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New pressure-induced monoclinic β-Sb2Te3 phase with sevenfold symmetry

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 β-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).

preprint2011arXivOpen access
Sergio Michielon de SouzaDaniela Menegon TrichêsClaudio Michel PoffoJoão Cardoso de LimaTarciso Antonio GrandiAlain PolianMichel Gauthier
cond-mat.mtrl-sci
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Sergio Michielon de SouzaDaniela Menegon TrichêsClaudio Michel PoffoJoão Cardoso de LimaTarciso Antonio GrandiAlain PolianMichel Gauthier

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