Zur Überwindung von Vorurteilen: Das erste basische Oxoindat,Na26O3[InO4]4

The First Basic Oxoindate: Na₂₆O₃[InO₄]₄ For the first time Na₂₆O₃[InO₄]₄ was obtained by annealing intimate mixtures of Na₂O, CdO and elemental In (molar ratio 3.5:1.0:2.0) in closed Ni-cylinders (30 days, 600°C) in form of yellow single crystals. The structure determination by four circle diffractometer data (MoKα, 921 out of 921 I_o(hkl), R = 2.53, R_w = 2.18%) confirms the space group 143d (cubic) with a = 1 427.37 pm and Z = 4. All kation are surrounded by tetrahedron of O^2?. In³⁺ is coordinated with O(1) and O(2) (without O(3)) only. There are ?isolated”? [InO₄]-tetrahedra. The Madelung Part of Lattice Energy, MAPLE, the Mean Fictive Ionic Radii, MEFIR, Effective Coordination Numbers, ECoN, and Charge Distribution, CHARDI, are calculated.