JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Jin Fang,Minmin Mao,Yuxuan She,Yutao Yang,Yingjie Ren,Hadi Barzegar Bafrooei,Mahdi Feizpour,Alexander Korotkevich,Viktor Sergeevich Leontev,Mikhail P. Kuz'min,Shuqing Song,Weiquan Zhang,Kaixin Song
MgSiO 3 ceramics hold promise for millimeter-wave applications owing to their low relative permittivity and cost-effectiveness, but their performance is limited by polymorphism and phase transitions. To mitigate these challenges, we strategically introduced Ge 4 + ions to stabilize the orthoenstatite (OEN) phase and prepared MgSi 1- x Ge x O 3 ceramics via a solid-state method. X-ray diffraction (XRD) and Raman spectroscopy confirmed a phase transition from clinoenstatite (CEN) to OEN with increasing Ge 4+ concentration, resulting in a predominantly OEN phase at x ≥ 0.15. Scanning Electron Microscopy (SEM) revealed that Ge 4+ influenced grain size, uniformity and density. The relative permittivity ε r increased from 6.07 ± 0.11–7.10 ± 0.09 with increasing x , while the temperature coefficient τ f decreased monotonically. Optimal Q × f values of 140,000 ± 11,000 GHz at 13.1 GHz and 216,880 ± 12,840 GHz at 24.4 GHz were achieved at x = 0.15. After one year, the microwave dielectric properties remained robust, underscoring the potential of MgSiO 3 for practical millimeter-wave applications.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shu-An Ye,Maolong Qiao,Yuanlu Xu,Jiaying Yan,Chenglong Li,Renjia Yuan,Ziyi Xiong,Guohao Xie,Yi Xiong,Xiaoming Zhang,Kang Du
In this work, a series of Na (1- x ) Ca (1+ x ) Ga (1+ x ) Si (2- x ) O 7 (0 ≤ x ≤ 0.9) ceramics were successfully prepared via the conventional solid-state reaction method, achieved the synergistic substitution of Ca 2+ for Na + and Ga 3+ for Si 4+ in NaCaGaSi 2 O 7 ceramic. The crystal structure evolution, microwave dielectric properties, and structure-performance relationships of the Na (1- x ) Ca (1+ x ) Ga (1+ x ) Si (2- x ) O 7 ceramics were systematically characterized by multiple analytical techniques including XRD Rietveld refinement, XPS, far-infrared spectroscopy, and first-principles calculations. The synergistic dual-ion substitution effectively optimized the microstructure of NaCaGaSi 2 O 7 -based ceramics, suppressed the formation of oxygen vacancy defects, and modulated the chemical bonding characteristics, thereby significantly improving the comprehensive microwave dielectric performances. Notably, the Na (1- x ) Ca (1+ x ) Ga (1+ x ) Si (2- x ) O 7 ( x = 0.7) ceramic achieved excellent comprehensive properties: ε r = 9.01, a high Q×f value of 31049 GHz, and a small negative τ f value of −13.36 ppm/°C. Furthermore, a high-gain dielectric patch antenna fabricated using the optimized ceramic substrate achieved a peak gain of 10.66 dBi and a maximum radiation efficiency of 85.68% at 13.63 GHz, verifying the great application potential of Na (1- x ) Ca (1+ x ) Ga (1+ x ) Si (2- x ) O 7 ceramics for Ku-band communication applications.
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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
·
固体物理
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MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Bo Li,Hansheng Leng,Wei Liu
A new low-temperature sintered microwave ceramic Ca 5 Ni 2 Mg 2 V 6 O 24 (CNMVO) was synthesized by a solid-state reaction method. The effect of sintering process on microstructures and microwave properties of CNMVO ceramics was investigated in detail. XRD results and EDS analyses show that CNMVO ceramics sintered at 850–925 °C are the uniform solid solution with a stable cubic garnet structure. The CNMVO ceramic sintered at 875 °C has the highest Q × f value and is accompanied by the volatilization of vanadium observed by SEM . TG curves demonstrate that the increase of heating rate weakens the vanadium loss. According to the Raman spectra , the Q × f value reaches the maximum value at a heating rate of 2 °C/min, because of the highest cation ordering degree and the densest packing fraction caused by the properly deficient vanadium. As a result, the Ca 5 Ni 2 Mg 2 V 6 O 24 ceramic sintered at 875 °C with a heating rate of 2 °C/min exhibits the best microwave properties: ε r = 8.07, Q × f = 60,613 GHz, and τ f = −32 ppm/°C.
