The crystal structure of Y2P4O13 has been determined from X-ray powder diffraction data. Y2P4O13 crystallizes in the orthorhombic space group C2221 (No. 20) with a = 17.2817(7) Å, b = 6.9823(4) Å, c = 8.5391(3) Å, V = 1030.38(8) Å3, and Z = 4. The structure has been solved by direct methods using EXPO program and refined by FULLPROF package. The final RBragg value was 9.1%. The tetraphosphate anion has the point group 2 symmetry. The yttrium atom is seven-coordinated forming strongly distorted octahedron with one bifurcated vertex. There are infinite chains of oxygen-bridged ittrium atoms running parallel to the b axis and linked together by the tetraphosphate anions with formation of three-dimensional network.
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