Microwave dielectric characteristics of Li2(Mg0.94M0.06)Ti3O8 (M=Zn, Co, and Mn) ceramics

Abstract Li 2 (Mg 0.94 M 0.06 )Ti 3 O 8 (M=Zn, Co, and Mn) ceramics were synthesized by the conventional solid-state reaction route. The effect of M (Zn, Co, and Mn) substitution on the structure, microstructure and microwave dielectric properties of Li 2 (Mg 0.94 M 0.06 )Ti 3 O 8 has been investigated. The XRD patterns of sintered samples revealed the single-phase formation with spinel structure. With the increase in ionic radius of M, the Qf value decrease is attributed to the decrease of packing fraction and grain size. The Li 2 (Mg 0.94 Zn 0.06 )Ti 3 O 8 ceramic sintered at 1075 °C for 4 h showed the best microwave dielectric properties with a dielectric constant of 27.1, a Qf value of 44 800 GHz, and a temperature coefficient of resonant frequency of (+)1.9 ppm/°C.