X-ray and temperature polarized Raman spectroscopic characterization of
the LiNa3(SO4)(2)center dot 6H(2)O crystal
JOURNAL OF RAMAN SPECTROSCOPY, 30 (4):
289-294 (1999)DOI: 10.1002/(SICI)1097-4555(199904)30:4<289::AID-JRS375>3.0.CO;2-F
Аннотация
Results of x-ray diffraction and polarized Raman studies of hexahydrated
lithium sodium sulfate, LiNa3(SO4)(2). 6H(2)O (LNSW), are reported.
X-ray diffraction data show that at room temperature LNSW has a trigonal
structure belonging to space group C-3v(6) with six molecules per unit
cell. Temperature-dependent first-order Raman light studies in the range
12-300 K were carried out in order to investigate the phonon spectra of
LNSW in relation to the phase transition in the crystal. Complete
spectra were obtained for geometries allowing the observation of A(1)
and E species. Careful analysis of the spectra shows that the observed
Raman modes do not exhibit variations in either wavenumber or intensity,
or both, with temperature of the crystal, indicating that the C-3v(6)
phase at 300 K does not undergo a transition in the temperature range
investigated. Data from Raman measurements taken at 12 K were used to
propose an assignment of the fundamental modes on the basis of water
group vibrations and correlations with previous data reported for other
crystals belonging to the double sulfate family. Copyright (C) 1999 John
Wiley & Sons, Ltd.