Zhang, M. and Putnis, A. and Salje, E. K. H. (2006) Infrared spectroscopy of superionic conductor LiNaSO4: Vibrational modes and thermodynamics. Solid State Ionics, 177 (1-2). pp. 37-43. DOI https://doi.org/10.1016/j.ssi.2005.10.001
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Abstract
Infrared active phonon spectra of lithium sodium sulphate, LiNaSO4, were studied at temperatures between 20 K and 780 K. Dielectric constant [ε = ε′ + iε″] and energy loss function [− Im(1/ε)] were obtained from Kramers–Kronig analysis. Our IR data show a more complete set of vibrational modes than previous investigations. The IR data of LiNaSO4 at 20 K are consistent with the P31c symmetry, indicating that LiNaSO4 shows no structural phase transitions between 20 K and 300 K, in contrast to LiKSO4. On heating from 20 K, phonon modes related to Li and Na vibrations show a dramatic line broadening and decrease in intensity. An extra mode is recorded near 380 cm− 1 at 500 K. The absorption shows a systematic increase in intensity on further heating. These changes are attributed to anharmonic effects and Li diffusion or hopping. Dramatic spectral changes in the internal modes occur near 620 K on heating, suggesting the onset of the rotational disorder of SO4 tetrahedra, but the Li atom spectrum shows weak response to the rotational disorder.
Item Type: | Article |
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Uncontrolled Keywords: | 2006 AREP IA49 IA50 2006 P |
Subjects: | 03 - Mineral Sciences |
Divisions: | 03 - Mineral Sciences |
Journal or Publication Title: | Solid State Ionics |
Volume: | 177 |
Page Range: | pp. 37-43 |
Identification Number: | https://doi.org/10.1016/j.ssi.2005.10.001 |
Depositing User: | Sarah Humbert |
Date Deposited: | 16 Feb 2009 13:04 |
Last Modified: | 23 Jul 2013 09:54 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/834 |
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