Microstructures and microwave dielectric properties of Ba4LiNb3O12–BaWO4 composite ceramics

Temperature-stable and high Q composite ceramics in low-temperature sinterable BaO–V2O5 binary system

“…7, it can be found that the experimentally measured results of e r and s f values are in agreement with the calculated results in terms of the change trend with x. However, a certain deviation between the experimental and the calculated results was clearly observed, which was also found in other works [21][22][23]. This may be due to the following reasons.…”

“…For instance, mixing MgTiO 3 (e r = 17, Q Â f = 160,000 GHz and s f = -50 ppm/°C) and CaTiO 3 (e r = 170, Q Â f = 3600 GHz and s f = 800 ppm/°C) would lead to a compromising combination of dielectric properties (e r = 21, Q Â f = 56,000 GHz and s f = 0 ppm/°C) for 0.95MgTiO 3 -0.05CaTiO 3 [19]. Nevertheless, some novel phenomena such as the Q Â f values of the mixtures were higher than the end phases have appeared in several composite systems, for example, MgAl 2 O 4 -TiO 2 [4], ZnAl 2 O 4 -TiO 2 [20], BaWO 4 -Ba 3 (VO 4 ) 2 [10], Ba 4 LiNb 3 O 12 -BaWO 4 [21]. So far, the mechanism of the enhancement in Q Â f value in these systems is still not distinct because the Q Â f value is usually affected by diverse factors, and it needs to be further studied.…”

Phase evolution and microwave dielectric properties of ceramics with nominal composition Li2x(Zn0.95Co0.05)2−xSiO4 for LTCC applications

“…26 Intrinsic losses are mainly dependent on the crystal structure and are usually caused by the lattice vibration modes. 27 According to the XRD analysis shown in Fig. 2a, tetragonal structure Li 2 ZnSiO 4 (*, PDF #15-0056) was the major phase of the sintered sample when x ¼ 1.…”

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

“…From 0 to 4, the τ f value shifted from -117 to 415 in NaCa 4-x Sr x Nb 5 O 17 [543], while the τ f value changed in the range of (-117)-473 ppm/ for ℃ Na 1-x K x Ca 4 Nb 5 O 17 [544]. [555]. Phase transformation in ℃ the sequence of hexagonal, hexagonal along with cubic, and cubic was observed in Ba 4 LiNb 3-x Sb x O 12 and Ba 4 LiTa 3-x Sb x O 12 system.…”