Effect of Ni_0.5Zn_0.5Fe₂O₄ Nanoparticles Addition on Tl-1212 High Temperature Superconductor

Abstract:

The effects of Ni_0.5Zn_0.5Fe₂O₄ nanoparticle addition on the superconducting and transport properties of (Tl_0.85Cr_0.15)Sr₂CaCu₂O₇ (Tl-1212) superconductor were investigated in this paper. The Tl-1212 samples were produced by mixing high purity oxide powders through a solid-state reaction method. Nano Ni_0.5Zn_0.5Fe₂O₄ particles with compositions of 0.001 wt.%, 0.003 wt.%, 0.005 wt.%, 0.01 wt.% and 0.02wt.% with average size of 60 nm were added into the Tl-1212 powders. The transition temperatures (T_c-zero and T_c-onset) were measured using a four-point probe method. The highest T_c-zero recorded was 97 K which was exhibited by the pure Tl-1212 sample. The transport critical current, I_c, of the Tl-1212 samples were found through the 1 µV/cm criterion with temperature ranging from 30 K to 77 K. The sample with a composition of 0.003 wt.% displayed the highest value of J_c at 77 K with a value ranging up to 1780 mA/cm². The Tl-1212 samples were characterised using scanning electron microscopy (SEM), powder X-ray diffraction method (XRD), energy dispersive X-Ray analysis (EDX), electrical resistance measurements and transport critical current density measurements. The J_c of the Tl-1212 superconductor has been improved through the addition of Ni_0.5Zn_0.5Fe₂O₄ nanoparticles but adding an excessive amount has caused its J_c to degrade.

• Periodical: Solid State Phenomena (Volume 307)
• Pages: 98-103
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.307.98
• Online since: July 2020
• Authors: Wei Kong, Christopher Jacob, Ing Kong, Cin Kong, Eng Hwa Yap, Roslan Abd-Shukor
• Keywords: Critical Current Density, Nanoparticles, Nickel Zinc Ferrite, Tl-1212 Superconductor

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