论文部分内容阅读
The crystal structure and the superconductivity for samples Mg(B 1-x C x) 2 (0 ≤ x ≤ 0.09) prepared by a hybrid microwave synthesis have been investigated.The starting material B 10 C is also obtained by using the microwave method.The carbon can distribute uniformly in the Mg(B 1-x C x) 2 samples because boron and carbon are mixed on an atomic scale in the staring material B 10 C.The dependences of both lattice parameters and superconducting transition temperature T c on carbon content accord with those reported in the literature.The upper critical field H c2 at 20 K can be enhanced from about 4.3 T for x=0 to 10 T for x=0.05.The critical current density J c of Mg(B 0.95 C 0.05) 2 is 1.05 × 10 4 A/cm 2 at 20 K and 1 T.
The crystal structure and the superconductivity for samples Mg (B 1-x C x) 2 (0 ≦ x ≦ 0.09) prepared by a hybrid microwave synthesis have been investigated. The starting material B 10 C is also obtained by using the microwave method. The carbon can distribute uniformly in the Mg (B 1-x C x) 2 samples because boron and carbon are mixed on an atomic scale in the staring material B 10 C. The dependences of both lattice parameters and superconducting transition temperature T c on carbon content accord with those reported in the literature. Upper critical field H c2 at 20 K can be enhanced from about 4.3 T for x = 0 to 10 T for x = 0.05. The critical current density J c of Mg (B 0.95 C 0.05 ) 2 is 1.05 × 10 4 A / cm 2 at 20 K and 1 T.