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Advances in Materials Science and Engineering
Volume 2012, Article ID 380306, 6 pages
http://dx.doi.org/10.1155/2012/380306
Research Article

Size Effect on the Structural and Magnetic Properties of Nanosized Perovskite LaFeO3 Prepared by Different Methods

1Department of Physics, College of Education, Hue University, 34 Le Loi, Hue City, Vietnam
2Faculty of Physics, Hanoi University of Sciences, VNU, 334 Nguyen Trai, Thanh Xuan, Hanoi City, Vietnam

Received 24 April 2012; Accepted 19 June 2012

Academic Editor: David Cann

Copyright © 2012 Nguyen Thi Thuy and Dang Le Minh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanosized LaFeO3 material was prepared by 3 methods: high energy milling, citrate gel, and coprecipitation. The X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) show that the orthorhombic LaFeO3 phase was well formed at a low sintering temperature of 500°C in the citrate-gel and co-precipitation methods. Scanning electron microscope (SEM) and transmission electron microscope (TEM) observations indicate that the particle size of the LaFeO3 powder varies from 10 nm to 50 nm depending on the preparation method. The magnetic properties through magnetization versus temperature 𝑀(𝑇) and magnetization verses magnetic field 𝑀(𝐻) characteristics show that the nano-LaFeO3 exhibits a weak ferromagnetic behavior in the room temperature, and the 𝑀(𝐻) curves are well fitted by Langevin functions.