Temperature dependence of the excess molar volume of He3-He4 mixtures over the range from 1.5 to 14°K
I. V. BogoyavlenskiǐPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Khar'kovL. V. KarnatsevichPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Khar'kovS. N. YurchenkoPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Khar'kov
ABI
Abstract
The molar volumes of He3, He4 and a mixture of He3-He4 with 50.7 mole% He3 were determined by the dielectric constant measurement method over the temperature range 1.5 to 14°K, at two pressure values of 3 and 10 atm. It was established that the temperature dependence of the excess molar volume VE, characterizing the deviation of the solution from ideal, has a nonmonotonic sign-alternating nature. With increase of pressure from 3 to 10 atm, the excess volume is decreased in absolute value by a factor of 30−40. The established behavior of VE(T) was found to have a qualitative explanation within the scope of the Prigogine model for isotopic systems.
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