We present structural studies of V1-xCrxO2 (pure, 0.7 %, and 2.5% Cr-doped) compounds at room temperature in a diamond anvil cell for pressures up to 20 GPa using synchrotron x-ray powder diffraction. All the samples studied show a persistence of the monoclinic M-1 symmetry between 4 and 12 GPa. Above 12 GPa, the monoclinic M-1 symmetry changes to isostructural M-x phase (space group P2(1)/c) with a significant anisotropy in lattice compression of the b-c plane of the M-1 phase. This behavior can be reconciled invoking the pressure-induced charge delocalization.
Anisotropic compression in the high-pressure regime of pure and chromium-doped vanadium dioxide / Matteo, Mitrano; Beatrice, Maroni; Carlo, Marini; Michael, Hanfland; Joseph, Boby; Postorino, Paolo; Lorenzo, Malavasi. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 85:18(2012), p. 184108. [10.1103/physrevb.85.184108]
Anisotropic compression in the high-pressure regime of pure and chromium-doped vanadium dioxide
POSTORINO, Paolo;
2012
Abstract
We present structural studies of V1-xCrxO2 (pure, 0.7 %, and 2.5% Cr-doped) compounds at room temperature in a diamond anvil cell for pressures up to 20 GPa using synchrotron x-ray powder diffraction. All the samples studied show a persistence of the monoclinic M-1 symmetry between 4 and 12 GPa. Above 12 GPa, the monoclinic M-1 symmetry changes to isostructural M-x phase (space group P2(1)/c) with a significant anisotropy in lattice compression of the b-c plane of the M-1 phase. This behavior can be reconciled invoking the pressure-induced charge delocalization.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
