CUED Publications database

The influence of a grain boundary on the thermal transport properties of bulk, melt-processed Y-Ba-Cu-O

Marchal, C and Fagnard, JF and Shi, YH and Cardwell, DA and Mucha, J and Misiorek, H and Cloots, R and Vertruyen, B and Vanderbemden, P (2012) The influence of a grain boundary on the thermal transport properties of bulk, melt-processed Y-Ba-Cu-O. Superconductor Science and Technology, 26. ISSN 0953-2048

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Abstract

We report the dependence of thermal conductivity, thermoelectric power and electrical resistivity on temperature for a bulk, large grain melt-processed Y-Ba-Cu-O (YBCO) high temperature superconductor (HTS) containing two grains separated by a well-defined grain boundary. Transport measurements at temperatures between 10 and 300 K were carried out both within one single grain (intra-granular properties) and across the grain boundary (inter-granular properties). The influence of an applied external magnetic field of up to 8 T on the measured sample properties was also investigated. The presence of the grain boundary is found to affect strongly the electrical resistivity of the melt-processed bulk sample, but has almost no effect on its thermoelectric power and thermal conductivity, within experimental error. The results of this study provide direct evidence that the heat flow in multi-granular melt-processed YBCO bulk samples should be virtually unaffected by the presence of grain boundaries in the material. © 2013 IOP Publishing Ltd.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:29
Last Modified: 08 Dec 2014 02:33
DOI: 10.1088/0953-2048/26/1/015006