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Metal-nonmetal transition in the boron group elements.
U Häussermann1, S I Simak, R Ahuja
1Department of Inorganic Chemistry, Stockholm University, S-10691 Stockholm, Sweden.
Physical Review Letters
|March 14, 2003
Summary
Computational studies reveal boron may transform from alpha-B to alpha-Ga at 74 GPa, indicating a nonmetal-metal transition. New elemental modifications for aluminum and gallium, similar to alpha-boron, are energetically feasible, especially in nanoscale systems.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Computational Chemistry
Background:
- Boron group elements (B, Al, Ga) exhibit complex structural behaviors.
- Understanding pressure-induced phase transitions is crucial for materials science.
- Ab initio calculations provide insights into elemental structures and properties.
Purpose of the Study:
- To investigate structural competition in boron group elements.
- To predict pressure-induced phase transitions in boron.
- To explore novel elemental modifications for Al and Ga.
Main Methods:
- Utilizing first-principles (ab initio) computational methods.
- Performing density functional theory (DFT) calculations.
- Analyzing structural stability and energy differences under pressure.
Main Results:
- Predicted a structural phase transition in boron (alpha-B to alpha-Ga) at approximately 74 GPa.
- Observed a nonmetal-to-metal transition accompanying the boron structural change.
- Identified icosahedral boron-like structures for Al and Ga as energetically accessible, only slightly higher than their ground states.
Conclusions:
- The predicted boron phase transition and nonmetal-metal transition are significant findings.
- The low energy difference for Ga suggests experimental realization of new modifications is feasible.
- Nanoscale systems may offer pathways to stabilize these novel elemental structures for Al and Ga.