Publication: FT-Raman and infrared spectroscopic study of
aragonite-strontianite (CaxSr1-xC03) solid solution
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Publication Date
1997
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Elsevier Science B.V.,
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Abstract
Synthetic aragonite-strontianite solid-solution samples have been studied using dispersive IR and FT-Raman
spectroscopy. In addition to the end-members, nine samples over a range of composition from Ca0,9Sr0,1CO3 to
Ca0,1Sr0,9CO3 were analysed. Carbonate anion internal modes are examined in detail by means of band-shape analysis
and component fitting procedures. Positional disorder induced by the random cationic substitution results in strong
increase of the halfwidth in several vibrational bands. Results obtained for the doubly degenerate modes (antisymmetric
stretching and bending, v3 and v4) reveal the presence of three components both in the IR antisymmetric stretching
band as well as in the Raman antisymmetric bending band. These observations are interpreted in terms of an overtone
2v4 in possible Fermi resonance with the corresponding vg fundamental in the IR spectra, and the presence of
Davidov (factor group) splitting in the FT-Raman v4 band. Lattice modes in the FT-Raman spectra demonstrate
weaker cohesion between the cation/carbonate/cation layers in aragonite (synth) than in strontianite (synth).