CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Jin Fang,Tao Ni,Minmin Mao,Yu Liu,Huan Liu,Lei Cao,Xueqing Yu,Bing Liu,Hadi Barzegar Bafrooei,Liang He,Yingjie Ren,Fayaz Hussain,Dawei Wang,Kaixin Song
MgSiO 3 ceramics with a low dielectric constant are highly promising for application in 5G communication due to their excellent performance and cost-effectiveness. However, the application remains constrained by phase transitions. This study aims to unlock their full potential by introducing Cu ions to mitigate phase transitions, thereby achieving stable and superior performance. Mg 1- x Cu x SiO 3 (0 ≤ x ≤ 0.25) ceramics were synthesized by solid-state method, and the effects of Cu introduction on the crystal structure, phase constitution, microstructure and microwave dielectric properties were systematically investigated. Through XRD patterns and Rietveld refinement , it was found that when x = 0, both protoenstatite (PEN) and low-temperature clinoenstatite (CEN) phases coexist due to a phase transition from PEN to CEN. As x increases, the PEN phase dominance rises while the CEN phase diminishes, indicating that the addition of Cu ions inhibits the occurrence of phase transition. At x ≥ 0.2, only the orthoenstatite (OEN) phase was observed. SEM and EDS analyses revealed the beneficial impact of Cu introduction on sintering, yet excessive amounts can lead to abnormal grain growth , local segregation, and uneven distribution of Cu elements, thereby deteriorating microwave dielectric properties . The optimal microwave dielectric performance was achieved at x = 0.05: ε r = 6.2, Qf = 93,600 GHz, τ f = −33.7 ppm/°C. A one-year long-term comparative study revealed the stabilizing effect of Cu incorporation for obtaining stable excellent performance. These findings underscore the potential of introducing an appropriate amount of Cu to achieve stable and superior microwave dielectric properties in MgSiO 3 ceramics, paving the way for practical applications in 5G communication.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
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
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Ruixiang Deng,Bingbing Chen,Haogeng Li,Ke Zhang,Tao Zhang,Yun Yu,Lixin Song
Microwave absorbers serve the purpose to ensure the transmission efficiency and accuracy in 5G telecommunications. Two-dimensional MXene has great potential in absorbing microwave. In this study, MXene(Ti 3 C 2 T x )/Co 3 O 4 composites are successfully fabricated by a facile and stable hydrothermal treatment in concentrated strong base and Argon environment, followed by a one-step annealing process. Phase composition , chemical state of elements, morphology and structure of the new composite materials are studied by systematical characterization. It is revealed that adsorbed Na + ions and terminations, which are generated at the interface during hydrothermal treatment in concentrated NaOH solution, can protect the Ti 3 C 2 T x from being decomposed. The synthesis mechanism is also proposed for stable fabrication of other MXene-based composite materials. The MXene/Co 3 O 4 composite is able to perform single-band absorption, multiband absorption and even broadband absorption in 2–18 GHz band by tuning its composition and thickness. Particularly, better than 90% absorption in a wide range of 10.8–17 GHz can be achieved with a thickness of just 2 mm. Enhanced wideband absorption originates from the multilayer structure , the surface defects , the conductivity of Ti 3 C 2 T x and the capacitance structure of Co 3 O 4 . Ultrathin and broadband high absorption features make the material a promising candidate for future application.
