| Autor: |
Rakov, D.N., Vorobieva, A.E., Konovalov, P.V., Kotova, E.V., Belotelova, Yu.N., Polikarpova, M.V. |
| Předmět: |
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| Zdroj: |
Physics Procedia; Dec2012, Vol. 36, p1480-1485, 6p |
| Abstrakt: |
Abstract: Superconducting properties of MgB2 wires with and without carbon doping up to 10 at.% have been investigated. Carbon particles consisted of 10 - 40nm nano-tubes or 10 – 20nm size SiC. Wires were made by “in-situ” technique. The regimes of ultrasound homogenization of the mixture of nano- and micro-particles were elaborated. Mixture homogeneity was determined by SEM analysis. The influence of carbon on MgB2 synthesis con ditions (temperature and anneal time), lattice parameters was studied by metallographic and X-ray analysis. Superconducting properties (Ic, Tc) of MgB2 wires were also studied. Tc value dropped from 39K for pure MgB2 to 35K in the case of carbontubes doping and to 32K in the case of SiC doping. Critical current density values in magnetic fields 2 – 12 T (4.2K) were compared for wires with pure and carbon-doped MgB2. Ic significant improvement was fixed in the fields higher than 4 T. [Copyright &y& Elsevier] |
| Databáze: |
Supplemental Index |
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