K. C. Chung, M.Ranot, K. P. Shinde, Y. S. Oh, S. H. Kang, S. H. Jang, D. Y. Hwang
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영어(ENG)
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https://www.earticle.net/Article/A357149
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※ 학술발표대회집, 워크숍 자료집 중 4페이지 이내 논문은 '요약'만 제공되는 경우가 있으니, 구매 전에 간행물명, 페이지 수 확인 부탁 드립니다.
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초록
영어
Effects of the spherically shaped Ge and the rod-like carbon-coated Ge on the superconducting properties of MgB2 were investigated. Pure Ge and carbon-coated Ge nano-powders were synthesized under the different amount of CH4 (0 to 5 kPa) by using DC thermal plasma method. When the CH4 was added ~100 nm sized Ge with a spherical shape changed to rod-like morphology with a diameter of ~30-70 nm and a length of ~400-500 nm. Also it was confirmed that thin carbon layers of a few nanometers were formed along the rod length and the agglomerated carbons were found on the edges of rods. Pure spherical Ge and Ge/C rods were mixed and milled with Mg & B precursor to form the doped MgB2 bulk samples by the solid-state reaction method. Almost no change of Tc was noticed for the pure Ge-added MgB2, whereas Tc was found to decrease with the Ge/C-added MgB2 samples. It was found that the pure spherical Ge showed to have a negative effect on the flux pinning of MgB2. However, Ge/C rods can enhance the flux pinning property of Jc due to the coated carbon on Ge rods.
K. C. Chung [ Korea Institute of Materials Science, Changwon 51508, Republic of Korea ]
Corresponding Author
M.Ranot [ Korea Institute of Materials Science, Changwon 51508, Republic of Korea, Department of Physics, Bangalore University, Bangalore 560056, India ]
K. P. Shinde [ Korea Institute of Materials Science, Changwon 51508, Republic of Korea, Department of Physics, Chungbuk National University, Cheongju 28644, republic of Korea ]
Y. S. Oh [ Korea Institute of Materials Science, Changwon 51508, Republic of Korea ]
S. H. Kang [ Korea Institute of Materials Science, Changwon 51508, Republic of Korea ]
S. H. Jang [ Kiswire Advanced Technology Ltd, Daejeon 34026, Republic of Korea ]
D. Y. Hwang [ Kiswire Advanced Technology Ltd, Daejeon 34026, Republic of Korea ]