研究领域:
材料科学
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电磁材料
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通信技术
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 7
·3896-3902
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IF 2.047
Cheng Jiawen,Qing Zhenjun,Wang Jin,Zhao Yun,Zhou Xin,Zou Huapeng,Li Haiyan,Li Yingxiang
In this paper, the traditional solid-phase reaction sintering process was used to synthesize Ca 1-x Mg x V 2 O 6 (x = 0.03, 0.06, 0.09, 0.12) ceramics under low-temperature conditions. The effects of partial replacement of Ca 2+ by Mg 2+ on the A-site on the crystalline type, sintering temperature, microstructure, densification, and microwave dielectric performances of Ca 1-x Mg x V 2 O 6 ceramic were studied. The only crystalline phase of CaV 2 O 6 was observed in the ceramics. The sintering densification and dielectric performances of the Ca 1-x Mg x V 2 O 6 ceramic show a trend of first increasing and then decreasing with the increase of Mg 2+ content. The addition of Mg ions can effectively increase the Q × f value of the Ca 1-x Mg x V 2 O 6 ceramics but cannot improve the τ f value. The Ca 0.91 Mg 0.09 V 2 O 6 ceramic sintered at 725°C displayed good microwave dielectric performances: ε r = 10.41, Q × f = 68524 GHz, and τ f = − 36.8 ppm/°C. The good dielectric properties of this ceramic can meet the development needs of 5G communication technologies.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
ACS Applied Engineering Materials
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2023
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IF 0
Hailong Wang,Dan Yang
With the emergence of the 5G era, the high-precision operation of electronic devices usually results in high heat flux and increases the local heating power, seriously limiting their stability and service life. This paper presents a method for producing a thermally conductive filler by first noncovalently modifying silicon carbide (SiC) particle with poly(catechol/polyamine) (PCPA) and then covalently functionalizing it with 3-mercapto-propylethoxy-bis(tridecyl-pentaethoxy-siloxane) (Si747), which is labeled as SiC-PCPA-Si747. Next, the prepared SiC-PCPA-Si747 filler is added to the natural rubber (NR) matrix for producing SiC-PCPA-Si747/NR composites with high thermal conductivity (λ). The noncovalent modification of PCPA preserves the intrinsic λ of SiC, while the covalent functionalization with Si747 enhances the interfacial interaction between the filler and NR matrix. As a result of the reduced interfacial thermal resistance and the formation of high-efficiency heat conduction channels, the NR composite filled with 50 vol % SiC-PCPA-Si747 filler shows a λ value of 0.4980 W/(m·K), which is about 475% higher than that of pure NR (0.0866 W/(m·K)). In short, this method is cost-effective and feasible and can be used to fabricate polymeric composites with high λ that can meet the future demands of advanced electronic devices.
研究领域:
材料科学
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高分子化学
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电子器件散热
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DOI
CHINESE JOURNAL OF POLYMER SCIENCE
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2019
·Vol. 38
·期 3
·213-219
·
IF 2.804
Qian Chao,Fan Zhen-Guo,Zheng Wei-Wen,Bei Run-Xin,Zhu Tian-Wen,Liu Si-Wei,Chi Zhen-Guo,Aldred Matthew P.,Chen Xu-Dong,Zhang Yi,Xu Jia-Rui
High-performance low- k and low-loss circuit materials are urgently needed in the field of microelectronics due to the upcoming Fifth-Generation Mobile Communications Technology (5G Technology). Herein, a facile design strategy for non-fluorinated intrinsic low- k and low-loss polyimides is reported by fully considering the secondary relaxation behaviors of the polymer chains. A new amorphous non-fluorinated polymer (TmBPPA) with a k value of 2.23 and a loss tangent lower than 3.94 × 10 −3 at 10 4 Hz has been designed and synthesized, which to the best of our knowledge is the lowest value amongst the non-fluorinated and non-porous polymers reported in literature. Meanwhile, TmBPPA exhibits excellent overall properties, such as excellent thermostability, good mechanical properties, low moisture absorption, and high bonding strength. As high-performance flexible circuit materials, all these characteristics are highly expected to meet the present and future demands for high density, high speed, and high frequency electronic circuit used in 5G wireless networks.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 11
·7585-7596
·
IF 3.9
Heming Li,Xinming Wang,Yuze Gong,Hongbin Zhao,Zhaobin Liu,Lin Tao,Youyou Peng,Ke Ma,Zhizhi Hu,Davoud Dastan
Dielectric properties of polyimide (PI) are constrained by its inherent molecular structure and inter-chain packing capacities. The compromised dielectric properties of PI, however, could be rescued by introducing trifluoromethyl and forming a host–guest inclusion complex with the introduction of crown ethers (CEs). Herein, we report PI/crown ether composite films as a communication substrate that could be applied under high frequency circumstances. In this work, three kinds of bisphenol A-containing diamine (2,2′-bis[4-(4-aminophenoxy)phenyl]propane, 2,2-bis[4-(2-methyl-4-aminophenoxy)phenyl]propane, and 2,2-bis[4-(2-trifluoro methyl-4-aminophenoxy)phenyl]propane) are synthesized and polymerized with 4,4′-(hexafluoroisopropylidene)diphthalic anhydride to prepare low-dielectric PI films by means of thermal imidization. Crown ethers are introduced into the PI with different mass fractions to obtain three series of PI films. Following the combination of trifluoromethyl into the molecular chain of PI, high frequency dielectric loss of modified PI films can be effectively reduced. The properties of these materials (especially the dielectric properties) are thoroughly explored by crown ether addition. The results show that the crown ether addition process can offer crown ethers with increased free volume of PI matrix, thus allowing them to generate a special necklace-like supramolecular structure, which makes the crown ether disperse more uniformly in the PI matrix, resulting in improved dielectric properties. Importantly, the dielectric constant and dielectric loss of the composite films at high frequencies are remarkably reduced to 2.33 and 0.00337, respectively. Therefore, these composite films are expected to find extensive use as a 5G communication substrate at high frequencies in the future.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Fangyi Huang,Jiaqing Du,Xiaoli Tang,Qin Zhang,Xingyu Huo,Yuanxun Li,Xian Jian,Hua Su
Ba 0.8 Sr 0.2 CuSi 2 O 6 ceramics have a low dielectric constant, which is useful for low-latency 5G communication. To enable the preparation of Ba 0.8 Sr 0.2 CuSi 2 O 6 low-temperature co-fired ceramic (LTCC) materials, LBSCA and LBBS were used in this paper to reduce the sintering temperature of Ba 0.8 Sr 0.2 CuSi 2 O 6 . The effects of LBSCA and LBBS on the phase composition, densification, microscopic morphology, and vibrational characteristics of the ceramics were investigated by X-ray diffraction, scanning electron microscopy, density measurements, and Raman spectroscopy , and the causal factors influencing the microwave dielectric properties with the addition of glass were analyzed. It was found that 0.4 wt% LBSCA glass and 1 wt% LBBS glass reduced the sintering temperature to 925 °C, and these prepared ceramics had excellent microwave dielectric properties. The ceramic prepared with 0.4 wt% LBSCA glass had an ε r value of 7.672, Q × f value of 37193 GHz, and τ f value of −14.93 ppm/°C, while the ceramic prepared with 1 wt% LBBS glass had an ε r value of 7.512, Q × f value of 32136 GHz, and τ f value of −13.92 ppm/°C. The phase composition of the ceramics did not significantly change, indicating that neither glass reacted with the ceramics. The ε r value was affected by both density and Raman shift, the trend in the Q × f values was consistent with the density, and the τ f value decreased with increasing glass content, which was attributed to the liquid phase generated by the glass in the ceramic. In addition, co-firing these glass-doped ceramics with Ag at a low temperature resulted in good chemical compatibility. Combined with the near-zero τ f , these results demonstrate the excellent promise of these two ceramics as alternative materials for LTCC microwave devices and their application in 5G communication.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
·
IF 5.7
Changzhi Yin,Kang Du,Zhengyu Zou,Xiaoqiang Song,Ying Xiong,Fei Wang,Meng Zhang,Weicheng Lei,Yaodong Liu,Wenzhong Lu,Chunchun Li,Wen Lei
A novel microwave dielectric ceramic of SrGa 2 Si 2 O 8 was synthesized using the traditional solid-state method. Its phase composition, microstructure, and microwave dielectric properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy , and network analyzer . XRD results indicated that the space group of the ceramic transformed from I 2 /c to P 21 /a at 700 °C. A combination of good microwave dielectric properties was obtained at 1260 °C with ε r = 6.3, Q × f= 96,600 GHz and τ f = −45.2 ppm/°C at 16.5 GHz. The negative τ f can be tuned to near zero by adding 15 mol% CaTiO 3 . The densification temperature can be reduced to 940 °C by adding 4 wt% LiF. Moreover, the SrGa 2 Si 2 O 8 ceramic had good chemical compatibility with the Ag electrode. A patch antenna was designed using the 0.85SrGa 2 Si 2 O 8 + 0.15CaTiO 3 + 4 wt% LiF ceramic. The antenna had a high radiation efficiency of 99.2 % and a gain of 2.988 dBi at the center frequency of 4.261 GHz. All results indicated that the SrGa 2 Si 2 O 8 ceramic has promising potential for applications in 5 G wireless communication technology.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Fan Yang,Xiunan Li,Ye Sun,Wanying Yang,Dong Jiang,Jianxin Mu,Guibin Wang,Yanhua Yang
With the rapid development of 5 G technology, the heat dissipation of electronic devices has become an important challenge. It is particularly essential to construct efficient thermal transfer networks in order to obtain advanced materials with superior thermal conductivity as well as excellent electrical insulating properties. In this work, poly (ether ether ketone) (PEEK) was sulfonated to achieve its solubility for electrospinning. Multi-scale hybrid fillers containing hydroxylated boron nitride nanosheets (fBNNSs) and carboxylated multi-walled carbon nanotubes (fMWCNT) are aligned along the direction of sulfonated PEEK (SPEEK) fibers during electrospinning process where fMWCNT with high aspect ratio can be used as mediators to connect the dispersed fBNNSs resulting in synergistic effect to extensively improve the thermally conductive performance. The hydrogen bond interaction among sulfonic acid group, carboxy groups and hydroxy groups from the matrix and modified fillers can not only make the fillers disperse uniformly but also improve the interfacial properties, thus reducing the phonon scattering at the interface efficiently, to enhance the thermal conductivity significantly at relatively low filler loading. fBNNSs@fMWCNT/SPEEK composite exhibits excellent thermal conductivity (λ) of 5.25 W/(m·K) when the filler content reached by 26 wt% with the ratio of fBNNSs to fMWCNT of 25:1(wt:wt). Under the composition above, the excellent electrical insulating property (2.54×10 15 Ω·cm) is achieved as well. Furthermore, fBNNSs@fMWCNT/SPEEK fiber membrane can be used as thermally conductive filler to construct a "sandwich" structured composite with PEEK film. When the mass ratio is 1:1, the λ of composite is 3.1 W/(m·K), which is 1200% higher than that of PEEK. This work provides better understanding of PEEK based thermal conductive composites for the prospective application of thermal management materials in electrical insulating related fields.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Bolong Wang,Guangyong Li,Liang Xu,Jianhe Liao,Xuetong Zhang
With the advent of the 5G era, electronic systems have become more and more powerful, miniaturized, integrated ,and intelligent. The thermal management of electronic systems requires more efficiency and multiple functions for their practical applications, especially for the portable 5G electronic devices of the future, as the undesired heat can cause thermal discomfort or even thermal injury to people who use these electronic devices. Herein, two thermal management strategies based on boron nitride (BN) aerogel films have been proposed and demonstrated for portable devices. First, a flexible BN aerogel film with high porosity (>96%), large specific surface area (up to 982 m2 g–1), and controllable thickness (in the range from 50 to 200 μm) was fabricated via molecular precursor assembly, sublimation drying, and pyrolysis reaction in sequence. The resulting BN aerogel film individuals, serving as a thermal insulation protecting layer in portable electronics, can significantly reduce heat transfer from electronics to skin. Second, BN phase change composite films, made by dipping BN aerogel films into the melts of the organic phase change materials (e.g., paraffin), can effectively cool the portable electronics as the organic phase change materials filled in the aerogel matrix can serve as a smart thermal-regulator to absorb the undesired heat via solid–liquid phase transition. These two typical strategies of the flexible BN aerogel film-directed thermal management could assist in efforts to miniaturize, integrate, and intelligentialize portable 5G electronic devices in the future.
研究领域:
材料科学
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热工程学
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电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhiqian Yao,Yuxin Liu,Yong Zhang,Xueru Zhang,Yunfei Wu,Jiewu Cui,Jiaheng Wang,Yan Wang,Jiaqin Liu,Yucheng Wu
With the advancement and escalating demands of 5 G communication, low-frequency bands (2–8 GHz) have emerged as a pivotal area of focus in the research of electromagnetic wave (EMW) absorption. While magnetic metals and alloys have demonstrated efficacy in low-frequency absorption, they are hampered by high density, limited absorption bandwidths, and the complexities involved in tuning the absorption bands. This study presents a core-shell architecture where flaky iron carbonyl powder (FCIP) is encapsulated within lanthanum-doped silica (SiO 2 ), thereby significantly enhancing its low-frequency absorption capabilities. By meticulously adjusting the La 3 + doping content, we have successfully achieved tunable microwave absorption within the 5 G new radio (NR) bands, with a specific focus on the n77 (3.3–4.2 GHz), n78 (3.3–3.8 GHz), and n79 (4.4–5.0 GHz) frequency ranges. The minimum reflection loss (RL min ) of the composites is −54.86 dB at a thickness of 2.81 mm. The incorporation of La 3+ into the silica shell induces a synergistic magnetic/dielectric effect, significantly augmenting impedance matching and wave absorption. Based on a strategically devised La 3+ doping approach, we have engineered an architecture that manifests gradient metamaterial characteristics, achieving an ultra-wide effective absorption bandwidth (EAB) spanning from 1.2 to 18 GHz. This research not only provides a practical methodology but also unveils a novel strategy to substantially enhance the microwave absorption performance of traditional metal alloys and their compounds.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）