Theses and Dissertations

Date of Award

5-2020

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Physics

First Advisor

Dr. Karen S. Martirosyan

Second Advisor

Dr. Mircea Chipara

Third Advisor

Dr. Ahmed Touhami

Abstract

The discovery of superconductivity in a simple hexagonal binary compound of MgB2 at a relatively high critical temperature ~39 K renewed the interest in the field of superconductivity. Twisted laminar superconducting composite structures based on coiled multi-walled carbon nanotube (MWCNT) yarns were crafted by integrating magnesium and boron homogeneous mixture into the carbon nanotube sheets. After the ignition of the Mg/B/MWCNT system, under the controlled argon environment and uniform heating rate, the high exothermic reaction between magnesium (Mg) and boron (B) with stoichiometric ratio produced the MgB2/MWCNT superconducting composite yarns. The XRD analysis confirmed that the heated sample consists of a superconducting phase of MgB2. The tensile strength and Young’s modulus of the composite yarn at room temperature have been evaluated to be 200 MPa and 1.27 GPa respectively. The superconductive critical temperature of ~39 K was determined by measuring temperature-dependent magnetization curves. The critical current density was obtained at different temperatures by using hysteresis measurement. The highest value of Jc = 3.52 × 107 A/cm2 was recorded at 5 K.

Comments

Copyright 2020 Ujjal Lamichhane. All Rights Reserved.

https://go.openathens.net/redirector/utrgv.edu?url=https://www.proquest.com/dissertations-theses/magnesium-diboride-embedded-multi-walled-carbon/docview/2423836166/se-2?accountid=7119

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