MICROSTRUCTURAL ANALYSIS OF CORE-SHELL STRUCTUREDMgB2SUPERCONDUCTING FIBERS FABRICATED BY HYBRID PHYSICAL CHEMICAL VAPOR DEPOSITION

Seong Gu Kang, Sung Chang Park, Jun-Ki Chung, Nam Hoon Lee, Won Nam Kang, Kyu Jeong Song, Tae-Keun Lee and Cheol Jin Kim
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Seong Gu Kang: Engineering Research Institute, Gyeongsang National University, Jinju 660-701, Korea
Sung Chang Park: Engineering Research Institute, Gyeongsang National University, Jinju 660-701, Korea
Jun-Ki Chung: Engineering Research Institute, Gyeongsang National University, Jinju 660-701, Korea
Nam Hoon Lee: Department of Physics, Sungkyunkwan University, Suwon 404-706, Korea
Won Nam Kang: Department of Physics, Sungkyunkwan University, Suwon 404-706, Korea
Kyu Jeong Song: Division of Science Education, Chonbuk National University, Jeonju 561-756, Korea
Tae-Keun Lee: Department of Materials Science and Engineering, Seoul National University of Technology, Seoul 139-743, Korea
Cheol Jin Kim: Engineering Research Institute, Gyeongsang National University, Jinju 660-701, Korea

Surface Review and Letters (SRL), 2010, vol. 17, issue 03, 289-292

Abstract: We have depositedMgB2thin films on the carbon fiber by hybrid physical–chemical vapor deposition (HPCVD) method which is known as the most effective technique for depositingMgB2thin films without pore formation. By adopting carbon fiber as substrate and gas phase reaction between diborane(B2H6)gas andMgvapor forMgB2formation, core-shell structuredMgB2/Ccomposite fiber could be synthesized. The high quality of the preparedMgB2fibers was confirmed with scanning electron microscopy (SEM), and the critical temperature(Tc)of the sample deposited at 590°C and 12 sccm flow rate ofB2H6was measured at ~40 K. The microstructures ofMgB2layer was characterized using transmission electron microscopy (TEM). The bright-field TEM images showedMgB2with the grain size of several nanometers. TheMgB2thin film showed highly dense microstructure without pore and well-connected to the carbon fiber interface. High-resolution TEM (HRTEM) images and scanning transmission electron microscopy (STEM) revealed the presence of interface phase betweenMgB2thin films and carbon fiber.

Keywords: MgB2; HPCVD; TEM; core-shell structure; MgB2/carbon fiber (search for similar items in EconPapers)
Date: 2010
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DOI: 10.1142/S0218625X10013692

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