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/ http://psasir.upm.edu.my/id/eprint/14211/ http://psasir.upm.edu.my/id/eprint/14211/1/Effect%20of%20Co%20substitution%20on%20magnetic%20and%20magnetoresistance%20effect%20in%20La0.pdf

id	upm-14211
recordtype	eprints
spelling	upm-142112015-10-22T00:40:50Z 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/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Putra Malaysia
building	UPM Institutional Repository
collection	Online Access
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/ http://psasir.upm.edu.my/id/eprint/14211/ http://psasir.upm.edu.my/id/eprint/14211/1/Effect%20of%20Co%20substitution%20on%20magnetic%20and%20magnetoresistance%20effect%20in%20La0.pdf
first_indexed	2018-09-07T13:29:45Z
last_indexed	2018-09-07T13:29:45Z
_version_	1610955604794277888

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

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