Synthesis, characterization, and microwave dielectric properties of ZnTiTa2O8 ceramics with ixiolite structure obtained through the aqueous sol–gel process

Crystal structure, photocatalytic and dielectric property of ATiM2O8 (A: Mg, Zn; M: Nb, Ta)

“…Figure 7 shows the temperature dependence of the dielectric constants and tanδ for ATiM 2 O 8 (A: Mg, Zn; M: Nb, Ta). The dielectric constants for ATiM 2 O 8 (A: Mg, Zn; M: Nb, Ta) were 25~50 and these values were compatible with the published values [15][16][17]. Accordingly, the temperature dependence of dielectric constant for ZnTiNb 2 O 8 shows a weak peak at around 350°C.…”

“…On the other hand, the solid solution systems M 2+ /Ti 4+ /M 5+ /O (M 2+ : Mg, Zn; M 5+ : Nb, Ta), where the transitionmetals were substituted with either magnesium or zinc atom, had been reported to have four types of crystal structures as follows: Mg 0.167 Nb 0.333 Ti 0.5 O 2 with a rutile-type structure [7], (Mg 0.857 Ti 0.143 ) (Nb 0.857 Ti 0.143 ) 2 O 6 , with a columbite-type structure [8], ZnTiNb 2 O 8 with the α-PbO 2 -type structure [9], (Zn 0.15 Nb 0.3 Ti 0.55 )O 2 with a rutile-type structure [10] and Zn/Ti/Ta/O system with a spinel-type structure [11,12]. The dielectric behaviors of ATiM 2 O 8 (A: Mg, Zn; M: Nb, Ta) were reported to be a candidate for a microwave capacitor and sol-gel process or a sintering additive for these compounds was attempted to improve their property [13][14][15][16][17]. However, to the best of our knowledge, there has been no reported investigation on the photocatalytic property for ATiM 2 O 8 (A: Mg, Zn; M: Nb, Ta).…”

ZrO2-doped Zn0.5Ti0.5TaO4 microwave dielectric ceramics with low dielectric loss and excellent temperature stability

“…Of these, Park et al prepared Zn0.5Ti0.5TaO4 ceramics with a tri-rutile structure displaying excellent dielectric properties (εr = 47.1, Q × f = 35,800 GHz, τf = 84 ppm/°C) using a solid-phase reaction method [3] . Wu et al prepared nanocrystalline powders by sol-gel method and synthesized Zn0.5Ti0.5TaO4 ceramics with ixiolite as the main crystalline phase after sintering, which exhibited better dielectric properties with εr = 35.7, Q × f = 57,550 GHz, τf = -24.7 ppm/°C [4] . It can be found that Zn0.5Ti0.5TaO4 ceramics with a tri-rutile crystal structure have positive τf values, while Zn0.5Ti0.5TaO4 ceramics with an ixiolite crystal structure have negative τf values.…”

Effect of (Ca0.8Sr0.2)0.6La0.267TiO3 on Phase, Microstructure, and Microwave Dielectric Properties of Mg0.95Zn0.05TiO3 Synthesized by Polymeric Precursor Method

“…14,15 The polymeric precursor route is simple and can be employed to produce nanosized multicomponent ceramics. 3,16,17 This method consists of formation of a polymeric complex starting from a polyhydroxy alcohol and an alpha-hydroxycarboxylic acid, with metallic cations homogeneously distributed throughout the matrix. The advantage of the polymeric precursor method is reduced segregation of different metal ions in the metal-chelate complexes.…”