NbCl5-KCl二元系的热力学性质
(东北大学 理学院, 沈阳 110004)
摘 要: 用高温平衡-淬冷方法, 研究了NaCl-NbCl5和KCl-NbCl5二元系的热力学性质。结果表明： 在580～680 K和0.06～0.12 MPa范围内, NaNbCl6(g)和KNbCl6(g)分别是惟一产物, 且NaNbCl6(g)比KNbCl6(g)稳定。 反应NbCl5(g)+NaCl(s)==NaNbCl6(g)的热力学函数是ΔHm=(-28.3±1.5) kJ/mol和ΔSm=(-73.0±2.0)J/(mol·K)； 反应NbCl5(g)+KCl(s)==KNbCl6(g)的热力学函数是ΔHm=(-37.6±1.5)kJ/mol和ΔSm=(-93.7±2.0)J/(mol·K)。
关键字: NaNbCl6； KNbCl6； NbCl5； NaCl； KCl； 气态配合物； 淬冷法
and NbCl5KCl binary systems
by quenching experiments
（School of Sciences, Northeastern University, Shenyang 110004, China）
Abstract: Thermodynamic properties of NaCl-NbCl5 and KCl-NbCl5 binary systems were studied by high temperature equilibrated quenching experiments. The results show that NaNbCl6(g) and KNbCl6(g) complexes are respectively their sole predominant vapour complexes roughly in the ranges of 580-680 K and 0.06-0.12 MPa, and that NaNbCl6(g) is more stable than KNbCl6(g). The thermodynamic properties are ΔHm=(-28.3±1.5) kJ/mol and ΔSm=(-73.0±2.0) J/(mol·K) for the reaction NbCl5 (g)+NaCl (s)==NaNbCl6 (g), and ΔHm=(-37.6±1.5) kJ/mol and ΔSm=-(93.7±2.0) J/(mol·K) for the reaction NbCl5 (g)+KCl (s)==KNbCl6 (g).
Key words: NaNbCl6； KNbCl6； NbCl5； NaCl； KCl； vapour complex； quenching method
