期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 44, 期 1, 页码 284-292出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2023.09.017
关键词
High-entropy ceramics; Phase evolution; Microwave dielectric properties; Single phase; Spinel structure
“In this study, high-entropy spinel-type ceramics were synthesized and their microwave dielectric properties were investigated. The high-entropy ceramics exhibited good dielectric performance, which was influenced by factors such as sintering temperature, lattice distortion, and grain size.”
In this study, high-entropy spinel-type (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics were synthesized by solid-state reaction method. The raw materials gradually formed spinel aluminates from 700 to 1400 degrees C and finally formed high-entropy (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics after calcination at 1400 degrees C for 4 h. The high-configuration entropy and low average atomic-size difference were beneficial to form single-phase high-entropy ceramics. Partial lattice distortion occurred within the high-entropy (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics structure, and its grain size gradually increased with increasing sintering temperature. The high-entropy (Mg0.2Co0.2Ni0.2Li0.4Zn0.2)Al2O4 ceramics exhibited good microwave dielectric properties when sintered at 1550 degrees C for 4 h: dielectric constant (epsilon r) = 7.4, quality factor (Qf) = 58,200 GHz, and temperature coefficient of resonance frequency (wf) = -64 ppm/degrees C. The epsilon r values were mainly affected by the dielectric polarizability. The Qf values were highly related to the relative density and covalency of A-site bond, whereas the wf values closely depended on the bond strength of A-site.
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