Abstract
An extended two sublattice pseudospin lattice coupled mode model by adding third and fourth order phonon an harmonic interaction terms as well as external electric field term is considered for (CH2NH2COOH)3 H2SO4 crystal. With the help of double‐time temperature dependent green's function method expression for shift width, soft mode frequency, dielectric constant loss tangent and Acoustic attenuation are derived. By fitting model values in the theoretical expressions. Temperature and electric field dependence of soft mode frequency, dielectric constant and loss tangent are calculated. The theoretical result compare well with experimental results of Bye et al [ferroelectrics, 4(1972)253].
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