THE 1ST OXOTHALLATE(III) WITH THE FORMULA TYPE AA4'[MO4] - CSK4[TLO4]

For the first time CsK4[TlO4] was obtained by heating intimate mixture s of K2O, CdO and CsTl (molar ratio 3.1: 1.0: 1.0) in closed Ag-cylind ers (25 days, 450-degrees-C) in form of yellow, transparent single cry stals. The structure determination by four circle diffractometer data (MoKalpha, 1922 out of 2094 I(o)(hkl), R = 2.98, R(w) = 2.49) confirms the space group Pbca with lattice constants a = 1192.1 pm; b = 685.7 pm; c = 2143.5 pm; Z = 8. The structure is isotypic with Na5[GaO4]. Th e Madelung Part of Lattice Energy, MAPLE, the Mean Fictive Ionic Radii , MEFIR, Effective Coordination Numbers, ECoN, and Charge Distribution , CHARDI, are calculated.