Synthesis and Crystal Structure of New Phosphate NaFe[sup 2+][sub 4]Fe[sup 3+][sub 3][PO[sub 4]][sub 6].

New sodium iron orthophosphate NaFe[sup 2+, sub 4]Fe[sup 3+, sub 3] [PO[sub 4][sub 6] was synthesized by the hydrothermal method. The crystal structure (sp. gn P&1marc; ) was established by the heavy-atom method with the exact chemical formula of the compound berg unknown; R[sub hkl] = 0.0492, R[sub whkl] = 0.0544, S = 0.52. The new compound is anal- ogous to iron phosphate Fe[sup 2+, sub 3]Fe[sup 3+, sub 4] [PO[sub 4][sub 6] studied earlier. However, these two compounds differ in the Fe[sup 2+] and Fe[sup 3+] contents, because Na[sup +] ions in the new compound are located at the centers of symmetry not occupied earlier. [ABSTRACT FROM AUTHOR]

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