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<p>The processing conditions for the fabrication of highly dense BiCuSeO pellets were systematically investigated and optimized. Ball-milled precursor powders were subjected to controlled calcination followed by consolidation via spark plasma sintering. While the combined influence of ball milling and calcination has been widely explored, the specific role of calcination time in ball-milled BiCuSeO systems remains insufficiently understood. In this study, the evolution of structural and microstructural characteristics was systematically examined as a function of ball milling duration and calcination time. The results reveal a non-monotonic grain evolution behavior, governed by the interplay between diffusion-driven grain growth and defect-mediated growth inhibition at prolonged calcination durations. Quantitative analysis of crystallite size, microstrain, and grain size distribution establishes a clear correlation between processing parameters and structural perfection. These findings provide new insights into the processing–structure relationship in BiCuSeO and enable the identification of optimized conditions that promote phase purity, improved powder characteristics, and enhanced thermal stability for thermoelectric applications.</p>

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Calcination induced modifications in BiCuSeO oxyselenide electronic materials

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Rohit Yadav,
  • Kriti Tyagi,
  • Sandhiya Lakshmanan,
  • Rajdeep Singh Rawat,
  • S. R. Dhakate

摘要

The processing conditions for the fabrication of highly dense BiCuSeO pellets were systematically investigated and optimized. Ball-milled precursor powders were subjected to controlled calcination followed by consolidation via spark plasma sintering. While the combined influence of ball milling and calcination has been widely explored, the specific role of calcination time in ball-milled BiCuSeO systems remains insufficiently understood. In this study, the evolution of structural and microstructural characteristics was systematically examined as a function of ball milling duration and calcination time. The results reveal a non-monotonic grain evolution behavior, governed by the interplay between diffusion-driven grain growth and defect-mediated growth inhibition at prolonged calcination durations. Quantitative analysis of crystallite size, microstrain, and grain size distribution establishes a clear correlation between processing parameters and structural perfection. These findings provide new insights into the processing–structure relationship in BiCuSeO and enable the identification of optimized conditions that promote phase purity, improved powder characteristics, and enhanced thermal stability for thermoelectric applications.