The structure and properties of 0.95MgTiO3–0.05CaTiO3 ceramics co-doped with ZnO–ZrO2

Xiaojing, Yang; Liu, Xiaobing; Bo, Yu; Yang, Xianfeng; Song, Tian‐shun

doi:10.1016/j.ceramint.2011.04.050

Cited by 13 publications

(6 citation statements)

References 12 publications

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“…Each cation forms an octahedron with six oxygen ions and is arranged in an orderly fashion. At the same time, LMTO can significantly reduce the device's mass because its density (∼3.45 g/cm 3 ) is lower than that of commercial K20 MWDCs (0.95MgTiO 3 –0.05CaTiO 3 , 3.7 g/cm 3 ) 24,25 . Dielectric properties of LMTO ceramics reported in recent years, as well as the dielectric properties following modification, are shown in Figure 1B 23,26–35 .…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, LMTO can significantly reduce the device's mass because its density (∼3.45 g/cm 3 ) is lower than that of commercial K20 MWDCs (0.95MgTiO 3 -0.05CaTiO 3 , 3.7 g/cm 3 ). 24,25 Dielectric properties of LMTO ceramics reported in recent years, as well as the dielectric properties following modification, are shown in Figure 1B. 23,[26][27][28][29][30][31][32][33][34][35] Overall, researchers have worked on improving preparation process or using ionic substitution to optimize dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of excess lithium on the structure and microwave dielectric properties of LiMg_0.5Ti_0.5O₂ ceramics

et al. 2023

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Herein, Li1+xMg0.5Ti0.5O2 (0.000 ≤ x ≤ 0.075) ceramics with excess lithium were prepared by solid‐state reaction method to compensate for lithium volatilization, thus optimizing dielectric properties. The second phase Mg2TiO4 decreases with excess lithium content and eventually disappears at x = 0.05. Of these, Li1.0375Mg0.5Ti0.5O2 illustrates the best dielectric properties with εr = 16.58, Q × f = 120712 GHz (@9.18 GHz), and τf = −16.31 ppm/°C. From the point of view of non‐intrinsic factors, excess lithium at optimum ratios slightly facilitates the sintering of the ceramics, improves densification, and increases the grain size, resulting in improved dielectric properties. For intrinsic factors, a slight increase in bond ionicity results in a slight improvement in εr. First‐principles calculations demonstrate that suitable excess lithium increases electron cloud density in the internal space of Li/Mg/TiO6 octahedron and increases band gap, thus optimizing the dielectric properties. The same results were obtained from the perspective of lattice vibrations. The modified Li1.0375Mg0.5Ti0.5O2 ceramics offer great potential for future microwave communication technology.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of excess lithium on the structure and microwave dielectric properties of LiMg_0.5Ti_0.5O₂ ceramics

et al. 2023

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“…4,5 Therefore, to enable microwave electronic equipment to benefit from the advantages of miniaturization, such as excellent stability, portability, and high level of integration, ceramics with low dielectric loss, high dielectric constant, and near-zero resonant-frequency temperature coefficient have become increasingly attractive. [6][7][8] K20 microwave dielectric ceramics, such as 95MCT, Li 2 TiO 3 , and LnNbO 4 (Table 1), are widely used in 5G base stations. The MgTiO 3 -CaTiO 3 microwave dielectric ceramics possess remarkable microwave dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of V₂O_5/CeO₂ doped (Mg_0.95Ca_0.05)TiO₃‐MgO and their application to a dielectric filter

Shan,

Lu,

Guo

et al. 2024

Int J Applied Ceramic Tech

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The phase composition, microstructure, sintering characteristics, and microwave dielectric properties of nonstoichiometric MgTiO3‐CaTiO3 ceramics containing an additional 0.2 mol MgO, compositely doped with various amounts of V2O5 and CeO2 additives, were studied. The results revealed that adding an optimum amount of V2O5 and CeO2 could effectively impede second‐phase formation in Mg0.95Ca0.05TiO3‐MgO. High amounts of Mg2+ can react with MgTi2O5 to reduce the content of the secondary phase. The addition facilitated the densification of the microstructure and reduction of sintering temperature. Moreover, the dielectric performances of the material were significantly influenced by V2O5 and CeO2. Mg0.95Ca0.05TiO3‐MgO doped with 0.75 wt% CeO2 exhibited excellent frequency and temperature stabilities. In particular, when co‐doped with 0.5 wt% V2O5 and 0.75 wt% CeO2, Mg0.95Ca0.05TiO3‐MgO exhibited optimum properties after sintering at 1300°C for 2 h; a dielectric constant εr ∼ 19.92 (7 GHz),a Q×f value ∼ 65,236 GHz, and a τf value ∼ −2.03 ppm/°C. This indicates the potential of the material for microwave communication applications. Finally, a dielectric filter with a center frequency of 11.55 GHz was successfully designed and fabricated using a Mg0.95Ca0.05TiO3‐MgO sample co‐doped with 0.5 wt% V2O5 and 0.75 wt% CeO2.The filter exhibited excellent performance with a bandwidth of less than 1.5 is about 40 MHz, the loss at the center frequency point was 0.7 dB, and the 3‐dB bandwidth exceeded 200 MHz, which holds a significant practical value.

