氧化镁纳米棒的晶格畸变及反常红外特性

Lattice Distortion and Abnormal Infrared Behavior of Magnesium Oxide Nanorods

以六水氯化镁和轻质氧化镁为原料,制备出碱式氯化镁纳米棒;再以碱式氯化镁纳米棒为前驱物,氢氧化钠为沉淀转化剂,合成出氢氧化镁纳米棒;采用煅烧前驱物氢氧化镁纳米棒分解得到氧化镁单晶纳米棒。通过X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、区域电子衍射(SAED)和红外吸收光谱(FT-IR)等手段对所得产物的表征分析结果表明,氧化镁纳米棒的微结构中存在晶格畸变,表现为晶格膨胀,其红外吸收峰出现了红移和蓝移同时并存现象;随煅烧温度的升高,氧化镁纳米棒的平均晶粒尺寸增加,晶格常数减小,晶格畸变量减小。

Basic magnesium chloride nanorods are prepared with light magnesium oxide and magnesium chloride hexahydrate as raw materials. Then, using converting precipitation method, magnesium hydroxide nanorods are synthesized with basic magnesium chloride nanorods as precursor. After calcining magnesium hydroxide nanorods,magnesium oxide nanorods are produced. The precursors and product are characterized by XRD, SEM,TEM,SAED and FT- IR. The results show that there exists lattice d islortion and the phenomena of red shift and blue shift of infrared absorption peaks together in MgO nanorods and that with the increase of calcination temperature,the lattice constant decreases and grain diameter increases.