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Mg/B化學(xué)計(jì)量比對(duì)MgB2超導(dǎo)電性和磁通釘扎性能的影響
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國(guó)家自然科學(xué)基金(50588201, 50872116)；高等學(xué)校博士學(xué)科點(diǎn)專項(xiàng)科研基金(200806130023)；國(guó)家重大基礎(chǔ)研究“973”項(xiàng)目 (2007CB616906)


Influence of Different Mg/B Stoichiometry on Superconductivity and Flux Pinning Properties of MgB2 Bulks
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    摘要:

    采用固相反應(yīng)法制備一系列的MgxB2 (x＝0.90, 0.95, 1.0, 1.05, 1.10)超導(dǎo)塊材，并詳細(xì)研究不同Mg/B化學(xué)計(jì)量比對(duì)MgB2超導(dǎo)性能的影響。采用X射線衍射(XRD)儀，掃描電鏡( SEM)和超導(dǎo)量子干涉(MPMS)儀分別對(duì)樣品的物相、微觀結(jié)構(gòu)和超導(dǎo)性能進(jìn)行表征。結(jié)果表明：名義組分為Mg0.95B2的樣品臨界電流密度Jc性能最好。由于Mg的不足，抑制了晶粒生長(zhǎng)，同時(shí)也使得MgB2內(nèi)部Mg缺位、△Tc、FWHM、Hc2和Hirr明顯增加，顯著改善MgB2的磁通釘扎性能

    Abstract:

    A series of MgxB2 (x=0.9, 0.95, 1.0, 1.05, 1.10) bulks samples were prepared by the in-situ solid-state reaction method, and then the effects of Mg/B stoichiometry on superconductivity and flux pinning properties of MgB2 were discussed. Phase purity, microstructure and superconducting properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and magnetic properties measurement system (MPMS), respectively. The results show that the sample with a nominal composition, Mg0.95B2 has the highest Jc value among all the samples. In the Mg-deficient MgB2, the degraded grains grow and lack of Mg sites are responsible to significant enhancement of the Hirr and Hc2 and the enlarged △Tc and FWHM, resulting in the great improvement of flux pinning properties of MgB2

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李 飛,潘熙鋒,C. H. Cheng,周杰俤,楊 燁,趙 勇. Mg/B化學(xué)計(jì)量比對(duì)MgB2超導(dǎo)電性和磁通釘扎性能的影響[J].稀有金屬材料與工程,2011,40(5):863~866.[Li Fei, Pan Xifeng, C. H. Cheng, Zhou Jiedi, Yang Ye, Zhao Yong. Influence of Different Mg/B Stoichiometry on Superconductivity and Flux Pinning Properties of MgB2 Bulks[J]. Rare Metal Materials and Engineering,2011,40(5):863~866.]
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  • 收稿日期:2010-05-25
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