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• W4285727992 endingPage "057701" @default.
• W4285727992 startingPage "057701" @default.
• W4285727992 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 ≤ 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 f ) values. Good microwave dielectric properties were achieved for a sample at x = 0.20 sintering at 1500 °C in air for 4 h: dielectric constant ε r = 8.78, temperature coefficient of resonant frequency τ f = −85 ppm/°C, and Q f = 62 300 GHz. The Q 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." @default.
• W4285727992 created "2022-07-18" @default.
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• W4285727992 date "2023-05-01" @default.
• W4285727992 modified "2023-09-29" @default.
• W4285727992 title "Improved microwave dielectric properties of MgAl₂O₄ spinel ceramics through (Li_1/3Ti_2/3)³⁺ doping" @default.
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• W4285727992 doi "https://doi.org/10.1088/1674-1056/ac81a8" @default.
• W4285727992 hasPublicationYear "2023" @default.
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