• Gyrotropic and piezoelectric coefficients and attenuation of elastic waves in BaTiO3

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    • Keywords


      Gyrotropic and piezoelectric coefficients; attenuation; elastic waves; phase transition

    • Abstract


      Using Landau theory of phase transition, expressions for gyrotropic coefficients and piezoelectric coefficients are obtained for barium titanate in the tetragonal phase. Both coefficients vanish at the ferroelectric phase transition temperature. The piezoelectric coefficients tallied with the literature values. The attenuation coefficients for elastic waves propagating along the principal directions in tetragonal, orthorhombic and rhombohedral phases are derived based on Landau theory. It is predicted that there will be slight amplification for both longitudinal and transverse modes in the rhombohedral phase at a temperature close to the rhombohedral phase transition temperature.

    • Author Affiliations


      B Subramanyam1

      1. Department of Physics, Indian Institute of Technology, Madras - 600 036, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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