TY - JOUR
T1 - X-ray diffraction and Raman study of dl-alanine at high pressure
T2 - Revision of phase transitions
AU - Tumanov, Nikolay A.
AU - Boldyreva, Elena V.
PY - 2012/8
Y1 - 2012/8
N2 - 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.
AB - 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.
KW - alanine
KW - high pressure
KW - phase transition
KW - Raman spectroscopy
KW - X-ray powder diffraction
UR - http://www.scopus.com/inward/record.url?scp=84864259284&partnerID=8YFLogxK
U2 - 10.1107/S0108768112028972
DO - 10.1107/S0108768112028972
M3 - Article
C2 - 22810911
AN - SCOPUS:84864259284
SN - 0108-7681
VL - 68
SP - 412
EP - 423
JO - Acta Crystallographica. Section B: Structural Science
JF - Acta Crystallographica. Section B: Structural Science
IS - 4
ER -