Phonon scattering by structural defects in solid p-H-2 and in p-H-2-o-D-2 solutions

Citation
Oa. Korolyuk et al., Phonon scattering by structural defects in solid p-H-2 and in p-H-2-o-D-2 solutions, LOW TEMP PH, 27(6), 2001, pp. 504-508
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
LOW TEMPERATURE PHYSICS
ISSN journal
1063777X → ACNP
Volume
27
Issue
6
Year of publication
2001
Pages
504 - 508
Database
ISI
SICI code
1063-777X(200106)27:6<504:PSBSDI>2.0.ZU;2-F
Abstract
A study is made of the influence of structural defects on the thermal condu ctivity in parahydrogen crystals and in parahydrogen-orthodeuterium solutio ns. The defects in the crystals are generated by means of a thermal shock. The temperature dependence of the thermal conductivity is analyzed in the f ramework of the Callaway relaxation model in the Debye approximation for th e phonon spectrum with allowance for phonon-phonon scattering processes and Rayleigh scattering on isotopic defects and structural defects such as dis locations and low-angle boundaries. The effect produced in the sample by th e thermal shock is found to depend on the deuterium concentration. In pure parahydrogen an increase in the dislocation density is observed, and in par ahydrogen-orthodeuterium solutions an increase in the density of low-angle boundaries. The change in the density of low-angle boundaries in the soluti ons after the thermal shock depends linearly on the concentration of o-D-2. (C) 2001 American Institute of Physics.