Porosity Effect on Superconducting Properties of YBa₂Cu₃O_δ and YCaBa₄Cu₆O_δ

Abstract:

This paper reports on the properties of YBa₂Cu₃O_d (Y123) and YCaBa₄Cu₆Oy (Y146) with non-porous and porous structures. The relationship between calcium doping and critical temperature (T_c) was studied to determine the optimal superconducting properties. A series of heating and grinding via solid state reaction method was used to fabricate the ceramic materials. The electrical properties were investigated via critical temperature, T_C and critical current density, J_C using the resistivity measurement system (RMS). Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) were used to analyze the material morphology and structure, respectively. The orthorhombicity increased due to less porosity of the samples. The calcium presence partially replaced larger Ba(II) site and degraded orthorhombicity. The highest critical current density (J_C) was porous YCaBa₂Cu₃Oy which was 2.32 A/cm² compared to 0.75 A/cm² for porous YCaBa₄Cu₆Oy at 60 K. The critical temperature for porous structure was less than non porous structure for Ca doped Y146 system which was 69.9 K and 67.9 K. SEM micrograph unveiled that the Jc was induced significantly by continuity of grain formation via grain size. Pores homogenized the grains surface quality and connectivity due to strain release thus increasing effective cross section of the sample for current density (Jc) over the vast areas.

• Periodical: Advanced Materials Research (Volume 1107)
• Pages: 601-605
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1107.601
• Online since: June 2015
• Authors: S.A. Senawi, H. Azhan, W.N.F.W. Zainal, W.A.W. Razali, A. Nazree, K. Azman, H.J.M. Ridzwan, A.W. Norazidah, H.N. Hidayah, J.S. Hawa
• Keywords: Critical Temperature, Current Density, Superconductor, YBCO

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