On the basis of certain assumptions regarding the coordination polyhedra in the cubic crystal aluminum metaphosphate, ΑΙ{ΡΟ Λ ). Λ , a structure is formulated which accounts satisfactorily for the observed X-ray data. The unit cube, with a B = 13.63 A, contains 16 Al(P0 3 ) 3 in the following positions of the space group τΙ-llZd·. 16 Al in 16c with u = 0.117; 48 Ρ in 48e with X = 0.340, y = 0.063, ζ = 0.124 48 0 1 in 48e with X I = 0.090, y\ = 0.110, zj = 0.800 48 Ο π in 48e with x n = 0.095, m = 0.141, z n = 0.245 48 0m in 48e with = 0.137, yiu = 0.096, z m = 0.986.The crystal contains complexes P 4 0 12 consisting of four P0 i tetrahedra with Ρ -0 = 1.51 A, each of which shares two corners with other tetrahedra and the other two corners with AlO e octahedra. Each AlO a octahedron (with Al-O = 1.83 A) shares its six corners with six surrounding P 4 0 12 complexes. The structure of the metaphosphate group in this crystal (the first metaphosphate analyzed) is closely similar to that of the metasilicate group in various metasilicates.
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