Abstract

The crystal data for lithium aluminogermanate, Li 3AlGeO 5, are M r 200.386, orthorhombic, P2 1 nb, a = 4.881(1), b = 5.404(3), and c = 15.841(7)Å, V = 417.9Å 3, Z = 4, D x = 3.184 g cm −3, λ(Mo Kα) = 0.71069Å, F(000) = 376.0, T = 298 K, R = 0.043, and R w = 0.045 for 553 independent reflections. The structure consists of hexagonal close-packed oxide ions with cations ordered over one set of tetrahedral sites. It may also be described as a cristobalite-like sheet structure. The phases Li 3AlSiO 5, Li 3GaSiO 5, and Li 3GaGeO 5 are isostructural, as confirmed by Rietveld refinement.

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