Microwave Synthesis of Nano SiC Doping Mg(B_1-2x(SiC)_x)₂ Superconductor and Superconductivity

Abstract:

Superconductor samples Mg(B_1-2x(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(B_1-2x(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(B_1-2x(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 J_c are calculated according to the Bean model from the magnetization hysteresis loop of the slab Mg(B_1-2x(SiC)_x)₂ (x=0, 5%, 10%) samples. The critical current density Jc of nano SiC doping Mg(B_1-2x(SiC)_x)₂ samples are greatly enhanced. In higher external magnetic field, the J_c 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 J_c of undoped sample is the lowest.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 11-16
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.11
• Online since: June 2012
• Authors: Yuan Dong Peng, Qing Lin Xia, Qian Ming Huang, Li Ya Li, Hong Zhong Wang, Rui Bao, Jian Hong Yi
• Keywords: MgB₂, Microwave Synthesis, Nano-SiC, Superconductivity, Superconductor

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