Neue Oxide des Formeltyps A₂[T₃O₄]: Rb₂Li₂SiO₄ [1 ] und Rb₂Li₂GeO₄ [2 ] / New Oxides o f the Formula Type A₂[T₃O₄]: Rb₂Li₂SiO₄ [1 ] and Rb₂Li₂GeO₄ [2 ]

Open Access

1 November 1985

journal article
Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B

Vol. 40 (11) , 1441-1452
https://doi.org/10.1515/znb-1985-1105

Abstract

Rb₂Li₂Si0₄ and Rb₂Li₂Ge0₄ were prepared from the binary oxides in closed Ni-tubes at 800 and 850 °C, respectively. Crystal structures of the isotypic compounds were determined from four-circle diffractometer data (2018 and 1509 I_o(hkl), R = 8.37%, R_w = 6.39% and R = R_w = 13.68%). They crystallize triclinically, P1̄, a = 897.92(11), b = 564.73(5), c = 546.99(6) pm, α = 93.95(10), β = 111.24(9), γ = 93.75(10)° (Rb₂Li₂SiO₄) and a = 905.4(9), b = 575.4(7), c = 560.6(7) pm, α = 94.67(9), β = 110.82(10), γ = 93.60(9)° (Rb₂Li₂GeO₄) (Guinier-Simon-data). Z = 2. Effective Coordination Number (ECoN) and Madelung Part of Lattice Energy (MAPLE) values were calculated. The structure is described using Schlegel-diagrams.

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Neue Oxide des Formeltyps A2[T3O4]: Rb2Li2SiO4 [1 ] und Rb2Li2GeO4 [2 ] / New Oxides o f the Formula Type A2[T3O4]: Rb2Li2SiO4 [1 ] and Rb2Li2GeO4 [2 ]

Abstract

Keywords

Neue Oxide des Formeltyps A₂[T₃O₄]: Rb₂Li₂SiO₄ [1 ] und Rb₂Li₂GeO₄ [2 ] / New Oxides o f the Formula Type A₂[T₃O₄]: Rb₂Li₂SiO₄ [1 ] and Rb₂Li₂GeO₄ [2 ]