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Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system

A series of polycrystalline perovskite manganite of La0.67(Ba1-xCox)0.33MnO3 (x=0.00, 0.30 and 0.50) were prepared by conventional solid-state route. XRD spectrum indicates that single phase rhombohedral perovskite structure had been obtained for x=0.00 sample. When Co is introduced in the Ba site,...

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Main Authors: Wong, Jen Kuen, Lim, Kean Pah, Shaari, Abdul Halim, Chen, Soo Kien, Ng, Siau Wei
Format: Article
Language:English
Published: Malaysian Solid State Science and Technology Society 2009
Online Access:http://psasir.upm.edu.my/id/eprint/14211/1/Effect%20of%20Co%20substitution%20on%20magnetic%20and%20magnetoresistance%20effect%20in%20La0.pdf
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spelling oai:psasir.upm.edu.my:14211 http://psasir.upm.edu.my/id/eprint/14211/ Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system Wong, Jen Kuen Lim, Kean Pah Shaari, Abdul Halim Chen, Soo Kien Ng, Siau Wei A series of polycrystalline perovskite manganite of La0.67(Ba1-xCox)0.33MnO3 (x=0.00, 0.30 and 0.50) were prepared by conventional solid-state route. XRD spectrum indicates that single phase rhombohedral perovskite structure had been obtained for x=0.00 sample. When Co is introduced in the Ba site, its structure is distorted from rhombohedral to pseudo-cubic. The SEM images show that the average grain sizes were found to be in 3-8µm (x=0.30) and 2-10µm (x=0.50) with less pore between the grain. For x=0.00, the sample is found in melted condition where no significant clear grain boundary can be found. Pure sample had TC of 343K. However, substitution of Co at Ba site brings down the Curie temperature, TC below 293K. Pure (x=0.0) sample shows Low Field Magnetoresistance (LFMR) effect and the effect weakens when Co is introduced. The highest low-field MR value is -13.0% for sample with x=0.00 in 0.1Tesla applied external magnetic field at 90K and the highest MR value of -22.5% is given by x=0.30 sample at 1Tesla applied magnetic field at 90K. Hence, these indicated that Co will not enhance the extrinsic MR which is due to the grain boundary effect and tend to destroy the LFMR effect. Malaysian Solid State Science and Technology Society 2009 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/14211/1/Effect%20of%20Co%20substitution%20on%20magnetic%20and%20magnetoresistance%20effect%20in%20La0.pdf Wong, Jen Kuen and Lim, Kean Pah and Shaari, Abdul Halim and Chen, Soo Kien and Ng, Siau Wei (2009) Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system. Solid State Science and Technology, 17 (2). pp. 75-81. ISSN 0128-7389 http://journal.masshp.net/volume-17-no-2-2009/
institution UPM IR
collection UPM IR
language English
description A series of polycrystalline perovskite manganite of La0.67(Ba1-xCox)0.33MnO3 (x=0.00, 0.30 and 0.50) were prepared by conventional solid-state route. XRD spectrum indicates that single phase rhombohedral perovskite structure had been obtained for x=0.00 sample. When Co is introduced in the Ba site, its structure is distorted from rhombohedral to pseudo-cubic. The SEM images show that the average grain sizes were found to be in 3-8µm (x=0.30) and 2-10µm (x=0.50) with less pore between the grain. For x=0.00, the sample is found in melted condition where no significant clear grain boundary can be found. Pure sample had TC of 343K. However, substitution of Co at Ba site brings down the Curie temperature, TC below 293K. Pure (x=0.0) sample shows Low Field Magnetoresistance (LFMR) effect and the effect weakens when Co is introduced. The highest low-field MR value is -13.0% for sample with x=0.00 in 0.1Tesla applied external magnetic field at 90K and the highest MR value of -22.5% is given by x=0.30 sample at 1Tesla applied magnetic field at 90K. Hence, these indicated that Co will not enhance the extrinsic MR which is due to the grain boundary effect and tend to destroy the LFMR effect.
format Article
author Wong, Jen Kuen
Lim, Kean Pah
Shaari, Abdul Halim
Chen, Soo Kien
Ng, Siau Wei
spellingShingle Wong, Jen Kuen
Lim, Kean Pah
Shaari, Abdul Halim
Chen, Soo Kien
Ng, Siau Wei
Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system
author_facet Wong, Jen Kuen
Lim, Kean Pah
Shaari, Abdul Halim
Chen, Soo Kien
Ng, Siau Wei
author_sort Wong, Jen Kuen
title Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system
title_short Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system
title_full Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system
title_fullStr Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system
title_full_unstemmed Effect of Co substitution on magnetic and magnetoresistance effect in La0.67(Ba1-xCox)0.33mno3 system
title_sort effect of co substitution on magnetic and magnetoresistance effect in la0.67(ba1-xcox)0.33mno3 system
publisher Malaysian Solid State Science and Technology Society
publishDate 2009
url http://psasir.upm.edu.my/id/eprint/14211/1/Effect%20of%20Co%20substitution%20on%20magnetic%20and%20magnetoresistance%20effect%20in%20La0.pdf
_version_ 1819293791539953664
score 13.4562235

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