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• W3199883287 abstract "In this work, superconducting properties of YBa2Cu3O7-δ (Y-123) reacted with 5.0 mol.%of Y2O3 and different molar percentages (mol.%) of BaZrO3 (BZO) nanoparticles werestudied. Series 1 samples are Y-123 reacted with x mol.% BZO nanoparticles and Series2 samples are Y-123 reacted with 5.0 mol.% of Y2O3 and x mol.% BZO nanoparticles (x= 0.0 – 7.0 mol.%). The samples were prepared using co-precipitation (COP) method.The phase formation, microstructure, magnetic and electrical properties of the sampleswere investigated using thermogravimetric analysis (TGA), X-ray diffraction (XRD),scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX),temperature dependence of resistance measurement, and alternating currentsusceptibility (ACS). XRD patterns indicated that all of the samples could be indexed tospace group (Pmmm) with orthorhombic crystal structure. Y-123 is the major phase whileY-211 was detected as minor secondary phase in all the samples. Besides, BZO peaksstarted to appear when its addition level was increased from 1.0 mol.%. The SEM imagesshowed that all the samples have irregular shaped grains and they are randomlydistributed. The average grains size for both series increased in the range of 0.30 μm to0.50 μm with increasing amount of BZO nanoparticles addition. Yet, the grain size forSeries 2 samples is slightly higher than that in Series 1 indicating that Y2O3 may promotegrain growth. The temperature dependence of resistance measurements showed ametallic behaviour at normal state and a superconducting transition to zero resistance forall the samples. The value of Tc for the pure sample is 91.6 K and it decreased to 81.5 Kand 87.6 K for Series 1 and Series 2 samples, respectively for 7.0 mol.% BZO addition.The Tc values and the transition width, ΔTc for the Series 2 are slightly higher than Series1. The higher value of transition width, ΔTc shows the degradation of homogeneity withinthe samples. The ACS measurement showed the decreasing of Tc-onset, Tcj and Tp with theincrease of BZO nanoparticles addition for all the samples. The decrease of Tcj and Tp is due to the weakening of the intergranular coupling and the decrease of pinning forces.The obtained Io and Jcm for Series 2 are higher than that for Series 1 indicating that thegrain coupling of the former is stronger. As a conclusion, the results shows that the coadditionof Y2O3 and BZO (Series 2) can maximize the Jcm value and improve a fluxpinning if compared to the addition of BZO only (Series 1). However, the optimum valuefor co-addition of BZO is only up to 2.0 mol.% since further addition will degrade thesuperconductivity of the samples. The highest Jcm is 2.096 A/ cm2 for co-addition of 2.0mol.% BZO and Y2O3." @default.
• W3199883287 created "2021-09-27" @default.
• W3199883287 creator A5060838458 @default.
• W3199883287 date "2017-12-01" @default.
• W3199883287 modified "2023-09-23" @default.
• W3199883287 title "Structural, magnetic and electrical properties of YBCO-123 superconductor reacted with Y₂O₃ and BaZrO₃ nanoparticles" @default.
• W3199883287 hasPublicationYear "2017" @default.
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