Comparison of K, Ca and Zn Substitution on the Superconducting and Structural Properties of YBa2Cu3-xMXOδ

Hassan Nurul Hidayah; S.Y.S. Yahya; H. Azhan; K. Azman; J.S. Hawa; A.W. Norazidah

doi:10.4028/www.scientific.net/AMR.895.79

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 895Comparison of K, Ca and Zn Substitution on the...

Comparison of K, Ca and Zn Substitution on the Superconducting and Structural Properties of YBa₂Cu_3-xM_XO_δ

Abstract:

The comparison substitution with K, Ca and Zn respectively at the Cu site of YBa₂Cu_3-xM_xO_δ (x = 0.00 and 0.20) was performed based on superconducting and structural properties. All samples were prepared via a solid state technique. Resistivity and current density measurements (zero magnetic fields) were done using the four probe method and the structural and morphological properties were characterized using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM) respectively. The critical current density (J_c) and critical temperature (T_{c zero}) of the substituted samples were found to be lower than that of the pure sample. T_{c zero} with K and Zn substitution was 78 K and 21 K respectively. This is due to the change in the hole concentration. J_c measured at 50 K showed values of 3.9790 A/cm², 4.4483 A/cm² and 2.9854 A/cm² for the pure sample, K and Ca substituted samples respectively. The decrease in J_c was due to the hole porosity and grain connection. All samples showed an orthorhombic crystal structure. The morphology of the fracture surface of samples as observed by FESEM displayed a loose structure of grain arrangement for sample Ca and Zn substituted samples.

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Advanced Materials Research (Volume 895)

Pages:

79-82

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.895.79

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Online since:

February 2014

Authors:

Hassan Nurul Hidayah, S.Y.S. Yahya, H. Azhan, K. Azman, J.S. Hawa, A.W. Norazidah

Keywords:

Critical Temperature, Structural Property, Superconductor, YBCO

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