Abstract
We report pressure-induced structural instability and amorphization in compressed orthorhombic α-V2O5 by in situ synchrotron x-ray diffraction observations and Raman spectroscopy measurements in diamond-anvil cells up to 20.2 GPa and 21.9 GPa, respectively. In situ x-ray lattice parameters (a, b, c) and d-spacings at high pressure show that the orthorhombic α-V2O5 exhibits an apparent discontinuity at ∼4.3 GPa, indicating the occurrence of structural distortion upon compression. Upon further pressurization, the distorted α-V2O5 starts to be amorphizing at ∼12.6 GPa and becomes fully amorphous at ∼20.2 GPa, which is again confirmed by our high-pressure Raman spectroscopy measurements. This obtained amorphous V2O5 polymorph can be recovered at ambient conditions, showing that the pressure-driven distorted orthorhombic-to-amorphous phase transformation is irreversible. Moreover, Grüneisen parameters of various Raman modes for α-V2O5 are derived, which are in agreement with the previously experiential study by Arora et al. Our results might be important to understand the high-pressure behaviors in M2O5 polymorphs for their uses at extreme conditions.
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