Thermodynamic Properties of Vapor Complex Na2HfCl6
- Received Date: 2006-05-19
Abstract: Thermodynamic studies were carried out for the vapor complex of sodium chloride with hafnium tetrachloride at 712-778 K and 0.5-3.1 kPa by using high temperature phase equilibrium-quenching experiments, with closed Pyrex glass ampoules as the reaction containers. The results show that the sole predominant vapor complex is Na2HfCl6 for the HfCl4-NaCl system under the experimental conditions. The thermodynamic equilibrium constants and other thermodynamic functions of the reaction 2NaCl(s)+HfCl4(g)=Na2HfCl6(g) have been derived from the measurements. The results for the changes in enthalpy and entropy are -65.5§1.5 kJ/mol and -99.6§2.0 J/(mol K) in the temperature range.
|Citation:||Jun-li Li, Jin Yu, Dong-mei Yang, Zhi-chang Wang. Thermodynamic Properties of Vapor Complex Na2HfCl6[J]. Chinese Journal of Chemical Physics , 2007, 20(2): 180-184. doi: 10.1360/cjcp2007.20(2).180.5|