Volume 24 Issue 2
Apr 2015
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HAO Ai-Min, YANG Xiao-Cui, ZHAO Yu-Wei, LIU Xin, SONG Ai-Jun, ZHANG Wei-Guo, XIN Wei. Structural Stabilities and Optical Properties of BaX (X=S, Se and Te) under High Pressure[J]. Chinese Journal of High Pressure Physics, 2010, 24(2): 113-119 . doi: 10.11858/gywlxb.2010.02.006
Citation: HAO Ai-Min, YANG Xiao-Cui, ZHAO Yu-Wei, LIU Xin, SONG Ai-Jun, ZHANG Wei-Guo, XIN Wei. Structural Stabilities and Optical Properties of BaX (X=S, Se and Te) under High Pressure[J]. Chinese Journal of High Pressure Physics, 2010, 24(2): 113-119 . doi: 10.11858/gywlxb.2010.02.006

Structural Stabilities and Optical Properties of BaX (X=S, Se and Te) under High Pressure

doi: 10.11858/gywlxb.2010.02.006
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  • Corresponding author: HAO Ai-Min
  • Received Date: 10 Apr 2009
  • Rev Recd Date: 17 Aug 2009
  • Publish Date: 15 Apr 2010
  • An investigation on the structural stabilities and optical properties of BaX (X=S, Se and Te) under high pressure was conducted using first-principles calculations based on density functional theory. The results show that the sequence of the pressure-induced phase transition of these compounds is from the NaCl-type (B1) to the CsCl-type (B2) structure. The structural transition pressure and the metallization pressure are 8.57 and 45.4 GPa for BaS, 7.44 and 36.5 GPa for BaSe, 5.67 and 16.7 GPa for BaTe, respectively. The calculation of the optical properties showed that almost all peaks of the imaginary part of dielectric constant (2) in the B1 and B2 structures shift towards high-energy region with increasing pressure (blue shift), and the static dielectric constant increases as the pressure increases.

     

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