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Advances in Molten Salts

ISSN:
1-56700-142-4 (Print)

Currentless Deposition of Nb3Sn in Molten Salts

V. Kolosov
I. Tananaev Institute of Chemistry, Kola Science Centre RAS, 184200, Apatity, Russia

V. Novichkov
I. Tananaev Institute of Chemistry, Kola Science Centre RAS, 184200, Apatity, Russia

E. Matychenko
I. Tananaev Institute of Chemistry, Kola Science Centre RAS, 184200, Apatity, Russia

A. Shevyryov
I. Tananaev Institute of Chemistry, Kola Science Centre RAS, 184200, Apatity, Russia

Abstract

The production possibility of superconducting Nb3Sn-coatings by currentless method in molten salts is investigated. In this connection interaction between niobium and KCl-NaCl (1:1 mol.)-SnCl2 or (Cs-K-Na)Cl (eutectic.)-SnCl2 melts and cathodic electroreduction of tin on niobium electrode at temperature 530-800°C are studied. According to the X-ray diffraction data, in the process of currentless holding of the niobium sample in tin-containing melts, multiphase coatings containing Nb3Sn are formed as a rule. This corresponds to the data of currentless chronopotentiometry. The coatings obtained were found to be superconducting with maximum critical temperature Tc = 17,0 ÷ 17,8 K and critical current density jc = 2 ÷ 3 × lO6 A/cm2 in a transversal magnetic field B = 4 T.