High pressure behavior of α-NaVO3: A Raman scattering study |
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Authors: | Rekha Rao T. Sakuntala S.K. Deb |
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Affiliation: | a High Pressure Physics Division, Bhabha Atomic Research Center, Mumbai 400085, India b Solid State Physics Division, Bhabha Atomic Research Center, Mumbai 400085, India |
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Abstract: | The reported pressure-induced amorphization in α-NaVO3 has been re-investigated using Raman spectroscopy. Discontinuous changes are noted in the Raman spectrum above 5.6 GPa implying large structural changes across the transition. The decrease in frequency of the V-O stretching mode across the transition suggests that the vanadium atom may be in octahedral coordination in the high pressure phase. Excessive broadening of the internal modes is observed above 6 GPa. New peaks characteristic of a crystalline phase gain in intensity at higher pressures in the bending modes region; however, the transformation is not complete even at 13 GPa. Co-existence of phases is noted over a significant pressure range above the onset of transition. Pressure released spectrum is found to be a mixture of crystalline α-phase, traces of crystalline β-phase and highly disordered phase consisting of V-O units in five- and six-fold coordination. |
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Keywords: | Raman spectroscopy High pressure Phase transition NaVO3 |
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