Specific features of the crystal structure of erbium polyphosphate of the structural type Cстатья
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Аннотация:Erbium polyphosphate Er(PO3)(3) is synthesized at a temperature of 270 degrees C from a polyphosphoric acid melt containing cerium, erbium, and phosphorus in the atomic ratio Cs : Er : P = 5 : 1 : 15. The crystal structure of the Er(PO3)(3) polyphosphate synthesized is determined. The framework structure of the Er(PO3)(3) polyphosphate is built up of infinite polyphosphate chains and ErO6 octahedra bonded to these chains. The structure is a derivative of the structural type C, in which a large number of trivalent metal polyphosphates crystallize. The main distinguishing feature of this structural type is an increase in the parameter b of the monoclinic unit cell of the Er(PO3)(3) compound by a factor of 11 (a = 10.040 angstrom, b = 73.482 angstrom, c = 11.268 angstrom, beta = 97.28 degrees, space group Ia).