Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad

The study involves four different compounds ofT1Sr1212 superconductors. There are T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.6), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), T10.5Pb0.5Sr2-xMgx Ca0.8Yb0.2Cu2O7-δ (x=0-1.0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x = 0.1-0.4) series. All the samples were synthesized usin...

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Main Author:	Ahmad, Nurulhuda
Format:	Thesis
Language:	English
Published:	2010
Subjects:	Ceramic technology Pottery
Online Access:	https://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf
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spelling	my-uitm-ir.273052022-06-14T02:16:17Z Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad 2010 Ahmad, Nurulhuda Ceramic technology. Pottery The study involves four different compounds ofT1Sr1212 superconductors. There are T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.6), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), T10.5Pb0.5Sr2-xMgx Ca0.8Yb0.2Cu2O7-δ (x=0-1.0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x = 0.1-0.4) series. All the samples were synthesized using the solid state synthesis method. Temperature dependent electrical resistance measurements on T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x = 0.006) series showed the best superconducting behavior at x=O.4 with zero resistance critical temperature (TC zero) of 77.6 K. On the other hand, electrical resistance measurements on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) series showed gradual decrease in TC zero followed by a sudden increase in TC at x = 0.3. Further substitution of Cu at x≥0.4 however caused TC to be suppressed. Electrical resistance measurement in T10.5Pb0.5Sr2-xMgxCa0.8Yb 0.2Cu2O7-δ (x=0-1.0) showed increasing semiconductor-like normal state behavior and gradual suppression of Tc with Mg. In addition, superconducting fluctuation behavior (SFB) in T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.4), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3), T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x= 0.1-0.4) ceramics were analyzed by using Asmalazov-Larkin (AL) theory as a framework. In T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0-0.4), the analysis showed characteristic cross-over from 2D to 3D behavior with decreasing temperature. Cu substitutions in this series is suggested to give effect on c-axis coherence length, ξC(0) and hole concentration of carrier. For T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3) ceramics revealed 2D to 3D transition and showed Cu substitution affects the AL3D constant and increases c-axis coherence length, ξC(0) . Excess conductivity of T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ ceramics (x=0.0) showed exclusively 1D to 2D transition behavior. In addition, superconducting fluctuation behavior in sintered polycrystalline samples of T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x=0.1-0.4) revealed transition from 2-D to 3-D behavior. This study also suggests that there is a close correlation between the amounts of Yb substitution and the behavior of AL constant (A). Fourier Transform Infrared (FTIR) spectroscopy analyses was performed on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) and T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) samples. In T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), the results showed CuO2 planar oxygen mode observed was softened with increased Cu substitution indicating enhanced coupling between CuO2 planes. FTIR absorption data for T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) indicate possible tilt of oxygen atoms in the CuO2 plane as a result of unequal bond lengths and enhanced CuO2 inter-plane coupling. 2010 Thesis https://ir.uitm.edu.my/id/eprint/27305/ https://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf text en public masters Universiti Teknologi MARA Faculty of Applied Sciences
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Ceramic technology Pottery
spellingShingle	Ceramic technology Pottery Ahmad, Nurulhuda Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad
description	The study involves four different compounds ofT1Sr1212 superconductors. There are T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.6), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), T10.5Pb0.5Sr2-xMgx Ca0.8Yb0.2Cu2O7-δ (x=0-1.0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x = 0.1-0.4) series. All the samples were synthesized using the solid state synthesis method. Temperature dependent electrical resistance measurements on T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x = 0.006) series showed the best superconducting behavior at x=O.4 with zero resistance critical temperature (TC zero) of 77.6 K. On the other hand, electrical resistance measurements on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) series showed gradual decrease in TC zero followed by a sudden increase in TC at x = 0.3. Further substitution of Cu at x≥0.4 however caused TC to be suppressed. Electrical resistance measurement in T10.5Pb0.5Sr2-xMgxCa0.8Yb 0.2Cu2O7-δ (x=0-1.0) showed increasing semiconductor-like normal state behavior and gradual suppression of Tc with Mg. In addition, superconducting fluctuation behavior (SFB) in T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0.0-0.4), T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3), T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0) and T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x= 0.1-0.4) ceramics were analyzed by using Asmalazov-Larkin (AL) theory as a framework. In T11-xCuxSr1.8Yb0.2CaCu2O7-δ (x=0-0.4), the analysis showed characteristic cross-over from 2D to 3D behavior with decreasing temperature. Cu substitutions in this series is suggested to give effect on c-axis coherence length, ξC(0) and hole concentration of carrier. For T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.3) ceramics revealed 2D to 3D transition and showed Cu substitution affects the AL3D constant and increases c-axis coherence length, ξC(0) . Excess conductivity of T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ ceramics (x=0.0) showed exclusively 1D to 2D transition behavior. In addition, superconducting fluctuation behavior in sintered polycrystalline samples of T10.5Pb0.5Sr2-xYbxCaCu2O7-δ (x=0.1-0.4) revealed transition from 2-D to 3-D behavior. This study also suggests that there is a close correlation between the amounts of Yb substitution and the behavior of AL constant (A). Fourier Transform Infrared (FTIR) spectroscopy analyses was performed on T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5) and T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) samples. In T11-xCuxSr1.6Yb0.4CaCu2O7-δ (x=0-0.5), the results showed CuO2 planar oxygen mode observed was softened with increased Cu substitution indicating enhanced coupling between CuO2 planes. FTIR absorption data for T10.5Pb0.5Sr2-xMgxCa0.8Yb0.2Cu2O7-δ (x=0-1.0) indicate possible tilt of oxygen atoms in the CuO2 plane as a result of unequal bond lengths and enhanced CuO2 inter-plane coupling.
format	Thesis
qualification_level	Master's degree
author	Ahmad, Nurulhuda
author_facet	Ahmad, Nurulhuda
author_sort	Ahmad, Nurulhuda
title	Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad
title_short	Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad
title_full	Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad
title_fullStr	Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad
title_full_unstemmed	Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad
title_sort	effects of ti and sr site substitutions on superconductivity, structure and excess conductivity of tisr2cacu2o7-δ ceramics / nurulhuda ahmad
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Applied Sciences
publishDate	2010
url	https://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf
_version_	1783733952493649920

Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad

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