High-Qf value and temperature stable Zn2+-Mn4+ cooperated modified cordierite-based microwave and millimeter-wave dielectric ceramics.

Cordierite-based dielectric ceramics with a lower dielectric constant would have significant application potential as dielectric resonator and filter materials for future ultra-low-latency 5G/6G millimeter-wave and terahertz communication. In this article, the phase structure, microstructure and microwave dielectric properties of Mg 2 Al 4–2 x (Mn 0.5 Zn 0.5) 2 x Si 5 O 18 (0 ≤ x ≤ 0.3) ceramics are studied by crystal structure refinement, scanning electron microscope (SEM), the theory of complex chemical bonds and infrared reflectance spectrum. Meanwhile, complex double-ions coordinated substitution and two-phase complex methods were used to improve its Q×f value and adjust its temperature coefficient. The Q×f values of Mg 2 Al 4–2 x (Mn 0.5 Zn 0.5) 2 x Si 5 O 18 single-phase ceramics are increased from 45,000 GHz@14.7 GHz (x = 0) to 150,500 GHz@14.5 GHz (x = 0.15) by replacing Al3+ with Zn2+-Mn4+. The positive frequency temperature coefficient additive TiO 2 is used to prepare the temperature stable Mg 2 Al 3.7 (Mn 0.5 Zn 0.5) 0.3 Si 5 O 18 - y wt%TiO 2 composite ceramic. The composite ceramic of Mg 2 Al 3.7 (Mn 0.5 Zn 0.5) 0.3 Si 5 O 18 - y wt%TiO 2 (8.7 wt% ≤ y ≤ 10.6 wt%) presents the near-zero frequency temperature coefficient at 1225 °C sintering temperature: ε r = 5.68, Q×f = 58,040 GHz, τ f = −3.1 ppm/°C (y = 8.7 wt%) and ε r = 5.82, Q×f = 47,020 GHz, τ f = +2.4 ppm/°C (y = 10.6 wt%). These findings demonstrate promising application prospects for 5 G and future microwave and millimeter-wave wireless communication technologies. [ABSTRACT FROM AUTHOR]