Phase Formation and Transport Critical Current Density of Tl₂Ba₂CaCu₂O₈ Superconductor with Nano Bi₂O₃

Abstract:

The effect of nanosized Bi₂O₃ (150 nm) on the formation of the Tl₂Ba₂CaCu₂O₈ (Tl-2212) phase, transition temperature and transport critical current density has been studied. Samples with nominal starting composition Tl₂Ba₂CaCu₂O₈(Bi₂O₃)_x (x = 0 to 0.5 wt. %) were prepared using the solid state reaction method. Most samples except x = 0.5 showed a mixed phase consisting of the Tl₂Ba₂CaCu₂O₈ and Tl₂Ba₂Ca₂Cu₃O₁₀ (Tl-2223). The x = 0.5 sample showed a single Tl-2212 phase. However, the transition temperature, T_c of the x = 0.5 was very much suppressed (T_onset = 106 K, T_{c zero} 88 K). All samples showed random grain size and orientation, with partial melting and high porosity. The x = 0.1 mixed phase sample showed the highest transport critical current density of 285 mA/cm² at liquid nitrogen temperature (78 K).

• Periodical: Solid State Phenomena (Volume 268)
• Pages: 320-324
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.268.320
• Online since: October 2017
• Authors: I.M.O. Dabaa, Roslan Abd-Shukor*
• Keywords: Nano-Sized Bi₂O₃, Tl₂Ba₂CaCu₂O₈, Transport Current Density

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