Related Experiment Videos
Preparation and characterization of MgO surfaces by reflection electron microscopy
P A Crozier1, M Gajdardziska-Josifovska, J M Cowley
1Department of Physics, Arizona State University, Tempe 85287-1504.
Microscopy Research and Technique
|February 15, 1992
Summary
Researchers explored methods for preparing magnesium oxide (MgO) crystal surfaces. Different treatments yielded distinct surface topographies and properties, crucial for materials science applications.
Area of Science:
- Materials Science
- Surface Science
- Crystallography
Background:
- Magnesium oxide (MgO) is a technologically important ceramic material.
- Controlling surface structure is critical for MgO's applications.
- Previous methods for preparing specific MgO surface orientations were limited.
Purpose of the Study:
- To investigate diverse preparation techniques for (100) and (111) MgO surfaces.
- To characterize the resulting surface topography and structural properties.
- To understand the effects of different treatments on MgO surface quality.
Main Methods:
- Crystal cleaving along (100) and (111) planes.
- Chemical polishing of MgO surfaces.
- Annealing in oxygen atmosphere.
- Reflection High-Energy Electron Diffraction (RHEED) for surface analysis.
Main Results:
- Cleaved (100) MgO surfaces exhibited coarse steps and good RHEED patterns.
- Chemical polishing roughened the (100) surface topography.
- Oxygen annealing smoothened (100) surfaces but introduced contamination.
- (111) MgO surfaces were successfully cleaved and found to be atomically flat.
- Oxygen annealing led to reconstruction of (111) surfaces.
Conclusions:
- Specific preparation methods significantly influence MgO surface characteristics.
- Both (100) and (111) MgO surfaces can be prepared with controlled topography.
- Oxygen annealing is effective for achieving flat and reconstructed (111) surfaces.