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Embedding Ba Monolayers and Bilayers in Boron Carbide Nanowires
Zhiyang Yu1,2, Jian Luo3, Baiou Shi4
1Beijing National Center for Electron Microscopy, School of Materials Science and Engineering, The State Key Laboratory of New Ceramics and Fine Processing, Laboratory of Advanced Materials (MOE), Tsinghua University, Beijing 100084, China.
Scientific Reports
|November 27, 2015
Summary
Barium dopants form surface films on boron carbide nanowires, embedding within crystals during growth. This study reveals dopants incorporated into perfect crystals, beyond bulk solubility, potentially creating unique material properties.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Chemistry
Background:
- Controlling dopant distribution is crucial for tailoring material properties.
- Previous studies indicated dopants segregate at crystal defects like stacking faults.
- Understanding dopant incorporation mechanisms in nanowires is essential for advanced materials.
Purpose of the Study:
- To investigate the distribution and behavior of barium dopants in boron carbide nanowires.
- To explore novel mechanisms of dopant incorporation beyond traditional defect segregation.
- To understand how dopants influence the structure and properties of boron carbide nanowires.
Main Methods:
- Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) was utilized.
- Detailed analysis of dopant distribution at surfaces and within the nanowire interiors.
- Characterization of dopant-induced structural modifications and complexions.
Main Results:
- Barium dopants formed nanometer-thick surface films on boron-rich crystals.
- These surface complexions were embedded within the nanowires during growth, forming ordered monolayer and bilayer structures.
- A novel form of bilayer complexion stabilized at stacking faults was identified.
- Dopants were incorporated into perfect crystal segments, independent of twin boundaries or stacking faults.
- Non-equilibrium incorporation of barium dopants, exceeding bulk solubility, was observed.
Conclusions:
- This research uncovers a previously unrecognized pathway for dopant incorporation in nanowires.
- The findings challenge existing models of dopant segregation at defects.
- The non-equilibrium incorporation of barium suggests potential for novel electronic and physical properties in boron carbide nanowires.
