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Materials 2016, 9(11), 902; doi:10.3390/ma9110902

Pressure-Induced Phase Transition and Mechanical Properties of Mg2Sr Intermetallics

1
College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China
2
Department of Computer Science, Baoji University of Arts and Sciences, Baoji 721016, China
3
College of Physics and Optoelectronics Technology, Nonlinear Research Institute, Baoji University of Arts and Sciences, Baoji 721016, China
*
Author to whom correspondence should be addressed.
Academic Editor: Marco Salerno
Received: 15 September 2016 / Revised: 31 October 2016 / Accepted: 2 November 2016 / Published: 8 November 2016
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

A pressure-induced phase transition of Mg2Sr intermetallics from the low-pressure C14-type phase to an orthorhombic phase (space group Cmcm, Z = 4) at a high pressure of 21.0 GPa was firstly predicted using first-principles calculations combined with unbiased swarm structure searching techniques. The phase transition was identified as a first-order nature with a volume drop of 4.7%, driven by the softening of elastic behavior at high pressure. Further phonon calculations indicate that the newly predicted orthorhombic phase is dynamically stable at high pressure and ambient pressure. The mechanical properties including the elastic anisotropy of this orthorhombic phase were thus fully studied at ambient pressure. The elastic anisotropy behavior of this orthorhombic phase was investigated by the distributions of elastic moduli. The evidence of the bonding nature of Mg–Sr was also manifested by density of states (DOS) and electronic localization function (ELF) calculations. View Full-Text
Keywords: intermetallics; phase transition; elastic anisotropy; electronic structure intermetallics; phase transition; elastic anisotropy; electronic structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yan, H.; Han, X.; Zheng, B. Pressure-Induced Phase Transition and Mechanical Properties of Mg2Sr Intermetallics. Materials 2016, 9, 902.

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