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    • Propagation of longitudinal ultrasonic waves in RbH2PO4 near its ferroelectric phase transition temperature

      G P Singh B K Basu

      Solids Volume 11 Issue 2 August 1978 pp 119-134

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/011/02/0119-0134

    • Keywords

       

      Ferroelectricity; phase transition; ultrasonic attenuation and velocity change; soft mode; RbH2PO4

    • Abstract

       

      Ferroelectric phase transition in RbH2PO4 has been investigated using propagation of longitudinal acoustic waves along the polar axis near the transition temperature. The velocity of this mode is continuous across the transition temperature. Velocity data in the ferroelectric phase are analyzed in terms of coupled soft modeacoustic mode model of Pytte to obtain the temperature dependence of the soft mode frequency. The attenuation data in the ferroelectric phase show power law dependence. It follows scaling behaviour of the type predicted by Kawasaki from the mode-mode coupling theory and the dynamical scaling.

    • Author Affiliations

       

      G P Singh1 B K Basu1

      1. Tata Institute of Fundamental Research, Bombay - 400 005

    • Dates

       
      Published
      August 1978
      Manuscript received
      27 February 1978
      Manuscript revised
      19 May 1978

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