In:
Journal of Materials Research, Springer Science and Business Media LLC, Vol. 9, No. 4 ( 1994-04), p. 891-897
Abstract:
Superstructuring in the new compound Fe 1.89 Mo 4.11 O 7 has been elucidated by transmission electron microscopy. This compound is a member of the family M 2 MO 4 O 7 and has both iron and molybdenum atoms occupying octahedrally coordinated sites in the structure, represented by Fe t (Fe 0.89 M 0.11 ) 0 Mo 4 O 7 . The superstructuring, detected only by electron diffraction, involved tripling of all three lattice parameters of the subcell. The subcell was structured by single crystal x-ray diffraction [Imma, no. 74, a = 5.9793(5) Å, b = 5.7704(4) Å, and c = 17.036(1) Å]. This structure type contains a close-packed arrangement of Mo 4 O 7 units, which are infinite chains of trans edge-shared molybdenum octahedra running parallel to b*. Two different coordination environments are observed for the cations. Parallel to the a* direction, infinite edge-sharing MO 6 (M = 89% Fe or 11% Mo) octahedra are observed. The second cation site, with nearly tetrahedral coordination by oxygen, is filled solely by iron. The superstructure can be rationalized by a regular arrangement of iron and molybdenum atoms in the octahedrally coordinated cation sites.
Type of Medium:
Online Resource
ISSN:
0884-2914
,
2044-5326
DOI:
10.1557/JMR.1994.0891
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
1994
detail.hit.zdb_id:
54876-5
detail.hit.zdb_id:
2015297-8
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