کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990678 | 1516130 | 2018 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure of undoped and C-doped MgB2 wires prepared by an internal magnesium diffusion technique using different B powders
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
MgB2/Ti/Cu single core wires were prepared by IMD or MIMD techniques using four different B powders. The MgB2 microstructure was analysed by XRD, SEM and TEM to correlate it to the purity and particle size of the B precursors and resulting wire superconducting properties. No direct relation was observed between the B powder particle size and MgB2 grain size. A small residual content of Cl of about 1â¯wt% in the B precursor did not influence the MgB2 phase as it did not change its critical temperature Tc. However, as a Cl-rich compound remained distributed in an inter-grain space, it significantly decreased the wire critical current density Jc and MgB2 compactness. A difference in the Jc of two similar Cl-free MgB2 wires was attributed to the presence of many stacking faults and low-angle boundaries in MgB2 grains, which can act as additional pinning centres.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 764, 5 October 2018, Pages 437-445
Journal: Journal of Alloys and Compounds - Volume 764, 5 October 2018, Pages 437-445
نویسندگان
A. Rosová, I. HuÅ¡ek, M. Kulich, T. MeliÅ¡ek, P. KováÄ, E. DobroÄka, L. Kopera, J. Scheiter, W. HäÃler,