碱式氯化镁晶须的水热制备及热分解机理研究

Hydrothermal synthesis and thermal decomposition mechanism of basic magnesium chloride whiskers

摘要:

采用水热法以盐场卤水、氢氧化钠为原料制备了碱式氯化镁晶须。通过SEM和SAED观察样品的显微形貌及晶体结构，晶须长度150μm以上，直径0.5-1μm，为单晶物质。通过XRD测定样品的晶相结构，产物为碱式氯化镁9Mg(OH)2?MgCl2?5H2O。通过红外光谱考察了不同镁离子浓度产物官能团的不同。升温速率为2-5℃/min，高温程序煅烧前驱体碱式氯化镁，制备出氧化镁晶须，很好的保持了碱式氯化镁晶须的形貌，仍为单晶物质，并推测了其可能的热分解的机理过程。

Abstract:

Basic magnesium chloride whiskers were prepared with saltworks brine and Sodium Hydroxide as starting raw. Morphology and crystal Structure of products were investigated by SEM and SAED. The whiskers were single crystal material with the average Diameter of 0.5-1μm and length of more than 150μm. Crystalline structure of the samples were characterized by XRD, and product is 9Mg(OH)2?MgCl2?5H2O. It’s functional groups of different magnesium ion concentration were investigated by FT-IR. Magnesium oxide whiskers were program calcinated high temperature at heating rate of 2-5℃/min, Keeping the morphology and single crystal structure of magnesium oxide whiskers well. The possible mechanism of thermal decomposition process was speculated also.