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<p>This study explores the impact of calcination temperature on the characteristics of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ</sub> (Y-123) ceramic superconductors, synthesized using a novel modified thermal decomposition (MTD) method. It aims to optimize the relationship between calcination conditions and superconductor performance, which is critical for advancing the utility of high-temperature superconductors (HTS). The calcination process involved two distinct temperatures: 850&#xa0;°C (Group A) and 910&#xa0;°C (Group B), each sustained for a duration of 24&#xa0;h. Following calcination, the samples underwent sintering at varying temperatures: 920&#xa0;°C, 950&#xa0;°C, and 980&#xa0;°C. This process facilitates the examination of how thermal treatment affects the structure-property relationship to find the best conditions for enhanced superconductor performance. The characterization techniques employed encompassed thermogravimetric analysis (TGA/DTG), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and four-point probe measurements (4PP). Thermal stability was examined using TGA-DTA analysis. The XRD analysis revealed the existence of the orthorhombic structure featuring the Y-123 phase in both Group A and Group B with a minor secondary phase, Y<sub>2</sub>BaCuO<sub>5</sub> (Y211). The samples calcined at 910&#xa0;°C exhibited the highest critical temperatures, such as <i>T</i><sub><i>c−onset</i></sub> (93.72&#xa0;K) and <i>T</i><sub><i>c−zero</i></sub> (90.27&#xa0;K), with the lowest superconducting transition width, Δ<i>T</i><sub><i>c</i></sub> (3.45&#xa0;K), at a sintering temperature of 980&#xa0;°C. Furthermore, an increase in both homogeneity and density was noted with the gradual rise in sintering temperature. FESEM analysis revealed that the sample in Group B exhibited the most densely compacted grain structure and the highest <i>T</i><sub><i>c−zero</i></sub>, implying that enhanced interconnectivity among the grains leads to an elevation in <i>T</i><sub><i>c−zero</i></sub>. This study underscores the significance of precise thermal processing and introduces a viable method for synthesizing high-<i>T</i><sub><i>c</i></sub> superconductors.</p>

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Impact of calcination temperature on the microstructure and superconductivity of YBa2Cu3O7−δ ceramic prepared via modified thermal decomposition method

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Ryad Alhadei Mohamed Arebat,
  • Mohd Mustafa Awang Kechik,
  • Hussien Baqiah,
  • Chen Soo Kien,
  • Lim Kean Pah,
  • Khairul Khaizi Mohd Shariff,
  • Abdul Halim Shaari,
  • Yap Siew Hong,
  • Nur Afiqah Mohamed Indera Alim Sah,
  • Muralidhar Miryala

摘要

This study explores the impact of calcination temperature on the characteristics of YBa2Cu3O7−δ (Y-123) ceramic superconductors, synthesized using a novel modified thermal decomposition (MTD) method. It aims to optimize the relationship between calcination conditions and superconductor performance, which is critical for advancing the utility of high-temperature superconductors (HTS). The calcination process involved two distinct temperatures: 850 °C (Group A) and 910 °C (Group B), each sustained for a duration of 24 h. Following calcination, the samples underwent sintering at varying temperatures: 920 °C, 950 °C, and 980 °C. This process facilitates the examination of how thermal treatment affects the structure-property relationship to find the best conditions for enhanced superconductor performance. The characterization techniques employed encompassed thermogravimetric analysis (TGA/DTG), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and four-point probe measurements (4PP). Thermal stability was examined using TGA-DTA analysis. The XRD analysis revealed the existence of the orthorhombic structure featuring the Y-123 phase in both Group A and Group B with a minor secondary phase, Y2BaCuO5 (Y211). The samples calcined at 910 °C exhibited the highest critical temperatures, such as Tc−onset (93.72 K) and Tc−zero (90.27 K), with the lowest superconducting transition width, ΔTc (3.45 K), at a sintering temperature of 980 °C. Furthermore, an increase in both homogeneity and density was noted with the gradual rise in sintering temperature. FESEM analysis revealed that the sample in Group B exhibited the most densely compacted grain structure and the highest Tc−zero, implying that enhanced interconnectivity among the grains leads to an elevation in Tc−zero. This study underscores the significance of precise thermal processing and introduces a viable method for synthesizing high-Tc superconductors.