Comparison of Orientation Mapping in SEM and TEM

Area of Science:

• Materials Science
• Nanotechnology
• Crystallography

Background:

• Accurate characterization of material microstructure at the nanoscale is crucial for understanding material properties.
• Nanoscale orientation mapping techniques are essential for detailed microstructural analysis.
• Different experimental setups may influence the fidelity of microstructure representation.

Purpose of the Study:

• To compare the fidelity of multiple experimental configurations for nanoscale orientation mapping.
• To evaluate Transmission Kikuchi diffraction (TKD) and nanobeam diffraction (NBD) for analyzing gold (Au) thin films.
• To determine the optimal conditions for obtaining high-quality microstructural data using different methods.

Main Methods:

• Performed Transmission Kikuchi diffraction (TKD) in a scanning electron microscope (SEM) at 30 kV with horizontal and vertical detectors.
• Conducted nanobeam diffraction (NBD) in a transmission electron microscope (TEM) at 300 kV.
• Analyzed thin electrodeposited hard Au films with two distinct microstructures (>50 nm and <20 nm grain sizes) in the same regions.

Main Results:

• Demonstrated that all three configurations (SEM-TKD horizontal, SEM-TKD vertical, TEM-NBD) can produce data of equivalent quality when proper conditions are met.
• Identified specific strengths and challenges associated with each acquisition method.
• Highlighted the importance of appropriate experimental conditions for achieving high-fidelity microstructural representation.

Conclusions:

• Under optimized conditions, SEM-TKD and TEM-NBD are viable techniques for high-quality nanoscale orientation mapping.
• Each method presents unique advantages and limitations in representing the true microstructure.
• Understanding these conditions and challenges is key to selecting the appropriate technique for microstructural analysis.