Dielectric properties of (Y0.2Eu0.2Er0.2Dy0.2Lu0.2)3(AlxFe1-x)5O12 high-entropy garnet ceramics |
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| Affiliation: | 1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110189, China;2. College of Metallurgy and Energy, North China of Science and Technology, Tangshan, 063210, China;3. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China |
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| Abstract: | A new kind of novel high-entropy rare earth garnet ceramics (HEREGCs, (Y0.2Eu0.2Er0.2Dy0.2Lu0.2)3(AlxFe1-x)5O12 (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. |
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| Keywords: | High-entropy rare earth garnet Colossal dielectric Grain boundary electrical conductivity Grain electrical conductivity |
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