Synthesis of Microsized Co3O4 Octahedral by High Temperature Gas-solid Hydrolysis
高温气-固反应水解制备八面体形四氧化三钴粉末

A novel method, involving high temperature gas-solid hydrolysis, was proposed for the preparation of micro-Co3O4 powder. The effects of reaction temperature, crystal water content of CoCl2, the addition of inert dispersate on the product were investigated. The composition,morphology, and particle size of the prepared particle are characterized by X-ray diffraction(XRD), Scanning electronmicroscope(SEM) and Laser particle size analysis. The results indicate that the obtained powder with octahedral crystal structure are surrounded by {111} crystal surfaces. And the size ranges from submicron to micron, the particle size increases with the temperature elevating, the size distribution becomes narrow when CoCl2·2H2O is employed as precursor. The addition of inert dispersate is beneficial to the monodispersity of the obtained powder. The reasons for the formation of octahedral crystal morphology and the influencing factors of the particle size and morphology are also discussed.