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Magnetization and Susceptibility Measurements of Polycrystalline Niobium

Magnetization and susceptibility data are presented for niobium rod samples in the temperature range of 1.2°–8.9°K. The niobium samples tested had a range of tantalum content from 700 to 4000 ppm. The samples were annealed and degassed in high vacuum at temperatures between 2100° and 2300°C. Values of κ1, κ2, Hc1, Hc2, and Hc are presented as a function of tantalum impurity, and these values are compared with theoretical predictions.