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Premix-PICT拡散法で作製したMgB2超伝導バルク体の臨界電流特性に及ぼす微細組織の影響

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Title: Premix-PICT拡散法で作製したMgB2超伝導バルク体の臨界電流特性に及ぼす微細組織の影響
Other Titles: Influences of Microstructure on Critical Current Properties in MgB2 Superconducting Bulk Fabricated using a Premix-PICT Method
Authors: 嶋田, 雄介1 Browse this author
大橋, 徹也2 Browse this author
波多, 聰3 Browse this author
池田, 賢一4 Browse this author →KAKEN DB
中島, 英治5 Browse this author
望月, 利彦6 Browse this author
下山, 淳一7 Browse this author
堀井, 滋8 Browse this author
岸尾, 光二9 Browse this author
Authors(alt): Shimada, Yusuke1
Ohashi, Tetsuya2
Hata, Satoshi3
Ikeda, Ken-ichi4
Nakashima, Hideharu5
Mochizuki, Toshihiko6
Shimoyama, Jun-ichi7
Horii, Shigeru8
Kishio, Kohji9
Keywords: MgB2 bulk
microstructure
premix-powder-in-closed-tube (PICT) method
critical current density
flux pinning
Issue Date: Dec-2009
Publisher: 低温工学・超電導学会
Journal Title: 低温工学
Journal Title(alt): Journal of the Cryogenic Society of Japan
Volume: 44
Issue: 12
Start Page: 613
End Page: 620
Publisher DOI: 10.2221/jcsj.44.613
Abstract: We report relationships between the superconducting properties, microstructure and fabrication conditions in high-density MgB2 bulks fabricated using a premix-powder-in-closed-tube (PICT) method. The microstructure of the MgB2 bulks depends on the crystallinity of the initial B powders; use of crystalline B powders reduces the amount of MgB2 and increases re-sidual B and MgO. The heat treatment condition influences the grain sizes of MgB2 as well as the distribution and grain sizes of MgO. A lower temperature and a shorter duration of heat treatment tend to form fine grains of MgB2 and uniform dispersion of fine MgO particles. These microstructural variations influence the distribution of effective flux pinning centers such as grain boundaries and fine MgO particles. Different types of critical current density behavior as a function of magnetic field were meas-ured.
Type: article
URI: http://hdl.handle.net/2115/75356
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 池田 賢一

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