Pressure-induced Wurtzite-to-Rocksalt phase transition

Cadmium Sulfide (CdS) is a well-studied material which undergoes a solid-solid phase transition from wurtzite to rock salt structures between 3 and 9 GPa. Here we describe the results of dynamic x-ray diffraction (XRD) experiments performed at the Dynamic Compression Sector (DCS) on single crystal CdS shocked along the crystal c-axis. A graphical software tool DENNIS (Diffraction Experiment desigN and aNalysIS), which provides rapid powder and single-crystal diffraction pattern predictions and powder diffraction pattern image integration in three-dimensional geometries, was used to identify orientation relations between the parent and daughter phases. DENNIS also provides unique insight into the mosaicity resulting from this solid-solid phase transition and the relationship of the mechanism to the elastic/inelastic deformation and kinetics of the transition. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. This presentation includes work performed at the DCS, operated by WSU under contract DE-NA0003957, at the APS, operated by Argonne under contract DE-AC02-06CH11357.