A new mixed-valent vanadium phosphate with a tunnel structure: Cd[sub 5]V[sub 3]P[sub 6]O[sub 25]
- Laboratoire de Cristallographie et Sciences des Materiaux, Caen (France)
A new mixed-valent phosphate Cd[sub 5]V[sub 3]P[sub 6]O[sub 25] was isolated and its structure was determined from single-crystal X-ray diffraction data. This phase crystallizes in the monoclinic space group C2/c with a = 15.861(1) [angstrom], b = 4.710(1) [angstrom], c = 24.160(2) [angstrom], [beta] = 102.07(1)[degrees], V = 1868.9(5) [angstrom][sup 3], Z = 4, R = 0.029, R[sub w] = 0.034 for 2626 unique reflections with I > 3[sigma](I). The structure consists of VO[sub 5] pyramids and VO[sub 6] octahedra occupied by V(IV) and V(III), respectively, and connected through monophosphate groups. The VO[sub 5] pyramids exhibit one abnormally short V-O distance characteristic of the vanadyl ion and form columns parallel to b. The [V[sub 3]P[sub 6]O[sub 25]][sub [infinity]] framework can be described as built up from mixed double chains [V[sub 2]P[sub 6]O[sub 24]][sub [infinity]] of corner-sharing octahedra and PO[sub 4] tetrahedra running along b; the latter are connected to each other through VO[sub 5] pyramids, located in planes parallel to (001). This host lattice forms tunnels running along b where the cadmium ions are located. The latter exhibit a distorted octahedral coordination.
- OSTI ID:
- 7284151
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 105:2; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CADMIUM COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
LATTICE PARAMETERS
MONOCLINIC LATTICES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VALENCE
VANADIUM COMPOUNDS
VANADIUM PHOSPHATES