Mn-substituted Co2Z ferrite ceramics with impedance matching for ultra-high frequency miniaturization antennas

• Published in: Journal of alloys and compounds 2024-04, Vol.980, p.173552, Article 173552
• Main Authors: Lei, Yida, Liu, Kui, Huo, Xingyu, Yang, Yan, Wang, Xueying, Ma, Yanlin, Yin, Qisheng, Zhang, Huaiwu, Li, Jie
• Format: Article
• Language: English
• Subjects: Miniaturization factor; Permeability; Permittivity; Z-type hexagonal ferrite
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2024.173552

A series of Mn-substituted Z-type hexaferrite ceramics (Ba1.5Sr1.5Co2Fe(23-x)MnxO41; 0.0 ≤ x ≤ 0.5 at a step of 0.1) were prepared via double sintering method. According to EDS data, Mn3+ ions were uniformly distributed throughout the lattice. The relative densities of all samples were higher than 90%, enriching the maxima at x = 0.1 and x = 0.2 (above 95%), which indicated compact grain growth. The greatest saturation magnetization (56.18 emu/g) was achieved at x = 0.1 and then dropped with a further doping of Mn3+ ion, the coercivity showed the opposite trend. Moreover, both permeability and permittivity of the samples drastically changed with the increase of x. Particularly, the samples with x = 0.1–0.2 possessed close permeability (μ′) and permittivity (ε′), and they have relatively high miniaturization factors (nx=0.1 = 12.74, nx=0.2 = 10.38) in the frequency range 10 MHz to 1 GHz. Ba1.5Sr1.5Co2Fe22.9Mn0.1O41 ceramics exhibits best microwave properties, μ′ = 11.26, ε′ = 14.42, magnetic loss tangent tanδμ = 0.048, dielectric loss tangent tanδε = 0.0024, and Snoek constant = 17.433 GHz. Consequently, these Mn-substituted hexaferrite ceramics with impedance matching have great application potential for ultra-high frequency miniaturized antenna substrates. •The high-frequency magnetic-dielectric properties of Mn-substituted Z-type hexaferrite ceramics were systematically investigated.•The relative densities of all samples were higher than 90%, enriching the maxima at x = 0.1 and x = 0.2 (above 95%).•The x=0.1 sample exhibits best microwave properties with μ′ = 11.26, ε′ = 14.42, tanδμ = 0.048, tanδε = 0.0024, and Snoek constant ~ 17.433 GHz.•The miniaturization factors of x = 0.1 and 0.2 samples were greater than 10 (nx=0.1 = 12.72, nx=0.2 = 10.35) in the frequency range 10 MHz to 1 GHz.