High-pressure phase transitions and pressure-induced amorphization in LiVO3

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Abstract
Lithium metavanadate (LiVO3) single crystals have been studied by Raman spectroscopy under high pressure up to 200 kbar. Three phase transitions were observed and they are believed to be a series of transitions involving the breaking up of the infinite VO4- chains into VO3- ions of average symmetry C3 nu . On decompression, the LiVO3 transforms into an amorphous phase instead of reverting to the ambient crystalline phase, similarly to what has been observed for alpha -NaVO3. The difference in the behaviours between LiVO3 and alpha -NaVO3 on compression has been explained by the different sizes of the Li+ and Na+ ions. The restoration of the virgin crystalline phase and the relinking of the VO4- chains were observed after heating the reclaimed samples.