Dielectric properties of (Y0.2Eu0.2Er0.2Dy0.2Lu0.2)3(AlxFe1-x)5O12 high-entropy garnet ceramics. Issue 5 (1st March 2023)

• Record Type: Journal Article
• Authors: Liu, Haowen; Bao, Ateer; Zhang, Jun; Gu, Yaohang; Zhang, Xiaoyan; Qi, Xiwei
• Is Part Of: Ceramics international. Volume 49:Issue 5(2023)
• Page Start: 7208
• Page End: 7213
• Publication Date: 2023-03-01
• Subjects: High-entropy rare earth garnet -- Colossal dielectric -- Grain boundary electrical conductivity -- Grain electrical conductivity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.04.318
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A new kind of novel high-entropy rare earth garnet ceramics (HEREGCs, (Y0.2 Eu0.2 Er0.2 Dy0.2 Lu0.2 )3 (Alx Fe1-x )5 O12 (x = 0.4–0.6)) was designed and successfully synthesized by solid state reaction method. With the increase of Al content, the relative dielectric constant (εr ′) at 100 Hz decreases from 4 × 104 to 1 × 102, while the dielectric loss (tanδ) increases from 0.93 to 2.65. The activation energy of grain boundary electrical conductivity (Egb ) and grain electrical conductivity (Eg ) are fitted according to Arrhenius' law, which indicate that the increase of difference between Egb and Eg lead to the enhancement of dielectric properties. Our results provide the underlying insights needed to guide the study of colossal dielectric materials.