Ion implantation and spin quenching of superconducting materials. Technical progress report

The work reported has focused on completing experiments on heavy dose implantations into substrates with an A-15 structure and on initiating experiments on melt spinning for forming new A-15 compounds and amorphous ribbons. The effect of ion implantation on metastable phase formation and superconducting transition temperature has been investigated. The particular alloys studied were Nb3Al/sub 1-x/B/sub x/ and Nb3Al/sub 1-x/C/sub x/. A-15 Nb3Al was used as the substrate material, and large doses of B and C (up to 23 at. %) were implanted into Al depleted surfaces. Melt spinning was used to rapidly quench V2CrAl/sub 1-x/B/sub x/ and Ti3Nb6Mo3Si4 alloys. Melt spinning had very little effect on the crystal structure of the V2CrAl/sub 1-x/B/sub x/ alloys, but a new A-15 phase was found by rapid quenching of the Ti3Nb6Mo3Si4 alloys