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Effect of rare earth elements substitution in La site for LaMnO3 Manganites


Citation

Wong, Jen Kuen and Lim, Kean Pah and Shaari, Abdul Halim and Chen, Soo Kien and Ng, Siau Wei and Gan, Albert Han Ming (2012) Effect of rare earth elements substitution in La site for LaMnO3 Manganites. Pertanika Journal of Science & Technology, 20 (1). pp. 81-88. ISSN 0128-7680; ESSN: 2231-8526

Abstract / Synopsis

With a view to understanding the effect of rare earth element (Ce, Pr, Nd, Sm and Gd) substitution for the La site in LaMnO3 (LMO), the samples were prepared via solid-state reaction. Structure investigation by X-ray diffraction (XRD) showed that structure transformation from trigonal (LMO) to orthorhombic (PMO, NMO, SMO and GMO) occurred when smaller trivalent rare earth element was replaced. The MnO6octahedra were tilted and elongated or compressed, corresponding to the ionic radii of the rare earth inserted. Meanwhile, microstructure study using scanning electron microscopy (SEM) illustrated that La substitution by another rare earth element caused a reduction in grain size. This might due to the changes in enthalpy of fusion by other rare earth ions, where higher enthalpy of fusion favours formation of smaller grain size. However, CeMnO3 did not form under this preparation condition. The magnetic properties studied from the hysteresis plot taken at room temperature indicated that the substitution of La with other magnetic trivalent rare earth ions strongly weakened the magnetic strength of the system.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Universiti Putra Malaysia Press
Keywords: Magnetic material; Manganite perovskite; Rare-earth ions; Rietveld refinement; Structure transformation
Depositing User: Najah Mohd Ali
Date Deposited: 04 Nov 2015 10:09
Last Modified: 04 Nov 2015 10:09
URI: http://psasir.upm.edu.my/id/eprint/40435
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