OPTICAL-CONSTANTS AND VIBRATIONAL BEHAVIOR OF (NH4)2ZNBR4 CRYSTALS

被引：0

作者：

SRIVASTAVA, JP

KULSHRESHTHA, A

RAUH, H

机构：

[1] Department of Physics, Aligarth Muslim University, Aligarh

[2] Akasaka, Toyko, 132, New Hoechst Building, 8-10-16, PO. Box

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 1991年 / 8卷 / 11期

关键词：

D O I：

10.1364/JOSAB.8.002379

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

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页码：2379 / 2383

页数：5

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