Temperature Dependence of Permittivity and Dissipation Factor of Potassium Dihydrogen Arsenate Crystal using Green Function Formalism
2023 Third International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT)（2023）
Abstract
Potassium Dihydrogen Arsenate(KDA)crystal is a ferroelectric crystal[1]. Earlier model Hamiltonian is modified with addition of phonon anharmonic, extra spin-lattice, four spin coupling and external electric field terms. Employing Zubarev's Green function formalism[2] formulae for ferroelectric mode frequency, permittivity and dissipation factor are derived. Model values for KDA crystal are fitted and thermal variations of ferroelectric mode frequency, dielectric constant and loss tangent are obtained. Theoretical variations are compared with experimental results for KDA crystal reported by others.
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Key words
Ferroelectric,Dielectric,Green function,Soft mode frequency,permittivity,dissipation factor
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