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Preparation and structural study from neutron diffraction data of R2MoO6 (R=Dy, Ho, Er, Tm, Yb, Y) by J.A Alonso; F Rivillas; M.J Martı́nez-Lope; V Pomjakushin is a Materials Science article available to read on EtoBox.

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The title compounds have been prepared as polycrystalline powders by thermal treatments of stoichiometric mixtures of R 2 O 3 and MoO 3 in air. The room-temperature crystal structure for all the series has been refined from high-resolution neutron powder diffraction data. All the phases are isostructural (space group C2=c; Z 1⁄4 8) with the polymorph a-R 2 MoO 6 ; typified by Sm 2 MoO 6 : The structure contains four zigzag, one-dimensional MoO 5 polyhedral rows per unit cell, running through the RO 8 polyhedral framework along the [001] direction. MoO 5 form discrete units (i.e. do not share common oxygen), with Mo-O distances ranging from 1.77 to 2.24 A ̊, although the oxygen coordination can be extended to distances of about 3.1 A ̊, giving rise to strongly distorted MoO 8 scalenohedra. Thus, MoO 8 and RO 8 polyhedra are fully ordered in R 2 MoO 6 compounds, which in fact can be considered as superstructures of fluorite (M 3 O 6 ), containing 24 MO 2 fluorite units per unit cell, with unit-cell parameters related to that of cubic fluorite (a f 1⁄4 5:5 A ̊). A bond valence study demonstrates that the present crystal structure is especially stable for small rare-earth cations, a

Who reads Preparation and structural study from neutron diffraction data of R2MoO6 (R=Dy, Ho, Er, Tm, Yb, Y)?

Author

J.A Alonso; F Rivillas; M.J Martı́nez-Lope; V Pomjakushin

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-4596)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)