Nanosized GdVO4 powders synthesized by sol–gel method using different carboxylic acids

• 作 者: Sulawan Kaowphong Nawapong Chumha Piyarat Nimmanpipug Sila Kittiwachana
• 机 构: Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
• 出 处: 稀有金属（英文版）
• 发表日期: 2018年7期
• 关键词: GdVO4 Electron microscopy Sol–gel processes X-ray method

Nanosized GdVO4 powders were synthesized via a sol–gel method using different carboxylic acids as chelating agent, followed by calcination at 600 ℃ for 3 h. The effect of different carboxylic acids such as citric acid, malic acid, and tartaric acid on the characteristics of the nanosized GdVO4 powders was investigated. The GdVO4 powder was also synthesized without carboxylic acid for comparison. The thermal decomposition process of the car-boxylate precursors was investigated by thermogravimetric differential thermal analysis (TG-DTA). X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), and surface area measurement data were used to confirm the formation of nanocrystalline GdVO4 powders. It is found that the syn-thesis using the carboxylic acid with higher heat of com-bustion results in the powder with larger crystallite size. The difference in the steric effect of the acids used, which was evaluated by a computational method, also affects the degree of agglomeration of the synthesized powders.