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

被引：6
|
作者：
Marchal, C. [1 ,2 ]
Fagnard, J. F. [1 ,2 ]
Shi, Y. H. [3 ]
Cardwell, D. A. [3 ]
Mucha, J. [4 ]
Misiorek, H. [4 ]
Cloots, R. [1 ,5 ]
Vertruyen, B. [1 ,5 ]
Vanderbemden, P. [1 ,2 ]
机构：
[1] SUPRATECS, B-4000 Liege, Belgium
[2] Dept Elect Engn & Comp Sci B28, B-4000 Liege, Belgium
[3] Univ Cambridge, Dept Engn, Bulk Superconduct Grp, Cambridge CB2 1PZ, England
[4] Polish Acad Sci, W Trzebiatowski Inst Low Temp & Struct Res, PL-50950 Wroclaw 2, Poland
[5] Dept Chem B6, B-4000 Liege, Belgium
来源：
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2013年 / 26卷 / 01期
基金：
英国工程与自然科学研究理事会;
关键词：
HIGH-TEMPERATURE SUPERCONDUCTORS; TRAPPED MAGNETIC-FIELD; THERMOELECTRIC-POWER; CRITICAL CURRENTS; SINGLE-GRAIN; AC LOSSES; CONDUCTIVITY; YBA2CU3O7-DELTA; MICROSTRUCTURE; THERMOPOWER;
D O I：
10.1088/0953-2048/26/1/015006
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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.
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页数：8
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