Moderate concentration of citric acid for the formation of LaMnO3 and LaCoO3 nano-perovskites

作     者：Elham Ghiasi Azim Malekzadeh Mahnaz Ghiasi 

作者机构：School of Chemistry Damghan University 

出 版 物：《Journal of Rare Earths》 (稀土学报(英文版))

年 卷 期：2013年第31卷第10期

页      面：997-1002页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 081704[工学-应用化学] 07[理学] 08[工学] 070205[理学-凝聚态物理] 070301[理学-无机化学] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 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] 0702[理学-物理学] 

主　　题：mixed oxides LaMnO3 LaCoO3 nano-perovskite citric acid rare earths 

摘      要：Stoichiometric LaMnO3and LaCoO3nanoparticles were synthesized via calcination of a dried solution,containing molar ratio of La(NO3)3·6H2O/[Mn(NO3)2·4H2O or Co(NO3)2·6H2O]=1 and citric acid as disperser at temperature range of 600–900 oC for 5 *** role of organic additive concentration,which was 0.0,1.0,2.5 and 5 times of the total number of moles of the nitrate ions,was investigated on phase formation,morphology,extent of crystallization and particle size of the *** were characterized by X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM)and transmission electron microscopy(TEM)*** tendency of lanthanum ion toward manganese cation was observed to be more than to cobalt cation for the formation of LaBO3(B:Mn or Co)perovskite phase.A spongy product was formed on perovskite phase formation or in the presence of citric acid.A constructive or destructive effect was observed for the organic disperser on perovskite phase formation,which depended on mole of the citric acid.