Thermal–electrical transport of high purity, melt impregnated, polycrystalline MgB2
Thermal–electrical transport of high purity, melt impregnated, polycrystalline MgB2
In the polycrystalline superconductor MgB2 the fraction of cross section that carries electrical current was previously shown to be obtained from the normal state electrical resistivity. The latest single crystal measurements show the thermal transport properties of MgB2 to be dominated by electrical transport. For the first time we apply the electrical cross section to the thermal conductivity of three polycrystalline samples with different grain size and porosity. It is found that the results can be readily discussed in the context of granular thermal–electrical properties consisting of common temperature dependent transport properties independent of grain size and porosity. The result gives an alternative interpretation to the temperature dependent thermal transport than given in previous publications.
superconducting, MgB2, thermal conductivity, connectivity
085015-[5pp]
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Kulak, A.
b5932a7d-a10a-4862-ac32-a7a1e08be88b
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
7 July 2011
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Kulak, A.
b5932a7d-a10a-4862-ac32-a7a1e08be88b
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Young, E.A., Kulak, A. and Yang, Y.
(2011)
Thermal–electrical transport of high purity, melt impregnated, polycrystalline MgB2.
Superconductor Science and Technology, 24 (8), .
(doi:10.1088/0953-2048/24/8/085015).
Abstract
In the polycrystalline superconductor MgB2 the fraction of cross section that carries electrical current was previously shown to be obtained from the normal state electrical resistivity. The latest single crystal measurements show the thermal transport properties of MgB2 to be dominated by electrical transport. For the first time we apply the electrical cross section to the thermal conductivity of three polycrystalline samples with different grain size and porosity. It is found that the results can be readily discussed in the context of granular thermal–electrical properties consisting of common temperature dependent transport properties independent of grain size and porosity. The result gives an alternative interpretation to the temperature dependent thermal transport than given in previous publications.
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0953-2048_24_8_085015.pdf
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Published date: 7 July 2011
Keywords:
superconducting, MgB2, thermal conductivity, connectivity
Organisations:
Thermofluids and Superconductivity
Identifiers
Local EPrints ID: 67571
URI: http://eprints.soton.ac.uk/id/eprint/67571
ISSN: 0953-2048
PURE UUID: 3520a568-5f6c-408c-8790-2e1854dfd6aa
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Date deposited: 26 Aug 2009
Last modified: 14 Mar 2024 02:37
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Author:
A. Kulak
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