Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor

A co-precipitation (COP) process for the synthesis of ultrafine YBa2Cu3O7-δ (Y-123) precursor has been developed with the addition of carbon nanofibers (CNFs) and carbon nanotubes (CNTs) nanoparticles with varying amounts of weight percentage (wt. %). Both nanoparticles acted as pinning center to im...

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Main Author:	Khalid, Nurul Auni
Format:	Thesis
Language:	English
Published:	2016
Subjects:	Superconductivity Superconductors
Online Access:	http://psasir.upm.edu.my/id/eprint/67575/1/FS%202017%2086%20IR.pdf
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spelling	my-upm-ir.675752019-03-12T01:31:08Z Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor 2016-11 Khalid, Nurul Auni A co-precipitation (COP) process for the synthesis of ultrafine YBa2Cu3O7-δ (Y-123) precursor has been developed with the addition of carbon nanofibers (CNFs) and carbon nanotubes (CNTs) nanoparticles with varying amounts of weight percentage (wt. %). Both nanoparticles acted as pinning center to improve the transport critical current density (Jc). The objective of this study was to investigate the flux pinning capability from carbon sources of CNFs and CNTs in YBa2Cu3O7-δ superconductor. The effects of CNFs and CNTs addition on the superconducting properties (Tc and Jc), phase formation and structural properties, microstructure and surface morphology including the elemental distribution analysis were studied. A non-added Y-123 was used as a reference. The Jc for this sample is 11 A/cm2. Introduction of CNFs and CNTs improved Jc significantly. Furthermore, the volume fraction of Y-123 phase was 96.2 % and EDX showed excellent atomic ratio. CNFs addition significantly enhanced the Jc of Y-123 bulk. The x = 0.4 wt. % sample showed the optimal amount as it exhibited the highest Tc and Jc of 88.0 K and 830 A/cm2, respectively. CNTs addition showed Jc value of 477 A/cm2 for the x = 0.2 wt. % sample which gave the optimal amount of CNTs addition. The largest grain size and high percentage of Y-123 phase was also observed in this sample together with good atomic % from EDX and high Tc value. The enhancement of Jc using CNFs and CNTs as artificial pinning centers from this work indicated that these two compounds are suitable for flux trapping. Both samples show increased values of Tc and Jc towards the optimum wt. % of addition and decreased after further addition of dopants. Superconductivity Superconductors 2016-11 Thesis http://psasir.upm.edu.my/id/eprint/67575/ http://psasir.upm.edu.my/id/eprint/67575/1/FS%202017%2086%20IR.pdf text en public masters Universiti Putra Malaysia Superconductivity Superconductors
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Superconductivity Superconductors
spellingShingle	Superconductivity Superconductors Khalid, Nurul Auni Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor
description	A co-precipitation (COP) process for the synthesis of ultrafine YBa2Cu3O7-δ (Y-123) precursor has been developed with the addition of carbon nanofibers (CNFs) and carbon nanotubes (CNTs) nanoparticles with varying amounts of weight percentage (wt. %). Both nanoparticles acted as pinning center to improve the transport critical current density (Jc). The objective of this study was to investigate the flux pinning capability from carbon sources of CNFs and CNTs in YBa2Cu3O7-δ superconductor. The effects of CNFs and CNTs addition on the superconducting properties (Tc and Jc), phase formation and structural properties, microstructure and surface morphology including the elemental distribution analysis were studied. A non-added Y-123 was used as a reference. The Jc for this sample is 11 A/cm2. Introduction of CNFs and CNTs improved Jc significantly. Furthermore, the volume fraction of Y-123 phase was 96.2 % and EDX showed excellent atomic ratio. CNFs addition significantly enhanced the Jc of Y-123 bulk. The x = 0.4 wt. % sample showed the optimal amount as it exhibited the highest Tc and Jc of 88.0 K and 830 A/cm2, respectively. CNTs addition showed Jc value of 477 A/cm2 for the x = 0.2 wt. % sample which gave the optimal amount of CNTs addition. The largest grain size and high percentage of Y-123 phase was also observed in this sample together with good atomic % from EDX and high Tc value. The enhancement of Jc using CNFs and CNTs as artificial pinning centers from this work indicated that these two compounds are suitable for flux trapping. Both samples show increased values of Tc and Jc towards the optimum wt. % of addition and decreased after further addition of dopants.
format	Thesis
qualification_level	Master's degree
author	Khalid, Nurul Auni
author_facet	Khalid, Nurul Auni
author_sort	Khalid, Nurul Auni
title	Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor
title_short	Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor
title_full	Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor
title_fullStr	Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor
title_full_unstemmed	Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor
title_sort	physical and superconducting properties of carbon nanofibers and carbon nanotubes yba₂cu₃o₇₋δ superconductor
granting_institution	Universiti Putra Malaysia
publishDate	2016
url	http://psasir.upm.edu.my/id/eprint/67575/1/FS%202017%2086%20IR.pdf
_version_	1747812482839216128

Physical and superconducting properties of carbon nanofibers and carbon nanotubes YBa₂Cu₃O₇₋δ superconductor

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