Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Mixed Ag₃[AsO₄, VO₄] crystals were prepared over the whole concentration range. In the 0-40% mol. Vanadate concentration range the mixed crystals are isostructural with Ag₃AsO₄ (T⁴_d, Z = 2). Site- and factor group analyses were carried out for this space group and structure. Above 60 mol% vanadate, the mixed crystals are tetragonal with Ag₃VO₄ structure. It follows from the behaviour of the ν₄AsO^3-₄ vibration that, in cubic mixed crystals with 40 mol% Ag₃VO₄, the site-symmetry T is reduced to effective site-symmetry C₃ by the effect of lattice vibrations of the T(F) and R(F) types.