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Figure 1 ORTEP-3 view of the repeating unit with eight PO4 tetrahedra, leading to helical (PO3)∞ chains. Displacement ellipsoids are drawn at the 50% probability level. Symmetry codes: (a) − + x, 3/2-y, + z; (b) −1 + x, −1 + y, z; (c) x, −1 + y, 1 + z; (d) −1 + x, y, z; (e) − + x, 1/2-y, + z; (f) 3-x, 1-y, 1-z; (g) 2-x, 1-y, 1-z; (h) 5/2-x, − + y, 1/2-z; (i) − + x, 1/2-y, − + z; (j) 3/2-x, − + y, 1/2-z; (k) 2-x, 1-y, −z. |