MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
The Phase Diagram of Mo-H Alloys under High Hydrogen Pressures
Yuh FukaiMasaki Mizutani
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2003 Volume 44 Issue 7 Pages 1359-1362

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Abstract

The phase diagram of the Mo–H system was determined by in situ X-ray diffraction using synchrotron radiation up to 1200°C and the hydrogen pressure to p(H2) = 5.3 GPa. Three phases were found to exist; a bcc phase (α) of low hydrogen concentrations at low hydrogen pressures, and two high-pressure phases, an hcp (ε) phase at lower temperatures and an fcc (γ) phase at higher temperatures, both having a nearly stoichiometeric composition of x = [H]/[Mo] ∼ 1. A gradual lattice contraction observed in the fcc phase indicates the formation of superabundant Mo-atom vacancies (vacancy-hydrogen clusters).

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© 2003 The Japan Institute of Metals and Materials
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