Alía, J.M. and Díaz de Mera, Y. and Edwards, H.G.M. and González Martín, Paloma and López Andrés, Sol (1997) FT-Raman and infrared spectroscopic study of aragonite-strontianite (CaxSr1-xC03) solid solution. Spectrochimica Acta Part A, 53 (13). pp. 2347-2362. ISSN 1386-1425
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).
|Uncontrolled Keywords:||FT-Raman; FTIR; Aragonite; Stronitianite; Fundamental modes|
|Subjects:||Sciences > Geology > Crystallography|
|Deposited On:||26 Apr 2010 14:16|
|Last Modified:||01 Sep 2010 12:51|
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