期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 608, 期 -, 页码 102-109出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.04.017
关键词
MgB2 bulks; Microstructure analysis; Critical current density (J(c)); Flux pinning; Trapped field magnets
The present investigation focuses on the effects of various sintering temperatures on the critical current densities and the trapped field values of disk-shaped bulk MgB2 superconductors fabricated with a simple solid state reaction. The samples were prepared by varying the sintering temperature from 750 to 950 degrees C in pure Ar atmosphere. Scanning electron microscopy (SEM) and X-ray diffraction analyses showed that single phase and homogenous MgB2 bulks are produced in using sintering temperatures in the range of 750-825 degrees C. The samples sintered at 775 degrees C showed the highest critical current density (J(c)) values of 250 kA/cm(2) at 10 K and 181 kA/cm(2) at 20 K in self field. We also measured the trapped field values at 20 K for bulk MgB2 samples 20 mm in diameter and 7 mm in thickness, sintered at temperatures in the range of 700-950 degrees C with the same sintering duration of 3 h. Almost all the samples exhibited the trapped field values higher than 1 T, which shows the high potential of sintered MgB2 bulk materials as trapped field magnets. The highest value of 1.51 T at 20 K was achieved in the MgB2 sample sintered at 775 degrees C, reflecting its high pinning performance and homogeneous microstructure. (C) 2014 Elsevier B.V. All rights reserved.
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