Abstract
A study of lithium and sodium insertion in W 3Nb 14O 44, a block structure type phase, has been carried out. During the electrochemical insertion, the formation of several solid solution regions of general formula Li x W 3Nb 14O 44 (0 ≤ x ≤ 28) and Na y W 3Nb 14O 44 (0 ≤ y ≤ 0.5), have been observed. Structural changes originated by lithium insertion in the parent oxide, have been evaluated by X-ray powder diffraction.
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