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Journal of Nanomaterials
Volume 2012 (2012), Article ID 426037, 5 pages
http://dx.doi.org/10.1155/2012/426037
Research Article

The Effect of Reducing Time on the Magnetoresistance of Manganite La0.67Sr0.20Cu0.10 0.03MnO3 at a Temperature of 30°C

1College of Science, Hebei United University, Tangshan 063009, China
2Departmen of Basic Teaching, Tangshan College, Tangshan 063000, China

Received 18 July 2012; Revised 8 October 2012; Accepted 18 October 2012

Academic Editor: Gang Xiang

Copyright © 2012 Hongwei Zhao et al. 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

La0.67Sr0.20Cu0.10 0.03MnO3 (“ ” representing cation vacancy) polycrystalline manganite powder was synthesized by sol-gel method, which we used as parent materials. After reduced in hydrogen atmosphere for 30 and 60 minutes at a temperature of 400°C, the series bulk samples were obtained by sintering in argon atmosphere for 12 hours at 1100°C. The structure, electrical and magnetic properties, and colossal magnetoresistance of samples were researched in detail. Experiment results indicate that under an applied magnetic field of 1.8 T, the two bulk samples sintered in Ar atmosphere for 12 hours at 1100°C, with the powder reduced for 30 and 60 minutes in 400°C hydrogen atmosphere for La0.67Sr0.20Cu0.10 0.03MnO3 parent powders, respectively, have the stable MR (11.0 ± 0.3)% and (10.0 ± 0.5)% in temperature region from 270 K to 330 K. this is important for the potential application of this kind of magnetoresistance materials.