CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Wei Liu,Yuanxun Li,Xinyan Liu,Yongcheng Lu
In millimeter-wave communication, signal delay becomes increasingly pronounced as the operating frequency of the equipment rises. To accelerate signal transmission, substrates with low dielectric constants (ε r < 6) are required. This study synthesized a novel microwave dielectric material, NaMg (1- x ) Zn x (PO 3 ) 3 (NMZPO), using the conventional solid-phase method. The microwave dielectric properties of NaMg(PO 3 ) 3 ceramics were enhanced by substituting Mg 2+ with Zn 2+ . Specifically, Zn 2+ doping increased the ceramics' densification and reduced dielectric loss. The NaMg 0.9625 Zn 0.0375 (PO 3 ) 3 ceramic exhibited optimal microwave dielectric properties at sintering temperature 880 °C for 4h: ε r = 4.49, Q × f = 58237.2 GHz (at 17.792 GHz), τ f = −50.6 ppm/°C. In addition, NMZPO ceramics demonstrate excellent chemical compatibility with Ag electrodes. These findings indicate that NMZPO represents a promising candidate for the next generation of ultra-low dielectric constant LTCC materials.
研究领域:
材料科学
·
通信工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaohui Wu,Jingkang Xu,Yulan Jing,Yuanxun Li,Hua Su
The increasing demand for miniaturized electronic devices requires the development of advanced medium-high K materials. In this work, novel (Ti 1/2 W 1/2 ) 5+ -substituted LiNb 0.6- x (Ti 1/2 W 1/2 ) x Ti 0.5 O 3 (LNT- x TW, 0 ≤ x ≤ 0.12) ceramics were successfully prepared by the solid-state method. The increase in TW content led to the formation of LNT-0.08 TW ceramic with medium-high K and high Q × f after sintering at 1050 °C. This ceramic also recorded improved characteristics with ε r ∼53.84, Q × f ∼7482 GHz and τ f ∼43.43 ppm/°C related to ionic polarizability, large grains, high densification, and [Ti 2 O 3 ] 2+ / N layers. In addition, Li 2 O–B 2 O 3 –SiO 2 –CaO–Al 2 O 3 (LBSCA) used as an effective sintering aid, improved densification and promoted sintering by not only decreasing the temperature to 900 °C, but also enhancing the microwave dielectric properties with ε r ∼49.46, Q × f ∼8149 GHz, and τ f ∼12.04 ppm/°C. The Q × f value was estimated to 1.15 ∼ 2-fold higher than other LNT-based ceramics within stable τ f . More encouragingly, the LNT-0.08 TW ceramic also showed good chemical match with Ag, suggesting usefulness for miniaturized LTCC devices.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yan Yang,Jie Li,Huaiwu Zhang,Lichuan Jin,Fang Xu,Gongwen Gan,Gang Wang,Dandan Wen
The demand for high performance microwave devices is increasingly promoting the development of miniaturization, integration and multifunctionalization. Here, a uniform and dense NiCuZn ferrite ceramic with high saturation magnetization and low ferromagnetic resonance linewidth was obtained at 950 °C by adjusting the MnO 2 -Bi 2 O 3 composite additives. The MnO 2 -Bi 2 O 3 composite additives were composed of 0.5 wt% MnO 2 and x wt% Bi 2 O 3 (x = 0.0, 0.5, 1.0, 1.5, 2.0, and 3.0). The phase structure, microstructures and magnetic properties were systematically studied by means of modern measurement techniques. SEM images reveal that appropriate MnO 2 -Bi 2 O 3 additions can promote grain growth and reduce sintering temperatures , which is very advantageous for LTCC technology. In addition, the content of MnO 2 -Bi 2 O 3 additives can significantly reduce ferromagnetic resonance linewidth (FMR) by promoting grain growth and densification at low temperatures. Finally, a uniform and compact NiCuZn ferrite ceramic with an improved 4π M s (~ 3812.5 Gauss), a narrow Δ H (~ 144.6 Oe), and a reduced H c (~ 85.2 A/m) were obtained (at 950 °C) by adding the optimal volume of Bi 2 O 3 additive. It is expected that the improved gyromagnetic performances will allow the NiCuZn ferrite ceramics to be promising candidates for X-band microwave devices.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yan Yang,Huaiwu Zhang,Jie Li,Yiheng Rao,Gang Wang,Gongwen Gan
Miniaturization, high frequency capability, low loss, and matching impedance play critical roles in new generation antennas. Although ferrite ceramics show a great potential as antenna substrate materials, some challenges still remain associated with their application to high performance antennas. In this work, we synthesized Bi 3+ -substituted NiCuZn ferrite to adjust the microstructure, magnetic, and dielectric properties at low sintering temperatures . It is shown that Bi 3+ substitution not only enhances grain growth and compactness of NiCuZn ferrite at low sintering temperatures, but also effectively tailors the permeability, permittivity, and loss factor. In particular, NiCuZn ferrite doped with 0.025 wt%, of Bi 2 O 3 possesses excellent performance with high permeability (~29.1), high n factor (~22.76), appropriate matching impedance (Z factor = 1.28), and low loss tangents (tanδ μ = 0.00853, tanδ ε = 1.22683 × 10 -4 ). In addition, the dielectric loss is significantly reduced and becomes as low as magnetic loss at high frequencies; the typical tanδ ε reduces to 1.94 × 10 -6 , and tanδ ε / ε ´ is greatly decreases to 0.137 × 10 -6 at 50 MHz. Thus, Bi 3+ -adjusted NiCuZn ferrites open up new opportunities for applications in high-frequency LTCC antennas.
