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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, normally as Nb-Ti fibres in an aluminium or copper matrix. Its critical temperature is 10 kelvin〔.〕 In 1962, at Atomics International, T.G. Berlincourt and R.R.Hake.〔T.G. Berlincourt and R.R. Hake, “Pulsed-Magnetic-Field Studies of Superconducting Transition Metal Alloys at High and Low Current Densities,” Bull. Am. Phys. Soc. II 7 408 (1962) and T.G. Berlincourt, “Emergence of Nb-Ti as Supermagnet Material,” Cryogenics 27, 283 (1987)〕 discovered the superior high-critical-magnetic-field, high-critical-supercurrent-density properties of Nb-Ti that, together with affordability and easy workability, distinguish Nb-Ti alloys from thousands of other superconductors and justify their status as the most-widely-utilized (workhorse) superconductors. With a maximum critical magnetic field of about 15 tesla, Nb-Ti alloys are suitable for fabricating supermagnets generating magnetic fields up to about 10 tesla. For higher magnetic fields, higher-performance, but more-expensive and less-easily fabricated superconductors, such as niobium-tin, are commonly employed. The part of global economic activity, for which superconductivity is indispensable, amounted to about five billion euros in 2014. 〔http://www.conectus.org/xxmarket.html〕 MRI systems, most of which employ niobium-titanium, accounted for about 80% of that total. == Notable uses == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Niobium-titanium」の詳細全文を読む スポンサード リンク
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