SHIH-HUNG LIN2026-10-162026-10-162026-01-01Pure ID: 15176170Pure UUID: 9d588ee4-7418-4381-9dda-d0b74dfd6c8910.36410/jcpr.2026.27.1.37https://www.scopus.com/pages/publications/105036556557https://scholars.csmu.edu.tw/handle/123456789/25498In 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.11enjournal article