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
·
2020
·
IF 3.83
Bingjing Tao,Weifeng Wang,Huanyu Liu,Tianxiu Du,Haitao Wu,Chunfang Xing,Dongzhi Wang,Yuping Zhang
Li 4 Mg 3 [Ti 0 · 6 (Mg 1/3 Nb 2/3 ) 0.4 ] 2 O 9 (LMT 0.6 (MN) 0.4 O) ceramics doped with 1–5 wt% lithium fluoride (LiF) were prepared through a conventional solid-state reaction at a relatively low sintering temperature . The influences of the LiF additive on the micromorphology, crystal phase composition, and sintering behavior, as well as the microwave dielectric properties of the LMT 0.6 (MN) 0.4 O ceramics were explored in depth. The addition of the LiF sintering additive reduced the densification temperature of the LMT 0.6 (MN) 0.4 O ceramics from 1450 °C–950 °C. X-ray powder diffractometer patterns indicated that a single phase formed for all experimental samples. Scanning electron microscopy photographs revealed that dense and homogeneous microstructures were obtained at 950 °C for the LMT 0.6 (MN) 0.4 O ceramics with 3–5 wt% LiF. Additionally, the optimized microwave dielectric properties, including ε r = 16.24, Q·f = 107,828 GHz (at 8.13 GHz), and τ f = −6.25 ppm/°C were achieved in the prepared LMT 0.6 (MN) 0.4 O ceramics with 4 wt% LiF at the sintering temperature of 950 °C. Furthermore, the excellent chemical compatibility between this component and silver were confirmed based on the results of XRD and EDS analyses, suggesting that the LMT 0.6 (MN) 0.4 O ceramics with 4 wt% LiF could be a suitable material for the application of low temperature co-fired ceramics.
研究领域:
材料科学
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陶瓷
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微波工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yan Yang,Jie Li,Jianxiong Zhao,Xia Chen,Gongwen Gan,Gang Wang,Linfeng He
Saturation magnetization and ferromagnetic resonance linewidth are important parameters for microwave devices, such as circulator/isolator. Conventional sintering of ferrite ceramics is prevalently performed to promote the densification. Here, we present a new sintering approach for obtaining uniform and dense NiCuZn ferrite ceramics with enhanced gyromagnetic properties at low temperatures. The NiZn-series ferrites (Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 3 – 1.0 wt% Bi 2 O 3 +0.5 wt% MnO 2 ) was synthesized by solid reaction routes with new sintering approaches. The results indicate that a one-transient-step sintering process (OTSP) can significantly improve the gyromagnetic properties at low sintering temperatures by suppressing the anomalous grain growth, such as higher saturation magnetization (4π M s = ∼3904 Gauss) and lower ferromagnetic resonance linewidth ( ΔH = ∼170 Oe). Therefore, such a methodology is quite significant due to it provides a referential experience for effective sintering route that can enable broad practical applications, such as other ferrite ceramics.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Z.B. Feng,B.J. Tao,W.F. Wang,H.Y. Liu,H.T. Wu,Z.L. Zhang
