Broad sintering temperature range and stable microwave dielectric properties of Mg2TiO4–CeO2 composite ceramics

Wang, Xi; Zhou, Shicheng; Liu, Kaiyang; Deng, Shan; Xiao, Yaqi; Chen, Xiuli; Zhou, Huanfu

doi:10.1016/j.ceramint.2022.03.304

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…Herein, according to the results of XRD and EDS analyses, xMgO-SiO 2 (x = 1~2) ceramics can be considered as composites with the coexistence of Mg 2 SiO 4 and MgSiO 3 . In this case, the theoretical dielectric constant ε L of the composite can be calculated by the Lichteneker mixing rule [29], given as…”

Section: Resultsmentioning

confidence: 99%

Crystal Structure and Microwave Dielectric Property of xMgO-SiO2 (x = 1~2) System for 5G Applications

Wang,

Li,

Zhu

et al. 2023

Crystals

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Mg2SiO4 and MgSiO3 ceramics with superior microwave dielectric properties are considered to be promising candidates for 5G applications. However, a slight deviation from the stoichiometric Mg/Si ratio will significantly influence their microwave dielectric properties, which will hinder their practical applications. In this work, the xMgO-SiO2 (x = 1~2) ceramics were synthesized by a solid-state reaction method. The influence of the Mg/Si ratio x on the crystalline phase, microstructure, and microwave dielectric properties was investigated through X-ray diffraction (XRD), a scanning electron microscope (SEM), and the resonant cavity method. The XRD patterns revealed the coexistence of Mg2SiO4 and MgSiO3 within the x range of 1~2, which was further demonstrated by the energy-dispersive X-ray spectra. The SEM images show a typical polycrystalline morphology of ceramics with an inhomogeneous grain size distribution. It is found that the microwave dielectric properties fluctuate at both sides of the x range while those remain relatively stable with minor changes at the intermediate components, indicating an obvious low composition dependence helpful for practical applications. Further, a demonstrator of a microstrip patch antenna for 5G applications using the 1.5MgO-SiO2 ceramic was designed and fabricated, and a return loss of −16.2 dB was demonstrated, which demonstrated the potential applications.

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Section: Resultsmentioning

confidence: 99%

Crystal Structure and Microwave Dielectric Property of xMgO-SiO2 (x = 1~2) System for 5G Applications

Wang,

Li,

Zhu

et al. 2023

Crystals

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“…Moreover, CeO 2 exhibited good microwave dielectric properties with ε r = 24 and Q×f = 60000, which was used as dopant to improve the properties. 21 Hence, the influence of V 2 O 5 -CeO 2 dopants on the sintering properties, dielectric properties, phase composition, microstructure densification, temperature stability, and frequency stability of MCT ceramics was systematically investigated in this study. After drying, the powders were screened through a sieve and pre-sintered at 1200 • C for 3 h. Thereafter, the powders were mixed with V 2 O 5 (0.5 wt%) and CeO 2 (x wt%, where x = 0, 0.5, 0.75, and 1) and milled using zirconium balls in deionized water for 12 h. The wet mixtures were then dried at 100 • C in an oven.…”

Section: Introductionmentioning

confidence: 99%

“…V 2 O 5 with a melting point of 690°C, forms a liquid phase at sintering temperature and promotes and accelerates densification. Moreover, CeO 2 exhibited good microwave dielectric properties with ε r = 24 and Q×f = 60000, which was used as dopant to improve the properties 21 . Hence, the influence of V 2 O 5 –CeO 2 dopants on the sintering properties, dielectric properties, phase composition, microstructure densification, temperature stability, and frequency stability of MCT ceramics was systematically investigated in this study.…”

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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Insights on Elastic Anisotropy and Thermal Properties of Mg–Ti–O Compounds from First‐Principles Calculations

Ma,

Zhang,

Fan

et al. 2023

Physica Status Solidi (b)

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First‐principles calculations are employed to explore the elastic anisotropy and thermal properties of Mg–Ti–O compounds (MgTiO3, MgTi2O5, and Mg2TiO4). The structure parameters used in this work are in good agreement with other theoretical and experimental results. The mechanical stability and ductile nature are demonstrated. The elastic anisotropy is characterized by different anisotropy indexes, three‐dimensional (3D) surface constructions, and two‐dimensional (2D) projections of Young's modulus. Besides, the sound velocities, Debye temperature, and minimum thermal conductivity are also investigated from the elastic modulus. The obtained results can provide references for future experimental investigations and engineering applications of these Mg–Ti–O compounds.

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Broad sintering temperature range and stable microwave dielectric properties of Mg2TiO4–CeO2 composite ceramics

Cited by 11 publications

References 36 publications

Crystal Structure and Microwave Dielectric Property of xMgO-SiO2 (x = 1~2) System for 5G Applications

Crystal Structure and Microwave Dielectric Property of xMgO-SiO2 (x = 1~2) System for 5G Applications

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

Insights on Elastic Anisotropy and Thermal Properties of Mg–Ti–O Compounds from First‐Principles Calculations

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Broad sintering temperature range and stable microwave dielectric properties of Mg2TiO4–CeO2 composite ceramics

Cited by 11 publications

References 36 publications

Crystal Structure and Microwave Dielectric Property of xMgO-SiO2 (x = 1~2) System for 5G Applications

Crystal Structure and Microwave Dielectric Property of xMgO-SiO2 (x = 1~2) System for 5G Applications

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

Insights on Elastic Anisotropy and Thermal Properties of Mg–Ti–O Compounds from First‐Principles Calculations

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