Issue |
Europhys. Lett.
Volume 61, Number 4, February 2003
|
|
---|---|---|
Page(s) | 554 - 560 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2003-00170-7 | |
Published online | 01 February 2003 |
Observation of the high-pressure {Pmma} phase in : A combined X-ray absorption and diffraction study
1
European Synchrotron Radiation Facility - 6 rue J. Horowitz, 38043 Grenoble, France
2
Unità di Ricerca INFM and Dipartimento di Fisica, Università di Camerino
Via Madonna delle Carceri, 62032 Camerino (MC), Italy
3
Physique des Milieux Condensés, CNRS UMr 7602 Université Pierre et Marie Curie, B
77 - 4 Place Jussieu, F-75252 Paris, France
Corresponding author: sakura@esrf.fr
Received:
20
June
2002
Accepted:
9
December
2002
X-ray absorption and diffraction measurements on up to 80 reveal the presence of a high-pressure short-range chemically disordered Pmma structure and shows no evidence of the phase. The combination of the two techniques proved to be essential to fully describe the new phase. Since Pmma symmetry has recently been shown to be a direct consequence of a phonon instability of , this result highlights recent theoretical calculations that are able not only to identify instabilities in “statically” stable phases, but also to predict the occurrence of alternative symmetries.
PACS: 81.30.Hd – Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder / 64.70.Kb – Solid-solid transitions / 61.10.Ht – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc
© EDP Sciences, 2003
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