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The existence of Ca 2 AlF 7  is confirmed. Lattice constants (Guinierde Wolff photographs, Cu Kα  1 ) are  a  = 7.685 Å;  b  = 6.998 Å;  c  = 9.549 Å;  d  rö  = 3.10g cm −3 ;  d  pyk  = 3.07g cm −3 ;  Z  = 4; space group  P  nma . The structure was determined using 826 unique reflections [4-circle diffractometer PW1100, Mo Kα ]; the refinement with anisotropic temperature factors led to  R   w   = 0.039. According to Ca 2 F[AlF 6 ] nearly octahedral groups [AlF 6 ] are linked by Ca(1) and Ca(2). The ‘lone’ F(1) is coordinated by 3 Ca; Ca(1) has coordination number 7 and Ca(2) 7 + 1. Details of the structure are discussed using the Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN.

The crystal structure of Ca 2 AlF 7