Abstract
We have investigated crystal growth and critical current densities of MgB/sub 2/ which was synthesized using stoichiometry or excess Mg and two kinds of B grain size. Excess Mg plays a role not only to promote crystal growth but also to make crystal grains fine. During crystal growth, the critical current densities decrease, although the density remains constant, approximately. Irrespective of the starting B powder, J/sub CM/ is the highest in the sample with the smallest crystal grains and highest density of MgB/sub 2/. The effects of excess Mg creates the possibility to control crystal size of MgB/sub 2/ by adjusting the quantity of Mg.
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