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Interfacial superstructures and chemical bonding transitions at metal-ceramic interfaces
Can Yang1, Chongze Hu2, Congying Xiang1
1State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, P. R. China.
This study reveals how metal and ceramic materials bond at interfaces. Specific solute elements create unique structures that enable a transition from covalent to metallic bonding, enhancing material properties.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Surface Science
Background:
- Metal-ceramic interfaces are crucial in many technologies but the bonding transition remains unclear.
- Solute segregation and structural changes at these interfaces are poorly understood.
Purpose of the Study:
- To investigate the atomic structure and chemical bonding at metal-ceramic interfaces.
- To understand the role of solute segregation in interfacial transitions.
Main Methods:
- Aberration-corrected electron microscopy.
- Atomic-resolution energy-dispersive X-ray spectroscopy (EDS).
- Electron energy loss spectroscopy (EELS).
- Density functional theory (DFT) calculations.
Main Results:
- Anisotropic formation of trilayer-like superstructures at WC-Co interfaces with Ti, V, and Cr.
- Segregant-specific compositional profiles were observed.
- These structures facilitate a transition from covalent to metallic electronic structures.
Conclusions:
- The study uncovers detailed interfacial superstructures at metal-ceramic interfaces.
- Solute segregation plays a key role in the transition of chemical bonding character.
- Understanding these mechanisms is vital for designing advanced materials.
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