Qingwei Liao

Effect of Co2O3 Additive on the Microstructures and Dielectric Properties of MgTiO3 Ceramics

(Mg 1 − x Cox)TiO 3 (x = 0, 0.03, 0.05, 0.1, 0.2) were synthesized by the solid-state reaction method. The effect of Co 2 O 3 additive on the microstructures, the phase formation and the microwave dielectric properties of MgTiO 3 ceramics was investigated. The microwave dielectric properties of the (Mg 1 − x Co x)TiO 3 ceramics system were found to vary with amount of Co 2 O 3 additive and sintering temperature which were attributed to the variation of second phase and densification of the ceramics. By properly adjusting the amount of Co 2 O 3 , a small dielectric loss of 0.2 × 10−4 was obtained for (Mg 1 − x Co x )TiO 3 ceramics.

Dielectric Properties and Quantitative Phase Analysis of the Sn-Doped ZnO-TiO2-Nb2O5 Ceramics

The microwave dielectric properties and crystal structure of the ZnO-xSnO 2 -(2–x)TiO 2 -Nb 2 O 5 ceramics were investigated. There were two phases existing in the ceramics: ixiolite phase ZnTiNb 2 O 8 and rutile phase Zn 0.15 Nb 0.30 Ti 0.55 O 2 . The mass percentage of phase ZnTiNb 2 O 8 increased with increasing of SnO 2 content from 0.02 to 0.08, and when x ≥ 0.08 the mass percentage of phase ZnTiNb 2 O 8 decreased. For the dielectric constant and dielectric loss of the ceramics, these values ranged from 49 to 63 and from 2.4× 10− 4 to 0.30× 10− 4, respectively. The temperature coefficient of the ceramics decreased from −132 × 10− 6/°C to −12 × 10− 6/°C.