Abstract
A mixed valent tungsten phosphate with an original layered structure Cs 3W 4O 7(PO 4) 4⋅H 2O has been synthesized, whose [W 4P 4O 23] ∞ layers consist of corner-shared PO 4 tetrahedra, WO 6 single octahedra and W 2O 11 bioctahedra. In this structure, H 2O is zeolitic and Cs + cations exhibit abnormally high thermal agitation along one direction at room temperature. Ionic conductivity measurements show that cesium exhibits a high mobility with two domains for the ionic conductivity versus temperature. Models are proposed based on 1D and 2D ionic conductions and taking also into consideration the possibility of electronic delocalization at higher temperature.
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