聚丙烯酰胺溶胶凝胶法制备La_xSr_(1-x)MO_3纳米粉体

Preparation of La_xSr_(1-x)MO_3 Nanopowders by Polyacrylamide Sol-Gel Method

用一种新方法-聚丙烯酰胺溶胶凝胶法合成了广泛应用于中温固体氧化物燃料电池关键材料的钙钛矿型纳米粉体:La0.8Sr0.2MnO3(LSM)、La0.8Sr0.2CrO3(LSC)和La0.9Sr0.1Ga0.8Mg0.2O3(LSGM).用TG-DSC和X射线衍射仪分析了钙钛矿相的形成过程,以TEM观察了不同纳米粉体的颗粒尺寸及其形貌特征.研究结果表明聚丙烯酰胺溶胶凝胶法为省时、效率高的一种钙钛矿型复合氧化物纳米粉体制备过程,用该方法合成钙钛矿纳米粉体成相温度低,有利于提高纯度,有效降低团聚现象.

Perovskite-type nanopowders with applicability in intermediate temperature solid oxide fuel cells （ITSOFCs） were prepared by a new method based on a polyacrylamide sol-gel process： La0. 8Sr0. 2MnO3 （LSM）, La0.8Sr0.2CrO3（LSC） and La0.9Sr0. 1Ga0.8Mg0.2O3（LSGM）. The forming process of the perovskite phase of the samples was analyzed by means of TG-DSC and X-ray diffractometer. Under transmission electron microscope the particIe size and morphology feature of the samples were observed. The results reveal that the present polyacrylamide sol-gel method is a time-saving and efficient tool for easy synthesis of perovskite-type multicomponent oxide nanopowders. The method is advantageous to decrease the forming temperature of perovskite phase and agglomeration and to enhance purity .