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Crystal Structure of the Transition‐Metal Molybdates and Tungstates. II. Diamagnetic Sc2(WO4)3 by S. C. Abrahams; J. L. Bernstein is a Physics and Astronomy article available to read on EtoBox.

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SC2(WO,)a, diamagnetic above 30 o K, crystallizes in the orthorhombic system, Space Group Pnca, with lattice constants a = 9.596± 0.004, b=13.330±0.OO3, and c=9.512±O.004 A at 298°K. The complete x-ray scattering pattern within a reciprocal lattice hemisphere of radius (sinO)/A=1.02 A-I was measured with PEXRAD. The crystal structure was solved by use of three-dimen sional Patterson and Fourier series and refined by the method of least squares, using 1731 independent structure factors. The final agreement factor R is 0.0622. Scandium atoms occupy slightly distorted octahedra, with average Sc-0=2.063 A and Sc-o distances ranging from 2.026±0.015 to 2.124±0.010 A. Two crystaJlographically independent W atoms are surrounded by somewhat distorted tetrahedra: the W-o distances vary from 1.695±0.OO9 to 1.829±0.016 A, the average being 1.761 A. The thermal vibrations are significantly anisotropic. SC2(WO.h forms the structure type for 23 trivalent metal tungstates and molybdates, including the nine smaller rare-earth tungstates. The larger rare-earth tungstates, crystallizing in the EU2 (WO.) 3 structure type, have 8 coordination about the rare-earth ion; the smaller have 6 coordination.

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Author

S. C. Abrahams; J. L. Bernstein

Published

1966

Language

EN

Field

Physics and Astronomy (Physical Sciences)