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  • Chem Sci Trans., 2017, 6(2),  pp 288-292  

    DOI:10.7598/cst2017.1318

    Research Article

    Effect of Electric Field on Dielectric Constant and Loss Tangent in ADP Crystal

  • DEEPAK JOSHI* and TRILOK CHANDRA UPADHYAY
  • Physics Department, H.N.B. Garhwal University (A Central University), Srinagar (Garhwal) Uttarakhand- 246174, India
  • Abstract

    A four sublattice pseudospin lattice coupled mode model modified with third and fourth-order phonon anharmonic interaction terms and external electric field terms has been considered for ADP crystal. Expressions for shift, width, renormalized antiferroelectric mode frequency, dielectric constant and loss tangent have been evaluated. Double-time thermal Green's function method has been used for derivation. Fitting the values of model parameters in expressions, the temperature dependences of antiferroelectric mode frequency dielectric constant and loss tangent have been calculated in presence of electric field. Theoretical results agree with experimental data by others.

    Keywords

    Antiferroelectrics, Anharmonic interactions, Green Function, Electric field

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