Nagabhushana, B M and Chakradhar, R P S and Ramesh, K P and Prasad, V and Shivakumara, C and Chandrappa, G T (2010) Effect of fuel on the formation structure, transport and magnetic properties of LaMnO3+nanopowders. Philosophical Magazine, 90 (15). pp. 2009-2025. ISSN 1478-6435

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Single-step low-temperature solution combustion (LCS) synthesis was adopted for the preparation of LaMnO3+ (LM) nanopowders. The powders were well characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), surface area and Fourier transform infrared spectroscopy (FTIR). The PXRD of as-formed LM showed a cubic phase but, upon calcination (900 degrees C, 6 h), it transformed into a rhombohedral phase. The effect of fuel on the formation of LM was examined, and its structure and magnetoresistance properties were investigated. Magnetoresistance (MR) measurements on LM were carried out at 0, 1, 4 and 7 T between 300 and 10 K. LM (fuel-to-oxidizer ratio; = 1) showed an MR of 17% at 1 T, whereas, for 4 and 7 T, it exhibited an MR of 45 and 55%, respectively, near the TM-I. Metallic resistivity data below TM-I showed that the double exchange interaction played a major role in this compound. It was interesting to observe that the sample calcined at 1200 degrees C for 3 h exhibited insulator behavior.

Item Type: Article
Uncontrolled Keywords: Combustion synthesis; Nanomaterials; Manganites; Magnetoresistance; PXRD; SEM; FTIR
Subjects: Glass
Depositing User: Bidhan Chaudhuri
Date Deposited: 14 Feb 2012 12:40
Last Modified: 29 Mar 2016 06:52

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