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Title: Novel superconducting structures of BH2 under high pressure

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C9CP00310J· OSTI ID:1506102
 [1]; ORCiD logo [2];  [1];  [1];  [1];  [3];  [3]
  1. Qingdao Univ., Qingdao (People's Republic of China)
  2. Qingdao Univ., Qingdao (People's Republic of China); Jilin Univ., Jilin (People's Republic of China)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States)

The crystal structures of boron hydrides in a pressure range of 50–400 GPa were studied using the genetic algorithm (GA) method combined with first-principles density functional theory calculations. BH4 and BH5 are predicted to be thermodynamically unstable. Two new BH2 structures with Cmcm and C2/c space group symmetries, respectively, were predicted, in which the B atoms tend to form two-dimensional sheets. The calculated band structures showed that in the pressure range of 50–150 GPa, the Cmcm-BH2 phase has very small gaps, while the C2/c-BH2 phase at 200–400 GPa is metallic. In conclusion, the superconductivity of the C2/c-BH2 structure was also investigated, and electron–phonon coupling calculations revealed that the estimated Tc values of C2/c-BH2 are about 28.18–37.31 K at 250 GPa.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1506102
Report Number(s):
IS-J-9917; PPCPFQ
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 21, Issue 10; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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