Effect of fine boron powders prepared with a self-propagating high temperature synthesis on flux pinning properties of the MgB₂/Fe composite wires

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• 作者：Young-Kuk Kim ; Kookchae Chung ; Jaimoo Yoo ; In-Hyuk Song ; Jaewoong Ko ; Woo-Hyun Chung ; Dong-Ho Kim ; Xiolin Wang ; Shi Xue Dou ; Pyung-Woo Shin
• 关键词：MgB₂ ; SHS ; Boron ; Superconducting wires
• 刊名：Journal of Alloys and Compounds
• 出版年：2009
• 出版时间：19 October 2009
• 年：2009
• 卷：485
• 期：1-2
• 页码：L44-L46
• 全文大小：482 K

文摘

Fine boron powders were prepared by a self-propagating high temperature synthesis (SHS) based on the reduction of boron oxide by magnesium (3Mg + B₂O₃ → 3MgO + 2B). The synthesized boron powders with SHS process showed small particle size (350 nm) with highly enlarged surface area. The MgB₂/Fe composite wire prepared with SHS-processed boron powders showed enhanced J_c properties under magnetic field. The major mechanism under this improvement was analyzed to be surface pinning by large number of grain boundaries owing to the small grain size of MgB₂.