The effect of the properties of starting Boron powders on the superconducting properties of MgB2 has been studied. The 92% and 96% powders demonstrate lower surface reactivity and larger particle size than the 99% Boron powder as can be seen from BET and SEM results, indicating that the low purity powders cannot be used to archive the same superconducting properties as those of samples made from pure 99% B powder.However, the purity of 92% and 96% Boron powders can be improved by using a simple chemical process, leading to enhanced magnetic critical current densities Jc. From XRD measurement, oxide impurity has been observed, which might be originated from the B 2 O 3 phase in the Boron powders. In order to get high performance MgB2, it is obviously important to control the phase composition and microstructure of amorphous boron starting powders and solid reaction conditions. 2
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