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Superconductor

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

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Quantitative Metallography With a Digital Computer: Application to a Nb-Sn Superconducting Wire.

G A Moore, L L Wyman

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry

|October 4, 2019

Summary

This summary is machine-generated.

Computer analysis of photomicrographs provides accurate microstructural data for solid materials. For Nb-Sn superconductor wire, this revealed interconnected Nb3Sn and identified small voids as the primary cause of a short superconducting mean free path.

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Area of Science:

Materials Science
Computer Science
Solid-State Physics

Background:

Traditional manual measurements for microstructural analysis of solid materials are often difficult and time-consuming.
Advancements in digital imaging and computer processing offer potential for more accurate and efficient quantitative data acquisition.
Understanding the microstructural properties of superconducting materials like Niobium-Tin (Nb3Sn) is crucial for their performance.

Purpose of the Study:

To demonstrate the capability of digital computer analysis of photomicrographs for obtaining accurate microstructural data.
To analyze the microstructure of a Niobium-Tin (Nb3Sn) superconductor wire specimen.
To identify factors limiting the superconducting properties, specifically the mean free path.

Main Methods:

Review of the history of picture interpretation experiments at the National Bureau of Standards.
Illustration of fundamental computer operations for image processing.
Application of 24 functional image processing routines to analyze a micrograph of Nb-Sn superconductor wire.

Main Results:

The Nb-Sn superconductor wire specimen contains approximately 70% Niobium-Tin (Nb3Sn), largely interconnected.
The mean free path in the Nb3Sn superconducting phase was measured to be a short 26.5 microns.
Small voids were identified as the most significant factor contributing to the short mean free path, followed by other solid phases.

Conclusions:

Digital computer analysis of photomicrographs is a viable method for accurate microstructural characterization of solid materials.
The microstructure of the analyzed Nb-Sn superconductor wire is characterized by interconnected Nb3Sn and numerous voids.
The observed short mean free path in Nb3Sn is primarily attributed to voids, likely formed during heat treatment reactions.