Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh

This thesis describes the synthesis of 111212 superconductor from various starting compositions via coprecipitation and solid-state methods and fabrication of T11212 dip-coated superconductor tapes. Bulk TI 1212 was synthesized from T108Bi02 Sr2Ca08Y02Cu207 nominal starting composition using copreci...

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Main Author:	Md. Salleh, Faizah
Format:	Thesis
Language:	English
Published:	2007
Subjects:	Electricity
Online Access:	https://ir.uitm.edu.my/id/eprint/5947/2/5947.pdf
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id	my-uitm-ir.5947
record_format	uketd_dc
spelling	my-uitm-ir.59472023-08-22T02:14:16Z Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh 2007 Md. Salleh, Faizah Electricity This thesis describes the synthesis of 111212 superconductor from various starting compositions via coprecipitation and solid-state methods and fabrication of T11212 dip-coated superconductor tapes. Bulk TI 1212 was synthesized from T108Bi02 Sr2Ca08Y02Cu207 nominal starting composition using coprecipitation method with TI-containing (CPI sample) and TI-free (CP3 sample) precursors. The 11-containing precursor route involves calcination of 11-containing precursor powder at 600 °C and sintering of the pellets at various temperatures and durations. The best superconducting sample with 1212 phase of 83 vol.% and Tczero of 94 K was sintered at 870°C for 60 minutes. However, the sample consists of minor T11201 phase and SrCO3 impurity. Addition of nano-MgO particles showed enhanced 1212-phase formation and total elimination of the SrCO 3 impurity. The transport J at 40 K in zero magnetic field for the sample with 0.15 wt.% nano-MgO additions was ten times the J of the sample without MgO and J measurements in external magnetic fields (0- 0.9 1) showed improved magnetic flux pinning property. To reduce Ti loss during sintering of the coprecipitated sample, Ti-free precursor route using two-step synthesis method was developed and was used to synthesize 111212 using the same composition as above. The TI-free precursor was first calcined at 850 °C followed by additions of appropriate amounts of 11203 and Bi203 before sintering at 1000°C for 6 minutes. This resulted in a higher purity sample with T,,,,, of 91 K, J at 40 K of 11.2 A/cm2 and ultrafine grains with average size of 0.5 - 1 m. For comparison purposes, bulk T11212 was also synthesized using Tl 05Pb05 Sr 18Yb02CaCu207 (SS1 sample) and Tl08Bi02 Sr2Ca0, 8Y02Cu207 (SS2 sample) nominal starting compositions using the conventional solid-state method. The results show that both SS1 and SS2 samples have T zero of 94 K and are comparable to the T zero of the coprecipitated samples. 2007 Thesis https://ir.uitm.edu.my/id/eprint/5947/ https://ir.uitm.edu.my/id/eprint/5947/2/5947.pdf text en public phd doctoral Universiti Teknologi MARA (UiTM) Faculty of Applied Sciences Yahya, Ahmad Kamal
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Yahya, Ahmad Kamal
topic	Electricity
spellingShingle	Electricity Md. Salleh, Faizah Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh
description	This thesis describes the synthesis of 111212 superconductor from various starting compositions via coprecipitation and solid-state methods and fabrication of T11212 dip-coated superconductor tapes. Bulk TI 1212 was synthesized from T108Bi02 Sr2Ca08Y02Cu207 nominal starting composition using coprecipitation method with TI-containing (CPI sample) and TI-free (CP3 sample) precursors. The 11-containing precursor route involves calcination of 11-containing precursor powder at 600 °C and sintering of the pellets at various temperatures and durations. The best superconducting sample with 1212 phase of 83 vol.% and Tczero of 94 K was sintered at 870°C for 60 minutes. However, the sample consists of minor T11201 phase and SrCO3 impurity. Addition of nano-MgO particles showed enhanced 1212-phase formation and total elimination of the SrCO 3 impurity. The transport J at 40 K in zero magnetic field for the sample with 0.15 wt.% nano-MgO additions was ten times the J of the sample without MgO and J measurements in external magnetic fields (0- 0.9 1) showed improved magnetic flux pinning property. To reduce Ti loss during sintering of the coprecipitated sample, Ti-free precursor route using two-step synthesis method was developed and was used to synthesize 111212 using the same composition as above. The TI-free precursor was first calcined at 850 °C followed by additions of appropriate amounts of 11203 and Bi203 before sintering at 1000°C for 6 minutes. This resulted in a higher purity sample with T,,,,, of 91 K, J at 40 K of 11.2 A/cm2 and ultrafine grains with average size of 0.5 - 1 m. For comparison purposes, bulk T11212 was also synthesized using Tl 05Pb05 Sr 18Yb02CaCu207 (SS1 sample) and Tl08Bi02 Sr2Ca0, 8Y02Cu207 (SS2 sample) nominal starting compositions using the conventional solid-state method. The results show that both SS1 and SS2 samples have T zero of 94 K and are comparable to the T zero of the coprecipitated samples.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Md. Salleh, Faizah
author_facet	Md. Salleh, Faizah
author_sort	Md. Salleh, Faizah
title	Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh
title_short	Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh
title_full	Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh
title_fullStr	Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh
title_full_unstemmed	Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh
title_sort	coprecipitation and solid-state synthesis of t11212 superconductors and fabrication of dip-coated tapes / faizah md. salleh
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Applied Sciences
publishDate	2007
url	https://ir.uitm.edu.my/id/eprint/5947/2/5947.pdf
_version_	1783733136333471744

Coprecipitation and solid-state synthesis of T11212 superconductors and fabrication of dip-coated tapes / Faizah Md. Salleh

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