A new charge density wave oxide, LiVMoO5, and its tungsten analogue obtained by topotactic reduction of LiVMO6 (M= Mo,W) brannerites

Gopalakrishnan, J. ; Bhuvanesh, N. S. P. ; Vijayaraghavan, R. ; Vasanthacharya, N. Y. (1997) A new charge density wave oxide, LiVMoO5, and its tungsten analogue obtained by topotactic reduction of LiVMO6 (M= Mo,W) brannerites Journal of Materials Chemistry, 7 (2). pp. 307-310. ISSN 0959-9428

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Official URL: http://www.rsc.org/Publishing/Journals/JM/article....

Related URL: http://dx.doi.org/10.1039/A606392F

Abstract

We report the synthesis of two new low-dimensional oxides, LiVMO5 (M=Mo, W), which contain S=½ transition-metal atoms, VIV:3d1 and MoV:4d1/WV:5d1, by topotactic reduction of the LiVMO6 brannerites in hydrogen. LiVMO5 crystallizes in orthorhombic structures related to the parent brannerite structure. The VMO5 network of the new oxides is likely to correspond to one of the A2X5 structures predicted by A. F. Wells (Philos. T rans. R. Soc. L ondon A, 1984, 312, 589). LiVMoO5 is metallic showing a charge density wave (CDW) instability around 230 K; interestingly, LiVWO5 is a paramagnetic semiconductor down to 20 K.

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