The influence of sintering and Sb content on the formation of high temperature superconducting phase in Bi(Pb)-Sr-Ca-Cu-O system
- Punjab Univ., Lahore (Pakistan). Centre for Solid State Physics
- Quaid-i-Azam Univ., Islamabad (Pakistan). Dept. of Physics
Six different compositions in (Bi{sub 1.5}Pb{sub 0.5{minus}x}Sb{sub x})Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (with x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared by the solid state reaction method. Sintering at different temperatures (between 800--860 C) and time periods has been carried out in order to study its effect on {Tc} values. The samples have been characterized by x-ray powder diffraction (XRD), Scanning Electron microscopy (SEM) and measurement of resistance at various temperatures. The study reveals that the incorporation of Sb up to x = 0.2 promotes the formation of a high-{Tc} 2223 phase and large sintering time helps in reducing the number of unwanted phases. Compositions with x {ge} 0.3 result in the formation of a new monoclinic 4441 phase (along with 2223 and 2212 minor phases) which is non-superconducting down to 77 K. Sintering time at 860 C for samples with x = 0.0, 0.1, 0.2 and 0.3 affects the respective {Tc} values and the maximum values observed are 94 K, 96 K, 100 K and 87 K, respectively. The samples with x = 0.4 and 0.5 do not superconduct up to 77 K.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 194895
- Journal Information:
- International Journal of Modern Physics B, Journal Name: International Journal of Modern Physics B Journal Issue: 28 Vol. 9; ISSN IJPBEV; ISSN 0217-9792
- Country of Publication:
- United States
- Language:
- English
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