Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah

Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah

The effects of the elemental substitution on the 1212 phase formation and superconducting properties of (Tl,Bi)(Sr,Ti)2Ca0.9Y0.1Cu2O7 and (Tl,Pb)(Sr,M)2CaCu2O7 (M = Yb, Sb) series have been investigated. The samples were prepared using high purity oxides by solid state and precursor method. Cryst...

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Main Author: Wan Abdullah, Wan Faizah
Format: Thesis
Language:English
Published: 2005
Subjects:
Superconducting materials. Superconductors
Online Access:http://ir.uitm.edu.my/id/eprint/3720/
http://ir.uitm.edu.my/id/eprint/3720/1/TM_WAN%20FAIZAH%20WAN%20ABDULLAH%20AS%2005_5%201.pdf
id uitm-3720
recordtype eprints
spelling uitm-37202016-09-22T03:32:44Z http://ir.uitm.edu.my/id/eprint/3720/ Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah Wan Abdullah, Wan Faizah Superconducting materials. Superconductors The effects of the elemental substitution on the 1212 phase formation and superconducting properties of (Tl,Bi)(Sr,Ti)2Ca0.9Y0.1Cu2O7 and (Tl,Pb)(Sr,M)2CaCu2O7 (M = Yb, Sb) series have been investigated. The samples were prepared using high purity oxides by solid state and precursor method. Crystal structures of the samples were analyzed using X-ray powder diffraction method while microstructures were investigated by scanning electron microscope (SEM). Measurements of electrical resistance were carried out using standard four-pointprobe method. Powder X-ray diffraction patterns for Tl0.9Bi0.1Sr2-yTiyCa0.9Y0.1Cu2O7 (y = 0 – 0.5) with Bi, Ti and Y triple substitution revealed that all the samples consist mostly of major 1212 and minor 1201 crystalline phases. Temperature dependent resistance measurements on Tl1-xBixSr1.9Ti0.1Ca0.9Y0.1Cu2O7 (x = 0 – 0.6) showed optimum superconductivity for x = 0.3 with Tc onset of 93.3 K and Tc zero of 68.2 K Temperature dependent electrical resistance measurements on Tl1-mPbmSr1.8Yb0.2CaCu2O7 (m = 0.1– 0.5) showed metallic normal state behaviors and increase in Tc zero from 61.1 K at m = 0.1 to a maximum value of 101.1 K at m = 0.5. Substitutions of Yb at Sr-site of Tl0.5Pb0.5Sr2-nYbnCaCu2O7 with n = 0 – 0.6 increased value of in Tc zero from 62.2 K at n = 0 to a maximum value of 101.1 K at n = 0.2. Substitution of Pb at Tl-site and Sb at Sr-site in Tl1-qPbqSr1.8Sb0.2CaCu2O7 (q = 0.1 – 0.6) promote 1212 phase formation and increased in Tc zero from 26.1 K at q = 0.1 to 80.2 K at q = 0.5. From this study, it is found that apart from the Tl and Ca sites, Sr-site substitution is also effective in optimizing critical temperature, Tc and critical current density, Jc of Tl1212 samples. The results were discussed in terms of the concept of average copper valence and ionic radius of elements. i 2005 Thesis NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/3720/1/TM_WAN%20FAIZAH%20WAN%20ABDULLAH%20AS%2005_5%201.pdf Wan Abdullah, Wan Faizah (2005) Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah. Masters thesis, Universiti Teknologi MARA.
repository_type Digital Repository
institution_category Local University
institution Universiti Teknologi MARA
building UiTM Institutional Repository
collection Online Access
language English
topic Superconducting materials. Superconductors
spellingShingle Superconducting materials. Superconductors
Wan Abdullah, Wan Faizah
Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah
description The effects of the elemental substitution on the 1212 phase formation and superconducting properties of (Tl,Bi)(Sr,Ti)2Ca0.9Y0.1Cu2O7 and (Tl,Pb)(Sr,M)2CaCu2O7 (M = Yb, Sb) series have been investigated. The samples were prepared using high purity oxides by solid state and precursor method. Crystal structures of the samples were analyzed using X-ray powder diffraction method while microstructures were investigated by scanning electron microscope (SEM). Measurements of electrical resistance were carried out using standard four-pointprobe method. Powder X-ray diffraction patterns for Tl0.9Bi0.1Sr2-yTiyCa0.9Y0.1Cu2O7 (y = 0 – 0.5) with Bi, Ti and Y triple substitution revealed that all the samples consist mostly of major 1212 and minor 1201 crystalline phases. Temperature dependent resistance measurements on Tl1-xBixSr1.9Ti0.1Ca0.9Y0.1Cu2O7 (x = 0 – 0.6) showed optimum superconductivity for x = 0.3 with Tc onset of 93.3 K and Tc zero of 68.2 K Temperature dependent electrical resistance measurements on Tl1-mPbmSr1.8Yb0.2CaCu2O7 (m = 0.1– 0.5) showed metallic normal state behaviors and increase in Tc zero from 61.1 K at m = 0.1 to a maximum value of 101.1 K at m = 0.5. Substitutions of Yb at Sr-site of Tl0.5Pb0.5Sr2-nYbnCaCu2O7 with n = 0 – 0.6 increased value of in Tc zero from 62.2 K at n = 0 to a maximum value of 101.1 K at n = 0.2. Substitution of Pb at Tl-site and Sb at Sr-site in Tl1-qPbqSr1.8Sb0.2CaCu2O7 (q = 0.1 – 0.6) promote 1212 phase formation and increased in Tc zero from 26.1 K at q = 0.1 to 80.2 K at q = 0.5. From this study, it is found that apart from the Tl and Ca sites, Sr-site substitution is also effective in optimizing critical temperature, Tc and critical current density, Jc of Tl1212 samples. The results were discussed in terms of the concept of average copper valence and ionic radius of elements. i
format Thesis
author Wan Abdullah, Wan Faizah
author_facet Wan Abdullah, Wan Faizah
author_sort Wan Abdullah, Wan Faizah
title Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah
title_short Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah
title_full Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah
title_fullStr Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah
title_full_unstemmed Superconductivity in Ti, Sb, Yb, Bi, Pb and Y multiply substituted TI1212 system / Wan Faizah Wan Abdullah
title_sort superconductivity in ti, sb, yb, bi, pb and y multiply substituted ti1212 system / wan faizah wan abdullah
publishDate 2005
url http://ir.uitm.edu.my/id/eprint/3720/
http://ir.uitm.edu.my/id/eprint/3720/1/TM_WAN%20FAIZAH%20WAN%20ABDULLAH%20AS%2005_5%201.pdf
first_indexed 2023-09-18T22:46:46Z
last_indexed 2023-09-18T22:46:46Z
_version_ 1777417277383114752

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