Abstract
We have investigated the phase evolution and microstructure of carbon doped MgB 2 by using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscope (SEM). The analysis of DSC and XRD indicate that both the reaction temperature between Mg and B and the MgB 2 phase stability increase for the carbon doped samples. The reaction rate between Mg and B decreases with the carbon content increase in the Mg–B system. SEM observation has shown that the carbon doping degenerates the grain connectivity of MgB 2. In order to improve denseness of MgB 2 sample, the two-step reaction method is proposed.
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