Study of β-γ phase transition of tin single cristal under dynamic compression by X-ray diffraction

We investigate the β-γ phase transition of tin single crystal under shock loading by X-ray diffraction and velocimetry. The observation of the γ phase appearance is needed to validate the mechanism and the pressure of the transition. This last one is established between 7 and 11.5 GPa in static and dynamic experiments. Primary X-ray diffraction combined with plate impact experiments were carried out on both CEA Gramat, using a gold X-Pinch X-ray source, and the APS synchrotron on a unique single crystal orientation. A new configuration of the experiment has been elaborated to emphasize the γ-phase from three orientations (110), (100) and (001) of the β-phase single crystal. For this new configuration, a molybdenum source with X-ray emission more penetrating than gold (17.4 keV over 9.7 keV), was selected at CEA Gramat to bring out more information. Additional experiments were carried out for each orientation on both CEA Gramat and APS synchrotron facilities to confirm the hypothesis.