Exchange of hydrogen iusotopes in Xide ceramics and water-vapor using ERD technique

摘要

This paper describes the exchange of deuterim in a tritium breeding ceramics, Li_2ZrO_3, for protium by exposure to air-vapor which has been studied by means of the elastic recoil detection technique with 1.7 MeV He~+ ion beam. The ceramic specimen implanted up to saturation concentration at room temperature with 5 keV D_2~+ ions is exposed to normal air introduced into the vacuum chamber at room temperature. It is found that the retained number of D implanted decreases, while the retain number of H increases as the exposure time to normal air increases. The exchange behavior of D for H in Li_2ZrO_3 is compared with that in SrCe_(0.95) Yb_(0.05)O_(3- delta ) studied previously and the processes for hydrogen isotope exchange observed are discussed.