Pressure Effects in Phonon Modes and Structure of AIIB2IIIC4IV Compounds and Combinations

Authors: Tatsi A.¹; Lampakis D.¹; Liarokapis E.¹; Lopez S.A.²; Martinez L.²; Giriat W.²

Source: International Journal of High Pressure Research, Volume 22, Number 1, 1 January 2002 , pp. 89-93(5)

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Abstract:

A^IIB₂^IIIC₄^VI compounds have been prepared with A^II=Zn, Cd, Mn, B^III=In, and C^VI=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 Zn_0.6Mn_0.4In₂S₄ compound show a sudden modification in the frequency dependence on pressure above sim

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.

Keywords: Raman spectroscopy; High pressure; Phonons

Document Type: Research article

Affiliations: 1: Physics Department, National Technical University, Zografou Campus, 15780 Athens, Greece; Fax: (++301) 772 2928; E-mail: eliaro@central.ntua.gr 2: University of los Andes, Merida, Venezuela

Publication date: 2002-01-01

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