Pressure Effects in Phonon Modes and Structure of AIIB2IIIC4IV Compounds and Combinations
Source: International Journal of High Pressure Research, Volume 22, Number 1, 1 January 2002 , pp. 89-93(5)
Publisher: Taylor and Francis Ltd
Abstract:AIIB2IIIC4VI compounds have been prepared with AII=Zn, Cd, Mn, BIII=In, and CVI=S, Se. These atomic substitutions induce modifications in the structure and frequency for some of the phonons. These compounds have been studied by Raman spectroscopy at ambient conditions and under hydrostatic pressures. All phonons appear in the spectral region below 400 cm-1. High-pressure measurements have shown the existence of soft modes. New modes seem to appear at high pressures due to the phonon splitting. All low frequency phonons of the Zn0.6Mn0.4In2S4 compound show a sudden modification in the frequency dependence on pressure above 2 GPa. Based on the Raman results we propose an assignment for the modes and try to extract information about the structure and the possible phase transitions.
Document Type: Research article
Affiliations: 1: Physics Department, National Technical University, Zografou Campus, 15780 Athens, Greece; Fax: (++301) 772 2928; E-mail: email@example.com 2: University of los Andes, Merida, Venezuela
Publication date: 2002-01-01