Journal of Asian Ceramic Societies (Apr 2019)

High entropy Sr((Zr0.94Y0.06)0.2Sn0.2Ti0.2Hf0.2Mn0.2)O3−x perovskite synthesis by reactive spark plasma sintering

  • Mattia Biesuz,
  • Shuai Fu,
  • Jian Dong,
  • Anna Jiang,
  • Daoyao Ke,
  • Qiang Xu,
  • Degui Zhu,
  • Mauro Bortolotti,
  • Michael J. Reece,
  • Chunfeng Hu,
  • Salvatore Grasso

DOI
https://doi.org/10.1080/21870764.2019.1595931
Journal volume & issue
Vol. 7, no. 2
pp. 127 – 132

Abstract

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A rising interest in entropy-stabilized oxides in recent years has been driven by their attractive functional properties. Their synthesis usually requires prolonged exposure at high temperature to promote solid-state diffusion without the application of pressure. In this work, we report the synthesis of a high entropy perovskite, Sr((Zr0.94Y0.06)0.2Sn0.2Ti0.2Hf0.2Mn0.2)O3−x, in a relatively short time (minutes instead of hours) using a spark plasma sintering (SPS) furnace. Comparative analysis showed that conventional pressureless sintering at 1500°C for 2 h results in porous materials with large thermodynamically stable pores (tens of µm), while SPS processing produces dense materials in a single step by reactive sintering at 1475°C in 9 min. SPS is therefore an attractive route for the production, synthesis and sintering of dense high-entropy oxides.

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