The partial substitution of potassium atoms by strontium atoms in initial matrix K3Fe2(PO4)3 with formation of complex phosphates K3−2xSrx Fe2(PO4)3 (x = , , and ) was determined using a solid-state reaction method. According to powder X-ray diffraction (XRD) data, the prepared phosphates with x = and crystallize in a cubic system (space group P213) and belong to langbeinite family compounds, while for the sample with x = a mixture of langbeinite-type phase and a minor amount of K3Fe2(PO4)3 was obtained. The decreasing trend of lattice parameter a with increase of Sr amount in the phosphate confirmed the incorporation of strontium in the langbeinite-related structure. |
