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Optical constants and vibrational behavior of (NH4)2ZnBr4 crystals

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Abstract

Far-infrared reflectivity of ammonium tetrabromozincate crystals has been measured at 300 and 105 K in the range 50–500 cm−1. The low-temperature measurements are made in the ferroelectric state of the crystal. Optical constants and frequencies of optical phonon modes have been evaluated by means of a three-parameter classical oscillator fit to the reflectivity data. Absorption spectra of polycrystalline samples have been measured in FIR and NIR regions. A vibrational assignment of the observed frequencies is given. It is suggested that the ferroelectric transition is most likely of the displacive type.

© 1991 Optical Society of America

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