ChemInform Abstract The new title compound, prepared by hydrothermal synthesis starting from Fe3(PO4)2•3 H2O in the presence of FePO4 at 500 K and pH 2, crystallizes in the monoclinic system (P21/c, Z=4). Its structure consists of oxygen octahedra surrounding the e3+ and tetrahedral PO4H2groups which are linked by common corners. The presence of free H3O+ ions is verified using IR spectroscopy.
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