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Superconducting bulk MgB 2 samples have been synthesized by employing sintering technique without using any additional process steps, generally undertaken in view of the substantial loss of magnesium, during heat treatment. Starting with Mg rich powders having different atomic ratios of Mg : B, as against the nominally required Mg : B = 1 : 2 ratio, we have obtained superconducting MgB 2 samples of different characteristics. The effect of excess Mg in the starting mixture and processingdoi:10.1007/bf02706486 fatcat:445wn2p7sfbnbg332lqigscrc4