Rapid preparation of Mg(B1-xCx)2 superconductor using hybrid microwave method
Rapid preparation of Mg（B1-xCx）2 superconductor using hybrid microwave method

The crystal structure and the superconductivity for samples Mg(B1-xCx)2 (0 \le x \le 0.09) prepared by a hybrid microwave synthesis have been investigated. The starting material B10C is also obtained by using the microwave method. The carbon can distribute uniformly in the Mg(B1-xCx)2 samples because boron and carbon are mixed on an atomic scale in the staring material B10C. The dependences of both lattice parameters and superconducting transition temperature Tc on carbon content accord with those reported in the literature. The upper critical field Hc2 at 20K can be enhanced from about 4.3T for x=0 to 10\,T for x=0.05. The critical current density Jc of Mg(B0.95C0.05)2 is 1.05×104A/cm2 at 20K and 1T.