JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Linzhao Ma,Guo Tian,Hongzhi Xiao,Longxiang Jiang,Qianbiao Du,Hao Li,Bin Yang
This research used the co-substitution strategy to prepare novel spinel-type Mg 3 Ga 2 SnO 8 ceramics sintered at 1430–1510 °C. Rietveld refinement and SEM showed that the Mg 3 Ga 2 SnO 8 ceramic had a cubic spinel structure with a space group of F d 3 ¯ m ( 227 ) , where Mg1 and Mg2/Ga1/Sn1 occupy the tetrahedron and octahedron, respectively. The relative density exhibited a considerable influence on the ε r of Mg 3 Ga 2 SnO 8 ceramics. In addition, the Q × f of the ceramics was closely related to the packing fraction and FWHM. Infrared reflection spectra were used to investigate the intrinsic dielectric characteristics of the ceramics. The P−V−L theory indicated that Sn−O and Ga−O bonds contribute substantially to the ε r and Q × f , respectively. The Mg 3 Ga 2 SnO 8 ceramics had the optimum microwave dielectric properties of ε r = 9.3, Q × f = 189,052 GHz, and τ f = −34.25 ppm/°C when sintered at 1470 °C. Therefore, Mg 3 Ga 2 SnO 8 ceramics exhibit a wide range of possible applications in the field of microwave media.
研究领域:
材料科学
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电子材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zelai Cheng,Xingyu Huo,Zhen Zhao,Feng Qiao,Xiuling Yang,Ying Chen,Mingshan Qu,Hua Su
This work presents a miniaturization strategy for ferrite circulators by enhancing the dielectric constant ε r of NiCuZn ferrites and LTCC technology. Highly polarizable Cu 2+ and Ti 4+ substitutions for Ni 2+ and Fe 3+ increase dielectric constant, while non-magnetic Ti 4+ reduces magnetocrystalline anisotropy and narrows ferromagnetic resonance linewidth ΔH , with Cu 2+ concurrently lowering sintering temperatures. In the Ni 0.42-x/2 Cu 0.18+x Zn 0.4 Ti x/2 Fe 1.98-x O 4-δ system, the x = 0.1 composition (sintered at 975 °C) achieves minimal ΔH (82 Oe), ε r ≈ 14.6, and 4π M s ≈ 4219 G, whereas x = 0.6 (sintered at 925 °C) balances ε r ≈ 20.8 with magnetic performance ( ΔH ≈167 Oe, 4π M s ≈ 2117 G), confirming LTCC compatibility. A heterostructured substrate fabricated by co-firing Ni 0.12 Cu 0.78 Zn 0.4 Ti 0.3 Fe 1.38 O 4-δ ferrite (x = 0.6) with a microwave dielectric (50 wt.% SrCu 0.95 Mn 0.05 Si 4 O 10 + 50 wt.% Sr 3 V 2 O 8 ) exhibits controlled interfacial diffusion. HFSS simulations demonstrate that the integrated circulator-filter achieves significant miniaturization with >30 dB harmonic suppression (14-24 GHz) while maintaining in-band performance (| S 21 | < 1 dB, | S 11 | and | S 12 | < -20 dB at 7-12 GHz). The validates high- ε r NiCuZn ferrites and LTCC composite substrates for compact multifunctional microwave components.
