Thermal dependence of soft mode frequency, dielectric constant, and tangent loss in lead hydrogen phosphate (LHP) crystal

Abstract

Ferroelectric materials have promising uses in modulators, infrared detectors, data storage devices, and other circuits. The ferroelectric properties in LHP crystallites are investigated theoretically in the study that followed, with some modifications, including the incorporation of fourth and third-orderphonon anharmonic connections, indirect connections, four-body connections, and electric field terms. We will take into account the PLCM model Hamiltonian. Calculations of soft mode frequency, loss tangent, and dielectric constant for said LHP crystal have been computed by using Green's function methodology. The analysis has been done mathematically by putting numerous model values into theoretical expressions that have been established, as well as thermal perturbations of soft mode frequency, Tangent loss (dielectric loss) and dielectric constant have been established. The findings of this study for the LHP crystal are quite well consistent with Negran et al studies of experimental data.