1. Pressure-induced amorphization of charge ordered spinel AlV2O4 at low temperature.
- Author
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Malavi, Pallavi S., Karmakar, S., Maurizio, P., and Sharma, S. M.
- Subjects
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PRESSURE-induced transformations , *AMORPHIZATION , *ALUMINUM compounds , *CRYSTALS at low temperatures , *X-ray diffraction , *SOLID state chemistry - Abstract
Structural properties of charge ordered spinel AlV2O4 have been investigated under high pressure at low temperature (80K) by synchrotron based x-ray diffraction measurements. It is observed that upon increasing pressure the structure becomes progressively disordered due to the distortion of the AlO4 tetrahedral unit and undergoes amorphization above ~12 GPa. While releasing pressure, the rhombohedral phase is only partially recovered at a much lower pressure (below 5 GPa). Within the stability of the rhombohedral phase, the distortion in the vanadium heptamer increases monotonically with pressure, suggesting enhanced charge ordering. This result is in sharp contrast with the recent observation of pressure-induced frustration in the charge ordered state leading to structural transition to the cubic phase at room temperature [JPCM 25, 292201, 2013].. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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