Infrared Reflectivity Spectrum and Lattice Vibration of Spinel-Type Compound HgIn₂S₄

Abstract

Indium thiospinel compound with normal spinel structure HgIn 2 S 4 single crystal was synthesized by the Bridgman method, and far-infrared reflection and transmission spectra were measured in the wavelength region from 20 to 1000 cm -1 . The dispersion parameters are calculated by dispersion analysis using classical oscillators. The strength of the four kinds of short-range force constant is calculated using the dynamical matrices proposed by Bruesch et al. , and the effective charges for each ion are obtained under several assumptions.