Hydrogen in porous Vycor glass (pore radius Rₚ=3.0 nm) has been investigated with a torsional oscillator technique at 7.5 K {≤}T{≤} 22 K. H₂ molecules which are adsorbed in Vycor at T{}T₃ (T₃, triple point of bulk H₂) leave the Vycor when decreasing the temperature to below a characteristic value Tc{≤}T₃; Tc depends on the amount of H₂ in the Vycor. This interpretation of the data is supported by simultaneous measurements of the H₂ vapor pressure. A similar phenomenon is observed with a capacitor filled with Vycor into which H₂ is condensed. We conclude that the free energy of solid H₂ in the Vycor is larger than that of bulk solid H₂. Information on the free energy of H₂ confined in the Vycor is important to understand the depression of its freezing temperature in restricted geometries. We also discuss the properties of solids and the depression of their freezing temperature in restricted geometries. {} 1996 The American Physical Society.
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Schindler et al. (1996) studied this question.
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