Absence of a Crystal Direction Regime in which Sputtering Corresponds to Amorphous Material

Area of Science:

• Materials Science
• Surface Science
• Ion Beam Interactions

Background:

• Sputtering, the erosion of material by energetic ions, is a critical process in various industrial and research applications.
• Understanding sputter yield is essential for controlling material removal and surface modification.

Purpose of the Study:

• To investigate the relationship between crystal orientation and sputter yield in metals using energetic ions.
• To compare the sputtering behavior of polycrystalline metals with amorphous materials.

Main Methods:

• Conducting independent experiments and simulations to determine sputter yields for individual grains.
• Analyzing sputter yield as a function of crystallographic direction for heavy keV ions on metallic targets.

Main Results:

• Demonstrated that sputter yield for heavy keV ions on metals is a continuous function of crystal direction.
• Showed that polycrystalline metals with random grain orientations do not exhibit the same sputter yield as amorphous materials.
• Attributed the observed differences to linear collision sequences rather than channeling effects.

Conclusions:

• Crystal direction significantly influences sputter yield in metals under energetic ion bombardment.
• The microstructural arrangement (polycrystalline vs. amorphous) affects sputtering behavior.
• Linear collision sequences are the primary mechanism governing directional sputtering in this context.