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Figure 1 The expanded asymmetric unit of Na7(AlP2O7)4PO4 showing the coordination environments of the P and Al atoms. The displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (iii) −y + 1, x, −z + 1; (vii) −x + 1, −y + 1, z; (viii) −y + 1, x, −z + 2; (ix) x − , −y + , −z + ; (x) y, −x + 1, −z + 1.] |