| X-ray diffraction (XRD) equipment | Ultima IV (Rigaku corp.) |
| Characteristic X-ray | CrKα (For residual stress of (1 3 3) plane) |
| Diffraction plane | tetragonal (1 3 3) |
| Diffraction angle (deg) | 153.50 |
| X-ray stress constant (MPa/deg) | −283 [19] |
| Tube voltage (kV) | 40 |
| Tube current (mA) | 40 |