Relationship between crystal structure and dielectric properties of non-stoichiometric Mg2 +xAl4 +ySi5 +zO18-based microwave ceramics

Liu, Fan; Ran, Wen; Li, Hao; Liu, Fei; Liu, Shaojun

doi:10.1007/s10854-022-09500-2

Cited by 2 publications

(1 citation statement)

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“…In this work, considering that Ni/Co doping yields higher Qf values, the authors built on previous research and designed a strategy for (Ni 1– x Co x ) 2+ complex ionic pair doping and modifying the Mg 2+ lattice. The method was to synthesize Mg 1.8 (Ni 1– x Co x ) 0.2 Al 4 Si 5 O 18 (0 ≤ x ≤ 1) ceramics and to deeply elucidate the relationship between the crystal structure and microwave–millimeter-wave dielectric properties using multiple testing methods such as Rietveld refinement of X-ray powder diffraction data, complex chemical bonding theories, Raman spectra, far-infrared spectra, terahertz-domain time spectra, etc. − Finally, the near-zero temperature coefficient of Mg 1.8 Ni 0.1 Co 0.1 Al 4 Si 5 O 18 -8 wt % TiO 2 ceramics was used to fabricate a millimeter-wave antenna, validating the potential application of cordierite materials in radio communication devices.…”

Section: Introductionmentioning

confidence: 99%

Ni–Co Complex Ionic Synergistically Modifying Octahedron Lattice of Cordierite Ceramics for the Application of 5G Microwave–Millimeter-wave Antennas

Yao,

Wang,

Bafrooei

et al. 2024

Inorg. Chem.

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In this work, phase-pure Mg1.8(Ni1–x Co x )0.2Al4Si5O18 (0 ≤ x ≤ 1) ceramics were synthesized by a high-temperature solid-state method. On the basis of Rietveld refinement data of X-ray powder diffraction and Phillips–Vechten–Levine theory, the atomic ionicity, lattice energy, and bond energy of the compound were calculated to explore their influence on the microwave dielectric properties of ceramics. The Mg1.8Ni0.1Co0.1Al4Si5O18 (x = 0.5) ceramic exhibited the best microwave dielectric properties: ε r = 4.44, Qf = 73 539 GHz@13 GHz, and τf = −23.9 ppm/°C. (Ni1–x Co x )2+ complex ionic doping, compared with only Ni2+ or Co2+, is beneficial for improving the symmetry of [Si4Al2O18] hexagonal rings and reducing distortion. Subsequently, 8 wt % TiO2 was added to Mg1.8Ni0.1Co0.1Al4Si5O18, resulting in a near-zero τ f and high Qf values for the composite ceramic, with ε r = 5.22, Qf = 58 449 GHz@13 GHz, and τf = −2.06 ppm/°C. Finally, a 5G millimeter-wave antenna with a central operating frequency of 25.52 GHz was designed and fabricated using the Mg1.8Ni0.1Co0.1Al4Si5O18-8 wt % TiO2 ceramics. Operating in the 24.7–26.0 GHz range, it demonstrated favorable radiation characteristics with a simulated efficiency of 85.2% and a gain of 4.58 dBi. The antenna’s performance confirms the high potential of the cordierite composite for application in 5G communication systems.

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