期刊
JAPANESE JOURNAL OF APPLIED PHYSICS
卷 51, 期 1, 页码 -出版社
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.51.010105
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资金
- Japan Society for the Promotion of Science [23246110, 22860019]
- Grants-in-Aid for Scientific Research [23246110, 22860019] Funding Source: KAKEN
The two most common types of MgB2 conductor fabrication technique-in-situ and ex-situ-show increasing conflicts concerning the connectivity, an effective current-carrying cross-sectional area. An in-situ reaction yields a strong intergrain coupling with a low packing factor, while an ex-situ process using pre-reacted MgB2 yields tightly packed grains, however, their coupling is much weaker. We studied the normal-state resistivity and microstructure of ex-situ MgB2 bulks synthesized with varied heating conditions under ambient pressure. The samples heated at moderately high temperatures of similar to 900 degrees C for a long period showed an increased packing factor, a larger intergrain contact area and a significantly decreased resistivity, all of which indicate the solid-state self-sintering of MgB2. Consequently the connectivity of the sintered ex-situ samples exceeded the typical connectivity range 5-15% of the in-situ samples. Our results show self-sintering develops the superior connectivity potential of ex-situ MgB2, though its intergrain coupling is not yet fulfilled, to provide a strong possibility of twice or even much higher connectivity in optimally sintered ex-situ MgB2 than in in-situ MgB2. (C) 2012 The Japan Society of Applied Physics
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