A mixed-valent molybdenum monophosphate with a layer structure: KMo[sub 3]P[sub 2]O[sub 14]

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1994.1084· OSTI ID:6880719

Guesdon, A; Borel, M M; Leclaire, A; Grandin, A; Raveau, B ^[1]

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1. Universite de Caen (France)

A new mixed-valent molybdenum monophosphate with a layer structure KMo[sub 3]P[sub 2]O[sub 14] has been isolated. It crystallizes in the space group P2[sub 1]/m with a = 8.599 (2) [angstrom], b = 6.392(2) [angstrom], c = 10.602(1) [angstrom], and [beta] = 111.65 (2)[degrees]. The layers [KMo[sub 3]P[sub 2]O[sub 14]][sub [infinity]] are parallel to (100) and consist of [MoPO[sub 8]][sub [infinity]] chains running along b, in which one MoO[sub 6] octahedron alternates with one PO[sub 4] tetrahedron. In fact, four [MoPO[sub 8]][sub [infinity]] chains share the corners of their polyhedra and the edges of their octahedra, forming [Mo[sub 4]P[sub 4]O[sub 24]][sub [infinity]] columns which are linked through MoO[sub 5] bipyramids along c. The K[sup +] ions interleaved between these layers are surrounded by eight oxygens, forming bicapped trigonal prisms KO[sub 8]. Besides the unusual trigonal bipyramids MoO[sub 5], this structure is also characterized by a tendency to the localization of the electrons, since one octahedral site is occupied by Mo(V), whereas the other octahedral site and the trigonal bipyramid are occupied by Mo(VI). The similarity of this structure with pure octahedral layer structures suggests the possibility of generating various derivatives, and of ion exchange properties.

• OSTI ID: 6880719
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 109:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
LAYERS
MOLYBDENUM COMPOUNDS
MOLYBDENUM PHOSPHATES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM PHOSPHATES
REFRACTORY METAL COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS