JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Shuai Li,Chen Li,Minmin Mao,Kaixin Song,Yaseen Iqbal,Amir Khesro,Sinan S. Faouri,Zhilun Lu,Bing Liu,Shikuan Sun,Dawei Wang
In this work, Zn-Ni co-modified LiMg 0.9 Zn 0.1- x Ni x PO 4 ( x = 0–0.1) microwave dielectric ceramics were fabricated using a solid state synthesis route. Rietveld refinement of the XRD data revealed that all ceramic samples have formed a single phase with olivine structure. SEM images showed that the samples have a dense microstructure, that agrees with the measured relative density of 97.73 %. Based on the complex chemical bond theory, Raman and infrared reflectance spectra, we postulate that ε r is mainly affected by the ionic polarizability, lattice and bond energy, while P-O bond plays a decisive role in Q×f and τ f value. Optimum properties of Q×f ~ 153,500 GHz, ε r ~ 7.13 and τ f ~ −59 ppm/°C were achieved for the composition LiMg 0.9 Zn 0.06 Ni 0.04 PO 4 sintered at 875 ℃ for 2 h. This set of properties makes these ceramics an excellent candidate for LTCC , wave-guide filters and antennas for 5 G/6 G communication applications.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
·
IF 5.532
Yu Jiang,Huan Liu,Raz Muhammad,Xinjiang Luo,Kaixin Song,Minmin Mao,Shikuan Sun,Hadi Barzegar Bafrooei,Ehsan Taheri-Nassaj,Yaseen Iqbal,Rong Sun,Dawei Wang
Garnet-typed ceramics of Y 3 Mg 1- x Mn x Al 3 SiO 12 (0 ≤ x ≤ 0.2) have been synthesized using the traditional solid-state reaction method. The optimal microwave dielectric properties ( ε r = 10.73, Q׃ = 62,824 GHz, τ f = −34.8 ppm/°C) are obtained for Y 3 Mg 0.9 Mn 0.1 Al 3 SiO 12 ( x = 0.1) sintered at 1575 °C for 5h. A millimeter-wave dielectric resonator antenna is designed and fabricated using Y 3 Mg 0.9 Mn 0.1 Al 3 SiO 12 as a dielectric unit due to its excellent characteristics of low dielectric constant and high Q׃ . The designed DRA resonates at 24.94 GHz with a bandwidth ∼2.20 GHz (S 11 < −10 dB). The simulated gain and efficiency are 6.64 dBi and 91.08%, respectively. The results indicate that the Y 3 Mg 0.9 Mn 0.1 Al 3 SiO 12 ceramic has a potential application as an antenna for the 5G/6G millimeter wave frequency band.
研究领域:
材料科学
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通信工程
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电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Baolin Guo,Xiaokang Li,Yiwen Wu,Qing Yao
Microwave dielectric ceramics, as a novel electronic material, had been extensively utilized in the fabrication of radio frequency components for communication systems, including filters, dielectric antennas, and radar applications. While dry pressing remained the most prevalent method for filter fabrication, this study proposed an innovative gel casting system for manufacturing ceramic waveguide filters. The developed system employed Hydantion epoxy resin (HER) as the gelling agent, polyethyleneimine (PEI) as the curing agent, and MgTiO 3 -CaTiO 3 (MCT) ceramic powder (exhibiting dielectric properties of ε r = 20.5, Q×f = 55,000 GHz, and τ f = ±10 ppm/°C) as the dielectric material. Experimental results demonstrated that incorporating 13 wt.% Hydantoin epoxy resin with 0.7 wt.% polyacrylic acid (PAA) dispersant yields a well-dispersed ceramic slurry containing 80 wt.% solid loading. After drying, the green body was sintered at 1400 °C for 3 h at air atmosphere. This process resulted in densified samples with homogeneous microstructure and optimized microwave dielectric properties. Building upon this foundation, a fourth-order waveguide filter was designed and fabricated with a center frequency of 3.5 GHz, bandwidth of 300 MHz, and return loss exceeding 15 dB. Compared to conventional dry pressing techniques, the gel casting approach demonstrated distinct advantages in simplified processing and cost-effectiveness. Its superior near-net-shape forming capability for complex geometries proved potential applications in next-generation 5G/6G microwave devices.
研究领域:
材料科学
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电气工程
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微波技术
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通信系统
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陶瓷工艺
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2024
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IF 3.5
Xiaohui Wu,Xixi Wang,Yulan Jing,Yuanxun Li,Hua Su
With the emergence of 5G–6G communication technology, the miniaturization and integration of electronic components are crucial. Ba 3 Ti 4 Nb 4 O 21 (BTN) ceramics with hexagonal structures have attracted special attention due to their high dielectric constant, which shows greater application potential in communication base stations and dielectric resonators. However, its high sintering temperature and low-quality factors also greatly limit the application field. In this paper, boric acid (H 3 BO 3 ) as a dopant, was used to investigate the influence on the structure, microstructure, Raman spectrum, and microwave properties for Ba 2.92 Cu 0.08 (Zn 1/3 Nb 2/3 ) 2 Ti 2 Nb 4 O 21 (BCZTN)- x HB (0.25≤ x ≤1.25 wt%) ceramics. The results reflected that H 3 BO 3 was an effective additive, which could promote ceramic densification, accelerate grain growth and uniform distribution, and enhance its microwave performance. Among them, high densification was 93.92 ± 0.35%, and the Q × f value ∼16981 ± 340 GHz at x = 0.75, was more than 2∼3 times higher than other BTN-based ceramics. Superior microwave dielectric properties were achieved for 0.75 wt% H 3 BO 3 -doped BCZTN ceramic sintered at 900°C: ε r ∼42.35 ± 0.48, Q× f ∼16981 ± 340 GHz, and τ f ∼40.02 ± 1.43 ppm/°C. More encouragingly, BCZTN-0.75HB ceramic did not chemically react with Ag, which suggested that it had the potential to be a candidate material for low-temperature co-fired ceramics base station communication devices.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Huan Liu,Yu Liu,Xueqing Yu,Minmin Mao,Bing Liu,Hadi Barzegar Bafrooei,Aihua Li,Yuanyuan Zhang,Ehsan Taheri-Nassaj,Kaixin Song,Wenjun Li,Ian.M. Reaney
New ultra-low loss, temperature-stable composite ceramics, (1- x ) Mg 1.99 Ga 0.01 Si 0.99 Al 0.01 O 4 - x CaTiO 3 , have been developed with a view to expanding the portfolio of low-cost, MW dielectrics available for 5 G/6 G telecommunications, currently dominated by 95 wt%MgTiO 3 -5 wt%CaTiO 3 , (Mg,Ca)TiO 3 (relative permittivity, ε r ∼ 21, quality factor, Q × f ∼ 56,000 GHz and temperature coefficient of resonant frequency, τ f ∼ 0 ppm/°C). Compared with (Mg,Ca)TiO 3 , 89 wt%Mg 1.99 Ga 0.01 Si 0.99 Al 0.01 O 4 -11 wt%CaTiO 3 ceramics are also temperature stable ( τ f = −2.72 ppm/°C) but have lower ε r (∼8.55) and a higher Q × f (∼ 72,900 GHz @ 12 GHz and 80,900 GHz @ 26 GHz), better suited to the higher frequencies earmarked for 6 G millimeter-wave (mm-wave) applications. To demonstrate its potential for 5 G/6 G telecommunications, a waveguide filter with novel negative coupling structure was fabricated based on simulated results. The filter had low insertion loss (0.43 dB) at the center frequency (4.8 GHz) and high selectivity with a roll-off rate of 576/375 dB/GHz. The S-parameters matched well at 25 °C and 85 °C, demonstrating that the filter had excellent temperature stability and was therefore suitable for future 5 G/6 G microwave and mm-wave communication devices.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Jian Li,Peilin Qing,Weishuang Fang,Yang Yang,Yuandong Qin,Huaicheng Xiang,Ying Tang,Liang Fang
Two tetragonal scheelite Ag 0.5 RE 0.5 MoO 4 (RE = Nd, Y) ceramics with space group I 4 1 / a were synthesized via the solid-state reaction method. Ag + and RE 3+ co-occupy the dodecahedral A-site, while Mo 6+ occupies the tetrahedral B-site. Ag 0.5 Nd 0.5 MoO 4 sintered at 825 ℃ shows a higher Q × f of 92,000 GHz, with ε r = 12.14 and τ f = -62.85 ppm/℃. Ag 0.5 Y 0.5 MoO 4 sintered at 850 °C exhibits ε r = 12.96, Q × f = 56,000 GHz, and τ f = -46.22 ppm/℃. The structure-property relationship was systematically investigated using bond valence, ionic polarizability, Raman spectroscopy, and P-V-L chemical bond theory. The larger deviation Δ ε r in Ag 0.5 Y 0.5 MoO 4 originates from the stronger overall cation rattling effect and the insufficient average ionic bonding caused by its more negative weighted average deviation factor < d > . Q × f is strongly dependent on lattice vibration damping, conductive activation energy, lattice energy, and stability of rare-earth ions. Positive τ αm values mainly govern the sign and magnitude of τ f , and the intense rattling effect of Y 3+ drives τ f closer to zero. Finally, a cylindrical dielectric resonator antenna (CDRA) was designed and simulated using Ag 0.5 Nd 0.5 MoO 4 ceramic, demonstrating its potential for high-frequency communication applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Jian Li,Xiaohan Zhang,Jia Liu,Qingxuan Zhou,Haitao Wu,Yuanyuan Zhou,Yang Wang,Wei Sun,Yanxiang Jiang,Yongning Han,Zhuoqun Han,Zhicheng Zhao,Futian Liu,Walther Glaubitt,Yongcui Zhang,Yingying Wang,Ling Li
(1- x )MgAl 2 O 4 - x MgTa 2 O 6 composite ceramics based on the MgO-Al 2 O 3 -Ta 2 O 5 pseudoternary phase diagram were prepared by the solid-state reaction. MgAl 2 O 4 and MgTa 2 O 6 could coexist due to their different crystal structures. MgAl 2 O 4 inhibited the rapid growth of MgTa 2 O 6 grains, and dense microstructures ( ρ > 95%) with a uniform grain size distribution was obtained, with an optimal densification temperature of 1550 - 1575 °C. The temperature coefficient of resonant frequency ( τ f ) and quality factor ( Q × f ) were optimized by introducing MgTa 2 O 6 phases with low dielectric loss and positive τ f . In addition, the partial solid solutions of Al 3+ into Ta 5+ sites resulted in loosening bonds within [Al/TaO 6 ] octahedra and abnormally large polarizabilities, which was confirmed by the decrease in V Ta-O and the redshift of A 1 g (Ta-O) mode. Consequently, the relative permittivity ( ε r ) and τ f values o f MgAl 2 O 4 -MgTa 2 O 6 composite ceramics were further enhanced, exceeding the predicted ones. The 0.6MgAl 2 O 4 -0.4MgTa 2 O 6 composition sintered at 1550 °C achieved excellent performance, with a near-zero τ f value of 3.3 ± 1.7 ppm/°C, a low ε r of 16.4 ± 0.3 and an ultra-high Q × f of 179,000 ± 6700 GHz @ 8.94 ± 0.04 GHz. These findings hold promising applications in the field of 5 G/6 G high-frequency communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zelai Cheng,Liming Xu,Xi Wang,Xiaohui Wu,Fangyi Huang,Yulan Jing,Hua Su
Gillespite-type SrCu 0.95 B 0.05 (B 2+ :Cu,Co,Mn,Ni,Mg,Zn)Si 4 O 10 (SCBS) ceramics were prepared by high-temperature solid-state method. Their microwave dielectric properties and crystal structure evolution were studied by P–V-L theory, bond valence model, and X-ray photoelectron spectroscopy. Varying B 2+ ion changed ionic polarizability and bond ionicity, causing dielectric constant ε r of SCBS to change. The change in quality factor Q × f was explained by lattice energy, oxidation state of Cu, and internal strain/fluctuation. The temperature coefficient of resonator frequency τ f was regulated by B–O bond length and valence. The optimal microwave dielectric properties were exhibited by SrCu 0.95 Mn 0.05 Si 4 O 10 after sintering at 1050 °C: ε r ∼5.8 ± 0.03, Q × f ∼65,589 ± 2611 GHz (@15.8 GHz), and τ f ∼ -50 ± 4 ppm/°C. These materials show great potential application prospects for 5G/6G wireless communication.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）