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Figure 1 Fragment of the Na4Fe2+Fe3+(PO4)3 structure (50% displacement ellipsoids) showing the bonding environments of the Fe and P cations. [Symmetry codes: (i) [{2\over 3}] + xy, [{1\over 3}]y, [{1\over 3}]z; (ii) [{2\over 3}]x, [{1\over 3}]x + y, [{1\over 3}]z; (iii) [{2\over 3}] + y, [{1\over 3}] + x, [{1\over 3}]z; (iv) x, −y[{1\over 3}], z; (v) x, xy, [{1\over 6}]z; (vi) [{1\over 3}] + y, [{2\over 3}]x + y, [{1\over 6}]z; (vii) [{2\over 3}]y, [{1\over 3}] + xy, z[{1\over 6}]; (viii) −y, −x, z; (ix) x + [{2\over 3}], y + [{1\over 3}], [{1\over 3}]z.]

ISSN: 2056-9890
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