X-ray diffraction and Raman study of dl-alanine at high pressure: Revision of phase transitions

Nikolay A. Tumanov, Elena V. Boldyreva

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The effect of pressure on dl-alanine has been studied by X-ray powder diffraction (up to 8.3 GPa), single-crystal X-ray diffraction and Raman spectroscopy (up to ∼6 GPa). No structural phase transitions have been observed. At ∼1.5-2 GPa, cell parameters b and c become accidentally equal to each other, but the space-group symmetry does not change. There is no phase transition between 1.7 and 2.3 GPa, contrary to what has been reported earlier [Belo et al. (2010). Vibr. Spectrosc. 54, 107-111]. The presence of the second phase transition, which was claimed to appear within the pressure range from 6.0 to 7.3 GPa (Belo et al., 2010), is also argued. The changes in the Raman spectra have been shown to be continuous in all the pressure ranges studied.

langue originaleAnglais
Pages (de - à)412-423
Nombre de pages12
journalActa Crystallographica. Section B: Structural Science
Volume68
Numéro de publication4
Les DOIs
étatPublié - août 2012
Modification externeOui

Empreinte digitale

Phase Transition
X-Ray Diffraction
Alanine
Phase transitions
Pressure
X ray diffraction
Powder Diffraction
Raman Spectrum Analysis
X ray powder diffraction
Raman spectroscopy
Raman scattering
Single crystals

Citer ceci

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title = "X-ray diffraction and Raman study of dl-alanine at high pressure: Revision of phase transitions",
abstract = "The effect of pressure on dl-alanine has been studied by X-ray powder diffraction (up to 8.3 GPa), single-crystal X-ray diffraction and Raman spectroscopy (up to ∼6 GPa). No structural phase transitions have been observed. At ∼1.5-2 GPa, cell parameters b and c become accidentally equal to each other, but the space-group symmetry does not change. There is no phase transition between 1.7 and 2.3 GPa, contrary to what has been reported earlier [Belo et al. (2010). Vibr. Spectrosc. 54, 107-111]. The presence of the second phase transition, which was claimed to appear within the pressure range from 6.0 to 7.3 GPa (Belo et al., 2010), is also argued. The changes in the Raman spectra have been shown to be continuous in all the pressure ranges studied.",
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X-ray diffraction and Raman study of dl-alanine at high pressure : Revision of phase transitions. / Tumanov, Nikolay A.; Boldyreva, Elena V.

Dans: Acta Crystallographica. Section B: Structural Science, Vol 68, Numéro 4, 08.2012, p. 412-423.

Résultats de recherche: Contribution à un journal/une revueArticle

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T2 - Revision of phase transitions

AU - Tumanov, Nikolay A.

AU - Boldyreva, Elena V.

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KW - X-ray powder diffraction

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