研究领域:
微波工程
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材料科学
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电磁学
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铁氧体技术
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集成电路设计
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陶瓷工艺
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Huiying Fan,Yun Zhang,Shihua Ding
Li (1+ x ) AlSiO 4 ceramics were synthesized using the conventional solid-state reaction method. X-ray diffraction analysis indicated that they crystallized in single-phase hexagonal structure. Li loss was studied using the thermogravimetric-differential scanning calorimetry (TG-DSC). Appropriate excess Li resulted in sintering temperature reduction from 1325 ℃ to 1225 ℃. The ultra-low dielectric constant ( ε r ) was influenced by the polarizability per unit volume. Theoretical calculations manifested that enhancing the packing fraction suppressed lattice vibrations, resulting in a significant increase in the quality factor ( Q×f ). Compared with the pure phase samples, adding Li ions optimized the thermal stability of the ceramics. Specifically, Li 1.02 AlSiO 4 demonstrated optimal microwave dielectric properties with ε r = 4.13, Q×f = 45,387 GHz and τ f = -35.54 ppm/°C, making it a spacious application prospect in the field of 6 G 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 EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118901
·
IF 6.3
Zipeng Huang,Lili Gan,Lihua Qiao,Yanru Wu,Chenru Hao,Li Cheng,Ziqiang Chi
Microwave dielectric ceramics for next-generation communication systems require a high relative permittivity (
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2022
·Vol. 105
·期 10
·6293-6301
·
IF 4.186
Haiyi Peng,Chuanqing Zhao,Haishen Ren,Tianyi Xie,Zhongyuan Gu,Shifeng Deng,Xiaogang Yao,Huixing Lin
A “self-permeation” method was used to fabricate a Ca 0.9 La 0.067 TiO 3 -0.01Al 2 O 3 (CLT)-reinforced polysilylaryl-enyne/fiber multilayer board with different volume fractions of CLT (0–40 vol%). The microstructure, dielectric, mechanical, and thermal properties were fully studied. The results showed that the composite with optimal dielectric properties (ε r ∼8.75, tanδ∼0.0043) could be obtained when the volume fraction of CLT reached 30 vol%. Meanwhile, the thermal conductivity reached a high level of 0.644 W/(m·K) and 0.762 W/(m·K) at Z and X/Y directions, respectively. Due to the high decomposition temperature of PSAE, T d5 (the temperature corresponding to 5% weight loss) of composite loading with 30 vol% CLT was higher than 900℃, which indicates an excellent thermal resistance. And the bending strength could reach 115.3 MPa indicating excellent mechanical property. The novel polysilylaryl-enyne/fiber/Ca 0.9 La 0.067 TiO 3 -0.01Al 2 O 3 multilayer board with excellent performance is expected to be a candidate material for print circuit boards and widely used in the microwave communication field.
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 EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Changzhi Yin,Kang Du,Meng Zhang,Jiaqing Yang,Fei Wang,Yanbo Guo,Mingfei Cheng,Yiyang Cai,Xiaoqiang Song,Jibran Khaliq,Chunchun Li,Wen Lei,Wenzhong Lu
High-speed signal propagation systems require dielectric ceramics with low relative permittivity (ε r ) and a high-quality factor ( Qxf ). In this paper, a novel low-permittivity borate ceramic (LiBO 2 ) was synthesized using a conventional solid-state reaction method. Based on the X-ray diffraction and Rietveld refinement , the LiBO 2 crystallized into a monoclinic structure with a space group of P21/c. Dense and single-phase ceramic was obtained at 640 °C with comprehensive microwave dielectric properties : a low relative permittivity ( ε r ) of 5.3, a moderate quality factor ( Q × f ) of 18,200 GHz at 16.3 GHz, and a temperature coefficient of resonant frequency (τ f ) of − 66.2 ppm/°C. Good chemical compatibility with Ag electrode and thermal expansion coefficient of 25.4 ppm/°C was achieved demonstrating the potential applications as dielectric resonances in wireless communications and substrates in low-temperature cofired ceramics.
研究领域:
材料科学
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电子工程
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 4
·2614-2625
·
IF 2.1
Jiang Xi,Zhang Yun,Ding Shihua,Song Tianxiu,Hou Zhengpeng,Xiao Junwen,Wang Yarong
MO-ZrO 2 -Ta 2 O 5 (M = Zn, Co) ceramics were prepared by solid-phase reaction method. Thermo-gravimetric-differential thermal behavior, crystal structure, and microwave dielectric properties of ZnO-ZrO 2 -Ta 2 O 5 and CoO-ZrO 2 -Ta 2 O 5 ceramics were compared in this paper. Both of them exhibited monoclinic wolframite structure. Densest microstructures with uniform grains were obtained at 1400°C and 1425°C in the cases of M = Zn and Co, respectively. ZnO-ZrO 2 -Ta 2 O 5 and CoO-ZrO 2 -Ta 2 O 5 exhibited comparable ε r ~ 20.26 and 24.30, while the former had Q × f ~ 60, 983 GHz and the latter had Q × f ~ 95,300 GHz. The grain growth exponent and activation energy obtained from the phenomenological kinetic equation indicated the growth process of ceramics. The grain growth of Zn-based ceramic was dominated by interfacial reactions and lattice diffusion. For the other one, the grain growth mechanisms were grain boundary diffusion and lattice diffusion at high temperatures. The grain growth progress of them both affected by lattice diffusion. The growth process of ZnO-ZrO 2 -Ta 2 O 5 ceramics was faster than that of CoO-ZrO 2 -Ta 2 O 5 ceramic. However, the grains were overgrown and grew slowly at 1425°C and 1450°C, which was caused by the excessive high temperature.
