Abstract
We measured the interfacial tension of 3 He- 4 He mixtures at several pressures up to 21 atm down to 0.18 K as well as the number densities of the 4 He-rich and 3 He-rich liquids at the phase-separation line. The interfacial tension was proportional to T2 up to about 0.4 K without respect to pressure, and the coefficient of this T2 -dependence did not depend strongly on pressure. The extrapolated values of the interfacial tension at absolute zero decreased drastically up to 3 atm, and at this level the decrease about 15% of the value at the saturated vapor pressure σi = 23.9 ± 1.0 μN/m. However, this tension was unchanged above 7 atm. From the pressure dependence of the absolute value the adsorption of 3 He relative to the Gibbs dividing surface of 4 He component was calculated.
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Ohishi, K., Yamamoto, H. & Suzuki, M. Interfacial Tension of Phase-Separated 3He-4He Mixtures Under Pressure. Journal of Low Temperature Physics 112, 199–210 (1998). https://doi.org/10.1023/A:1022667231573
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DOI: https://doi.org/10.1023/A:1022667231573