconium compounds

Domaines: Matériaux

A. Jrifi, Abdelaziz El Jazouli, Jean-Pierre Chaminade, Michel Couzi. Synthesis, crystal structure and vibrational spectra of Sr_0.5Zr₂(AsO₄)₃. Powder Diffraction, 2009, 24 (3), pp.200-204. ⟨10.1154/1.3187160⟩. ⟨hal-00418962⟩