Collect. Czech. Chem. Commun. 1979, 44, 823-828

Infrared absorption spectra of Ag3[PO4, VO4] mixed crystals

Bohumil Hájek, Alexander Muck and Olga Smrčková

Department of Inorganic Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


Ag3[PO4, VO4] mixed crystals were prepared in the whole concentration region. For 0-40 mol % vanadate, the mixed crystals are isostructural with the low-temperature modification of Ag3PO4 (Td4, Z = 2); the site group and factor group analysis was performed for this space group. Mixed crystals containing 60% vanadate and more are tetragonal with the structure of Ag3VO4. From the analysis of the infrared spectra it follows that in the cubic mixed crystal with 40 mol % Ag3VO4, the site symmetry T is additionally lowered to the effective site symmetry C3 due to the effect of the lattice vibrations of the types T(F) and R(F).