(1. 大连交通大学 辽宁省无机超细粉体制备及应用重点实验室，大连 116028；
2. 营口理工学院 化材系，营口 115014)
摘 要: 以硝酸钴和氢氧化钠为原料，在纯水体系下采取一步水热法合成出具有立方体形貌的Co3O4粉体。利用X射线衍射、场发射扫描电镜、傅里叶变换红外光谱仪及透射电镜对样品相结构及微观形貌进行分析。结果表明：在不同Co2+和OH-摩尔配比下，通过水热时间调整，均能生成单一的Co3O4相。期间产物经历了从Co(OH)2至 中间相混合相再至Co3O4的相结构转变，中间相能否产生是Co(OH)2能否转变为Co3O4的关键。产物的微观形貌相应于相结构的变化经历了由片状Co(OH)2向立方体形Co3O4的转变，立方体形形貌的产生归因于溶解再结晶过程。
关键字: 四氧化三钴；立方体形貌；溶解氧；硝酸根离子
（1. Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 116028, China;
2. Department of Chemical Engineering, Yingkou Institute of Technology, Yingkou 115014, China）
Abstract:Cubic cobalt oxide (Co3O4) was synthesized from cobalt nitrate and sodium hydroxide by one-step hydrothermal method in a pure water system. The phase structure and micromorphology analysis of the sample were studied by using XRD, SEM, FT-IR and TEM. The results show that under different molar ratios of Co2+ and OH-, a single Co3O4 phase can be generated through hydrothermal time adjustment. During the period, the product undergoes a transition from Co(OH)2 to mixed phase to pure phase Co3O4. The generation of mesophase is the key to Co(OH)2 to the transformation of Co(OH)2 into Co3O4. The micro-morphology of the product has undergone a from platelet cubic Co3O4 corresponding to the change of phase structure, and the generation of cubic micro-morphology can be attributed to the dissolution and recrystallization process.
Key words: cobalt trioxide; cube structure; dissolved oxygen; nitrate
