Formation Mechanism and Thermodynamic Property of Basic Magnesium Chloride Whisker
作者:Guosheng Wang、Shanshan Wu、Lei Li、Yang Liu
DOI:10.14233/ajchem.2015.19037
日期:——
The basic magnesium chloride whiskers including type3-1-8, 3-1-6, 9-1-5 and 5-1-3 were synthesized simultaneously in the MgO-MgCl-H2O solution system. The results agree well with the formation mechanism of that the unit of the crystal growth, anion or hydroxyl [Mg–(OH)y]2–y (1 £ y £ 6) and x[Mg–(OH)2] (1 £ x £ 9) were the basic construction of basic magnesium chloride and the reaction temperature and molar ratio of MgCl2/MgO were the important effect factors. The standard molar enthalpies of basic magnesium chloride whisker (type 3-1-8) were obtained from a combination of the results with measured enthalpies of basic magnesium chloride whisker (type 3-1-8) in HCl(aq.) and together with the standard molar enthalpies of formation of MgO(s), MgCl2·6H2O and H2O(l) through the design of thermochemical cycle of basic magnesium chloride.
在 MgO-MgCl-H2O 溶液体系中同时合成了 3-1-8、3-1-6、9-1-5 和 5-1-3 型碱式氯化镁晶须。 结果与晶体生长单元、阴离子或羟基[Mg-(OH)y]2-y(1 £ y £ 6)和 x[Mg-(OH)2](1 £ x £ 9)是碱式氯化镁的基本结构,反应温度和 MgCl2/MgO 摩尔比是重要影响因素的形成机理十分吻合。 通过碱式氯化镁的热化学循环设计,结合碱式氯化镁晶须(3-1-8 型)在盐酸(aq.)中的实测焓值,以及 MgO(s)、MgCl2-6H2O 和 H2O(l)的标准摩尔形成焓值,得出了碱式氯化镁晶须(3-1-8 型)的标准摩尔焓值。