Pressure-volume-temperature relations in liquid and solid4He
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- Grilly, E.R. J Low Temp Phys (1973) 11: 33. doi:10.1007/BF00655035
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PVT relations in liquid and solid4He near the melting curve were measured over 0.3–2.0 K with a cell that used diaphragms for pressure and volume variation. The results were largely self-consistent and were essentially in agreement with the most careful previous work. The high values and strong temperature dependence of thermal expansion in the bcc solid resembled that of a liquid, but there was no evidence to substantiate some previous indications of premelting anomalous heat-capacity behavior. The phase diagram was examined carefully, and under equilibrium conditions the measurements led to good correlations. However, it seems improbable thatPVT relations can be connected with heat-capacity data through a simple Grüneisen parameter γ.