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

• Published in: Journal of Asian Ceramic Societies Vol. 7; no. 2; pp. 127 - 132
• Main Authors: Biesuz, Mattia, Fu, Shuai, Dong, Jian, Jiang, Anna, Ke, Daoyao, Xu, Qiang, Zhu, Degui, Bortolotti, Mauro, Reece, Michael J., Hu, Chunfeng, Grasso, Salvatore
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 03.04.2019; Taylor & Francis Group
• Subjects: entropy-stabilized oxides; High entropy; perovskite; reactive SPS; SPS
• ISSN: 2187-0764
• DOI: 10.1080/21870764.2019.1595931

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((Zr 0.94 Y 0.06 ) 0.2 Sn 0.2 Ti 0.2 Hf 0.2 Mn 0.2 )O 3− 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.