Reactive multilayers examined by HRTEM and plasmon EELS chemical mapping.
1Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, UK. m.azizi@sheffield.ac.uk
Summary
This study maps chemical phases in copper-aluminum (Cu-Al) multilayer systems using electron energy loss spectroscopy. Sharply bound epitaxial phases were identified, demonstrating the technique
Area of Science:
- Materials Science
- Solid State Physics
- Analytical Chemistry
Background:
- Copper-aluminum (Cu-Al) multilayer systems are crucial in various applications.
- Understanding the reaction phases within these systems is vital for optimizing their properties.
- Characterizing nanoscale phase evolution requires advanced analytical techniques.
Purpose of the Study:
- To chemically map reaction phases in Cu-Al multilayer systems.
- To investigate the sensitivity of plasmon peak characteristics to crystal structures and phases.
- To analyze the orientation relationships at interfaces within the multilayer system.
Main Methods:
- Low-loss electron energy loss spectroscopy (EELS) spectrum imaging and image spectroscopy.
- Postprocessing of EELS spectra to generate second derivative plasmon maps and line scans.
- High-resolution electron microscopy (HREM) and selected area diffraction (SAD) for interface and orientation analysis.
Main Results:
- Successfully applied EELS spectrum imaging and image spectroscopy to Cu-Al multilayer samples.
- Identified sharply bound epitaxial phases within the Cu-Al system.
- Observed these phases both before and after heat treatment, indicating their stability or formation dynamics.
Conclusions:
- Electron energy loss spectroscopy is a powerful tool for chemical mapping of reaction phases in multilayer systems.
- The plasmon peak's sensitivity allows for detailed phase identification and characterization.
- The findings reveal the presence of well-defined epitaxial phases in the Cu-Al system, relevant for materials design and processing.
