A Review of the Properties of Nb3Sn and Their Variation with A15 Composition, Morphology and Strain State

TL;DR

This review consolidates over 50 years of research on Nb3Sn, detailing how its properties vary with composition, morphology, and strain, providing a comprehensive overview of its fundamental and applied characteristics.

Contribution

It offers the first specific review focused solely on Nb3Sn, summarizing diverse studies on its properties and effects of various modifications in a single comprehensive resource.

Findings

Sn content influences electron-phonon interaction and phase boundary

Additions of Cu, Ti, Ta affect material properties

Grain size and strain significantly impact Nb3Sn performance

Abstract

This article gives an overview of the available literature on simplified, well defined (quasi-)homogeneous laboratory samples. After more than 50 years of research on superconductivity in Nb3Sn, a significant amount of results are available, but these are scattered over a multitude of publications. Two reviews exist on the basic properties of A15 materials in general, but no specific review for Nb3Sn is available. This article is intended to provide such an overview. It starts with a basic description of the Niobium-Tin intermetallic. After this it maps the influence of Sn content on the the electron-phonon interaction strength and on the field-temperature phase boundary. The literature on the influence of Cu, Ti and Ta additions will then be briefly summarized. This is followed by a review on the effects of grain size and strain. The article is concluded with a summary of the main results.