화학공학소재연구정보센터
Applied Surface Science, Vol.380, 52-59, 2016
Optical and magnetic properties of La1-xGaxFeO3 nanoparticles synthesized by polymerization complex method
La1-xGaxFeO3 (x = 0.0, 0.1, 0.2, 0.3 and 0.4) nanoparticles were synthesized by polymerization complex method. X-ray diffraction (XRD) results reveal a pure orthorhombic phase structure. Increasing of Ga content, resulting in the decrease of average crystallite sizes calculated by XRD from 58.4 +/- 5.9 to 13.4 +/- 4.3 nm and the average particle sizes estimated by transmission electron microscope (TEM) images from 70.2 +/- 4.5 to 21.4 +/- 8.5 nm. The optical band gaps determined by UV-vis spectra showed a redshift from 2.145 to 1.954 eV that originates from surface effect caused by Ga substitution. The magnetic properties were investigated using a vibrating sample magnetometer (VSM). The room temperature hysteresis loops of La1-xGaxFeO3 nanopowders indicate the antiferromagnetic behavior of pure sample and all doped samples of ferromagnetic behavior with the enhancement of coercive field (He), remanence (Me) and magnetization (M) due to the more disordering spins induced at the surface of particle. It is evident from field cool (FC) measurement of La0.6Ga0.4FeO3 sample that the Curie temperature (TT) is above 350K. (C) 2016 Elsevier B.V. All rights reserved.