Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Superconducting Properties of a $MgB_2$ Bulk Formed by Using a $MgB_4$ + Mg Mixture

Tan, Kai Sin;Jun, Byung-Hyuk;Kim, Chan-Joong

  • Published : 20090400
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Abstract

The superconducting properties of a $MgB_2$ bulk formed by using a $MgB_4$ + Mg mixture were studied. $MgB_4$ powder was synthesized at 1000 $^{\circ}C$ for 5 hours in owing Ar gas. The density of the $MgB_2$ bulk formed by using this method was higher than that of the conventional $MgB_2$ bulk formed by using a Mg + 2B mixture. However, lower $J_c$ values were observed, especially at low fields, due to the high amount of MgO and $MgB_4$ present, thus decreasing the effective cross-sectional area and the connectivity of the samples. Although an enhancement of $H_{c2}$(T) was observed, the result showed no significant improvement in the $H_{irr}$(T).

Keywords

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