Higher borides and oxygen-enriched Mg-B-O inclusions as possible pinning centers in nanostructural magnesium diboride and the influence of additives on their formation

TL;DR

This paper investigates how higher borides and oxygen-enriched Mg-B-O inclusions act as pinning centers in nanostructural MgB2 superconductors, and how additives like Ti or SiC influence their formation and properties.

Contribution

It reveals the role of higher borides and Mg-B-O inclusions as pinning centers and how additives and temperature affect their formation in MgB2.

Findings

Higher borides and Mg-B-O inclusions serve as pinning centers.

Additives like Ti and SiC influence inclusion size and distribution.

Manufacturing temperature affects critical current density.

Abstract

The study of high pressure (2 GPa) synthesized MgB2-based materials allows us to conclude that higher borides (with near MgB12 stoichiometry) and oxygen-enriched Mg-B-O inclusions can be pinning centers in nanostructural magnesium diboride matrix (with average grain sizes of 15-37 nm). It has been established that additions of Ti or SiC as well as manufacturing temperature can affect the size, amount and distribution of these inclusions in the material structure and thus, influence critical current density. The superconducting behavior of materials with near MgB12 stoichiometry of matrix is discussed.