Extension of the APC approach to Nb/sub 3/Sn requires that a second phase be introduced into the Nb/sub 3/Sn reaction layer with the intent of increasing the volume pinning strength. This can be achieved by either the refinement of the Nb/sub 3/Sn grains due to the presence of a second phase or by the second phase itself pinning flux. If a bronze-type process is to be used a different addition than Zr is required since internal oxidation of Nb is not possible. The criteria for elements to be candidates for the APC approach are discussed. The results for one of the candidates (Ag) show that it is not incorporated into the Nb/sub 3/Sn, however, its addition did increase the growth rate.
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机译：将APC方法扩展到Nb / sub 3 / Sn需要将第二相引入Nb / sub 3 / Sn反应层中，以提高体积固定强度。这可以通过由于存在第二相而细化Nb / sub 3 / Sn晶粒来实现，也可以通过第二相自身钉扎通量来实现。如果要使用青铜型工艺，则需要添加不同于Zr的添加物，因为Nb的内部氧化是不可能的。讨论了要成为APC方法候选元素的标准。其中一种候选物（Ag）的结果表明，它没有掺入Nb / sub 3 / Sn中，但是，添加确实增加了增长率。
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