High Q Microwave Dielectric Ceramics in the Li2(Zn1−xAx)Ti3O8
(A = Mg, Co; x = 0.02–0.1) System
Using a conventional solid‐state reaction, followed by sintering at 1080°C–1200°C Li2(Zn1−x
(A = Mg, Co and x = 0.02–0.1) ceramic system with >96% density were prepared. The XRD patterns of the sintered samples revealed single‐phase formation with
a cubic crystal symmetry. The molecular volume shows good linear relationship with x value. The microwave dielectric properties of Li2(Zn1−x
ceramics exhibited a significant dependence on the x value and to some extent on the morphology of the specimens. The Li2(Zn0.94Mg0.06)Ti3O8 ceramics possess ε
r = 26.1,
Q × f = 150 000 GHz, and τ
= −13.9 ppm/°C, and Li2(Zn0.92Co0.08)Ti3O8 ceramics show ε
r = 24.7,
Q × f = 140 000 GHz, and τ
= −13.4 ppm/°C, respectively. It indicates a substantial increase in the Q × f in comparison with that of pure Li2ZnTi3O8.
The microwave dielectric properties of these partially substituted ceramics are reported for the first time.