Abstract
Hydrogen in porous Vycor glass (pore radiusR p=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 atT≥T 3 (T 3: triple point of bulk H2) leave the Vycor when decreasing the temperature to below a characteristic valueT c≤T 3;T c depends on the amount of H2 in the Vycor. 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. The mechanism of the mass flow is discussed in the light of the temperature dependence of its speed.
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