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.
Original language | English |
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Article number | 406223 |
Number of pages | 9 |
Journal | Journal of Physics: Condensed Matter |
Volume | 19 |
Issue number | 40 |
DOIs | |
Publication status | Published - 10 Oct 2007 |
Keywords / Materials (for Non-textual outputs)
- TRANSITION-METAL OXIDES
- high pressure
- PEROVSKITES
- crystal structure
- infrared and Raman spectroscopy