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.
Evidence for a monoclinic metallic phase in high-pressure VO 2 / Marini, Carlo; Baldassarre, Leonetta; M., Baldini; A., Perucchi; DI CASTRO, Daniele; L., Malavasi; Lupi, Stefano; Postorino, Paolo. - In: HIGH PRESSURE RESEARCH. - ISSN 0895-7959. - 30:1(2010), pp. 55-59. (Intervento presentato al convegno 47th Meeting of the European-High-Pressure-Research-Group (EHPRG 47) tenutosi a Paris, FRANCE nel SEP 06-11, 2009) [10.1080/08957951003600756].
Evidence for a monoclinic metallic phase in high-pressure VO 2
MARINI, CARLO;BALDASSARRE, Leonetta;DI CASTRO, Daniele;LUPI, Stefano;POSTORINO, Paolo
2010
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.
