Novel features of pressure relaxation in nonequilibrium helium crystals
The method of precision barometry has been used to study the structural relaxation processes in nonequilibrium helium crystals obtained by liquid crystallization during rapid cooling in the temperature range of 1.3–1.7 K. The pressure at the ends of a cylindrical measuring cell with solid helium and...
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Veröffentlicht in: | Low temperature physics (Woodbury, N.Y.) N.Y.), 2018-09, Vol.44 (9), p.938-945 |
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Sprache: | eng |
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Zusammenfassung: | The method of precision barometry has been used to study the structural relaxation processes in nonequilibrium helium crystals obtained by liquid crystallization during rapid cooling in the temperature range of 1.3–1.7 K. The pressure at the ends of a cylindrical measuring cell with solid helium and their variation with time during stepwise heating of the sample were measured. The experimental results for the relaxation kinetics, when the pressure values recorded by both sensors increased with time, were analyzed. Analysis of the experimental results provides estimates of the average atomic concentration of vacancies in the crystal, the vacancy diffusion coefficient values, and the activation energy of vacancy motion. The present work continues the study of structural pressure relaxation initiated in a previous work (LTP 44, 402 (2018)), where a model describing the relaxation of internal stresses in nonequilibrium helium crystals associated with the diffusion of vacancies was proposed for interpretation of the experimental data. |
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ISSN: | 1063-777X 1090-6517 |
DOI: | 10.1063/1.5052681 |