Niobium-titanium
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Niobium-titanium (NbTi) is an alloy of niobium and titanium, used industrially as a type II superconductor wire for superconducting magnets.
It can not withstand as high magnetic field intensity as the more expensive niobium-tin, but for most applications it is sufficient.
Its critical temperature is 10 kelvin and can remain superconductive until about 15 teslas.