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Elsevier, Physica B: Condensed Matter, 18(407), p. 3781-3789, 2012

DOI: 10.1016/j.physb.2012.05.061

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High pressure monoclinic phases of Sb2Te3

Journal article published in 2012 by S. M. Souza, C. M. Poffo ORCID, D. M. Trichês, J. C. de Lima, T. A. Grandi, A. Polian, M. Gauthier
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The effectofpressureonnanostructuredrhombohedral a-Sb2Te3 (phase I)wasinvestigatedusingX-ray diffraction(XRD)andRamanspectroscopy(RS)upto19.2and25.5GPa,respectively.XRDpatterns showedtwonewhighpressurephases(namedphasesIIandIII).FromaRietveldrefinementofXRD patternsof a-Sb2Te3, theunitcellvolumeasafunctionofpressurewasobtainedandthevalueswere fitted toaBirch-Murnaghanequationofstate(BM-EOS).Thebestfitwasobtainedforbulkmodulus B0¼36.170.9GPaanditsderivative B0 0 ¼ 6:270:4 (notfixed).Usingtherefinedstructuraldatafor a-Sb2Te3, forpressuresupto9.8GPa,changesintheangleofsuccession[Te-Sb-Te-Sb-Te],inthe interaromicdistancesofSbandTeatomsbelongingtothisangleofsuccessionandintheinteratomic distancesofatomslocatedonthe c axiswereexamined.Thisanalysisrevealedanelectronictopological transition(ETT)alongthe a and c axes atcloseto3.7GPa.FromtheRSspectra,thefullwidthsathalf maximum(FWHM)oftheRamanactivemodesof a-Sb2Te3 were plottedasfunctionsofpressureand showedanETTalongthe a and c axes atcloseto3.2GPa.TheXRDpatternsofphasesIIandIIIwerewell reproducedassuming b-Bi2Te3 and g-Bi2Te3 structuressimilartothosereportedintheliteraturefor a-Bi2Te3.