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以硝酸镧和硝酸铜为起始原料、水为溶剂、柠檬酸为络合剂,采用溶胶-凝胶法制备La2CuO4微晶。通过热重-差热分析、X射线衍射、红外光谱和透射电子显微镜等表征前驱物凝胶粉体及La2CuO4粉体的热性能、物相组成、官能团及显微结构,用Kissinger法研究La2CuO4微晶的合成活化能。结果表明采用溶胶-凝胶法可以成功制备La2CuO4微晶:600℃煅烧2 h可获得单一物相的La2CuO4;煅烧温度升至700℃后,La2CuO4晶粒形状为正交晶型结构,晶粒尺寸100～120 nm,晶粒分布比较均匀。计算得到La2CuO4微晶的合成活化能为147.0 kJ/mol。
La2CuO4 crystallites were prepared by sol-gel method using lanthanum nitrate and cupric nitrate as starting materials, water as solvent and citric acid as complexing agent. The thermal properties, phase composition, functional groups and microstructure of precursor powders and La2CuO4 powders were characterized by TG-DTA, X-ray diffraction, FTIR and transmission electron microscopy. Synthetic activation energy of crystals. The results show that the La2CuO4 crystallites can be successfully prepared by sol-gel method. Single phase La2CuO4 can be obtained by calcination at 600 ℃ for 2 h. When calcined at 700 ℃, the grain shape of La2CuO4 is orthorhombic and the grain size 100 ~ 120 nm, the grain distribution is more uniform. The calculated activation energy of La2CuO4 crystallite is 147.0 kJ / mol.