Ordered and disordered homologues of orthorhombic Mo[sub 4]O[sub 11] in the Mo-W-O system

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1994.1205· OSTI ID:7073215

Kihlborg, L; Marinder, B O; Sundberg, M; Portemer, F; Ringaby, O ^[1]

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1. Stockholm Univ. (Sweden)

Homologues of the orthorhombic form of Mo[sub 4]O[sub 11], belonging to the series M[sub m+2]O[sub 3m+4], have been prepared in the Mo-W-O system and structurally characterized by X-ray powder diffraction and electron microscopy. The structures are built up of corner-sharing MO[sub 6] octahedra in ReO[sub 3]-type slabs of characteristic width m and alternatingly mirrored orientation, connected by MO[sub 4] tetrahedra along planes where pentagonal tunnels are formed. The structures can be designated by [m, [bar m]]. The phases (Mo, W)[sub 4]O[sub 11], (=[6, [bar 6]]), and (Mo, W)[sub 9]O[sub 25] (=[7,[bar 7]]) were obtained almost pure and slabs of other widths, intergrown in more or less disordered fashion, were frequently observed by HREM. Slabs in parallel orientation, as in Mo[sub 4]O[sub 11](mon), have also been seen, as well as a coherent boundary across which the structure [6, [bar 6]] changes into [approximately] [5, [bar 7]].

• OSTI ID: 7073215
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 111:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON MICROSCOPY
MICROSCOPY
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
X-RAY DIFFRACTION