Crystal Structure and Magnetic Properties of BaVSi2O7

The structure of the second phase (β-) of BaVSi2O7, has been solved by single crystal X-ray diffraction, and its magnetic properties have been examined in the temperature range 5-300 K. β-BaVSi2O7 crystallizes in the tetragonal system, space group I4/m (No. 87), with a = 7.0535(7) Å, c = 11.467(2), V = 570.5(3) Å3, and Z = 4. This structure can be considered as consisting of VO6-5 square pyramids and unbranched single rings of [Si4O12]8-, or of …