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“…The materials with a rock-salt-type structure are well known to the researchers. , Notably, among them, Li 2 TiO 3 has attracted a considerable amount of attention due to its small density (∼3.1 g/cm 3 , which is lower than that of the commercial K20 microwave dielectric material: 0.95MgTiO 3 –0.05CaTiO 3 ≈ 3.7 g/cm 3 , making it one of the most promising material candidates for 5G communication equipment.…”

Section: Introductionmentioning

confidence: 99%

“…6,7 Notably, among them, Li 2 TiO 3 has attracted a considerable amount of attention due to its small density (∼3.1 g/cm 3 , which is lower than that of the commercial K20 microwave dielectric material: 0.95MgTiO 3 −0.05CaTiO 3 ≈ 3.7 g/cm 3 . 8 ), good performances, relatively low sintering temperature (∼1230 °C), low cost, and abundant source features, 9,10 making it one of the most promising material candidates for 5G communication equipment. However, it still faces problems, such as a not high enough Q × f value (∼23,600 GHz) and the large TCF (∼+38.5 ppm/°C).…”

Section: Introductionmentioning

confidence: 99%

Design of a High-Efficiency and -Gain Antenna Using Novel Low-Loss, Temperature-Stable Li₂Ti₁–_x(Cu_1/3Nb_2/3)_xO₃ Microwave Dielectric Ceramics

Guo

Zhou

et al. 2020

ACS Appl. Mater. Interfaces

175

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Microwave dielectric ceramics are vital for filters, dielectric resonators, and dielectric antennas in the 5G era. It was found that the (Cu1/3Nb2/3)4+ substitution can effectively adjust the TCF (temperature coefficient of resonant frequency) of Li2TiO3 and simultaneously increase its Q × f (Q and f denote the quality factor and the resonant frequency, respectively) value. Notably, excellent microwave dielectric properties (εr (permittivity) ≈ 18.3, Q × f ≈ 77,840 GHz, and TCF ≈ +9.8 ppm/°C) were achieved in the Li2Ti0.8(Cu1/3Nb2/3)0.2O3 (LTCN0.2) ceramic sintered at 1140 °C. Additionally, the sintering temperature of LTCN0.2 was reduced to 860 °C by the addition of 3 wt % H3BO3, exhibiting superior microwave dielectric properties (ε r ≈ 21.0, Q × f ≈ 51,940 GHz, and TCF ≈ 1.4 ppm/°C) and being chemically compatible with silver. Moreover, LTCN0.2 + 3 wt % H3BO3 ceramics were designed as a patch antenna and a dielectric resonator antenna, both of which showed high simulated radiation efficiencies (88.4 and 93%) and gains (4.1 and 4.03 dBi) at the center frequencies (2.49 and 10.19 GHz). The LTCN0.2 + 3 wt % H3BO3 materials have promising future application for either 5G mobile communication devices and/or in low-temperature co-fired ceramic technology owing to their high Q, low sintering temperature, small density, and good temperature stability.

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The structure and properties of 0.95MgTiO3–0.05CaTiO3 ceramics co-doped with ZnO–ZrO2

Cited by 13 publications

References 12 publications

Effect of excess lithium on the structure and microwave dielectric properties of LiMg_0.5Ti_0.5O₂ ceramics

Effect of excess lithium on the structure and microwave dielectric properties of LiMg_0.5Ti_0.5O₂ ceramics

Microwave dielectric properties of V₂O_5/CeO₂ doped (Mg_0.95Ca_0.05)TiO₃‐MgO and their application to a dielectric filter

Design of a High-Efficiency and -Gain Antenna Using Novel Low-Loss, Temperature-Stable Li₂Ti₁–_x(Cu_1/3Nb_2/3)_xO₃ Microwave Dielectric Ceramics

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The structure and properties of 0.95MgTiO3–0.05CaTiO3 ceramics co-doped with ZnO–ZrO2

Cited by 13 publications

References 12 publications

Effect of excess lithium on the structure and microwave dielectric properties of LiMg0.5Ti0.5O2 ceramics

Effect of excess lithium on the structure and microwave dielectric properties of LiMg0.5Ti0.5O2 ceramics

Microwave dielectric properties of V2O5/CeO2 doped (Mg0.95Ca0.05)TiO3‐MgO and their application to a dielectric filter

Design of a High-Efficiency and -Gain Antenna Using Novel Low-Loss, Temperature-Stable Li2Ti1–x(Cu1/3Nb2/3)xO3 Microwave Dielectric Ceramics

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Effect of excess lithium on the structure and microwave dielectric properties of LiMg_0.5Ti_0.5O₂ ceramics

Effect of excess lithium on the structure and microwave dielectric properties of LiMg_0.5Ti_0.5O₂ ceramics

Microwave dielectric properties of V₂O_5/CeO₂ doped (Mg_0.95Ca_0.05)TiO₃‐MgO and their application to a dielectric filter

Design of a High-Efficiency and -Gain Antenna Using Novel Low-Loss, Temperature-Stable Li₂Ti₁–_x(Cu_1/3Nb_2/3)_xO₃ Microwave Dielectric Ceramics