Abstract
Carbon was known to be one of effective additives which can improve the flux pinning of <TEX>$MgB_2$</TEX> at high magnetic fields. In this study, glycerin <TEX>$(C_3H_8O_3)$</TEX> was selected as a chemical carbon source for the improvement of critical current density of <TEX>$MgB_2$</TEX>. In order to replace some of boron atoms by carbon atoms, the boron powder was heat-treated with liquid glycerin. The glycerin-treated boron powder was mixed with an appropriate amount of magnesium powder to <TEX>$MgB_2$</TEX> composition and the powder pallets were heat treated at <TEX>$650^{\circ}C\;and\;900^{\circ}C$</TEX> for 30 min in a flowing argon gas. It was found that the superconducting transition temperature <TEX>$(T_c)$</TEX> of <TEX>$Mg(B_{1-x}C_x)_2$</TEX> prepared using glycerin-treated boron powder was 36.6 K, which is slightly smaller than <TEX>$T_c$</TEX>(37.1 K) of undoped <TEX>$MgB_2$</TEX>. The critical current density <TEX>$(J_c)$</TEX> of <TEX>$Mg(B_{1-x}C_x)_2$</TEX> was higher than that of undoped <TEX>$MgB_2$</TEX> and the <TEX>$T_c$</TEX> improvement effect was more remarkable at higher magnetic fields. The <TEX>$T_c$</TEX>, decrease and <TEX>$J_c$</TEX> increase associated with the glycerin treatment for boron powder was explained in terms of the carbon substitution to boron site.
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