High pressure studies of cobalt–hydrogen system by X-ray diffraction

Abstract

Cobalt–hydrogen system was studied in diamond anvil cell at high hydrogen pressure up to 22 GPa at room temperature by X-ray diffraction. Hydride formation from a solid solution of hydrogen in metal was observed at pressure around 4.5 GPa, and the decomposition of the hydride was observed at pressure around 3 GPa. Our studies are complementary to the earlier investigations conducted at higher temperatures, which employed technique that does not allow for the study of decomposition process.