Dielectric properties of ammonium iron sulphate-dodecahydrate alum crystal

Authors

  • Muzaffar Iqbal Khan Department of Physics, Baba Ghulam Shah Badshah University Rajouri (Jammu and Kashmir)-185234, India https://orcid.org/0000-0002-1305-7394

DOI:

https://doi.org/10.37256/mp.1120221789

Keywords:

Green function, phonon anharmonic interactions, dielectric loss

Abstract

The statistical Green function theory and extended two sublattice pseudospin coupled-mode model Hamiltonian. The modified model summing with phonon anharmonic couplings, extra spin-lattice couplings, direct spin-spin coupling together with an applied electric field has been used to explain the dielectric properties of ammonium iron alum crystal. The expressions for energy shift, linewidth, ferroelectric soft mode frequency, dielectric permittivity, and dielectric loss tangent are derived. By fitted the model values of different parameters in the above theoretical expressions. The temperature dependence of soft mode frequency, dielectric permittivity, and dielectric loss properties have been numerically calculated. Our theoretical obtained results compared well agreement with experimental results reported by others.

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Published

2022-11-08

How to Cite

(1)
Muzaffar Iqbal Khan. Dielectric Properties of Ammonium Iron Sulphate-Dodecahydrate Alum Crystal. Mater. Plus 2022, 1, 21-37.