The effect of Pr substitution at sr sites in 110K phase of (Bi-Pb)-Sr-Ca-Cu-O superconducting ceramics / Nazarin Nordin

Nordin, Nazarin (2007) The effect of Pr substitution at sr sites in 110K phase of (Bi-Pb)-Sr-Ca-Cu-O superconducting ceramics / Nazarin Nordin. Masters thesis, Universiti Teknologi MARA.

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The effect of magnetic Praseodymium (Pr) substitutional doping at varying concentration into the Strontium (Sr) site in the Bi-Sr-Ca-Cu-0 (BSCCO) high temperature superconductor is investigated. The samples are prepared via solid state reaction method and underwent sintering, annealing and resintering process. The two measured properties are the electrical and the structural properties according to the stoichiometric formula (Bii6Pbo.4)-(Sri.JtPrt)2-Ca2-Cu3-05 where x = 0.0 - 0.5. For all series of doping concentration, x = 0.0 - 0.5, Tc (onset) decreased for x = 0.1, then slightly increased at x = 0.2. The Tc then gradually decreased as x is increased and approaches zero as x > 0.5. The onset of critical temperature Tc and zero resistance critical temperature Tc (R=O) as x increases indicated the superconductivity destructive trend. Interestingly, at x = 0.2, the destructive trend was reversed, but as x > 0.2, critical transition temperature is lowered. Critical current density, jc was also optimised for x = 0.2 samples. Longer sintering and annealing also improves the Tc and this is shown in x - 0.2 sample. At x = 0.2 sample, the Tc (onset) for sintered, annealed (at 820 °C) and resintered samples are nearly identical to pure sample.

Item Type: Thesis (Masters)
CreatorsID Num.
Nordin, NazarinUNSPECIFIED
Subjects: Q Science > QC Physics
Q Science > QC Physics > Electricity and magnetism > Electricity > Electric current (General) > Electric conductivity > Superconductivity physics > Superconducting materials. Superconductors
Divisions: Faculty of Applied Sciences
Item ID: 596
Uncontrolled Keywords: Praseodymium, Strontium, structural properties, temperature
Last Modified: 01 Jul 2016 03:57
Depositing User: Staf Pendigitalan 1

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