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Improved microwave dielectric properties of MgAl2O4 spinel ceramics through (Li1/3Ti2/3)3+ doping |
| Xiao Li(李潇)1, Xizhi Yang(杨习志)1, Yuanming Lai(赖元明)1,†, Qin Zhang(张芹)2, Baoyang Li(李宝阳)1, Cong Qi(戚聪)1, Jun Yin(殷俊)1, Fanshuo Wang(王凡硕)1, Chongsheng Wu(巫崇胜)1, and Hua Su(苏桦)2 |
1 School of Mechanical and Electrical Engineering, Chengdu University of Technology, Chengdu 610059, China;
2 State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract A series of nominal compositions MgAl$_{2-x}$(Li$_{1/3}$Ti$_{2/3}$)$_{x}$O$_{4}$ ($x = 0$, 0.04, 0.08, 0.12, 0.16, and 0.20) ceramics were successfully prepared via the conventional solid-state reaction route. The phase compositions, microstructures, and microwave dielectric properties were investigated. The results of x-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that a single phase of MgAl$_{2-x}$(Li$_{1/3}$Ti$_{2/3}$)$_{x}$O$_{4}$ ceramics with a spinel structure was obtained at $x \le 0.12$, whereas the second phase of MgTi$_{2}$O$_{5}$ appeared when $x > 0.12$. The cell parameters were obtained by XRD refinement. As the $x$ values increased, the unit cell volume kept expanding. This phenomenon could be attributed to the partial substitution of (Li$_{1/3}$Ti$_{2/3}$)$^{3+}$ for Al$^{3+}$. Results showed that (Li$_{1/3}$Ti$_{2/3}$)$^{3+}$ doping into MgAl$_{2}$O$_{4}$ spinel ceramics effectively reduced the sintering temperature and improved the quality factor ($Q_{\rm f}$) values. Good microwave dielectric properties were achieved for a sample at $x = 0.20$ sintering at 1500 ${^\circ}$C in air for 4 h: dielectric constant $\varepsilon_{\rm r} =8.78$, temperature coefficient of resonant frequency $\tau_{\rm f} = -85 $ ppm/${^\circ}$C, and ${Q_{\rm f}} = 62 300 $ GHz. The $Q_{\rm f}$ value of the $x = 0.20$ sample was about 2 times higher than that of pure MgAl$_{2}$O$_{4}$ ceramics (31600 GHz). Thus, MgAl$_{2-x}$(Li$_{1/3}$Ti$_{2/3}$)$_{x}$O$_{4}$ ceramics with excellent microwave dielectric properties can be applied to 5G communications.
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Received: 02 June 2022
Revised: 12 July 2022
Accepted manuscript online: 18 July 2022
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PACS:
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77.22.-d
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(Dielectric properties of solids and liquids)
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77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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| Fund: Project supported by the Chengdu University of Technology (Grant No. KYQD2019 07728). |
Corresponding Authors:
Yuanming Lai
E-mail: laiyuanming19@cdut.edu.cn
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Cite this article:
Xiao Li(李潇), Xizhi Yang(杨习志), Yuanming Lai(赖元明), Qin Zhang(张芹), Baoyang Li(李宝阳),Cong Qi(戚聪), Jun Yin(殷俊), Fanshuo Wang(王凡硕), Chongsheng Wu(巫崇胜), and Hua Su(苏桦) Improved microwave dielectric properties of MgAl2O4 spinel ceramics through (Li1/3Ti2/3)3+ doping 2023 Chin. Phys. B 32 057701
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