Abstract
Recent high pressure and high temperature in situ X-ray experiments using synchrotron radiation are reviewed. Among them are the behavior of Fe-H system, the conversion of graphite into hexagonal diamond, and an in situ observation of the formation of MgSiO3 perovskite from enstatite. The latter two studies were made by the newly developed Drick-amer-type high pressure apparatus using sintered diamond anvil, which is capable up to at least 30 GPa and 1500°C. Experiments up to 210 GPa were performed using diamond anvil apparatus combined with a very thin collimator system. A design of the apparatus to be constructed in the new synchrotron facility is discussed.
