Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter

The volume flux pinning force density of MgxB2 (x = 0.8, 1.0 and 1.2) materials was calculated for grains boundary and point pinning potentials. Stoichiometric Mg0.8, MgB2, and Mg 1.2B2 samples were prepared by the conventional solid state reaction method. Three pellets were annealed at temperatur...

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Main Authors: Ahmed, Malik Idries Adam, Mohd Aris, Mohd Faisal, Chen, Soo Kien, Shaari, Abdul Halim
Format: Article
Language:English
Published: Penerbit Universiti Kebangsaan Malaysia 2011
Online Access:http://psasir.upm.edu.my/id/eprint/25275/1/Simple%20calculation%20of%20the%20anistropic%20factor%20for%20minimum%20current%20path%20in%20MgB2%20material%20using%20the%20extrapolated%20Kramer%20field%20as%20priori%20parameter.pdf
http://psasir.upm.edu.my/id/eprint/25275/
http://www.ukm.my/jsm/english_journals/vol40num8_2011/contentsVol40num8_2011.html
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spelling my.upm.eprints.252752018-10-16T04:40:37Z http://psasir.upm.edu.my/id/eprint/25275/ Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter Ahmed, Malik Idries Adam Mohd Aris, Mohd Faisal Chen, Soo Kien Shaari, Abdul Halim The volume flux pinning force density of MgxB2 (x = 0.8, 1.0 and 1.2) materials was calculated for grains boundary and point pinning potentials. Stoichiometric Mg0.8, MgB2, and Mg 1.2B2 samples were prepared by the conventional solid state reaction method. Three pellets were annealed at temperature range of 650-800°C. Structural analysis revealed large values for FWHM at (hkl) (110)(°) which indicates distortion in the boron plane of these specimens. The a and c – axis lattice parameters showed respective contraction and elongation with the increase in processing temperature. The low crystallinity found in Mg0.8B2 and Mg1.2B2 specimens was concluded to be due to structural defects, which act as flux pinning centres. Experimental anisotropic factor and the minimum fraction for current path, obtained from the framework of current percolation theory were used to explain the strong field dependence of the critical current density, Jcin the specimens. The summit of the maximum pinning force density was shifted to lower magnetic field position with the increase of anisotropy. The scaling laws were employed in a Kramer– like field in order to identify the dominant pinning mechanism correspondence to the summit of maximum pinning. For MgB2 specimens however, a renormalization field based on the current percolation exposition is considered for the identification of their dominant pinning since it is very difficult to account for the flat behaviour of the pinning force in the weakened current region of these specimens. Penerbit Universiti Kebangsaan Malaysia 2011 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/25275/1/Simple%20calculation%20of%20the%20anistropic%20factor%20for%20minimum%20current%20path%20in%20MgB2%20material%20using%20the%20extrapolated%20Kramer%20field%20as%20priori%20parameter.pdf Ahmed, Malik Idries Adam and Mohd Aris, Mohd Faisal and Chen, Soo Kien and Shaari, Abdul Halim (2011) Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter. Sains Malaysiana, 40 (8). pp. 913-919. ISSN 0026-6039 http://www.ukm.my/jsm/english_journals/vol40num8_2011/contentsVol40num8_2011.html
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description The volume flux pinning force density of MgxB2 (x = 0.8, 1.0 and 1.2) materials was calculated for grains boundary and point pinning potentials. Stoichiometric Mg0.8, MgB2, and Mg 1.2B2 samples were prepared by the conventional solid state reaction method. Three pellets were annealed at temperature range of 650-800°C. Structural analysis revealed large values for FWHM at (hkl) (110)(°) which indicates distortion in the boron plane of these specimens. The a and c – axis lattice parameters showed respective contraction and elongation with the increase in processing temperature. The low crystallinity found in Mg0.8B2 and Mg1.2B2 specimens was concluded to be due to structural defects, which act as flux pinning centres. Experimental anisotropic factor and the minimum fraction for current path, obtained from the framework of current percolation theory were used to explain the strong field dependence of the critical current density, Jcin the specimens. The summit of the maximum pinning force density was shifted to lower magnetic field position with the increase of anisotropy. The scaling laws were employed in a Kramer– like field in order to identify the dominant pinning mechanism correspondence to the summit of maximum pinning. For MgB2 specimens however, a renormalization field based on the current percolation exposition is considered for the identification of their dominant pinning since it is very difficult to account for the flat behaviour of the pinning force in the weakened current region of these specimens.
format Article
author Ahmed, Malik Idries Adam
Mohd Aris, Mohd Faisal
Chen, Soo Kien
Shaari, Abdul Halim
spellingShingle Ahmed, Malik Idries Adam
Mohd Aris, Mohd Faisal
Chen, Soo Kien
Shaari, Abdul Halim
Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter
author_facet Ahmed, Malik Idries Adam
Mohd Aris, Mohd Faisal
Chen, Soo Kien
Shaari, Abdul Halim
author_sort Ahmed, Malik Idries Adam
title Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter
title_short Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter
title_full Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter
title_fullStr Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter
title_full_unstemmed Simple calculation of the anistropic factor for minimum current path in MgB2 material using the extrapolated Kramer field as priori parameter
title_sort simple calculation of the anistropic factor for minimum current path in mgb2 material using the extrapolated kramer field as priori parameter
publisher Penerbit Universiti Kebangsaan Malaysia
publishDate 2011
url http://psasir.upm.edu.my/id/eprint/25275/1/Simple%20calculation%20of%20the%20anistropic%20factor%20for%20minimum%20current%20path%20in%20MgB2%20material%20using%20the%20extrapolated%20Kramer%20field%20as%20priori%20parameter.pdf
http://psasir.upm.edu.my/id/eprint/25275/
http://www.ukm.my/jsm/english_journals/vol40num8_2011/contentsVol40num8_2011.html
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score 13.222552