Heat capacity configurational

THE CONFIGURATIONAL HEAT CAPACITY OF FULLERITE OVER THE REGION OF SCL FCCL PHASE TRANSITION... 

Below the statistical-thermodynamical calculation of configurational heat capacity of ordering twocomponent fullerite from fullerenes = C(, , [Pg.219]

This formula (15) defines dependence of configurational heat capacity of sc phase at z- 1 and fee phase at z =2, respectively, on temperature and ci, c2 concentrations of fullerite. 

The derived formulae (16), (18) allow us to elucidate the character of temperature dependence of the configurational heat capacity of sc and fee phases of fullerite of stoichiometric composition over the region of temperatures of phase transition from one phase to another. 

For elucidation of the temperature dependence of the configurational heat capacity of fullerite of stoichiometric composition the theory proposes that phase transition occurs in ordered phases, when q 0 and q2 0. So, it can be assumed that the T0... 

Now by the use of the selected values of the Ti = Ti, T2 ordering temperatures (22), (23) and with the determination of numerical values of order parameters for all temperatures by the curve plots of Fig. 3, the temperature dependence of configurational heat capacity can be elucidated by formula (16) and the peculiarities of this dependence can be established over the region of scl feel phase transition. 

The elaborated statistical-thermodynamical calculation makes it possible to elucidate the character of temperature dependence of configurational heat capacity... 

Fig. 17. Temperature variation of internal energy. Et (kj mole"1), coordination number (CN), and gmi /gm.x ratios of water showing the occurrence of the glass transition in the 200-240 K range. Volume also shows a similar change, but a slightly lower temperature. In the inset, variation of the configurational heat capacity, Cp (J deg 1 mole-1), with temperature is shown. (From Chandrasekhar and Rao (73).)...

The second term on the right is called the configurational heat capacity, and is due to the relaxation of system to the equilibrium configuration (Kondepudi and Prigogine, 1999)... 

The configurational heat capacity for a transformation at equilibrium and constant pressure is defined by combining Eqs. (12.18) and (12.19)... 

Konno, S. Saeki, N. Kuwahara, N. Nakata, M. Kaneko, M., "Upper and Lower Critical Solution Temperatures in Polystyrene Solutions. IV. Role of Configurational Heat Capacity," Macromolecules, 8, 799 (1975). 

Table 1.—Configurational heat capacities of some liquids at CONSTANT PRESSURE (cal mole l deg"J)...

Angell [43] takes the configurational heat capacity as inversely proportional to absolute temperature, ACp = KIT, where A " is a constant of the material. With this relationship, the relaxation time in Eq. (3) becomes... 

The above considerations may be applied directly to the configurational heat capacity of the vitreous state. Following Simon we may say that the vitreous state is distinguished from the liquid state by the fact that internal chemical equilibrium is not established we thus have for the vitreous state, and A = 0 for the liquid state. As an... 

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