Hydrothermal synthesis and characterization of nanocrystalline Zn–Mn spinel

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• 作者：Xiang-Dong Zhang ; Zhong-Shuai Wu ; Jian Zang ; Da Li ; Zhi-Dong Zhang
• 关键词：A. Nanostructures ; A. Non-crystalline materials ; A. Oxides ; B. Chemical synthesis ; C. X-ray diffraction
• 刊名：Journal of Physics and Chemistry of Solids
• 出版年：2007
• 期刊代码：69_00223697
• 类别：ch
• 出版时间：August 2007
• 卷：68
• 期：8
• 页码：1583-1590
• 文件大小：839 K

摘要

Hydrothermal method had been used to successfully synthesize the nanocrystalline spinel zinc manganese oxide (ZnMn₂O₄) directly from Zn(CH₃COO)₂·2H₂O, NaOH, Mn(NO₃)₂ and H₂O₂ at 170 °C for the reaction time of 48 h. The effects of the synthesis conditions, such as the Zn/Mn molar ratio, the reaction temperature, the reaction time, the zinc source and the concentrations of NaOH and H₂O₂, on the formation of the Zn–Mn spinel were investigated. The products were characterized by means of X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The results indicated that the compositions of the Zn–Mn spinel with the tetragonal structure were Zn_1.14Mn_1.86O₄. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) images showed that the products at 170 °C were with square-shaped nanocrystalline spinel with the particle size of about 20–50 nm. The thermal behaviors of the products were investigated by thermogravimetric analysis (TG).