A comparative study of the synthesis of nanocrystalline Yttrium Aluminium Garnet using sol-gel and co-precipitation methods
A comparative study of the synthesis of nanocrystalline Yttrium Aluminium Garnet using sol-gel and co-precipitation methods
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溶胶-凝胶法与共沉淀法合成纳米晶钇铝石榴石的对比研究
DOI：
10.1016/j.ceramint.2013.08.075
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发表时间：
2014
影响因子：
5.2
通讯作者：
Ramanujam P
中科院分区：
文献类型：
--
作者：
Ramanujam P
以硝酸盐为前驱体，采用溶胶-凝胶法和共沉淀法合成了纳米晶钇铝石榴石（nYAG）粉体。研究了这两种方法的热演化和结晶动力学。还研究了nYAG形成的最佳煅烧条件。发现共沉淀和溶胶-凝胶样品分别在925 °C/2 h和1000 °C/1 h下观察到完全转变为nYAG。在900 °C下，无论采用何种合成方法，所有粉末均形成了中间相YAlO 3。从TEM获得的粉末形态显示出两种途径的非常相似的颗粒尺寸（20-30 nm）;而溶胶-凝胶法的团聚程度更高。还观察到，通过将pH控制在窄范围内，保持沉淀物处理温度并使用正丁醇处理使沉淀物中过量的OH-离子脱水，共沉淀的nYAG粉末中的团聚程度进一步降低。
Nanocrystalline yttrium aluminium garnet (nYAG) powder has been synthesized via sol-gel and co-precipitation methods using nitrate precursors. Thermal evolution and crystallisation kinetics of both the methods were investigated. The optimised calcination condition for the formation of nYAG was also examined. It was found that a complete transformation to nYAG was observed at 925 °C/2 h and 1000 °C/1 h for the coprecipitation and sol-gel samples respectively. An intermediate YAlO3phase was formed at 900 °C in all powders regardless of the synthesis methods. The powder morphologies obtained from TEM revealed very similar particle sizes for the two routes (20–30 nm); whilst the extent of agglomeration was higher for the sol-gel method. It was also observed that by controlling the pH in a narrow range, maintaining the precipitate processing temperature and dehydrating excess OH- ions in the precipitates using n-butanol treatment, the extent of agglomeration was further reduced in the co-precipitated nYAG powder.