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Herein, the influence of Cu 2+  substitution on the phase composition, bulk density, microstructures, and microwave dielectric properties of Li 2 Cu x Zn 1−x SiO 4  (0 ≤ x ≤ 0.06) ceramics prepared by a solid-state reaction were investigated. The results of XRD and mapping showed that Cu 2+  substitution can avoid the influence of secondary phase on the properties of samples. According to the analysis of bulk density, microstructure and microwave dielectric properties, a proper amount of Cu substitution not only improved the sintering characteristics of Li 2 Cu x Zn 1−x SiO 4  ceramics, reduced the densification temperature from 1250 °C to 950 °C, but also increased the  Q×f  value. Furthermore, Cu 2+  substitution also improved the temperature stability of the samples. Particularly, the Li 2 Cu 0.04 Zn 0.96 SiO 4  ceramics sintered at 950 °C for 5 h possessed excellent microwave dielectric properties:  ε r   = 5.624,  Q×f  = 12,764 GHz, and  τ f   = −77 ppm/°C, exhibiting a potential for the low temperature co-fired ceramic applications.

Effects of Cu substitution on microstructures and microwave dielectric properties of Li2ZnSiO4 ceramics

Effects of Cu substitution on microstructures and microwave dielectric properties of Li₂ZnSiO₄ ceramics