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Determination of the low-temperature self-diffusion coefficient in solid p-H-2 from creep experiments
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, 47 Nauky Ave, UA-61103 Kharkov, Ukraine..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
2018 (English)In: Low temperature physics (Woodbury, N.Y., Print), ISSN 1063-777X, E-ISSN 1090-6517, Vol. 44, no 9, p. 946-951Article in journal (Refereed) Published
Abstract [en]

Dependencies of the relative elongation epsilon under the constantly applied stress at T = 1.8 K on the endurance time t of polycrystalline parahydrogen (p-H-2, similar to 0.2% of o-H-2) of high purity (99.9999 mol.%), with varying deuterium content, were measured. The region of linear dependence between the measured creep rates (epsilon) over dot of samples and the applied stress s was revealed. The conclusion that the low-temperature creep of the studied p-H-2 possesses a vacancy-type diffusion character was made on the basis of linear dependence (epsilon) over dot similar to s. Determination of the low-temperature self-diffusion coefficient of vacancies D in solid p-H-2, which characterizes the rate of low-temperature mass transfer, was performed. The cases of migration of vacancies in the crystal bulk, along boundaries separating individual crystallites, as well as between dislocations existing in crystals, are considered. A significant decrease in the (epsilon) over dot and D values with an increase in the isotope concentration in the samples was observed, while maintaining the linear relationship between (epsilon) over dot and s for the studied p-H-2. Published by AIP Publishing.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018. Vol. 44, no 9, p. 946-951
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-235894DOI: 10.1063/1.5052682ISI: 000445079800008Scopus ID: 2-s2.0-85053728776OAI: oai:DiVA.org:kth-235894DiVA, id: diva2:1255520
Note

QC 20181012

Available from: 2018-10-12 Created: 2018-10-12 Last updated: 2018-11-06Bibliographically approved

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