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Absorption/desorption of hydrogen isotopes and isotopic waters by Zr-alloy getters

Journal Article · · J. Vac. Sci. Technol., A; (United States)
DOI:https://doi.org/10.1116/1.575543· OSTI ID:7161676
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Zr-alloy getters have been applied to tritium handling and vacuum conditioning for fusion devices. Some of their properties, however, should be improved to apply them in future devices. From this viewpoint, we have studied the effects of alloying on the getter properties of Zr alloys. We found that the activation energy of absorption and desorption of hydrogen varied considerably with alloying. The activation energy for hydrogen absorption was 0.74 for Zr/sub 61/Al/sub 39/, 0.01 for Zr/sub 57/V/sub 36/Fe/sub 7/, 0.63 for Zr/sub 67/Ni/sub 33/, and 2.8 kcal/mol for Zr/sub 85/Ni/sub 15/, whereas that for Zr was 2.6 kcal/mol. The heat of hydrogen absorption was 27.8 kcal/mol for Zr: it changed with alloying as 32.0--33.4 (Zr/sub 61/Al/sub 39/), 27.8--28.4 (Zr/sub 57/V/sub 36/Fe/sub 7/), 29.0 (Zr/sub 67/Ni/sub 33/), and 28.0 (Zr/sub 85/Ni/sub 15/). In addition, the ratio of the pumping speed of water vapor to that of hydrogen at room temperature varied with alloying element: for example, 1/40 for Zr/sub 57/V/sub 36/Fe/sub 7/ and 1/4 for Zr/sub 67/Ni/sub 33/. The alloying effects mentioned above are considered due to modification of the electronic and/or geometric structure of Zr with alloying.
Research Organization:
Tritium Research Center, Toyama University, Gofuku 3190, Toyama 930, Japan
OSTI ID:
7161676
Journal Information:
J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 6:4; ISSN JVTAD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ATOM TRANSPORT
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
DESORPTION
DEUTERIUM
ELEMENTS
FABRICATION
GETTERING
GETTERS
HEAVY WATER
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
IMPURITIES
IRON ALLOYS
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
METALS
NEUTRAL-PARTICLE TRANSPORT
NICKEL ALLOYS
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
RADIATION TRANSPORT
RADIOISOTOPES
SORPTIVE PROPERTIES
STABLE ISOTOPES
SURFACE PROPERTIES
THERMONUCLEAR REACTORS
TRANSITION ELEMENTS
TRITIUM
TRITIUM COMPOUNDS
TRITIUM OXIDES
VACUUM SYSTEMS
VANADIUM ALLOYS
WATER
YEARS LIVING RADIOISOTOPES
ZIRCONIUM
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS