The pressure dependencies at room temperature of Raman and infrared (IR) data on VO 2 are presented up to 19 and 15GPa, respectively, together with preliminary X-ray diffraction (XRD) data collected up to 42GPa. Both Raman and XRD indicate the persistence of a monoclinic lattice up the highest pressures. Observed modifications in the pressure dependence of Raman phonon frequencies, IR spectral weight, and unit cell volume at 10GPa allow us to identify two regimes at low and high pressure and to conjecture a transition to a new unknown monoclinic phase where applying pressure activates a metallization mechanism.
Marini, C., Baldassarre, L., Baldini, M., Perucchi, A., DI CASTRO, D., Malavasi, L., et al. (2010). Evidence for a monoclinic metallic phase in high-pressure VO2. HIGH PRESSURE RESEARCH, 30(1), 55-59 [10.1080/08957951003600756].
Evidence for a monoclinic metallic phase in high-pressure VO2
DI CASTRO, DANIELE;
2010-01-01
Abstract
The pressure dependencies at room temperature of Raman and infrared (IR) data on VO 2 are presented up to 19 and 15GPa, respectively, together with preliminary X-ray diffraction (XRD) data collected up to 42GPa. Both Raman and XRD indicate the persistence of a monoclinic lattice up the highest pressures. Observed modifications in the pressure dependence of Raman phonon frequencies, IR spectral weight, and unit cell volume at 10GPa allow us to identify two regimes at low and high pressure and to conjecture a transition to a new unknown monoclinic phase where applying pressure activates a metallization mechanism.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
