Higher-Order Phase Transitions inMonolayers Adsorbed on Basal-Plane Graphite
- 22 December 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 35 (25) , 1718-1721
- https://doi.org/10.1103/physrevlett.35.1718
Abstract
Heat capacity and vapor-pressure measurements indicate a higher-order phase transition in nitrogen monolayers adsorbed on basal-plane graphite. The transition coincides with finite jumps in three experimental quantities: the two-dimensional compressibility, the isosteric heat of adsorption, and the heat capacity at constant area. Thermodynamics implies that the heat capacity at constant two-dimensional spreading pressure also has an abrupt jump and hence the transition is suggestive of a second-order Ehrenfest type.Keywords
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