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Temperature dependence of the low-frequency reflectance spectrum of a sodium nitrate single crystal: Effect of the phase transition on the lattice modes parameters

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Conclusion

Reflectivity of a single crystal sodium nitrate have been measured as a fonction of temperature and crystallographic orientations over a frequency region which spans all infrared active lattice modes. The data have been fitted with a series of five independent oscillators and an overdamped oscillator of A2u symmetry at temperatures between 250 and 276°C. None of them behaves as a soft mode. Our measurements show also the influence of the phase transition on the lattice modes parameters.

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  1. Laboratoire Infrarouge Lointain, E.R.A., C.N.R.S. no 14, Université de Nancy I, C.O. no 140, 54037, Nancy Cedex, France

    F. Brehat, B. Wyncke & A. Hadni

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  1. F. Brehat
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  2. B. Wyncke
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  3. A. Hadni
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Brehat, F., Wyncke, B. & Hadni, A. Temperature dependence of the low-frequency reflectance spectrum of a sodium nitrate single crystal: Effect of the phase transition on the lattice modes parameters. Int J Infrared Milli Waves 2, 333–345 (1981). https://doi.org/10.1007/BF01007038

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  • DOI: https://doi.org/10.1007/BF01007038

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