Author： Ledain S. Leclaire A. Borel M.M. Raveau B.
Publisher： Academic Press
ISSN： 0022-4596
Source： Journal of Solid State Chemistry, Vol.122, Iss.1, 1996-02, pp. : 107-110
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
A new mixed valent molybdenum monophosphate, Li x Mo 2 O 3 (PO 4 ) 2 with a tunnel structure has been synthesized. Although closely related to the monophosphate Na x (Mo, W) 2 O 3 (PO 4 ) 2 , this phase differs from the latter by its triclinic symmetry with a = 7.355(2) A, b = 6.361(2) A, c = 8.979(1) A, alpha = 90.17(2)#°, beta = 106.47(2)#°, gamma = 90.26(2)#°. The [Mo 2 P 2 O 11 ] [infinity] framework is very similar to that observed for the sodium phase: it consists of Mo 2 PO 13 units linked to each other through single PO 4 tetrahedra forming infinite [Mo 2 P 2 O 15 ] [infinity] chains running along c. The main difference with respect to the monophosphate Na x (Mo,W) 2 O 3 (PO 4 ) 2 deals with the distribution of the Li + cations that are located in small tunnels with an octahedral coordination, whereas Na + 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.
Related content
Access to resources
Recommend
