Simple calculation of the anisotropic 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 Mg1.2B2 samples were prepared by the conventional solid state reaction method. Three pellets were annealed at temperature r...

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Main Authors:	Adam .M.I, Aris .M.F.M, Chen .S.K, Halim .S.A
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2011
Online Access:	http://journalarticle.ukm.my/2616/ http://journalarticle.ukm.my/2616/ http://journalarticle.ukm.my/2616/1/14_M.I._Adam.pdf

id	ukm-2616
recordtype	eprints
spelling	ukm-26162016-12-14T06:32:08Z http://journalarticle.ukm.my/2616/ Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter Adam .M.I, Aris .M.F.M, Chen .S.K, Halim .S.A, 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 Mg1.2B2 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, Jc in 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 Universiti Kebangsaan Malaysia 2011-08 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/2616/1/14_M.I._Adam.pdf Adam .M.I, and Aris .M.F.M, and Chen .S.K, and Halim .S.A, (2011) Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter. Sains Malaysiana, 40 (8). pp. 913-919. ISSN 0126-6039 http://www.ukm.my/jsm/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
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 Mg1.2B2 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, Jc in 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	Adam .M.I, Aris .M.F.M, Chen .S.K, Halim .S.A,
spellingShingle	Adam .M.I, Aris .M.F.M, Chen .S.K, Halim .S.A, Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter
author_facet	Adam .M.I, Aris .M.F.M, Chen .S.K, Halim .S.A,
author_sort	Adam .M.I,
title	Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter
title_short	Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter
title_full	Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter
title_fullStr	Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter
title_full_unstemmed	Simple calculation of the anisotropic factor for minimum current path in MgB2 material using the extrapolated kramer field as priori parameter
title_sort	simple calculation of the anisotropic factor for minimum current path in mgb2 material using the extrapolated kramer field as priori parameter
publisher	Universiti Kebangsaan Malaysia
publishDate	2011
url	http://journalarticle.ukm.my/2616/ http://journalarticle.ukm.my/2616/ http://journalarticle.ukm.my/2616/1/14_M.I._Adam.pdf
first_indexed	2023-09-18T19:36:33Z
last_indexed	2023-09-18T19:36:33Z
_version_	1777405309956915200

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

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