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The study on the critical temperature, composition, and microstresses in a Nb3Sn layer

✍ Scribed by N Kozlenkova; A Shikov; V Pantsyrnyi; A Vorobieva

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
200 KB
Volume
42
Category
Article
ISSN
0011-2275

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✦ Synopsis

Monofilamentary Nb 3 Sn wires of large diameter with niobium tube, which were obtained by the method of solid-phase diffusion, are well suited for the study of the distribution of the critical temperature T c in Nb 3 Sn layers. Three regions with different gradients of Sn and Nb concentration and different Cu content can be distinguished in Nb 3 Sn layer. In the central part of the layer, the Sn content comprises 24.5 at.% and the gradient of Sn concentration is negligibly small. Measurements on specimens of 1.2 mm in diameter with a slit cut along the cylinder generatrix showed that the critical temperature of the Nb 3 Sn region adjacent to Cu(Sn) bronze is lower than the critical temperature of the central part of the layer. Fluctuations of T c in the central part of the layer exceed the change of T c related to the gradient of the Sn concentration, which is very small. These fluctuations spread both the RðT Þ curve and the high-temperature part of the temperature transition registered by the inductive method.

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