• M L Bansal

      Articles written in Pramana – Journal of Physics

    • Raman scattering study of LiKSO4—phases II and III

      M L Bansal S K Deb A P Roy V C Sahni

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      Detailed Raman scattering investigation of LiKSO4 in phases II and III across the transition temperatureTc ≃ 700 K is reported. Abrupt change in frequency and line width of the external and internal modes have been observed. Analysis of the results suggests lithium positional disorder and sulphate orientational disorder in the high temperature phase (II). The results also throw some light on the existence of twin domains in the crystal.

    • Universal scaling law for first order phase transformation: LiKSO4

      M L Bansal A P Roy

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      We have measured the kinetics of phase transition in LiKSO4 (C66C3v4;Tc∼201 K) by monitoring the time-dependent change in Raman intensity of selected vibrational lines at various temperatures in the transformed phaseC3v4. We find that the observed growth curves for several temperatures display a nearly universal shape when plotted against a suitably scaled time parameter. We interpret our results in terms of a phenomenological model of nucleation and growth.

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