A new class of high-entropy perovskite oxides

• Published in: Scripta materialia Vol. 142; pp. 116 - 120
• Main Authors: Jiang, Sicong, Hu, Tao, Gild, Joshua, Zhou, Naixie, Nie, Jiuyuan, Qin, Mingde, Harrington, Tyler, Vecchio, Kenneth, Luo, Jian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2018
• Subjects: High-entropy ceramics; Perovskite; Phase stability; Perovskite; High-entropy ceramics; Phase stability
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2017.08.040

A new class of high-entropy perovskite oxides (i.e., multiple-cation solid solutions with high configurational entropies) has been synthesized. Six of the 13 compositions examined, including Sr(Zr0.2Sn0.2Ti0.2Hf0.2Mn0.2)O3, Sr(Zr0.2Sn0.2Ti0.2Hf0.2Nb0.2)O3, Ba(Zr0.2Sn0.2Ti0.2Hf0.2Ce0.2)O3, Ba(Zr0.2Sn0.2Ti0.2Hf0.2Y0.2)O3−x, Ba(Zr0.2Sn0.2Ti0.2Hf0.2Nb0.2)O3 and (Sr0.5Ba0.5)(Zr0.2Sn0.2Ti0.2Hf0.2Nb0.2)O3, can form homogeneous single solid-solution phases. Goldschmidt's tolerance factor, instead of cation-size difference, influences the formation and temperature-stability of single cubic perovskite solid solutions. This new class of multicomponent (high-entropy) perovskite solid solutions with distinct and highly-tunable chemistries can enable simultaneous tailoring of multiple properties and potentially lead to new functionality. The formation of a homogenous solid solution of perovskite Sr(Zr0.2Sn0.2Ti0.2Hf0.2Mn0.2)O3, which is one example of the six high-entropy perovskite oxides synthesized in this study. [Display omitted]