Fabrication of PbO-type structure β-FeSe superconductor ceramics by solid state reaction method
PbO-type structure β-FeSe superconductor ceramic were successfully prepared by solid state sinter method in high vacuum state.The structures of the ceramics were investigated by X-ray diffraction and scanning electron microscopy.X-ray diffraction indicates that the sample prepared by two-steps method exhibited a much improved crystallinity.And as sintering temperature increases to 700℃,secondary phase Fe7Se8 phase peak disappear and α-Fe peak weakened.Besides,the ceramic prepared in 700℃ exhibited a denser surface morphology in comparison to that prepared in 410℃ and its composition is closer to the chemical formula FeSe according to EDX compositional analyses.It was noted that the resistivity of the sample,sintered at 700 ℃ using two-steps sinter method,shows a linear metallic behavior from room temperature and onset is around T =7.5 K.
Superconductor Ceramic solid state reaction Resistivity
Wu Yunyi Gao Jian Li Tao Hua Zhiqiang
Beijing General Research Institute for Nonferrous Metals,Beijing 100088,China
国际会议
西安
英文
493-496
2013-07-27（万方平台首次上网日期，不代表论文的发表时间）