Abstract
The hydrogen retention of B 4C converted graphite was investigated by using ECR ion irradiation apparatus. The retention properties were examined by a technique of thermal desorption spectroscopy (TDS) after the hydrogen ion irradiation. The H 2 desorption peaks appeared both at 350 and 700°C. The former peak was regarded as the detrapping from BH bondings, and the latter from CH bondings in the B 4C layer. The CH 4 desorption peaks appeared both at 250 and 700°C. Compared with the case of graphite, the hydrogen retention of B 4C rapidly decreased with the temperature, since the detrapping of BH bondings occurred around at 300°C. The total amount of trapped hydrogens in the B 4C was 1.5 times larger than of the graphite. The activation energies of H 2 and CH 4 desorptions of the B 4C were considerably than those of the graphite. The hydrogen retention of the B 4C was largely reduced by the He + ion bombardment after the hydrogen ion irradiation. In particular, the reduction ratio for the hydrogens trapped by boron was observed to be large.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call