Date of Publication
4-1997
Document Type
Master's Thesis
Degree Name
Master of Science in Physics
Subject Categories
Physics
College
College of Science
Department/Unit
Physics
Thesis Adviser
Shirley Tiong Palisoc
Defense Panel Chair
Reuben V. Quiroga
Defense Panel Member
Robert C. Roleda
Alex Quema
Abstract/Summary
The melt quenched method is applied in the fabrication of Bi1.6Pb0.4Sr2Ca2Cu3Oy superconducting ceramics. The samples were prepared as determined by its stoichiometric composition by melting it at 1080 degrees Centigrade for five minutes. The melts were poured immediately onto a stainless steel plate and quenched to room temperature. The samples were ground, pelletized and annealed at a constant temperature of 840 degrees Centigrade for 24 hours. Three trials were made to verify the results. The effects of melting the lead doped BSCCO were investigated using SEM/EDAX, DTA, XRD and X-T analyses. The superconducting phase appeared even in the as-quenched samples. Glass forming tendency is also remarkably retarded. Annealing at 840 degrees Centigrade for 24 hours completely vanished this glass forming ability. XRD results showed the coexistence of the low Tc, high Tc and several non superconducting phases. EDAX results show several impurity phases that inhibit the formation of the 2212 and 2223 phases. DTA results show that a decrease in the endothermic peak intensity suggest a slower nucleaction and an increase in the grain size of the sample. This is consistent with the SEM results. Tc onset was strongly dependent on the amount of non superconducting impurities, grain size and intensity of the endothermic peak that affects the phase formation in the partially melted state.
Abstract Format
html
Language
English
Format
Electronic
Accession Number
TG02620
Shelf Location
Archives, The Learning Commons, 12F Henry Sy Sr. Hall
Physical Description
71 leaves
Keywords
Superconductivity; Glass-ceramics; Melting points; Metals--Quenching
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Recommended Citation
Penaranda, P. (1997). A study on the formation of the high-Tc superconducting phase of Bi1.6Pbo4Sr2Ca2Cu3Oy as determined by the melt quenched precursors. Retrieved from https://animorepository.dlsu.edu.ph/etd_masteral/1808
