A high-temperature x-ray absorption spectroscopy study of ReO3
- 1. Centro CNR-ITC di Fisica degli Stati Aggregati ed Impianto Ionico, Povo, Trento (Italy)
- 2. Institute of Solid State Physics, University of Latvia, Riga (Latvia)
- 3. Istituto Nazionale di Fisica della Materia, Dipartimento di Fisica, Universita di Trento, Povo, Trento (Italy)
Description
We present for the first time a high-temperature x-ray absorption spectroscopy study of ReO3 at the ReL3 edge. The analysis both of the XANES and of the EXAFS regions shows that, in ReO3, a progressive localization of the 5d states following the temperature rise is accompanied at T > 350 K by a distortion of the ReO6 octahedra, which increases up to the ReO3 decomposition temperature Td approx. = 673 K. The distortion leads to the lowering of the rhenium site symmetry from Oh(T ≤ 350 K) → D4h(T approx. = 513 K) → C4υ(T approx. = 668 K) and is due to the electron-phonon coupling of the 5d electrons with the M3 and M31Z phonons and to the Jahn-Teller effect caused by the rhenium 5d1 electron which becomes localized at high temperature. (author)
Availability note (English)
Available online at the Web site for the Journal of Physics. Condensed Matter (ISSN 1361-648X) http://www.iop.org/Additional details
Identifiers
- URL
- http://www.iop.org/;
Publishing Information
- Journal Title
- Journal of Physics. Condensed Matter
- Journal Volume
- 8
- Journal Issue
- 46
- Journal Page Range
- p. 9083-9102
- ISSN
- 0953-8984
INIS
- Country of Publication
- United Kingdom
- Country of Input or Organization
- Poland
- INIS RN
- 32026827
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ABSORPTION SPECTRA; D STATES; ELECTRON-PHONON COUPLING; JAHN-TELLER EFFECT; MOLECULAR STRUCTURE; RHENIUM OXIDES; TEMPERATURE RANGE 0400-1000 K; X-RAY SPECTROSCOPY
- Descriptors DEC
- CHALCOGENIDES; COUPLING; ENERGY LEVELS; OXIDES; OXYGEN COMPOUNDS; REFRACTORY METAL COMPOUNDS; RHENIUM COMPOUNDS; SPECTRA; SPECTROSCOPY; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS