hide
Free keywords:
-
Abstract:
The crystal structure of YTiO3 at high pressures up to 30 GPa has been investigated by means of synchrotron x- ray powder diffraction ( T = 295 K). The variation of the Ti - O bond lengths with pressure evidences a distinct change in the distortion of the TiO6 octahedra at around 10 GPa, which is discussed in terms of a pressure- driven spatial reorientation of the occupied Ti 3d( t(2g)) orbitals. Mid- infrared synchrotron microspectroscopy has been used to determine quantitatively the pressure- induced reduction of the optical bandgap of YTiO3, and the results are interpreted on the basis of the structural and possible orbital orientation changes.