研究领域:
材料科学
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陶瓷
·
微波工程
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaomeng Ma,Jialun Du,Xueli Ji,Lintao Liu,Haitao Wu,Hideo Kimura,YiZhong Lu,Zhenxing Yue
In this work, Nd 2 (Zr 1- x Sn x ) 3 (MoO 4 ) 9 (0.02 ≤ x ≤ 0.1) (NZSM) ceramics were successfully obtained through conventional solid-state route. Phase analysis, microstructure, and properties were investigated scientifically by XRD , SEM, and network analyzer, respectively. XRD results revealed that all samples with different substitution amounts of Sn 4+ formed the pure phase with R-3c space group. The permittivity was related to the polarizability and the bond of Zr2-O5, the bond of Nd-O2 possessed a positive influence on Q×f . The reduced octahedral distortion and increased bond energy made the temperature coefficient more stable. Infrared reflection spectrum results showed that the permittivity was mainly caused by the absorption of phonon oscillation. The optimum properties ( ε r = 10.34, Q×f = 74,795 GHz, τ f = −13.55 ppm/°C) were obtained when x = 0.02 sintered at 750 °C.
研究领域:
材料科学
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陶瓷
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微波介电材料
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固态化学
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhuo Xing,Chi Ma,Juhai Weng
Dense LiCuVO 4 ceramics with a relative density of 95% were facilely fabricated using a conventional solid-state method at low temperatures (∼660 °C). Promising microwave dielectric properties were obtained with a moderate relative permittivity ( ε r ) of 16.9 ± 0.3 and a quality factor ( Q × f ) of 15,200 ± 300 GHz, but poor temperature stability of the resonance frequency (τ f ∼ −61.5 ± 3 ppm/°C). To compensate for the negative τ f value, rutile TiO 2 with a positive τ f value was added to form a series of composite ceramics (1- x )LiCuVO 4 - x TiO 2 . As regards, a zero-close τ f value (∼−1.4 ppm/°C) was achieved at x = 0.6 compositions with an ε r of 18.6 ± 0.3 and a Q × f of 18,000 ± 400 GHz. Additionally, the LiCuVO 4 ceramic has good chemical compatibility with silver electrodes. All results support the prospective applications of LiCuVO 4 in low-temperature cofired ceramics (LTCC) as substrates.
研究领域:
材料科学
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电气工程
·
陶瓷
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 4
·318
·
IF 3.2
Su Xiuyuan,Chen Yuan-Bin,Tang Ruxuan
Based on the Na 0.48 La 0.52 MoO 4 ceramic, this study replaced La 3+ ions with Nd 3+ ions through ion substitution, which significantly increased the Q × f of Na 0.48 La 0.52 MoO 4 and reduced the sintering temperature. The good sintering state of this series of ceramics was demonstrated by scanning electron microscopy (SEM) and density tests. X-ray diffraction (XRD) and Raman spectroscopy results revealed the formation of solid solutions without the presence of secondary phases or impurities. The P–V–L theory indicated that the Na/La/Nd–O bond-to-bond ionicity (fi) contribution was dominant, while the Mo–O bond also played a significant role in the lattice energy ( U ), bond energy ( E ), and thermal expansion coefficient ( α ). Among them, the Na 0.48 La 0.48 Nd 0.04 MoO 4 ceramic achieved the best dielectric performance at 900 °C, with ɛ r = 11.027 ± 0.018, Q × f = 113,805 ± 6,358 GHz, and τ f = − 23.36 ppm/℃. Through ion substitution, these materials all have low sintering temperatures and high Q × f values, making them ideal candidates for low-temperature co-fired ceramics (LTCC).
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 36
·16909-16917
·
IF 3.5
Xie Jingru,Fu Zhifen,Cheng Qing,Chen Chen,She Yubin,Li Xiangyi
Low temperature co-fired ceramics (LTCC) technology is extensively utilized to meet the requirements of device integration and miniaturization. Low-fired Li 3 Mg 2 NbO 6 ceramics doped with x wt% Li 2 O–MgO–B 2 O 3 –CaF 2 –SiO 2 glass (LMBCS, x = 0.5, 1.0, 1.5, 2.0) were prepared by the solid-state reaction method for applications in microwave communication materials. All samples exhibited a single-phase Li 3 Mg 2 NbO 6 structure. The addition of LMBCS glass effectively reduced the sintering temperature of Li 3 Mg 2 NbO 6 ceramics from 1250 °C to 875 °C. And adding LMBCS glass improved the Q × f value of Li 3 Mg 2 NbO 6 ceramics. The Li 3 Mg 2 NbO 6 -1.0wt% LMBCS ceramics exhibited outstanding microwave dielectric properties: ε r = 16.8, Q × f = 89,495 GHz, τ f = − 27.4 ppm/°C at 875 °C, which indicates that this ceramic is potential candidate materials for LTCC.
