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High critical currents in cold‐powder‐metallurgy‐processed superconducting Cu‐Nb‐Sn composites
1.R. Flükiger, S. Foner, E. J. McNiff, Jr., B. B. Schwartz, J. Adams, S. Forman, T. W. Eagar, and R. M. Rose, IEEE Trans. Magn. MAG‐15, 689 (1979).
2.L. Schultz, H. C. Freyhardt, R. Bormann, and B. L. Mordike, Proc. LT 14 (Otanienn, 1975), Vol. 2, p. 59.
3.R. Bormann, L. Schultz, and H. C. Freyhardt, Appl. Phys. Lett. 32, 79 (1978).
4.L. Schultz, R. Bormann, and H. C. Freyhardt, IEEE Trans. Magn. MAG‐15, 94 (1979).
5.S. Foner, E. J. McNiff, Jr., B. B. Schwartz, R. Roberge, and J. L. Fihey, Appl. Phys. Lett. 31, 353 (1978).
6.R. Roberge, S. Foner, E. J. McNiff, Jr., B. B. Schwartz, and J. L. Fihey, Appl. Phys. Lett. 34, 111 (1979). The comparisons between the in situ and the best published commercial multifilamentary are discussed in this reference.
7.Several tests with different starting materials were made. The present work used Cu powders from Consolidated Astronautics, Inc. Hauppauge, N.Y., and Nb powders produced by the hydride‐hydride technique from Teledyne Wah Chang, Albany, Ore.
8.W. de Sorbo, Phys. Rev. 132, 107 (1963) reported extensive measurements of ‐vs‐ concentration and showed that decreased by 0.93 K per at.% oxygen. The purest Nb had a If the decrease in of Fig. 2 is due to oxygen only, the hot‐pressed Nb would correspond to about 2 at.% oxygen content.
9.E. Gebhart and R. Rothenbacher, Z. Metallkd. 54, 443 (1963), discuss microhardness versus oxygen content. Their measurements are consistent with about 2.5 at.% oxygen for the lowest‐ material.
10.Compositions in Fig. 4 are given in wt.% with respect to Cu as in Ref 6. This is convenient because we often use a fixed Cu‐wt.% Nb with various Sn additions. The wt.% Nb clearly indicates the same batch whereas this would not be transparent for other notations. Thus, Cu‐40 wt.% Nb‐20 wt.% Sn and Cu‐50 wt.% Nb‐10 wt.% Sn are wt.% with respect to Cu and correspond to at.% and respectively, and correspond to wt.% of total alloy of 53 wt.% Cu‐36 wt.% Nb‐11 wt.% Sn and 47.5 wt.% Cu‐47.5 wt.% Nb‐5 wt.% Sn, respectively.
11.S. Foner, R. Roberge, E. J. McNiff, Jr., B. B. Schwartz, and J.‐L. Fihey, Appl. Phys. Lett. 34, 231 (1979).
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