Energy excess functions of mixtures of helium isotopes in the supercritical temperature range
L. V. KarnatsevichPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovI. V. BogoyavlenskiǐPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovL. P. Titar’Physicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovI. V. LepinPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, KharkovV. G. KonarevaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
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The excess Gibbs potential (GE), excess entropy (SE), and excess enthalpy (HE) of a 3He–4He mixture in the temperature range 4.5–14 K at pressures up 30 atm are calculated on the basis of experimental P–V–T data. The dependences of these functions on the temperature, pressure, and concentration of the mixture are established. The results are compared with calculations by the Prigogine theory. The excess characteristics of the 3He–4He system are calculated within the framework of the gas approximation with allowance for both diffraction and quantum-statistical effects.
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