Silicon notes
Endless electroplated diamond wire studies on silicon emphasize smooth surface formation, process parameters, and the role of wire speed, feed, and tension.
The goal is usually controlled slicing or cut-off with reduced damage and acceptable surface roughness.
Sapphire notes
Sapphire research highlights the difficulty of cutting a hard brittle crystal and studies how wire speed and feed influence roughness.
Reported experimental values are useful as references, but commercial use should rely on test cutting because crystal size, orientation, and quality requirements vary.