Heat Capacity near the Consolute Point in Solid CH4–Ar

Measurements are reported of the heat capacity at saturated vapor pressure (essentially Cp) of the system CH4–Ar near its solid-solid consolute point (62°K, 65% Ar). In contrast to the behavior of the heat capacity at binary liquid consolute points, where there are striking anomalies, no large increase was observed for CH4–Ar. An abrupt increase of only about 13% occurred in the heat capacity near the transition. The possibility that the anomaly is suppressed by lattice strain effects is discussed.

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