Abstract
The effect of interstitial impurities and elements of Groups IVA, VA, and VIA (Zr, Ti, Hf, V, Ta, Cr, W, Mo) on the superconducting properties of niobium is considered. The chief interstitial impurity reducing the value of TK is oxygen. It is concluded that IK and \( {H_{{C_2}}} \) increase with oxygen content. The TK of niobium changes on alloying with elements of Groups NA, VA, and VIA. There is a considerable rise in the critical current density of Nb—alloys after introducing oxygen and subjecting to heat treatment; this is attributed to the more effective precipitation of a new phase from the solid solution in the presence of oxygen.
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