Synthesis and X-ray crystallographic and IR spectroscopic study of complex alkaline earth zirconium arsenates

• Published in: Russian journal of inorganic chemistry 2017-02, Vol.62 (2), p.218-223
• Main Authors: Pet’kov, V. I., Shipilov, A. S., Borovikova, E. Yu, Boldyrev, K. N., Koval’skii, A. M.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Electron probe microanalysis; Inorganic Chemistry; Physical Methods of Investigation
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023617020127

Arsenates A 0.5 Zr 2 (AsO 4 ) 3 (A = Mg, Ca, Sr, Ba), synthesized through sol–gel route with subsequent heat treatment, have been studied by X-ray diffraction, electron probe microanalysis, and IR spectroscopy. Mg 0.5 Zr 2 (AsO 4 ) 3 crystallizes in the Sc 2 (WO 4 ) 3 structure type (space group P 2 1 / n ). A 0.5 Zr 2 (AsO 4 ) 3 (A = Ca, Sr, Ba) crystallize in the NaZr 2 (PO 4 ) 3 structure type (space group R 3 ¯ ). The Ca 0.5 Zr 2 (AsO 4 ) 3 and Ba 0.5 Zr 2 (AsO 4 ) 3 structures have been refined by the full-profile analysis. The structure frameworks are composed of ZrO 6 octahedra and AsO 4 tetrahedra. The alkaline earth metal atoms occupy one of the two extraframework positions inside the structure columns. The internal vibrational frequencies of the AsO 4 3- tetrahedron have been assigned. The number of the observed bands corresponds to the number predicted by the factor group analysis of vibrations for space groups R 3 ¯ and P 2 1 / n .