Nanosized GdVO_4 powders synthesized by sol-gel method using different carboxylic acids

作     者：Sulawan Kaowphong Nawapong Chumha Piyarat Nimmanpipug Sila Kittiwachana 

作者机构：Department of Chemistry Faculty of Science Chiang Mai University 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2018年第37卷第7期

页      面：561-567页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070301[理学-无机化学] 0702[理学-物理学] 

基　　金：financially supported by the Chiang Mai University (CMU) Junior Research Fellowship Program the National Research University (NRU) Project from Thailand's Office of the Higher Education Commission 

主　　题：GdV04 Electron microscopy Sol-gel processes X-ray method 

摘      要：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 synthesis using the carboxylic acid with higher heat of combustion 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.