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6Li-7Li isotopic shifts in the infrared spectrum of inorganic lithium compounds—II:Rhombohedral LiXO 2 compounds

Authors
Journal
Spectrochimica Acta Part A Molecular Spectroscopy
0584-8539
Publisher
Elsevier
Publication Date
Volume
26
Issue
4
Identifiers
DOI: 10.1016/0584-8539(70)80271-9
Disciplines
  • Physics

Abstract

Abstract The infrared spectrum of some LiX IIIO 2 compounds (X III = Al, Ga, Co, Cr, Rh, Sc) with an ordered distribution of Li and X III cations on octahedral sites has been investigated with the help of 6Li- 7Li isotopic replacement. The spectrum is essentially characterized by the occurrence of distinct, well individualized, X IIIO 6 (in the 650–400 cm −1 region) and LiO 6 (in the 300–200 cm −1 region) frequencies. However, this vibrational behaviour seems to be restricted to the compounds with the rhombohedral R3̄ m structure and cannot be generalized to all LiXO 2 compounds. Some specific features of the individual spectra have also been discussed.

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