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
Abstract A series of nominal compositions MgAl(LiTi)O (, 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(LiTi)O ceramics with a spinel structure was obtained at , whereas the second phase of MgTiO appeared when . The cell parameters were obtained by XRD refinement. As the values increased, the unit cell volume kept expanding. This phenomenon could be attributed to the partial substitution of (LiTi) for Al. Results showed that (LiTi) doping into MgAlO spinel ceramics effectively reduced the sintering temperature and improved the quality factor () values. Good microwave dielectric properties were achieved for a sample at sintering at 1500 C in air for 4 h: dielectric constant , temperature coefficient of resonant frequency ppm/C, and GHz. The value of the sample was about 2 times higher than that of pure MgAlO ceramics (31600 GHz). Thus, MgAl(LiTi)O ceramics with excellent microwave dielectric properties can be applied to 5G communications.
(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
Fund: Project supported by the Chengdu University of Technology (Grant No. KYQD2019 07728).
Corresponding Authors:
Yuanming Lai
E-mail: laiyuanming19@cdut.edu.cn
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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