Document Detail


X-ray diffraction and Raman study of DL-alanine at high pressure: revision of phase transitions.
MedLine Citation:
PMID:  22810911     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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.
Authors:
Nikolay A Tumanov; Elena V Boldyreva
Publication Detail:
Type:  Journal Article     Date:  2012-07-17
Journal Detail:
Title:  Acta crystallographica. Section B, Structural science     Volume:  68     ISSN:  1600-5740     ISO Abbreviation:  Acta Crystallogr., B     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-07-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8403252     Medline TA:  Acta Crystallogr B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  412-23     Citation Subset:  IM    
Affiliation:
Institute of Solid State Chemistry and Mechanochemistry SB RAS, Kutateladze 18, Novosibirsk 630128, Russian Federation.
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