研究领域:
材料科学
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电子陶瓷
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功能材料
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无机非金属材料
·
微波通信材料
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Min Yang,Yong Zheng,Weimin Ding,Xuepeng Lu,Zhiyi Jiang,Bo Li,Zuowei Dong,Wei Zhou
To explore high-performance dielectric ceramics with intrinsically low sintering temperatures and low permittivity suitable for use in the microwave (MW) and terahertz (THz) ranges, Cu ions were selected to replace Zn ions in BaZnP 2 O 7 ceramics based on the considerations of ionic radius and chemical bond characteristics. Samples with moderate Cu 2+ substitution exhibited better performance than conventional ones, with a similar dielectric mechanism in both MW and THz frequency ranges. All samples of BaZn 1- x Cu x P 2 O 7 (0 ≤ x ≤ 0.1) solid solutions exhibit a single-phase with a triclinic structure ( P-1 ) when the sintering temperature is below 925 °C, while the BaCuP 2 O 7 phases form in the doped samples at 925 °C. Cu 2+ substitution improves density and enhances molecular polarizabilities and average ionicity, thereby raising the dielectric constant ε r . The substitution of Cu 2+ for Zn 2+ in BaZnP 2 O 7 ceramics shortens the chemical bonds, thus improving lattice stability and reducing the damping factor of phonon anharmonic vibrations. This, in turn, increases the Q × f values by 1.65 times and enhances temperature stability compared to conventional ceramics. The BaZn 1- x Cu x P 2 O 7 ceramics have good chemical compatibility with Cu, but react with Ag.
研究领域:
材料科学
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陶瓷
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介电材料
·
固体物理
·
微波技术
·
太赫兹技术
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Mingjia Lu,Xin Ouyan,Songping Wu,Rongyun Ge,Rui Xu
Self-assembled porous ZnGa 2 O 4 particles were synthesized through a facile hydrothermal route in this work. The phase evolution and microstructure of specimens were identified by XRD and SEM. Various morphologies (i.e. porous, nanorods or spherical particles) and size (nano or micro-sized) could be rationally designed through altering the reaction conditions. Hydrothermal ZnGa 2 O 4 particles exhibited an outstanding microwave dielectric performance, i.e. a dielectric constant of 9.93, a Q × f value of 73 000 GHz, and a τ f value of –68.7 ppm/ °C. What is more, the ZnGa 2 O 4 ceramics displayed a stable quality factor in the high temperature region (1400–1500 °C) due to the unique frame-structured ZnGa 2 O 4 particles. Therefore, they can be regarded as potential candidate materials for millimeter-wave device.
研究领域:
材料科学
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微波工程
·
化学合成
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yucheng Cao,Liangbin Zhang,Hongrong Mei,Zhenggang Rao,Tingfang Tian,Chunchun Li
The monoclinic diopside structured CaMgGe 2 O 6 dielectric ceramics were synthesized by the traditional solid-phase reaction method, and their microwave dielectric properties were characterized. X-ray diffraction (XRD) and Rietveld refinement revealed that CaMgGe 2 O 6 belongs to the monoclinic system of space group C2/c. SEM images showed that dense CaMgGe 2 O 6 ceramics could be formed at the optimum sintering temperature of 1300 °C. Typically, ceramic sintered at 1300 °C for 6 h possessed outstanding microwave dielectric properties with ε r ∼7.96, Q × f ∼41,280 GHz, and τ f ∼ −46.6 ppm/°C. Far-infrared spectra analysis revealed the intrinsic microwave dielectric properties of CaMgGe 2 O 6 ceramics. These findings demonstrate promising application prospects of CaMgGe 2 O 6 in microwave substrate materials.
研究领域:
材料科学
·
陶瓷
·
微波工程
·
介电材料
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高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 57
·期 1
·015301
·
IF 3.4
Xiao Zhang,Zhe Xiong,Bin Tang,Chengtao Yang
The rapid advancement of mobile communications technology is imposing greater demands on electronic components. Microwave dielectric ceramics with a high dielectric constant (r) are crucial for the miniaturization and integration of microwave devices. Herein, The perovskite-structured (Ca0.61Nd0.26)1−x(Li0.5Nd0.5)xTiO3 (0 ⩽ x ⩽ 0.8) microwave dielectric ceramics with high r value were prepared by solid-state reaction method. The results demonstrated that the r value reached its peak at x = 0.6, which was influenced by the bond valence at B-sites. The τf and Q× f values decreased with increasing x value. Doping (Li0.5Nd0.5)2+ at A-sites led to an increase in the full width at half maximum of Raman peaks, indicating higher internal loss. A high dielectric constant and temperature-stable (Ca0.61Nd0.26)0.27(Li0.5Nd0.5)0.73TiO3 ceramic can be sintered with good microwave dielectric properties of r = 129.4, Q× f= 2,787 GHz, and τf = +1.9 ppm/°C.
研究领域:
材料科学
·
电气工程
·
微波技术
·
陶瓷
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高影响因子
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