Chin. Phys. Lett.  2009, Vol. 26 Issue (11): 113101    DOI: 10.1088/0256-307X/26/11/113101
ATOMIC AND MOLECULAR PHYSICS |
Synthesizing Metastable Rocksalt-Type MgTe Based on High-Pressure Solid-State Phase Transition: A First-Principles Study
CAI Ying-Xiang1, XU Rui2
1Department of Physics, Nanchang University, Nanchang 3300312State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004
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CAI Ying-Xiang, XU Rui 2009 Chin. Phys. Lett. 26 113101
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Abstract The controllability of pressure-induced structural transformation in the hexagonal wurtzite-type MgTe is studied by a first-principles pseudopotential method within the generalized gradient approximation (GGA). Based on the transitional mechanisms of the wurtzite → NiAs and the wurtzite → rocksalt, a special method of loading biaxial pressure on the (010) and (001) planes of an orthorhombic cell is designed. At equal biaxial pressure of 2.75GPa, an abrupt volume collapse is found and the WZ phase transforms into an orthorhombic phase with a tiny distortion. While the pressure decreases to zero, three lattice parameters a, b and c become equal and a metastable rocksalt-type MgTe is obtained.
Keywords: 31.15.Es      64.70.K-      81.40.Vw     
Received: 03 April 2009      Published: 30 October 2009
PACS:  31.15.es (Applications of density-functional theory (e.g., to electronic structure and stability; defect formation; dielectric properties, susceptibilities; viscoelastic coefficients; Rydberg transition frequencies))  
  64.70.K-  
  81.40.Vw (Pressure treatment)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/11/113101       OR      https://cpl.iphy.ac.cn/Y2009/V26/I11/113101
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