Effect of Heat Treatment on Ca Substitution in a Porous Y(Ba1-xCax)2Cu3O7-δ Superconductor

Abd Wahab Norazidah; Azhan Hashim; Azman Kasim; Hassan Nurul Hidayah; J.S. Hawa

doi:10.4028/www.scientific.net/AMR.895.71

Paper Titles

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Effect of High Intensity Light Irradiance on CuInSe₂ Thin Films
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Effects of Nitridation Temperatures on Gallium Nitride Thin Films Formed on Silicon Substrates
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Morphology and Optical Studies of (1-x)ZnAl₂O₄ – xSiO₂ Thin Films Prepared by Sol-Gel Method
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Effect of Heat Treatment on Ca Substitution in a Porous Y(Ba_1-xCa_x)₂Cu₃O_7-δSuperconductor
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Effects of (La_0.67Ca_0.33MnO₃)x (x= 0.0, 0.8, 1.0) Additions on the Structural and Superconducting Transition Temperature of YBa₂Cu₃O_7-δSystem
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Comparison of K, Ca and Zn Substitution on the Superconducting and Structural Properties of YBa₂Cu_3-xM_XO_δ
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Properties of Rare-Earth Substitution in Bi(Pb)-2223 Superconductor Prepared by Coprecipitation Method
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Effects of Nano-Sized NiF₂ Addition in Bi_1.4Pb_0.6Sr₂Ca₂Cu₃O_10+δ Superconductor
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Effect of Heat Treatment on Ca Substitution in a Porous Y(Ba_1-xCa_x)₂Cu₃O_7-δSuperconductor

Abstract:

The effect of heat treatment on the superconducting properties of porous Y(Ba_1-xCa_x)₂Cu₃O_δ with Ca substitution x = 0.00, 0.10, 0.20, and 0.30 via a solid-state reaction method have been investigated. The superconducting parameters, zero critical temperature, T_{c zero} and critical current density, J_cwere measured by the standard four point probe method in the temperature range from 20 K to 300 K, while the morphology of the samples was investigated by field emission scanning electron microscopy (FESEM). In addition structural identification was also investigated. All the samples received a heat treatment at 900 °C for 5 hours, and the J_c improved from 1.410 A/cm² to 7.013 A/cm²for x = 0.30 at 60 K. The heat treatment process did not change the morphology, while the crystallographic structure remained orthorhombic structure. The lattice parameter cdecreased, and the volume of the unit-cell with increasing Ca substitution.The heat treatment also led to an improvement in oxygen content to nearly 7.