American Nuclear Society

Home / Publications / Journals / Fusion Science and Technology / Volume 41 / Number 3P2

Study of Carbon Deposition Effect on Hydrogen Permeation Through Palladium Membrane

S. Tominaga, A. Busnyuk, T. Matsushima, K. Yamaguchi, F. Ono, T. Terai, M. Yamawaki

Fusion Science and Technology / Volume 41 / Number 3P2 / May 2002 / Pages 919-923

Material Interaction and Permeation / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001 /

In view of benefits expected from the employment of membranes for particle control in fusion devices and for separation of hydrogen from its mixtures with hydrocarbons, the behavior of a Pd sample is investigated in a plasma-membrane device with a graphite target. The permeation of hydrogen through a 0.2 mm-thick Pd membrane with clean surfaces was found to be limited by the bulk diffusion. An incident flux of hydrocarbon radicals (approx. 2×1012 cm−2s−1) in hydrogen plasma forms no carbon layer on the Pd surface. Applying of a negative bias to the target gives rise to target sputtering, and to the deposition of carbon onto the membrane surface. The formation of carbon layer results in a decrease of the absorption probabilities of both H2 molecules and H atoms. The effect of the deposition of carbon is found to depend non-monotonically on membrane temperature.

Questions or comments about the site? Contact the ANS Webmaster.