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A new complex phosphate K 1.84 Fe 1.42 Nb 0.58 (PO 4 ) 3  has been synthesized by the self-flux technique. The X-ray single crystal structure and magnetic properties were studied. The compound crystallizes in the cubic system with space group P2 1 3 (a = 9.9404(10) Å ) and belongs to the langbeinite structure type. The structure contains [M 2 P 3 O 18 ] building units. “Closed” fragments [M 8 P 9 O 60 ] provide space for location of two potassium atoms. Antiferromagnetic interactions were detected at low temperatures which originate from superexchange through a M(1)-O-P-O-M(2) pathway with corresponding J = −5.5(1) cm −1 . The relationship between the UV/vis absorption and the structure is discussed.

Synthesis, Structure and Magnetic Characterization of a New Phosphate K 1.84 Fe 1.42 Nb 0.58 (PO 4 ) 3 with the Langbeinite- type Structure