研究報告8 - 1 総説 - Review
トリチウム用ゲッター材の開発指針
A Guiding Rule to Design Tritium Getters
渡辺 国昭、松山 政夫、芦田 完、三宅 均
富山大学トリチウム科学センター
〒930 富山市五福3190
Kuniaki WATANABE, Masao MATSUYAMA, Kan ASHIDA, Hitoshi MIYAKE
Tritium Research Center, Toyama University , Gofuku 3190, Toyama 930, JAPAN
(Received December 24, 1988)
Abstract
Hydrogen getter materials, most of which are
metals and alloys forming hydrides, are attractive for the establishment
of safe handling techniques of a large amount of tritium for the research
and development of thermonuclear fusion reactors. To develop materials
suitable for tritium handling, it is indispensable to find some guiding
rules to predict thermodynamic parameters determining the equilibrium pressure
of tritium.
From this viewpoint, we searched for the
relations between the observed heat of hydride formation and physicochemical
properties of metals and alloys for over 300 different data in about 100
systems. We found an empirical equation consisting of the electronegativeities
of hydride formers. This equation could evaluate the heat of the hydride
formation for not only metals but also alloys consisting of even three
or more components with the standard deviation of about 4 kcal/mol (hydride).
Although this equation is not quite accurate, especially for those having
relatively small heat of hydride formation, it can be applied as a powerful
guiding rule to design tritium getters with adequate thermodynamic parameters
for tritium handling.