Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/365040
Title: Study of substitution effects on structure and properties of high temperature superconductors and isostructure compunds
Researcher: N V, Ashoka
Guide(s): Thomas C, George
Keywords: Physical Sciences
Physics
Physics Applied
University: CHRIST University
Completed Date: 2016
Abstract: The thesis mainly describes the investigation of the structural formation of higher order members of bismuth system of superconductors Bi1.6sPb0.35Sr2CazCu4Oy (n = 4, 2234 phase), Bi1.6sPb0.35Sr2Ca4CusOy (n = 5, 2245 phase) and Bi1.65Pb0.35Sr2CasCu,Oy (n = 9, 2289 phase). The samples were synthesized by solid state reaction technique. Micro-structural and morphological features of the synthesized samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). The XRD pattern of all the samples revealed the presence of Bismuth 2212 and 2223 phases of which 2223 phase was found to be the predominant. Superconducting transition temperature (Tc) of the samples measured by self-inductance method and dc four probe method showed Tc value around 110 K. There was no signature of the formation of 2234, 2245 or 2289 phases in this investigation. newlineFormation of Bi-2245 compound was further investigated by preparing the sample in a new matrix route. The Tc on set of this sample was found to be 127 K which was the highest reported ever in bismuth system superconductors. The complete replacement of copper by nickel in bismuth system superconductor Bi2SraCu06 (2201) was ttempted by preparing the sample in air by solid state reaction method under open and closed environment. Morphological and microstructural features of the synthesized sample Bi2Sr2Ni0g was investigated by X-ray diffraction, SEM and EDAX. The analysis of X-ray diffraction pattern revealed that nickel can replace copper completely and form a single phase Bi2Sr2Ni06 only when prepared in a closed environment in air. This phase formation of BizSr2NiOo was reported first time. newline
Pagination: xviii, 136p.;
URI: http://hdl.handle.net/10603/365040
Appears in Departments:Department of Physics and Electronics

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02_declaration.pdf187.06 kBAdobe PDFView/Open
03_certificate.pdf288.22 kBAdobe PDFView/Open
04_acknowledgements.pdf134.94 kBAdobe PDFView/Open
05_abstract.pdf68.29 kBAdobe PDFView/Open
06_contents.pdf91.41 kBAdobe PDFView/Open
07_list_of_tables.pdf20.15 kBAdobe PDFView/Open
08_list_of_figures_and_graphs.pdf136.08 kBAdobe PDFView/Open
09_list_of_abbreviations.pdf46.16 kBAdobe PDFView/Open
10_chapter1.pdf1.84 MBAdobe PDFView/Open
11_chapter2.pdf1.44 MBAdobe PDFView/Open
12_chapter3.pdf3.1 MBAdobe PDFView/Open
13_chapter4.pdf1.25 MBAdobe PDFView/Open
14_chapter5.pdf1.67 MBAdobe PDFView/Open
15_chapter6.pdf1.53 MBAdobe PDFView/Open
16_chapter7.pdf365.08 kBAdobe PDFView/Open
17_bibliography.pdf911.92 kBAdobe PDFView/Open
18_list_of_publications.pdf138.75 kBAdobe PDFView/Open
80_recommendation.pdf578.04 kBAdobe PDFView/Open
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