Rate of flow of bcc crystals of 4He through a porous membrane
N. E. DyuminPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovN. V. ZuevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovS. V. SvatkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. N. Grigor’evPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
Results of measurements of the flow rate of helium through a porous membrane are used to obtain information about the coefficient of atomic self-diffusion and vacancy diffusion in bcc 4He. The diffusion processes are isotropic and can be treated as thermally activated under the assumption of a monovacancy mechanism. The entropy of self-diffusion activation, the enthalpy of vacancy formation, and the height of the potential barrier are estimated.
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