X-ray diffraction technique in energy-dispersive mode at SPring-8 for fluids at high temperatures and high pressures

An energy-dispersive X-ray diffraction technique for fluid materials under high pressure, up to 200 MPa, and high temperature, up to 1700°C, has been developed using synchrotron radiation at SPring-8, a high-pressure vessel with Be windows pressurized with He gas, and a sample cell made of sapphire. A prototype of the high-pressure vessel and the sample cell was developed using in-house X-ray source in Hiroshima University. Using this technique one can overcome several difficulties of the experiments, such as high vapor pressure and high X-ray absorption constant of a sample, X-ray scattering and absorption by a sample cell, and X-ray absorption by a high-pressure vessel. We report the X-ray diffraction technique using synchrotron radiation at SPring-8.