摘要：利用直接沉淀法得到片状氢氧化镁前驱体,再结合煅烧法得到立方纳米氧化镁;为优化实验条件,讨论氢氧化镁前驱体及氧化镁的形貌影响因素。实验结果表明:当氢氧化钠的物质的量浓度为0. 5 mol/L、镁盐物质的量浓度为0. 4 mol/L时,可得到分散性较好的片状氢氧化镁前驱体;当氯化镁的纯度较高时,氢氧化镁结晶度进一步提高,呈现出分散均匀的花瓣状薄片形貌;煅烧温度控制在1 150℃时,所得到的立方纳米氧化镁分散性较好。

Abstract: Direct precipitation method was applied to prepare the precursor of flaky magnesium hydroxide．Then calcination method was employed to obtain cubic nanometer magnesium oxide．In order to optimize experimental conditions，the influencing factors on morphology of precursor and magnesium oxide were discussed．The results show that flaky magnesium hydroxide with better dispersion is obtained when concentration of sodium hydroxide is 0．5 mol /L and concentration of magnesium salt is 0．4 mol /L．Besides，magnesium chloride with higher purity can further improve the crystallinity of magnesium hydroxide，which has petaloid-like morphology with homogeneous dispersion．During the calcination process， cubic nanometer magnesium oxide with better dispersion is obtained when the temperature is controlled at 1 150 ℃ ．

Keywords: cubic nanometer magnesium oxide; magnesium hydroxide; direct precipitation method; calcination method