Novel low temperature sintered Li 4 Mg 3 [Ti 0.8 (Mg 1/3 Ta 2/3 ) 0.2 ] 2 O 9 (LMT 0.8 (MT) 0.2 ) ceramics with 1–5 wt% LiF additives were successfully prepared by the solid-state reaction method. The effects of LiF additives on the phase composition, sintering characteristic, microstructure and microwave dielectric properties of LMT 0.8 (MT) 0.2 ceramics were investigated in detail for the first time. The sintering temperature of LMT 0.8 (MT) 0.2 ceramics could be effectively lowered to 950 °C by the addition of LiF. A single rock salt crystalline phase structure belonging to a space group of Fm-3m (No.225) was obtained through X-ray diffraction patterns. Dense uniform morphology was observed at 950 °C for LMT 0.8 (MT) 0.2 ceramics with 3–5 wt% LiF in terms of scanning electron microscopy photographs. Particularly, the LMT 0.8 (MT) 0.2 -4 wt% LiF ceramics sintered at 950 °C for 4 h possessed optimum microwave dielectric properties of ε r = 16.10, Q·f = 114,313 GHz (at 8.18 GHz) and τ f = −7.72 ppm/°C. In addition, the excellent chemical compatibility with silver metal electrodes indicated that the LMT 0.8 (MT) 0.2 -4 wt% LiF ceramics might be a promising candidate for the low-loss low temperature co-fired ceramics (LTCC) applications in microwave devices.
研究领域:
材料科学
·
陶瓷
·
微波工程
·
低温共烧陶瓷(LTCC)
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yuan-Bin Chen,Siyi Xiong
This article explores the microwave dielectric properties of (La 1-x Nd x ) 2 (Zr 0.96 Ti 0.04 ) 3 (MoO 4 ) 9 (x=0.1,0.3,0.5, and 0.7) ceramics prepared by solid-state reaction. Utilizing the Rietveld refinement technique in XRD, the sample is identified as a trigonal crystal system belonging to the R 3 ¯ c space group. SEM analysis indicates that relative density has a significant impact on the ε r and Q×f of ceramics. The Q×f values of ceramics are closely related to the FWHM of the Raman spectra. At 750℃, (La 0.5 Nd 0.5 ) 2 (Zr 0.96 Ti 0.04 ) 3 (MoO 4 ) 9 ceramic exhibited excellent dielectric properties: ε r = 10.4 (±0.08), Q×f = 149,300 (±3211) GHz, τ f = −34.8 (±0.7) ppm/℃. To gain a deeper understanding of the intrinsic mechanisms governing the microwave dielectric properties of ceramics, analysis based on the P-V-L theory reveals that the La(Nd)-O bond and Mo-O bond contribute significantly to ε r and Q×f, respectively.
研究领域:
材料科学
·
陶瓷学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·65060-65066
·
IF 5.6
Hui Yan,Yue Ma,Yong Shang,Yun Wang,Kaixin Song,Guoda Xie,Bo Wu,Xingang Ren,Xianliang Wu,Gang Wang
A series of novel low-permittivity microwave dielectric ceramics with the compositions of (1- x ) BaY 2 Si 3 O 10 - x Ba 5 Si 8 O 21 (0.3 ≤ x ≤ 0.7) and 0.4 BaY 2 Si 3 O 10 -0.6 Ba 5 Si 8 O 21 - y wt% LiF (1 ≤ y ≤ 3) were successfully synthesized using solid-state reaction sintering. The phase evolution and microwave dielectric properties of these ceramics were systematically studied. X-ray diffraction analysis indicated the coexistence of BaY 2 Si 3 O 10 and Ba 5 Si 8 O 21 phases in the (1- x ) BaY 2 Si 3 O 10 - x Ba 5 Si 8 O 21 system, with no secondary phases detected. In contrast, an additional Ba 2 Si 3 O 8 phase was identified in the LiF-modified composition (0.4 BaY 2 Si 3 O 10 -0.6 Ba 5 Si 8 O 21 - y wt% LiF (1 ≤ y ≤ 3)). Moreover, the Ba 5 Si 8 O 21 phase was found to effectively tune the temperature coefficient of resonant frequency (τ f ) to near-zero values in both systems. Excellent microwave dielectric properties were obtained for the 0.4 BaY 2 Si 3 O 10 -0.6 Ba 5 Si 8 O 21 - 2 wt% LiF ceramic, exhibiting a permittivity ( ε r ) of 7.45, a quality factor ( Q × f ) of 13,152 GHz, and a τ f value of −3.17 ppm/°C. This composition also showed good chemical compatibility with silver electrodes, suggesting its potential for use in low-temperature co-fired ceramic (LTCC) applications.
