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- W50827407 abstract "A technique was developed for measurement of the solubility and release kinetics of hydrogen in refractory nonmetals. Uranium dioxide specimens were saturated with hydrogen in a high-pressure furnace at pressures between 5 and 30 atm and temperatures from 1200 to 1600°C. Release was accomplished in a separate vacuum extraction apparatus in which the specimen was subjected to a linear temperature ramp. Mass spectrometric detection of the released hydrogen had a sensitivity of ≈ 2 ng/h. The equilibrium H/U ratios of hydrogen in single-crystal UO2 were between 1 × 10−6 and 3 × 10−5 with an apparent heat of solution of 235 kJ/mol. Sievert's law was obeyed. The solubilities of hydrogen in stoichiometric polycrystalline UO2 were about 10 times larger than in the single crystal, and in polycrystalline UO2 − x, about 100 times larger. The hydrogen desorption curves showed multiple peaks, which could not be explained by a simple diffusion mechanism. The kinetics were modeled as first or second order detrapping processes." @default.
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- W50827407 date "1989-08-01" @default.
- W50827407 modified "2023-10-02" @default.
- W50827407 title "Hydrogen dissolution in and release from nonmetals" @default.
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- W50827407 doi "https://doi.org/10.1016/0022-3115(89)90227-4" @default.
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