Abstract
Solidification and melting of helium in confined geometries has been studied in a series of in situ pressure measurements, using both3He and4He, in porous glass with pore sizes from 12 to 191 Å in radius. These measurements covered the temperature range from 0.04 to 2 K and pressures up to 6 M Pa. In3He, a pressure minimum is observed in the pores at the same temperature as for the bulk. At large pore sizes the elevation in pressure in3He is inversely proportional to the pore radius as predicted by the model based on homogeneous nucleation of solid as a result of density fluctuations. However, the magnitude of the pressure elevation does not agree with this model. In4He, comparison with the model is complicated by the strong temperaturedependence of the pressure elevation.
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Bittner, D.N., Adams, E.D. Solidification of helium in confined geometries. J Low Temp Phys 97, 519–535 (1994). https://doi.org/10.1007/BF00754306
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DOI: https://doi.org/10.1007/BF00754306