Abstract
The contribution to the heat capacity of liquid Se, Cp,r, arising from the ring-polymer equilibrium was calculated from the equilibrium polymerization theory of Tobolsky and co-workers. Above the polymerization transition temperature (∼360°K), Cp,r∼(1/8)(ΘH32/RT2)(M/Mo), where ΘH3 is the enthalpy change for the polymerization propagation step and (M/M0) is the monomer fraction of Se8 rings. Below the transition temperature, Cp,r is negligibly small. Heat capacities were measured for glassy and liquid Se from 180° to 280°K and from 320° to BOOK, respectively. Using available literature data and the equilibrium polymerization theory, the temperature dependence of the heat capacity of liquid Se was calculated; it agreed within experimental error with the measured temperature dependence.
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