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

Abstract: As a powerful probe for local structure analysis, 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 A-1. Based on this apparatus, a series of in-situ devices were developed, data with good signal noise ratio were obtained and analyzed. Demonstration results for the observation of perovskite oxides with various A-site doping and bioactive glasses upon annealing were introduced. Notably, the PDF method can provide detailed local structural information of amorphous materials, liquids and structural disorder in crystalline materials. This work offers a guideline for people who considers to develop and use total scattering method at the other synchrotron facility.