Enthalpies of Mixing in the LaI3鈥揗I (M = Li, Na, K, Rb, Cs) Binary Systems

详细信息    查看全文

• 作者：Bozena Pilarek ; Leszek Rycerz ; Ida Chojnacka ; Marcelle Gaune-Escard
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：September 10, 2015
• 年：2015
• 卷：60
• 期：9
• 页码：2629-2635
• 全文大小：361K
• ISSN：1520-5134

文摘

The molar enthalpy of mixing (螖_mixH_m) in the LaI₃鈥揗I (M = Na, K, Cs) liquid systems was measured over the whole composition range at 1060 K with a Calvet-type high temperature microcalorimeter. The mixing of two liquid components was achieved by using the 鈥渂reak-off ampoule technique鈥? The dependence of the interaction parameter on composition 位 = A + Bx + Cx² + Dx³ (x = mole fraction of LaI₃) was determined. Unknown molar enthalpy of mixing (螖_mixH_m) in the LaI₃鈥揕iI and LaI₃鈥揜bI liquid systems was calculated using the conformal solution theory of Davis. In all systems under investigation the enthalpies of mixing are negative except the LaI₃鈥揕iI system at LaI₃-rich compositions. The minimum of enthalpy is shifted toward the alkali metal iodide-rich part and is located at the composition of x(LaI₃) 鈮?0.35鈥?.40. Measured and calculated molar enthalpies of mixing were compared with the molar enthalpies of mixing in the LaCl₃鈥揗Cl and LaBr₃鈥揗Br (M = Li, Na, K, Rb, Cs) liquid systems.