The development of high energy X-ray total scattering method at Beijing Synchrotron Radiation Facility

摘要: As a powerful local structure probe, high energy X-ray total scattering method has been used widely in condensed matter physics, materials science and other fields. With a super-conducting wiggler (SCW) and sagittal focusing monochromator, a high energy X-ray total scattering apparatus has been developed at 3W1 beamline of Beijing Synchrotron Radiation Facility, BSRF, a first-generation synchrotron source. The total scattering apparatus mainly consists of a large two-dimensional flat-panel detector and high-energy X-rays of 50-70 keV, enabling total scattering measurements to be carried out for pair distribution function (PDF) analysis with a Q range of 0.5-25 Å-1. Based on this apparatus, a series of in-situ devices were developed, enabling the acquisition and analysis of data with a decent signal-to-noise ratio under various conditions. Demonstration results, including the observation of perovskite oxides with various A-site doping and bioactive glasses upon annealing, were presented. The practices outlined herein validated that the PDF method is capable of characterizing complex material structure at the atomic level. As synchrotron facilities continue to advance, this work stands as a critical source for fostering collaboration and driving progress in the field of scattering science.