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Effect of sintering temperature on the microstructure, electrical and magnetotransport properties of La0.67Sr0.33MnO3 compound


Citation

Lim, Kean Pah and Shaari, Abdul Halim and Chen, Soo Kien and Chin, Hui Wei and Gan, Albert and Ng, Siau Wei and Chong, Kuen Hou (2014) Effect of sintering temperature on the microstructure, electrical and magnetotransport properties of La0.67Sr0.33MnO3 compound. Advanced Materials Research, 895. pp. 319-322. ISSN 1022-6680; ESSN: 1662-8985

Abstract

In this work, we report the effect of sintering temperature (900°C, 1000°C, 1100°C and 1200°C) on the electrical and magnetotransport properties of polycrystalline La0.67Sr0.33MnO3 (LSMO). Single phase of LSMO hexagonal structure (R-3c) accompanied with minor phases was successfully synthesized by co-precipitation method. With increasing sintering temperature, grain growth was promoted and grain connectivity was improved. It was found that an enhancement of resistivity on smaller grain size was due to larger grain surface over volume (grain boundaries effect). The shifting of the metal-insulator transition (TMI) to higher temperature was also responsible for observed changes in physical properties. TMI of 900°C, 1000°C and 1100°C were 232 K, 278 K and 298 K respectively however 1200°C was out of measurement range (higher than 300 K). In summary, CP900 with smaller grain size distribution (~200 nm) displayed the highest resistivity and MR% of -19.2% (at 80 K, 10 kG).


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.4028/www.scientific.net/AMR.895.319
Publisher: Trans Tech Publications
Keywords: Grain size; Magnetoresistivity; Sintering effect
Depositing User: Nabilah Mustapa
Date Deposited: 18 Dec 2015 05:27
Last Modified: 18 Dec 2015 05:27
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.4028/www.scientific.net/AMR.895.319
URI: http://psasir.upm.edu.my/id/eprint/37309
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