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카본블랙이 도핑 된 $MgB_2$ 초전도체의 Ag 첨가의 영향
김효진,김현지,김찬중,박해웅,Kim, H.J.,Kim, H.J.,Kim, C.J.,Park, H.W. 한국초전도학회 2010 Progress in superconductivity Vol.12 No.1
In this work we synthesized both MgB2 and Carbon doped MgB2 superconductor with Ag addition via high energy milling and substituent heat treatment. Heat treatments were performed at $900\;^{\circ}C$ for 30 min in flowing Ar gas. We varied amount of Ag powder. In a range of Ag powder was 0~5wt%. The effect of Ag was correlated with superconducting properties. The results show a slight decrease in critical temperature ($T_c$) and a reduction of critical current density ($J_c$) at high fields for the Ag-doped samples as compared to the un-doped samples. Reduction of $J_c$ may be due to the formation of MgAg compound.