Preparation of High-Field Nb_3(Al, Ge) and Nb_3Al Superconductors by Liquid Quenching and High-Energy Beam Techniques (Low-T_c Superconducting Materials Research)
Nb_3Al and its ternary compounds tapes have been prepared by continuous liquid quenching and high energy beam irradiation and Jc of the tapes has been measured in fields up to 23T. The Nb_3Al, Nb_3(Al, Ge) and Nb_3(Al, Si) alloy tapes prepared by the continuous liquid quenching have an extremely small grain size which is enough to ensure a strong flux pinning and hence high critical current density. Jc at 4.2K reaches 10^5A/cm^2 at 20T. Continuous high energy beam irradiation has been performed for Nb-Al and Nb-(Al-Ge) tapes made by powder metallurgy process. High Tc and excellent high field Jc properties have been achieved by the irradiation and subsequent annealing. Overall Jc\u27s exceeding well 10^4A/cm^2 have been obtained at 23T and 4.2K for the Nb-Al and Nb-(Al-Ge) tapes
