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Superconducting niobium carbonitride wires Nb(C y N x ) has been prepared by a diffusion process in two steps, first diffusing carbon from methane into niobium wires and then nitrogen into these carbonized samples. The optimum conditions for these preparations have been investigated in detail. All samples have been analysed quantitatively for C, N and Nb. The carbonizing as well as the following nitriding of the wires has been investigated under various conditions. The maximum of the transition temperature of the Nb(C y N x ) wires prepared by this two steps diffusion process is reached for the same composition y, x as for sintered samples. But the value is about 0.4 K lower.

Preparation and Superconducting Properties of Niobium Carbonitride Wires