Raman study of temperature dependence of lattice modes in calcite

Sood, A. K. ; Arora, A. K. ; Umadevi, V. ; Venkataraman, G. (1981) Raman study of temperature dependence of lattice modes in calcite Pramana - Journal of Physics, 16 (1). pp. 1-16. ISSN 0304-4289

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Official URL: http://www.ias.ac.in/j_archive/pramana/16/1/1-16/v...

Related URL: http://dx.doi.org/10.1007/BF02847889


The temperature dependence of the line width and the peak position of the Eg librational mode (of nominal frequency 285 cm−1) and the Eg translational mode (of nominal frequency 155 cm−1) in calcite (CaCO3) have been studied by laser-Raman spectrometry. The role of orientational relaxation as a possible process contributing to the line width has been evaluated. It is concluded that reorientations do not play a major part in relation to the present observations. It is further shown that the latter can be understood on the basis of cubic and quartic anharmonic processes. The data also suggest that certain phonon interactions earlier considered insignificant for peak shift in calcite, do contribute significantly.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Laser Raman Spectroscopy; External Modes; Librations; Calclite; Anharmonicity; Line Widths; Temperature Dependence; Lattice Modes
ID Code:50294
Deposited On:22 Jul 2011 13:36
Last Modified:18 May 2016 04:38

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