In:
Acta Crystallographica Section B Structural Science, International Union of Crystallography (IUCr), Vol. 52, No. 6 ( 1996-12-01), p. 961-965
Abstract:
A combination of X-ray diffraction and high-resolution transmission electron microscopy (HRTEM) has been used to study the crystal structure of molybdenum uranium pentoxide, UMoO 5 , obtained by hydrothermal and ceramic methods. Crystal data: M r = 414.0, orthorhombic, Pbaa (number 54), a = 12.746 (1), b = 7.3494 (7), c = 4.1252 (2) Å, V = 386.4 (1) Å 3 , Z = 4, D x = 7.116 Mg m −3 , R = 0.037 for 723 reflections. The structure of UMoO 5 is related to that of UVO 5 . Both are built up by slabs of pentagonal UO 7 bipyramids with slabs of M O 6 octahedra in-between. They differ in symmetry due to different types of displacement of the M atoms from the ab plane. The HRTEM study revealed a few defect regions in the UMoO 5 crystals prepared by ceramic methods. Energy-dispersive spectroscopy (EDS) analyses indicate a slight excess of uranium in such crystals. Hypothetical models of defect regions are given.
Type of Medium:
Online Resource
ISSN:
0108-7681
DOI:
10.1107/S0108768196009597
DOI:
10.1107/S0108768196009597/ab0350sup1.cif
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
1996
detail.hit.zdb_id:
2020841-8
SSG:
13
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