Niobium-tin

Niobium-tin (Nb₃Sn) or triniobium-tin is a metallic chemical compound of niobium (Nb) and tin (Sn), used industrially as a type II superconductor. This intermetallic compound is a A15 phases superconductor. It is more expensive than niobium-titanium (NbTi), but can withstand magnetic field intensity values up to 30 teslas (T), whereas NbTi can withstand only up to roughly 15 T.

Nb₃Sn was discovered to be a superconductor in 1954.

Its critical temperature is 18.3 kelvin (K). It is usually used at 4.2 K, the boiling point of liquid helium.

In April 2008 a record non-copper current density was claimed of 2643 A/mm² at 12 T and 4.2 K