Sintering characteristics and microwave dielectric properties of low loss ZnZrNb2O8 ceramics achieved by reaction sintering process

Enhanced high dielectric characteristics tri‐layered structural ceramics for 5G/6G communications

“…Combining the results of Raman spectroscopy and Figure S3h, the thicknesses of the ZCZN (TZO), TZO, and TZO (ZCZN) layers are represents the value of the dielectric constant; the larger the sphere, the higher the dielectric constant of the dielectric ceramic.) 4,[19][20]33,41, shown in Figure 7. The variation tendencies of microwave dielectric characteristics for ZCZN@TZO/TCO/TO ceramics with random distribution are similar to those of the ZCZN-TZO/TCO/TO-ZCZN ceramics with trilayered structure.…”

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

“…5, and the related investigations of each structure are illustrated in this section. The effects of different cations (Mn, Zn, Mg, Ni, and Co) at A-site of AZrNb 2 O 8 illustrated that dielectric constant, quality factor, and τ f values relied on the ionic polarizability, packing fraction, and B-site octahedral distortions, respectively [80][81][82][83][84][85]. Among them, MgZrNb 2 O 8 shows the optimal quality factor www.springer.com/journal/40145 (ε r ≈ 26, Q×f value ≈ 120,816 GHz, and τ f ≈ -50.2 ppm/ , ℃ at f = 6.85 GHz [86]).…”

Trace additive enhances microwave dielectric performance significantly to facilitate 5G communications

“…[1][2][3] In recent years, due to the low dielectric loss at microwave frequencies, a novel family of AZrNb 2 O 8 (A: Zn, Mg, Co, and Mn) materials with monoclinic wolframite crystal structure and P2/c space group have received a lot of interest. Liao et al 4 first synthetized ZnZrNb 2 O 8 ceramics through solid-state reaction, and the microwave performances of specimens sintered at 1250 • C were 𝜀 𝑟 = 30, Q × f = 61 000 GHz, and 𝜏 𝑓 = −52 ppm/ • C. Then, ZnZrNb 2 O 8 ceramics, prepared by a reaction sintering method, were reported by Wu et al 5 with 𝜀 𝑟 = 28.37, Q × f = 63 300 GHz, and 𝜏 𝑓 = −19.9 ppm/ • C. Wu et al 6 synthetized ZnZrNb 2 O 8 ceramics through aqueous solgel process and achieved the microwave performance of 𝜀 𝑟 = 27.38, Q × f = 66 700 GHz, 𝜏 𝑓 = −38.4 ppm/ • C at 1200 • C. In order to enhance the temperature stability of resonant frequency, ZnZrNb 2 O 8 -TiO 2 ceramic systems were also investigated. Near-zero 𝜏 𝑓 (−2.4 ppm/ • C) could be achieved with 𝜀 𝑟 = 41.4, Q × f = 38 500 GHz for the 0.3ZnZrNb 2 O 8 -0.7TiO 2 specimen.…”

“…first synthetized ZnZrNb 2 O 8 ceramics through solid‐state reaction, and the microwave performances of specimens sintered at 1250°C were $${\varepsilon _r}$$ = 30, Q $$ \times \;$$ f = 61 000 GHz, and $${\tau _f}$$ = −52 ppm/°C. Then, ZnZrNb 2 O 8 ceramics, prepared by a reaction sintering method, were reported by Wu et al 5 . with $${\varepsilon _r}$$ = 28.37, Q $$ \times \;$$ f = 63 300 GHz, and $${\tau _f}$$ = −19.9 ppm/°C.…”