A new mixed valent molybdenum monophosphate with a tunnel structure: Li{sub x}Mo{sub 2}O{sub 3}(PO{sub 4}){sub 2}
Journal Article
·
· Journal of Solid State Chemistry
- CNRS-ISMRA et Universite de Caen (France)
A new mixed valent molybdenum monophosphate, Li{sub x} Mo{sub 2}O{sub 3}(PO{sub 4}){sub 2} with a tunnel structure has been synthesized. Although closely related to the monophosphate Na{sub x}(Mo, W){sub 2}O{sub 3}(PO{sub 4}){sub 2}, this phase differs from the latter by its triclinic symmetry with {alpha} = 7.355(2) {Angstrom}, b - 6.361(2) {Angstrom}, c = 8.979(1) {Angstrom}, {alpha}=90.17(2){degrees}, {Beta}=106.47(2){degrees}, {gamma}=90.26(2){degrees}. The [Mo{sub 2}P{sub 2}O{sub 11}] {infinity} framework is very similar to that observed for the sodium phase: it consists of Mo{sub 2}PO{sub 13} units linked to each other through single PO{sub 4} tetrahedra forming infinite [Mo{sub 2}P{sub 2}O{sub 15}]{infinity} chains running along c. The main difference with respect to the monophosphate Na{sub x}(Mo,W){sub 2}O{sub 3}(PO{sub 4}){sub 2} deals with the distribution of the Li{sup +} cations that are located in small tunnels with an octahedral coordinations that are located in small tunnels with an octahedral coordination, whereas Na{sup +} ions are located in large tunnels with two kinds of coordination. This phase also differs from the molybdenotungsten monophosphate by the much lower amount of Mo(V). The distribution of the Mo(V) and Mo(VI) species over the two octahedral sites of the structure is discussed.
- OSTI ID:
- 263731
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 122; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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