Creep in solid hydrogen at the unsteady stage
L. A. ALEKSEEVAPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovO. V. LitvinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovI. N. KrupskiĩPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
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A study was made of unsteady creep in normal hydrogen (75% ortho-hydrogen) over a wide temperature range, namely from 1.8 to 12 °K, and also in parahydrogen with the orthohydrogen content reduced to 0.2% at helium temperatures. It has been found that the strain of solid hydrogen varies in time according to two different laws, depending on the temperature of the test specimens and on the concentration of deuterium impurities. In the range of helium temperatures, where creep in n-H2 is logarithmic, no temperature dependence has been found. In pure parahydrogen down to 1.8 °K creep is associated with climbing of dislocations. The role of quantum effects is also considered.
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