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

Nikolay A. Tumanov, Elena V. Boldyreva

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)412-423
Number of pages12
JournalActa Crystallographica. Section B: Structural Science
Volume68
Issue number4
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Keywords

  • alanine
  • high pressure
  • phase transition
  • Raman spectroscopy
  • X-ray powder diffraction

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