Combustion synthesis and characterization of nano-crystalline LaFeO3 powder

被引：53

作者：

Shen, Hui ^{[1
,2
,3
]}

Cheng, Guofeng ^{[1
]}

Wu, Anhua ^{[1
]}

Xu, Jiayue ^{[1
,3
]}

Zhao, Jingtai ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

[3] Shanghai Inst Technol, Sch Mat Sci & Engn, Shanghai 200235, Peoples R China

来源：

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE | 2009年 / 206卷 / 07期

基金：

中国国家自然科学基金; 国家高技术研究发展计划(863计划);

关键词：

RARE-EARTH ORTHOFERRITES; MAGNETIC-PROPERTIES; NANOCRYSTALLINE; PRECURSOR;

D O I：

10.1002/pssa.200824266

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nano-crystalline LaFeO3 was synthesized by a sol-gel autocombustion method from a mixed aqueous solution of lanthanum and iron nitride, using citric acid as the fuel. Powder X-ray diffraction and TG/DTA analysis show that the LaFeO3 crystallites can be directly obtained by the sol-gel combustion process, without any other undesired phase. The results of SEM and TEM reveal that the as-burnt samples and powder calcined at 700 degrees C are agglomerated with particle size in the range of 25-50 nm and 60-80 nm, respecitvely. The M(T) and M(H) curves measurements show the existence of a weak ferromagnetism and the mainly anti-ferromagnetic ordering of the spins in the calcined sample. Compared with the powder calcined at 600 degrees C and 700 degrees C, the as-burnt LaFeO3 exhibits much stronger ferromagnetic behavior, with larger magnetization and smaller coercive field. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：1420 / 1424

页数：5

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