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| energy | short name | frequency (Hz) | number of spheres (N) | diameter of spheres (mm) | total weight of spheres (g) | ball-to-powder ratio (BPR) |
|---|---|---|---|---|---|---|
| mild | ME | 15 | 1 | 15 | 10 | 20 |
| high | HE | 50 | 3 | 10 | 10 | 20 |
Milling times (τ): 0.5, 1, 2, 4, and 8 h.
