Synthesis and Structure of Ag3PSe4

The title compound Ag3PSe4 was synthesized by the reaction of Ag powder, P2Se5 and Se in a molar ratio of 1:1:1 at 500 ℃ and structurally characterized by X-ray crystallography.The crystal belongs to orthorhombic, space group Pmn21 with cell parameters: a = 7.689(4), b =6.660(3), c = 6.379(4) A, V= 326.7(3) A3, Z = 2, Dc = 6.816 g/cm3, Mr = 670.42, F(000) = 584, μ =31.302 mm-1, R = 0.0606, wR = 0.1289 and S = 1.012. The 3-D structure can be regarded as constructed from the stacking of puckered Ag-P-Se honeycomb-like sheets along the c direction,in which the Ag, P and Se atoms are bonded to each other to form a chair-like six-membered ring,and the rings then build the sheets by sharing edges.