Microstructure and dielectric properties of high entropy Ba(Zr0.2Ti0.2Sn0.2Hf0.2Me0.2)O3 perovskite oxides. Issue 6 (15th April 2020)

• Record Type: Journal Article
• Authors: Zhou, Shiyu; Pu, Yongping; Zhang, Qianwen; Shi, Ruike; Guo, Xu; Wang, Wen; Ji, Jiamin; Wei, Tianchen; Ouyang, Tao
• Is Part Of: Ceramics international. Volume 46:Issue 6(2020)
• Page Start: 7430
• Page End: 7437
• Publication Date: 2020-04-15
• Subjects: High entropy ceramics -- Phase stability -- Grain growth -- Dielectric properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.11.239
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A series of high entropy Ba(Zr0.2 Ti0.2 Sn0.2 Hf0.2 Me0.2 )O3 (Me=Y 3+, Nb 5+, Ta 5+, V 5+, Mo 6+, W 6+ ) perovskite oxides were synthesized by using a solid state reaction method. Three multiple-cation solid solutions formed pure phase compounds, and only two compounds were sintered into ceramics. Microstructure analysis showed the influence of configurational entropy on phase stability and grain growth. Dielectric measurements showed that the high entropy ceramics possessed decent temperature stability of permittivity from 25 °C to 200 °C, low dielectric loss (<0.002) from 20 Hz to 2 MHz, high resistance and moderate breakdown strength (290 kV/cm, 370 kV/cm). Evidence strongly confirmed that controlling configurational entropy could be a feasible perspective to set up highly tunable perovskite structures and explore novel species of dielectric materials.