Microwave Synthesis of Nano SiC Doping Mg(B1-2x(SiC)x)2 Superconductor and Superconductivity
Superconductor samples Mg(B1-2x(SiC)x)2 (x=0,5%,10%) are synthesized from nano SiC,Mg and amorphous boron powders by microwave direct synthesis in a short time.Powder X-ray diffraction (XRD) analysis indicates that the phases of the synthesis sample are MgB2 (major phase) and a small amount of MgO and Mg2Si.The main peaks of MgB2,(100),(101),(002) and (110) are shift to the higher diffraction angle position and the width of half height of the diffraction plane is broaden for the SiC doping Mg(B1-2x(SiC)x)2,which show that the B positions of MgB2 are partly substituted and the grains of MgB2 are fine.Scanning electron microscope (SEM) observation shows that the MgB2 grain size is very small and the sample is tightness (compact).The onset superconducting transition temperature of the Mg(B1-2x(SiC)x)2 (x=0,5%,10%) samples measured by magnetization measurement are about 37.6 K,37.0 K,36.8 K respectively.The critical current density Jc are calculated according to the Bean model from the magnetization hysteresis loop of the slab Mg(B1-2x(SiC)x)2 (x=0,5%,10%) samples.The critical current density Jc of nano SiC doping Mg(B1-2x(SiC)x)2 samples are greatly enhanced.In higher external magnetic field,the Jc of 10% SiC doped sample is the highest; in lower external magnetic field,the Jc of 5% SiC doped sample is the highest; while in the whole external magnetic field,the Jc of undoped sample is the lowest.
Microwave Synthesis Nano SiC MgB2 Superconductor Superconductivity
Yuandong Peng Qinglin Xia Qian-Ming Huang Liya Li Hongzhong Wang Rui Bao Jianhong Yi
State Key Laboratory for Powder Metallurgy and School of Physics and Electronics,Central South Unive State Key Laboratory for Powder Metallurgy and School of Physics and Electronics,Central South Unive
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
11-16
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）