Cobalt-modified Mg0.95Zn0.05TiO3 ceramics with improved dielectric properties for microwave applications

In pursuit of high-performance and energy-efficient dielectric ceramics for next-generation wireless communication systems, this work examines the effect of Co2+ substitution for Mg2+ on the microstructure and microwave dielectric properties of (Mgo.95Zno.o5)TiO3 ceramics. A series of [(Mgi_xCox)o.95Zno.o5]TiO3 compositions (r = 0.1-0.4) was synthesized via solid-state reaction and characterized by synchrotron XRD, Raman spectroscopy, SEM, and dielectric measurements. The optimal composition, [(Mgo.8Coo.2)o.95Zno.o5]TiO3, sintered at 135O C for 2 h, achieved r = 18.42, Qf = 19O,OOO GHz, and Tf = -51 ppm/C, representing a 16.2% Qf enhancement and a 43.7% reduction in overall thermal budget compared with literature benchmarks. These results are attributed to improved densification, increased lattice polarizability, and a stable phase composition. The findings demonstrate a viable route toward low-loss, energy-efficient microwave ceramics suitable for 5G and future communication devices.