Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 45, Pages 18599-18605Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja308490a
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Funding
- China 973 Program [2011CB808200]
- Natural Science Foundation of China [11274136, 11104104, 11025418, 91022029]
- Changjiang Scholars Program of China, Changjiang Scholar and Innovative Research Team in University [IRT1132]
- Key Laboratory of Surface Physics and Chemistry [SPC201103]
- ConvEne-IGERT Program [NSF-DGE0801627]
- MRSEC program [NSF-DMR1121053]
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High pressure can fundamentally alter the bonding patterns of light elements and their compounds, leading to the unexpected formation of materials with Unusual chemical and physical properties. Using an unbiased structure search method based on particle swarm optimization algorithms in combination with density functional theory calculations, we investigate the phase stabilities and structural changes of various Li-B systems on the Li-rich regime under high pressures. We identify the formation of four stoichiometric :lithium borides (Li3B2, Li2B, Li4B, and Li6B) having unforeseen structural features that might be experimentally synthesizable over a wide range of pressures. Strikingly, it is found that the B-B bonding patterns of these lithium borides evolve from graphite like sheets in turn to zigzag chains, dimers, and eventually isolated B ions with increasing Li content. These intriguing B-B bonding features are chemically rationalized by the elevated B anionic charges as a result of Li-B charge transfer.
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