Microwave dielectric properties of high-entropy [(Mg1/2Zn1/2)0.4+x(Ni1/3Co1/3Mn1/3)0.6-x]2TiO4 ceramics

被引:0
作者
Xiang, Pingwen [1 ]
Lai, Yuanming [1 ]
Zhang, Linqiao [1 ]
Liu, Feng [1 ]
Li, Yuanxun [2 ]
Han, Jiao [3 ]
Zeng, Yiming [3 ]
Liu, Qian [1 ]
Wu, Chongsheng [1 ]
机构
[1] Chengdu Univ Technol, Sch Mech & Elect Engn, Chengdu 610059, Peoples R China
[2] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Device, Chengdu 610054, Peoples R China
[3] Yunnan Precious Met Lab Co Ltd, Kunming 650106, Peoples R China
关键词
High-entropy ceramics; Inverse spinel structure; Microwave dielectric properties; CRYSTAL-STRUCTURE; ELECTRICAL-PROPERTIES; MG2TIO4; CERAMICS; SOLID-SOLUTIONS; BOND VALENCE; DEPENDENCE;
D O I
10.1016/j.jallcom.2024.177833
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, a series of high-entropy [(Mg 1/2 Zn 1/2 ) 0.4+ x (Ni 1/3 Co 1/3 Mn 1/3 ) 0.6- x ] 2 TiO 4 (expressed as MZNCMT) (0.0 <= x <= 0.6) ceramics were prepared via the solid-state reaction, the high-entropy ceramics exhibited inverse spinel structure. The phase compositions, microstructures, and microwave dielectric properties were investigated. The results of x-ray diffraction (XRD) showed that a principal phase of [(Mg 1/2 Zn 1/2 ) 0.4+ x (Ni 1/3 Co 1/3 Mn 1/ 3)0.6-x]2TiO4 ceramics, whereas the second phase of (Mg, Zn, Ni, Co, Mn)TiO3 appeared when x <= 0.4. With the increase of x value, the relative density of the sample decreased, the unit cell volume first decreased and then kept expanding. This phenomenon could be attributed to the reduction of (Ni 1/3 Co 1/3 Mn 1/3 ) 2 + . Good microwave dielectric properties were achieved: x = 0.0 (epsilon r = 17.17, Qf = 16500 GHz, zf = -33 ppm/degrees C), x = 0.5 (epsilon r = 16.30, Qf = 53900 GHz, zf = -30 ppm/degrees C) and x = 0.6 (epsilon r = 16.26, Qf =110800 GHz, zf = -39 ppm/degrees C). The epsilon r value of MZNCMT ceramics is consistent with the theoretical dielectric constant (epsilon theo), indicating that epsilon r is mainly based on ion polarization. The Qf value were highly related to the packing fraction. Furthermore, the zf value depended on the bond strength of A-site.
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页数:8
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