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All Journal AMPLITUDO: Journal of Science & Technology Innovation Journal of Material Science and Radiation
Karim, Muhammad Khalis Abdul
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Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Materials Science & Nanotechnology Physics

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Influence of Carbon Nanotubes in Improving the Superconducting and Structural Properties of Bulk Bi-2212 Synthesis by Thermal Treatment Method Sukor, Safia Izzati Abd; Kechik, Mohd Mustafa Awang; Kamarudin, Aliah Nursyahirah; Shaari, Abdul Halim; Kien, Chen Soo; Pah, Lim Kean; Shariff, Khairul Khaizi Mohd; Shabdin, Muhammad Kashfi; Yaakob, Yazid; Karim, Muhammad Khalis Abdul; Doyan, Aris
AMPLITUDO : Journal of Science and Technology Innovation Vol. 3 No. 2 (2024): August
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/amplitudo.v3i2.224

Abstract

Bi-2212 superconductor has garnered significant interest in recent years due to its potential applications in the development of superconducting wires and tapes. The effect of introducing carbon nanotubes (CNT) into the Bi-2212 system was investigated in terms of superconducting and structural properties. The results of this study indicated that the addition of CNTs had a notable effect on the phase formation of Bi-2212,  with a substantial increase from 86.8% to 97.4% for the sample with a weight percentage of 0.8 wt.%.  This can be attributed to the improved particle orientation brought about by the introduction of CNTs.  The microstructure analysis displayed randomly distributed grains of irregular shapes, with a reduced average grain size of 1.018 μm upon the addition of 0.4 wt.% CNTs. Additionally, the inclusion of CNTs led to an increase in the Tc value, with the maximum Tc-onset recorded at 79 K for the sample containing 0.6 wt.% CNTs.  In summary CNT has enhanced the structural  and the superconducting properties of the Bi-2212 synthesised with thermal treatment method.
Comparative Characterisation of Structural and Superconducting Properties of Y-123 and Y-247 Synthesised by Thermal Treatment at 980 °C Yap, Siew Hong; Er, Tai Pao; Kechik, Mohd Mustafa Awang; Karim, Muhammad Khalis Abdul; Baqiah, Hussien; Chen, Soo Kien; Lim, Kean Pah; Shabdin, Muhammad Kashfi; Hapipi, Nurhidayah Mohd; Kamarudin, Aliah Nursyahirah; Mohamed, Arebat Ryad Alhadei; Doyan, Aris; Shaari, Abdul Halim
Journal of Material Science and Radiation Vol. 1 No. 3 (2025): December
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/jmsr.v1i3.425

Abstract

This study presents a comparative analysis of the structural and superconducting properties of YBa₂Cu₃O₇−δ (Y-123) and Y₂Ba₄Cu₇O₁₅−δ (Y-247) superconductors synthesised via a thermal treatment method at 980 °C. Metal nitrates were used as starting precursors, with polyvinylpyrrolidone (PVP) serving as a capping agent to enhance dispersion and control microstructure. X-ray diffraction (XRD) confirmed that Y-123 and Y-247 were the dominant phases in their respective samples, although minor peaks of BaCuO₂ were detected, indicating the presence of secondary phases. Scanning electron microscopy (SEM) revealed that Y-247 exhibited larger grain morphology and higher porosity than Y-123, suggesting that the chosen sintering temperature exceeds the thermal stability range for the Y-247 phase. Electrical resistivity measurements showed a single superconducting transition for both samples, with Y-123 exhibiting a sharper transition width (ΔTc = 8.1 K) compared to Y-247, indicating better grain connectivity and phase uniformity. Energy dispersive X-ray spectroscopy (EDX) supported the elemental presence of Y, Ba, Cu, and O in both samples, though variations in stoichiometry were attributed to secondary phases. The observed expansion in the c-axis lattice of Y-247, combined with its higher porosity, points to oxygen loss during sintering, which contributes to the reduced superconducting performance. Overall, the results confirm that both Y-123 and Y-247 can be successfully synthesised using a simple and environmentally friendly thermal treatment method. However, Y-123 exhibits better structural integrity and superconducting performance at the high sintering temperature of 980 °C, making it a more promising candidate for large-scale production of bulk high-temperature superconductors.
Co-Authors Aris Doyan Baqiah, Hussien Chen, Soo Kien Er, Tai Pao Hapipi, Nurhidayah Mohd Kamarudin, Aliah Nursyahirah Kechik, Mohd Mustafa Awang Kien, Chen Soo Lim, Kean Pah Mohamed, Arebat Ryad Alhadei Pah, Lim Kean Shaari, Abdul Halim Shabdin, Muhammad Kashfi Shariff, Khairul Khaizi Mohd Sukor, Safia Izzati Abd Yaakob, Yazid Yap, Siew Hong