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  • Chem Sci Trans., 2016, 5(3),  pp 720-726  

    DOI:10.7598/cst2016.1206

    Research Article

    Temperature Dependence of Dielectric Constant and Loss Tangent in Methyl Ammonium Aluminium Alum

  • ARVIND KUMAR RAWAT, AANCHAL RAWAT and TRILOK CHANDRA UPADHYAY
  • Physics Department, H.N.B. Garhwal University, Srinagar (Garhwal) U.K-246174, India
  • Abstract

    The ferroelectric phase transition of MASD alum was studied by model of pseudospin-lattice coupled mode which has been modified by including cubic and quartic phonon anharmonic interaction terms. With the help of double-time temperature dependent Green?s function method and modified Hamiltonian, expressions for dielectric constant, soft mode frequency and loss tangent has been evaluated. By fitting model values of physical quantities in the theoretical expressions, temperature dependence of dielectrc, soft mode frequency and loss tangent have been obtained and compared with literature values which shows a good agreement.

    Keywords

    Green?s function, Dielectric constant, Anharmonic interactions, Loss tangent

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