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Issue J. Phys. IV France
Volume 7, Number C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
Page(s) C2-1119 - C2-1120
DOI http://dx.doi.org/10.1051/jp4:19972152

Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-1119-C2-1120
DOI: 10.1051/jp4:19972152

Temperature Dependent Re L3-Edge X-Ray Absorption Study of Crystalline Rhenium Trioxide ReO3

A. Kuzmin1, J. Purans1, G. Dalba2, P. Fornasini2 and F. Rocca3

1  Institute of Solid State Physics, 8 Kengaraga str., 1063 Riga, Latvia
2  INFM, Università di Trento, 38050 Povo (Trento), Italy
3  Centro CNR-ITC di Fisica degli Stati Aggregati ed Impianto Ionico, 38050 Povo (Trento), Italy


Abstract
X-ray absorption spectroscopy study of crystalline ReO3 was performed at the Re L3-edge in the temperature interval from 77 to 670 K. The analysis of both XANES and EXAFS regions shows that in ReO3, a progressive localization of the 5d states following the temperature increase is accompanied at T > 350 K by a distortion of the ReO6 octahedra. The distortion increases continuously up to the ReO3 decomposition temperature Td≈ 673 K and leads to the lowering of the rheniurn site symmetry from Oh(T≤350K) →D4h(T≈513K)→C4v(T≈668K). The observed distortion is explained by (i) the strong electron-phonon coupling of the 5d electron with the M3 and M'z3 phonons and (ii) the Jahn-Teller-like effect caused by the rhenium 5d1 electron which becomes localized at high temperature.



© EDP Sciences 1997


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