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Thermodynamic Properties of Vapor Complex Na2HfCl6
Jun-li Li ,Jin Yu ,Dong-mei Yang ,Zhi-chang Wang*
Author NameAffiliation
Jun-li Li School of Sciences, Northeastern University, Shenyang 110004, China 
Jin Yu School of Sciences, Northeastern University, Shenyang 110004, China; School of Sciences, Shenyang University of Technology, Shenyang 110023, China 
Dong-mei Yang School of Sciences, Northeastern University, Shenyang 110004, China 
Zhi-chang Wang* School of Sciences, Northeastern University, Shenyang 110004, China 
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.
Key words:  HfCl4, NaCl, Na2HfCl6, Vapor complex, Phase equilibrium-quenching experiment
FundProject:This work was supported by the National Natural Science Foundation of China (No.50274027).
气态配合物Na2HfCl6的热力学性质
李军丽 ,于锦 ,杨冬梅 ,王之昌*
摘要:
以密闭的Pyrex玻璃瓶为反应器,用高温相平衡-淬冷实验方法,在712-778 K和0.5-3.1 kPa下研究了NaCl与HfCl4的反应热力学.结果显示,Na2HfCl6(g)是HfCl4-NaCl二元系中唯一反应产物.由实验结果计算了反应2NaCl(s)+HfCl4(g)=Na2HfCl6(g)的热力学平衡常数,并计算出该温度范围内反应的焓变为-65.5±1.5 kJ/mol和反应的熵变为-99.6±2.0 J/molK.
关键词:  HfCl4,NaCl,Na2HfCl6,气态配合物,相平衡-淬冷法
DOI:10.1360/cjcp2007.20(2).180.5
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