Synthesis, characterization, and microwave dielectric properties of ternary-phase ixiolite-structure MgTiNb2O8 ceramics

Mei, Q.J.; Li, C.Y.; Guo, Jingdong; Wu, Haitao

doi:10.1016/j.matlet.2015.01.057

Cited by 20 publications

(6 citation statements)

References 13 publications

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“…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.…”

Section: Resultssupporting

confidence: 87%

“…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).…”

Section: Introductionmentioning

confidence: 99%

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

Kumada

Nakanome

Yanagida

et al. 2018

Journal of Asian Ceramic Societies

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Four types of oxides, ATiM 2 O 8 (A: Mg, Zn; M: Nb, Ta) were prepared by high-temperature solid-state reaction. MgTiNb 2 O 8 , ZnTiNb 2 O 8 and ATiTa 2 O 8 had rutile-type, α-PbO 2-type and trirutile-type structures, respectively. The crystal structures of these compounds were refined based on the synchrotron X-ray powder diffraction data with the following R-factors: R wp = 4.34% and R p = 2.21% for MgTiNb 2 O 8 ; R wp = 2.19% and R p = 1.52% for ZnTiNb 2 O 8 ; R wp = 9.03% and R p = 6.31% for MgTiTa 2 O 8 ; and R wp = 5.70% and R p = 4.16% for ZnTiTa 2 O 8. Their lattice parameters were a = 4.69585(8) and c = 3.04260(6) Å for MgTiNb 2 O 8 ; a = 4.67138 (6), b = 5.65916(7) and c = 5.00745(6) Å for ZnTiNb 2 O 8 ; a = 4.6876(2) and c = 9.1385(3) Å for MgTiNb 2 O 8 ; and a = 4.6987(7) and c = 9.1296(1) Å for ZnTiTa 2 O 8. The optical band gap for these compounds ranged from 2.98 to 3.15 eV and every compound exhibited a small amount of photocatalytic activity for phenol decomposition under UV light irradiation. However, no photocatalytic activity was observed under visible light irradiation. The dielectric constants for these compounds were between 25 and 125 at a temperature range of room temperature to 400°C.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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

Kumada

Nakanome

Yanagida

et al. 2018

Journal of Asian Ceramic Societies

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“…(The size of the spheres in the diagram represents the value of the dielectric constant; the larger the sphere, the higher the dielectric constant of the dielectric ceramic. ) 4,19–20,33,41,54–85 …”

Section: Resultsmentioning

confidence: 99%

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

et al. 2022

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Tri-layered structural Zn 0.997 Cu 0.003 ZrNb 2 O 8 -TiO 2 +ZnO/TiO 2 +CuO/TiO 2 -Zn 0.997 Cu 0.003 ZrNb 2 O 8 ceramics with different mass fractions of TiO 2 +ZnO/TiO 2 +CuO/TiO 2 were successfully prepared. The advantages of the multilayered design were completely demonstrated, and the microwave dielectric characteristics were modified by the components of each dielectric layer. In comparison to the random distribution-type, Zn 0.997 Cu 0.003 ZrNb 2 O 8 @TiO 2 +ZnO, this tri-layered construction could increase the Q × f value by approximately 100%. Meanwhile, based on the electronic compensation mechanisms, the Q × f value of the tri-layered structural ceramics with TiO 2 -doped interlayer can be increased by nearly 20% compared with that of the pure TiO 2 interlayer. The Zn 0.997 Cu 0.003 ZrNb 2 O 8 -TiO 2 +ZnO-Zn 0.997 Cu 0.003 ZrNb 2 O 8 tri-layered ceramic exhibited excellent dielectric characteristics (𝜀 𝑟 = 33.75, Q × f = 59 000 GHz, and 𝜏 𝑓 = +2.27 ppm/ • C) with 0.05 wt% TiO 2 +ZnO sintered at 1240 • C for 6 h, and the integrated optimization of microwave dielectric characteristics was achieved. This article provides a strategy for the synthesis of high-performance microwave dielectric components for application in 5G/6G wireless communication technologies.

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“…Subsequently, many relevant researches were reported because different cations can be substituted to synthesize materials with different characteristics. For example, Mei et al 7 . reported excellent microwave properties of MgTiNb 2 O 8 ceramics sintered at 1000°C with ε r = 33.8, Q × f = 26 260 GHz, and τ f = −19.2 ppm/°C.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and microwave dielectric properties of temperature stable (Co_xZn_1–_x)TiNb₂O₈ ceramics

et al. 2023

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Co x Zn 1-x )TiNb 2 O 8 (x = 0.2-0.8) microwave dielectric ceramics were synthesized via the conventional solid-state reaction route, and the correlation of microwave dielectric properties on the crystal structure was discussed. Crystal structures of ceramic samples were systematically investigated by X-ray powder diffraction. Moreover, composition-induced phase transitions were confirmed via the following sequence: for x ≤ 0.2, single-phase orthorhombic ixiolite (ZnTiNb 2 O 8 ) was formed, whereas for 0.3 ≤ x<0.8, ixiolite and rutile coexisted.When x ≥ 0.8, only single-phase rutile was detected. For the (Co x Zn 1-x )TiNb 2 O 8 ceramics, the microwave dielectric properties were changed with the crystal structural transitions: the dielectric constant (ε r ) and the temperature coefficient of resonant frequency (τ f ) increased upon increasing the Co 2+ , but the quality factor (Q) decreased. A near-zero τ f = +1.6 ppm/ • C was obtained in the Co 0.38 Zn 0.62 TiNb 2 O 8 ceramics with ε r = 40.7 and high Q × f = 16 790 GHz. These research outcomes are expected to have great significance for developing microwave dielectric ceramics in practical applications.

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Synthesis, characterization, and microwave dielectric properties of ternary-phase ixiolite-structure MgTiNb2O8 ceramics

Cited by 20 publications

References 13 publications

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

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

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

Crystal structure and microwave dielectric properties of temperature stable (Co_xZn_1–_x)TiNb₂O₈ ceramics

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Synthesis, characterization, and microwave dielectric properties of ternary-phase ixiolite-structure MgTiNb2O8 ceramics

Cited by 20 publications

References 13 publications

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

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

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

Crystal structure and microwave dielectric properties of temperature stable (CoxZn1–x)TiNb2O8 ceramics

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

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

Crystal structure and microwave dielectric properties of temperature stable (Co_xZn_1–_x)TiNb₂O₈ ceramics