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...

Full description

Bibliographic Details
Main Author:	Ahmad, Nurulhuda
Format:	Thesis
Language:	English
Published:	2010
Subjects:	Ceramic technology. Pottery
Online Access:	http://ir.uitm.edu.my/id/eprint/27305/ http://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf

id	uitm-27305
recordtype	eprints
spelling	uitm-273052020-01-15T08:28:11Z http://ir.uitm.edu.my/id/eprint/27305/ Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad 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 NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf Ahmad, Nurulhuda (2010) Effects of TI and Sr site substitutions on superconductivity, structure and excess conductivity of TISr2CaCu2O7-δ ceramics / Nurulhuda Ahmad. 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	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
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
publishDate	2010
url	http://ir.uitm.edu.my/id/eprint/27305/ http://ir.uitm.edu.my/id/eprint/27305/1/TM_NURULHUDA%20AHMAD%20AS%2010_5.pdf
first_indexed	2023-09-18T23:18:13Z
last_indexed	2023-09-18T23:18:13Z
_version_	1777419255772348416

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

Similar Items