Abstract: | A New Orthovanadate (V): Cs2Na[VO4] Colourless single-crystals of Cs2Na[VO4] resulted by heating intimate mixtures of CsO0.52, NaO0.52 and V2O5 (Cs: Na: V = 2.2:1.1:1.0) in tightly closed Ni-tubes. The crystal structure was determined (four-circle diffractometer data), 1341 Io(hkl), R = 6.23%, Rw = 4.23%, parameters see text. The new orthovanadate(V) crystallizes monoclinic (space group P21/m) with a = 839.9(1), b = 624.7(1), c = 614.8(1) pm, β = 92.66(1)° (Guinier-Simon powder data), Z = 2. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, these calculated via Mean Fictive Ionic Radii, MEFIR, are discussed. |