HEAT-CAPACITY STUDY OF CF3H PHYSISORBED ON GRAPHITE

Monolayers of the methane derivative CF3H physisorbed on graphite have been investigated by calorimetry. The coverage-temperature phase diag ram of a previous diffraction study has been refined. The melting and the antiferroelectric phase transition of the monolayer solid are iden tified as first-order transitions. The layering of the second monolaye r shows a large thermal hysteresis. The presence of the second layer c hanges the structural phase transition temperature of the monolayer.