The Effect of Cd and Nb on Bi-1212 System

The 1212 phase of Bi-based superconductor by theory has good properties in terms of structure and transition temperature, as it is an adaptation of the Y123 system and the Bi22 12 system. The new Bi1212 system with stoichiometries (Bi0.2Pb0.6Mx)Sr2(Y0.3Ca0.7)Cu2.05O and ( B ~ ~ . ~ P ~ ~(, ~ ~~M...

Full description

Saved in:

Bibliographic Details
Main Author:	Awang Teh, Azman
Format:	Thesis
Language:	English English
Published:	2004
Subjects:	Superconductors - Thermal properties
Online Access:	http://psasir.upm.edu.my/id/eprint/6335/1/FSAS_2004_11.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-upm-ir.6335
record_format	uketd_dc
spelling	my-upm-ir.63352023-10-23T08:10:06Z The Effect of Cd and Nb on Bi-1212 System 2004-06 Awang Teh, Azman The 1212 phase of Bi-based superconductor by theory has good properties in terms of structure and transition temperature, as it is an adaptation of the Y123 system and the Bi22 12 system. The new Bi1212 system with stoichiometries (Bi0.2Pb0.6Mx)Sr2(Y0.3Ca0.7)Cu2.05O and ( B ~ ~ . ~ P ~ ~(, ~ ~~M. ,~) s~~a~ w ~he.re ~M =) C~d anud N~b, .x =~ 0, ~0.005, 0~.1, 0.15, 0.2,0.25 has been successfully synthesized and characterized by means of X-Ray (powder) diffraction, scanning electron microscope, AC susceptibility and resistivity measurements. For the composition of ( B ~ ~ , ~ P ~ ~ , ~ M ~ ) sth~e ~ ( Y ~ , above stated systematic examinations clarified the effect of Cd and Nb on Bi-1212 phase, both as a substitution (0 < x i 0.2) and as an addition (x = 0.25). All samples were prepared using solid-state reaction. These samples underwent sintering process at two different temperatures, which were 960°C and 980°C, for a time duration of 2 hours and 10 hours. Then all the samples underwent heat treatment in flowing argon at 750°C for 10 hours. All the samples were orthorhombic with the space group Pmmm except the compounds with composition ( ~ i ~ ~ ~ (~ ~b~~, ~~ ~ a~ ~dan,d ~~ ,) ~~ u~ ~) ( ~ i ~ ~ ~ (~ ~b~ ~, ~, ~~a ~~w.~hic~hd w)er~e suin~te~re~d. at~~ 96~0)°C0 f~o~r 2r, ho u~rs were tetragonal with space group P4mmm. The X-ray diffraction pattern showed that all samples were in mixed phase (12 12 and 221 2) with 12 12 acting as a dominant phase. All as-prepared samples showed non-superconducting properties below 20 K, but after heat treatment in flowing argon, some of them showed superconducting properties with the highest transition temperature of Tc,ze,,=64 K and Tc, ,,,et=80 K obtained from Nb-doping sample with x=0.2. The ac susceptibility studies showed that most of the superconducting material exhibited weak grain conductivity. The surface morphology of most of the samples observed from scanning electron microscope showed a layered-slab texture. Superconductors - Thermal properties 2004-06 Thesis http://psasir.upm.edu.my/id/eprint/6335/ http://psasir.upm.edu.my/id/eprint/6335/1/FSAS_2004_11.pdf text en public masters Universiti Putra Malaysia Superconductors - Thermal properties Science and Environmental Studies Shaari, Abdul Halim English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Shaari, Abdul Halim
topic	Superconductors - Thermal properties
spellingShingle	Superconductors - Thermal properties Awang Teh, Azman The Effect of Cd and Nb on Bi-1212 System
description	The 1212 phase of Bi-based superconductor by theory has good properties in terms of structure and transition temperature, as it is an adaptation of the Y123 system and the Bi22 12 system. The new Bi1212 system with stoichiometries (Bi0.2Pb0.6Mx)Sr2(Y0.3Ca0.7)Cu2.05O and ( B ~ ~ . ~ P ~ ~(, ~ ~~M. ,~) s~~a~ w ~he.re ~M =) C~d anud N~b, .x =~ 0, ~0.005, 0~.1, 0.15, 0.2,0.25 has been successfully synthesized and characterized by means of X-Ray (powder) diffraction, scanning electron microscope, AC susceptibility and resistivity measurements. For the composition of ( B ~ ~ , ~ P ~ ~ , ~ M ~ ) sth~e ~ ( Y ~ , above stated systematic examinations clarified the effect of Cd and Nb on Bi-1212 phase, both as a substitution (0 < x i 0.2) and as an addition (x = 0.25). All samples were prepared using solid-state reaction. These samples underwent sintering process at two different temperatures, which were 960°C and 980°C, for a time duration of 2 hours and 10 hours. Then all the samples underwent heat treatment in flowing argon at 750°C for 10 hours. All the samples were orthorhombic with the space group Pmmm except the compounds with composition ( ~ i ~ ~ ~ (~ ~b~~, ~~ ~ a~ ~dan,d ~~ ,) ~~ u~ ~) ( ~ i ~ ~ ~ (~ ~b~ ~, ~, ~~a ~~w.~hic~hd w)er~e suin~te~re~d. at~~ 96~0)°C0 f~o~r 2r, ho u~rs were tetragonal with space group P4mmm. The X-ray diffraction pattern showed that all samples were in mixed phase (12 12 and 221 2) with 12 12 acting as a dominant phase. All as-prepared samples showed non-superconducting properties below 20 K, but after heat treatment in flowing argon, some of them showed superconducting properties with the highest transition temperature of Tc,ze,,=64 K and Tc, ,,,et=80 K obtained from Nb-doping sample with x=0.2. The ac susceptibility studies showed that most of the superconducting material exhibited weak grain conductivity. The surface morphology of most of the samples observed from scanning electron microscope showed a layered-slab texture.
format	Thesis
qualification_level	Master's degree
author	Awang Teh, Azman
author_facet	Awang Teh, Azman
author_sort	Awang Teh, Azman
title	The Effect of Cd and Nb on Bi-1212 System
title_short	The Effect of Cd and Nb on Bi-1212 System
title_full	The Effect of Cd and Nb on Bi-1212 System
title_fullStr	The Effect of Cd and Nb on Bi-1212 System
title_full_unstemmed	The Effect of Cd and Nb on Bi-1212 System
title_sort	effect of cd and nb on bi-1212 system
granting_institution	Universiti Putra Malaysia
granting_department	Science and Environmental Studies
publishDate	2004
url	http://psasir.upm.edu.my/id/eprint/6335/1/FSAS_2004_11.pdf
_version_	1783725730805317632

The Effect of Cd and Nb on Bi-1212 System

Similar Items