The layer growth and superconducting properties of Nb/sub 3/Sn are investigated as a function of the heat treatment (HT) duration and temperature for internal tin and powder-in-tube strands at 650 /spl deg/C, 700 /spl deg/C and 750 /spl deg/C. For all times and temperatures, the Nb/sub 3/Sn layer thickness is measured, the critical current at 4.2 K is tested as a function of magnetic field, and the upper critical field is obtained through parameterization. Results of the layer critical current density are also shown as a function of HT duration and temperature.
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Barzi et al. (2003) studied this question.
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