研究领域:
材料科学
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陶瓷
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微波技术
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固体物理
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
·
IF 6.364
Jiangyu Zhang,Jie Li,Yihua Sun,Liang Fang
LiYbO 2 ceramic with tetragonal structure formed only by [LiO 6 ] and [YbO 6 ] octahedra, exhibited a ε r of 13.3 ± 0.2, Q × f of 24,700 ± 500 GHz and an abnormal positive τ f of + 38.6 ± 3.0 ppm/°C as sintered at 1100 °C with low relative density of 88 %. Dense ceramic with relative density of 95.1 % was obtained with the addition of 1 wt% LiF when sintered at 1080 °C, exhibiting enhanced microwave dielectric properties of ε r = 14.3 ± 0.2, Q × f = 41,200 ± 500 GHz, τ f = +56.5 ± 3.0 ppm/°C and α L = 8.5 × 10 −6 /K. The large positive discrepancy as much as + 45.1 % between measured ε r with porosity correction and calculated ε r (C-M) using Clausius−Mossotti relations might be due to the rattling effect of Li + , which also led to the positive τ f .
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 7
·e71021
·
IF 4.2
Linjie Li,Maolong Qiao,Yuanlu Xu,Yanan Zhang,Yan Liu,Weijia Han,Guochao Wei,Xiaoming Zhang,Ying Yang,Kang Du
Combeite-type Na 2 Ca 2 Si 3 O 9 ceramics were fabricated via the conventional solid-state reaction route, and their phase compositions, microstructural features, and microwave dielectric properties were systematically investigated for the first time. The results reveal that single-phase Na 2 Ca 2 Si 3 O 9 ceramics with a hexagonal structure ( P 3 1 2 1 space group) can be obtained after sintering at 1150°C–1300°C. The specimen sintered at 1285°C delivers optimal microwave dielectric properties: a relative permittivity ( ε r ) of 6.68, a high-quality factor ( Q × f ) of 11 110 GHz, and a temperature coefficient of resonant frequency (τ f ) of −42.38 ppm/°C. To compensate the negative τ f and enhance the temperature stability of Na 2 Ca 2 Si 3 O 9 ceramic, CaSnSiO 5 was adopted as a τ f regulator to prepare (1– x ) Na 2 Ca 2 Si 3 O 9 - x CaSnSiO 5 (0.36 ≤ x ≤ 0.65) ceramics. Rietveld refinement combined with SEM/EDS characterizations verifies the two-phase coexistence of Na 2 Ca 2 Si 3 O 9 and CaSnSiO 5 with uniform phase distribution and dense microstructure. As x value increases, the τ f of (1– x ) Na 2 Ca 2 Si 3 O 9 - x CaSnSiO 5 composite ceramics gradually shifts from −12.65 ppm/°C ( x = 0.36) to +4.89 ppm/°C ( x = 0.65). Optimal comprehensive microwave dielectric properties are achieved at x = 0.61, with ε r = 7.48, Q × f = 14 046 GHz, and τ f = -1.2 ppm/°C. A microstrip patch antenna using this optimized composite as the dielectric substrate operates at 9.08 GHz (X-band), attaining a maximum radiation efficiency of 85.92% and a peak realized gain of 8.16 dBi. This work demonstrates that Na 2 Ca 2 Si 3 O 9 -based composite ceramics hold great promise as temperature-stable dielectric substrate for millimeter-wave communication devices.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zezhen Yin,Yun Zhang,Shihua Ding,Tianxiu Song,Xiaoning Li,Jiaying Dan
The solid-phase method was utilized to synthesize LiAl 1- x Be x O 2- x /2 and LiAl 1- x Ga x O 2 ceramics. By Phillips-Van Vechten-Levine (P-V-L) theory, a strong correlation between chemical bond characteristics and microwave dielectric properties was established. X-ray diffraction (XRD) analysis confirmed that all components formed single-phase solid solution with tetragonal structure. Using Be 2+ and Ga 3+ as substitutes, the differences in ionic radii produced diametrically opposite changes in cell volume. The relative density increased to 97.61 % (98.57 %) with the addition of Be 2+ (Ga 3+ ). According to the P-V-L theory, the variation of ε r was influenced by bond ionization. The introduction of different ions caused bond lengths variations, which in turn affected the lattice energy fluctuations. Importantly, this change more than doubled Q×f from 16,268 GHz to 37,015 GHz. Furthermore, the evolution of τ f can be elucidated by the bond energy. Sintered at 1250 °C, both LiAl 0.96 Be 0.04 O 1.98 and LiAl 0.98 Ga 0.02 O 2 demonstrated outstanding microwave dielectric properties, characterized by ε r = 5.83–6.08, Q×f = 32,727∼37,015 GHz, and τ f = −134.8∼-112.4 ppm/°C.
研究领域:
材料科学
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无机化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Binfeng Zhao,Hongye Wang,Xinwei Xu,Naichao Chen,Jin Cheng,Xiaoyu Li,Hong Wang
The development of fifth-generation (5G)/sixth-generation (6G) mobile system highlights the importance of low-temperature co-fired ceramic (LTCC) technology. However, most medium- ε r ceramics with high quality factors are unsuitable for LTCC technology due to high sintering temperatures. Herein, a series of low-temperature-sintered ZnNb 2 O 6 - x wt.%CaV 2 O 6 ceramics, denoted as ZNO- x wt.%CVO( x =5,7,9,11), characterized by medium permittivity and high quality factors, were prepared by the solid-state reaction method. CaV 2 O 6 exists as a liquid phase during the sintering process. Moreover, liquid-phase sintering is confirmed to be the predominant mechanism for low-temperature densification of ceramics, with evidence from microstructure and activation energy. Ion substitution in the main crystalline phases, induced by ZnNb 2 O 6 –CaV 2 O 6 reaction during the sintering process, causes intrinsic impacts on microwave dielectric properties. Detailed structural analysis allows a comprehensive investigation into the extrinsic and intrinsic effects of CaV 2 O 6 on microwave dielectric properties, including quality factor Q × f , dielectric constant ε r , and temperature coefficient of resonant frequency τ f . Among all compositions, the ZNO-7 wt.% CVO ceramic sintered at 870°C exhibits great properties of Q × f = 57349 GHz, ε r = 21.63, τ f = −70.39 ppm/°C, as well as good chemical compatibility with silver (Ag). Given these advantages, the ZNO-7 wt.%CVO ceramic is a highly promising candidate for medium- ε r LTCC materials in 5G/6G applications.
研究领域:
材料科学
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陶瓷工程
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微波技术
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电子材料
·
通信技术
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Bing Liu,Ke Sha,Meng Fei Zhou,Kai Xin Song,Yu Hui Huang,Cheng Chao Hu
Two novel low- ε r gallates MGa 2 O 4 (M = Ca, Sr) have been synthesized via a standard solid-state reaction method. According to the X-ray diffraction results, CaGa 2 O 4 crystallizes in space group Pna2 1 with an orthorhombic symmetry, while SrGa 2 O 4 belongs to the monoclinic P2 1 / c system. Both ceramics show ever-improving microstructures with the increasing sintering temperature . The optimal microwave dielectric properties ( ε r = 9.2, Qf = 66,000 GHz, τ f =–85 ppm/°C for SrGa 2 O 4 and ε r = 10.6, Qf = 15,400 GHz, τ f =–58 ppm/°C for CaGa 2 O 4 ) are obtained when sintered at 1275 °C. A patch antenna is fabricated using SrGa 2 O 4 ceramics as the substrate, which realizes a return loss of –19.94 dB and total efficiency of –1.38 dB (72.8 % in power ratio) at 4.84 GHz. The exceptional performances indicate that SrGa 2 O 4 ceramics are promising candidates for antenna applications at the Sub-6 GHz band.
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
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