Abstract
Superconducting MgB 2 bulk samples were simply sintered by heating stoichiometric mixture of Mg and B in vacuum. In situ resistance measurements were performed carefully in order to find the best annealing process. The in situ resistance measurements exhibit a decrease in resistance when the heating temperature is increased. The measurements suggested that the Mg powder melting temperature was below 650 °C and the temperature of 800 °C was higher than required. A MgB 2 bulk sample sintered at 750 °C has a superconducting transition temperature of T c (R=0)=40.3 K, higher than that sintered at 680 or 810 °C.
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