Microwave Dielectric Properties of Zn_0.95Mg_0.05TiO₃+ 0.25TiO₂Ceramics with 3ZnO–B₂O₃Addition

Microwave dielectric properties and microstructures of Nb2O5-Zn0.95Mg0.05TiO3+0.25TiO2 ceramics with Bi2O3 addition

“…6,8 Fig . 1 shows the XRD results for Nb-ZMT with 5 wt.% Bi 2 O 3 addition sintered at temperatures ranging from 900 to 1000 • C. It is interesting to note that no cubic Zn 2 TiO 4 phase is present in the Nb-ZMT ceramic with 5 wt.% Bi 2 O 3 addition, even at a temperature as high as 960 • C. This is contradicted by the phase diagram, which indicates that the ZnTiO 3 ceramic would decompose at 945 • C. This result is the same as previous study, 11 Bi 2 O 3 addition can be inhibited Zn 2 TiO 4 formation in ZMT ceramics at sintered temperatures of up to 960 • C. Also from our previous study, 13 it is known that the Zn 2 TiO 4 phase was formed in ZMT ceramics with 1 wt.% 3ZnO-B 2 O 3 addition sintered at 920 • C. In other words, it can be concluded that the addition of Bi 2 O 3 can suppress the formation of the Zn 2 TiO 4 phase in the Nb-ZMT ceramics. Fig.…”

Low Temperature Cofired Ceramics

“…Mg is smaller (0.66 Å ) than Zn (0.74 Å ). Hence Zn 1-x Mg x TiO 3 solid solution phases were prepared with a view of improving the properties [256][257][258]. The thermal stability and unit cell parameters of the hexagonal phase varied with Mg content of the system [256].…”

“…The presence of rutile is advantageous since ZnTiO 3 has negative f . Lee et al [257] studied the effect of addition of zinc borate to Zn 0.95 Mg 0.05 TiO 3 þ 0.25TiO 2 in the temperature range 860-940°C. It was found that addition of about 1 wt% zinc borate significantly improved the density and microwave dielectric properties.…”

Low-Temperature Sintering and Microwave Dielectric Properties of Zn2SiO4 Ceramic Added with Crystalline Zinc Borate

“…Zinc borate has been used as sintering aid in all its forms, e.g. by mixing raw oxides (ZnO, B 2 O 3 ) with the high-temperature sintering dielectric material, as a glassy additive, 16 and in its calcined, crystalline forms, for example 4ZnO-B 2 O 3 17 or Zn 4 B 6 O 13 . Zinc borate-based sintering is reported to help reduce the sintering temperature without degrading the dielectric properties of the material.…”