Vibrational studies of lithium-intercalated SnSySe2−y (0≤y≤2) layered compounds |
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Authors: | C Perez-Vicente C Julien |
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Institution: | (1) Laboratoire de Physique des Solides, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 05, France |
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Abstract: | We report the vibrational properties of lithium-intercalated SnSySe2−y (0≤y≤2) layered compounds. Infrared absorption spectra have been recorded as a function of temperature in the frequency range
50–600 cm−1. The new bands are interpreted as vibrational modes of lithium atoms against the nearest-neighbouring-chalcogen atoms located
in the van der Waals gap. Results are analyzed in terms of stretching vibrations of Li-S4 and Li-S6 entities. From a comparison of the spectra, it is concluded that lithium ions are more likely to occupy tetrahedral sites
in the lithium-rich phases. Using a simple model of lattice dynamics, the coupling force constants are determined and compared
with those of the pristine materials.
Paper presented at the 2nd Euroconference on Solid State Ionics, Funchal, Madeira, Portugal, Sept. 10–16, 1995 |
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