超伝導金属間化合物Nb₃Al及びNb₃(Al-Ge) の生成

抄録

Supercondcting intermetallic compounds, Nb₃Al and Nb₃(Al-Ge) were prepared by three methods: diffusion after dipping, diffusion after vacuum deposition and co-deposition. It is found that the intermetalic compounds can be formed at temperarures between 800°C and 1, 000°C by the co-deposition method. Intermetalic compohnds formed were identified using X-ray diffraction analysis, observation of anodically oxidized specimens and meaurement of the superconducting transition temperature.
The critical current densities, J_c were measured for Nb₃(Al-Ge) specimens prepared by codeposition method with a result J_c-10⁴A/cm2 at 30KG. Refering to the literatures on Nb₃Al, Nb₃(Al-Ge), Nb₃Sn, V₃Si and V₃Ga inter relations between the method of synthesis, the formation temperature and the superconducting properties were examined to find the way to raise the critical current density of Nb₃Al and Nb₃(Al-Ge).