New pressure-induced monoclinic {\beta}-Sb2Te3 phase with sevenfold symmetry

Sergio Michielon de Souza; Daniela Menegon Trichês; Claudio Michel Poffo; João Cardoso de Lima; Tarciso Antonio Grandi; Alain Polian; Michel Gauthier

New pressure-induced monoclinic {\beta}-Sb2Te3 phase with sevenfold symmetry

Materials Science 2011-05-06 v1

Authors: Sergio Michielon de Souza , Daniela Menegon Trichês , Claudio Michel Poffo , João Cardoso de Lima , Tarciso Antonio Grandi , Alain Polian , Michel Gauthier

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Abstract

A nanometric Sb2Te3 rhombohedral phase was produced from Sb and Te by mechanical alloying for 3 hours and its structural stability was studied by synchrotron X-ray diffraction (XRD) and Raman spectroscopy (RS) measurements as a function of pressure. A phase transformation from the ambient pressure rhombohedral phase into a {\beta}-Sb2Te3 monoclinic structure between 9.8 and 13.2 GPa is observed by XRD. This phase transformation is confirmed by the Raman spectroscopy measurements. The pressure dependence of the volume fited to a Birch-Murnaghan equation of state gives a bulk modulus B0 = 40.6 +- 1.5 GPa and B'0 = 5.1 +- 0.6. The bulk modulus of the nano-Sb2Te3 seems to be slightly smaller than that for its bulk counterpart (44.8 GPa).

Keywords

Sb2Te3 pressure-induced phase transformation monoclinic β-Sb2Te3 sevenfold symmetry synchrotron X-ray diffraction Raman spectroscopy bulk modulus

Cite

@article{arxiv.1105.1097,
  title  = {New pressure-induced monoclinic {\beta}-Sb2Te3 phase with sevenfold symmetry},
  author = {Sergio Michielon de Souza and Daniela Menegon Trichês and Claudio Michel Poffo and João Cardoso de Lima and Tarciso Antonio Grandi and Alain Polian and Michel Gauthier},
  journal= {arXiv preprint arXiv:1105.1097},
  year   = {2011}
}

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25 pages, one Table and eight figures

New pressure-induced monoclinic {\beta}-Sb2Te3 phase with sevenfold symmetry

Abstract

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