研究领域:
材料科学
·
陶瓷
·
微波介质材料
·
电子材料
·
低温共烧陶瓷（LTCC）技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 22
·26655-26665
·
IF 2.478
Yang Chengyu,Li Junkai,Lu Yang,Shan Yiting,Xian Qianqian,Zhou Hongqing
CaO-B 2 O 3 -SiO 2 (CBS) glass ceramic with various glass network modifiers were synthesized to develop a kind of material sintered at low temperature for multi-layer ceramic substrates. The influence of double alkali metal oxides (Na 2 O and K 2 O) on sintering characteristics, microstructures and dielectric properties of CBS glass ceramic were investigated. XRD analysis showed that the major crystalline phase was β-CaSiO 3 and CaB 2 O 4 , and the strength of the peak increased with the addition of network modifiers. DSC curve revealed that the process of crystallization and softening were obviously affected. SEM photographs exhibited that the microstructures were composed of amorphous phases, pores and crystalline phases. FTIR showed that the additives changed the continuity of CBS glass structure. An appropriate amount of Na 2 O and K 2 O additives could significantly improve the sintering characteristics and dielectric properties. CBS samples with 1.5 wt% (Na 2 O + K 2 O) sintered at 850 °C for 15 min presented the best performances with the bulk density of 2.53 g/cm 3 , ε r = 5.94 and tan δ = 1.22 × 10 −3 at 10 GHz.
研究领域:
材料科学
·
陶瓷学
·
电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xiaohui Wu,Qin Zhang,Fangyi Huang,Xingyu Huo,Fuyu Li,Yulan Jing,Yuanxun Li,Hua Su
In this work, a new low loss Ba 3 Ti 4- x (Mn 1/3 Nb 2/3 ) x Nb 4 O 21 (MN-BTN, 0 ≤ x ≤ 12 mol%) ceramics configuration was presented through preparing by the solid-state route. The XRD patterns, Rietveld refinement , microstructure, and microwave properties were systematically analyzed. All the fabricated MN-BTN ceramics belonged to the hexagonal structure with a P 6 3 / mcm space group. More specifically, the 6MN-BTN ceramic exhibited a high relative density of ~92.3 %, homogeneous grains distribution with an average size of ~71.95 µm, and several excellent microwave dielectric properties : ε r = 59.67, Q× f = 16,226 GHz, τ f = +103.9 ppm/℃ sintered at 1220 ℃. The incorporation of 1.5 wt % BaCu(B 2 O 5 ) (BCB) compound within the 6MN-BTN ceramic not only effectively reduced the sintering temperature from 1220 ℃ to 950 ℃, but also the excellent microwave dielectric properties were maintained: ε r = 42.33, Q× f = 11,300 GHz, τ f = +24.7 ppm/℃. Interestingly, the 6MN-BTN + 1.5 wt % BCB ceramic showed better chemical compatibility with Ag. The proposed 6MN-BTN + 1.5 wt % BCB ceramic configuration could be regarded as a promising material for LTCC applications.
研究领域:
材料科学
·
陶瓷工程
·
微波工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14368-14384
·
IF 2.478
Hu Yongcai,Du Zhaofu,Yao Yingbang,Ma Yue,Li Yi,Xu Yiwen,Zhao Xiaobo,Tao Tao,Liang Bo,Lu Shengguo
Silver powders were prepared by a chemical reduction method. Effects of different surfactants during this preparation process were examined. Using these silver powders, silver pastes were prepared for low temperature co-fired ceramics (LTCC) applications. Another batch of different surfactants were added into the silver paste and evaluated. Moreover, various organic thixotropic agents were used to modify the thixotropy behavior of the silver paste. It was found that the surfactants of PVP (Polyvinyl pyrrolidone, for preparation of the silver powder) and Span-85 (for the preparation of silver paste) exhibited the best performance, with an electrical resistivity of 0.11 mΩ mm. The silver paste with the thixotropic agent of hydrogenated castor oil shows the largest thixotropic index of 1.56. Using different organic additives, the microstructural, rheological and electrical properties of the silver paste can be considerably improved, and our results shed light on the optimization of the silver paste for LTCC applications.
研究领域:
材料科学
·
化学工程
·
电气工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）