JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Haonan Cui,Hongcheng Yang,Hua Wang,Yixuan Zheng,Yuchen Wang,Hongyu Yang,Enzhu Li
CaO-Al 2 O 3 -B 2 O 3 (CAB) glass-ceramics with varying Al 2 O 3 content were fabricated using the melting method including melting and quenching of mixture of raw materials. The obtained glass powder was pressed into the desired shape and sintered for measurement. At 900 °C, the crystallinity initially increased and then decreased with increasing Al 2 O 3 content. The highest crystallinity of 62.29 % was obtained when the Al 2 O 3 content was 0.5 mol%, and exhibited excellent dielectric properties : ε r = 4.35, Q × f = 53,085 GHz, and τ f = –33.95 ppm/°C. The variation of dielectric properties with increasing Al 2 O 3 content is attributed to the crystallinity process. The crystallization process of CAB system was determined by crystallization activation energy , the lowest value of 302.085 kJ/mol corresponds to the highest crystallinity. The crystallization, dielectric properties and sintering behavior of CAB system indicate that CAB system prepared by melting method have promising prospect as new LTCC glass-ceramics.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongwei Yang,Fang Xu,Yulong Liao,Yong Ren,Guixiang Liu,Yan Yang,Xueying Wang,Bo Dai
In this work, we prepared a type of LiZnTiCu ferrite with a large grain size and enhanced magnetic properties at ∼900 °C by substituting Cu 2+ ions and doping LBSCA glass. Rietveld refinement of XRD patterns indicates that the Fe 3+ ions in B sites are partially replaced by the Cu 2+ ions, which causes the monotone increase of lattice constant . SEM results show that the interaction of CuO nanoparticles and LBSCA glass causes two changes in the grain growth of the LiZnTiCu ferrites. The grain growth is suppressed when the amount of CuO nanoparticles is less than a threshold value (x = 0.05 for 900 °C; x = 0.20 for 875 °C). However, when enough CuO nanoparticles are added, the ferrites possess a large and compact microstructure. The variation of magnetic hysteresis ( M - H ) loops confirms that M s follows the Néel's collinear spinel model with the increasing number of CuO nanoparticles (x ≤ 0.25). Finally, a type of LiZnTiCu ferrite (x = 0.15) with uniform large grains (average size >10 μm) and good magnetic parameters (4π M s = 3457.59 G, H c = 224.4 A/m and B s = 236.4 mT) is obtained at ∼900 °C.
研究领域:
材料科学
·
磁学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Kui Liu,Yuran Yang,Gongwen Gan,Gaojie Zou,Yida Lei,Cheng Liu,Zongliang Zheng
This study investigates the effects of TiO 2 doping on the temperature stability and dielectric properties of Li 2.75 MgTiO 4 F 0.75 ceramics for low-temperature co-fired ceramic (LTCC) applications. Li 2.75 MgTiO 4 F 0.75 - x TiO 2 (1 wt% ≤ x ≤ 6 wt%) ceramics were synthesized via solid-state reaction. Among the compositions studied, the sample doped with 5 wt% TiO 2 and sintered at 850 °C exhibited optimal dielectric properties, including a ε r of 16.22, a Q × f of 79,195 GHz at 10.7 GHz, and a near-zero temperature coefficient ( τ f = −7.83 ppm/°C). Analysis revealed that LiF, which did not form part of a solid solution, aided densification and improved dielectric properties. However, the high dielectric loss of TiO 2 led to a decrease in the Q × f value. Terahertz frequency measurements further confirmed the system’s potential for terahertz communication applications, with ε r ≤ 13.7 and a tan δ between 0.01 and 0.1. Additionally, the ceramics demonstrated good chemical compatibility with Ag electrodes. These results highlight the promising application of Li 2.75 MgTiO 4 F 0.75 -5 wt%TiO 2 composite ceramics in LTCC technology.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 19
·14901-14905
·
IF 2.019
Cheng L.,Pan H. L.,Li M. F.,Ling F.,Wu H. T.
Li 2 Mg 3 ZrO 6 (LMZ) ceramics doped with 1–5 wt% LiF were prepared by the conventional solid-state reaction method. The influences of LiF addition on the phase compositions, micro-structure, sintering behavior and microwave dielectric properties of LMZ ceramics were explored. A small quantity of LiF addition could obviously reduce the sintering temperature to 950 °C while maintaining the excellent dielectric properties. The optimized quality factor values for different doping components firstly increased and then decreased with the increase of the LiF content, whereas the optimized dielectric permittivity increased with the increase of the LiF content. LMZ ceramics sintered at 950 °C doped with 4 wt% LiF additives possessed the excellent microwave dielectric properties of ε
r
= 12.66, Q · f = 89,325 GHz and τ
f
= −14.46 ppm/°C, which demonstrated that the materials were promising for the low temperature co-fired ceramics applications.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 11
·7474-7478
·
IF 1.676
Qing Zhenjun,Li Haiyan,Zhao Chenglin
A microwave dielectric BaCu 2 V 2 O 8 ceramic with a low intrinsic sintering temperature was synthesized by a solid-state sintering process. The influences of sintering process on the crystal phase composition, microstructure, relative density, and microwave dielectric properties of BaCu 2 V 2 O 8 ceramic were studied utilizing scanning electron microscopy and an x-ray diffractometer. The crystalline phase of BaCu 2 V 2 O 8 was the only one phase found in ceramic. The sample fired at 740°C for 6 h had the optimal microwave dielectric properties ( ε r = 13.5, Q × f = 46,300 GHz and τ f = − 41.5 ppm/°C). The results mean that electronic devices fabricated by low temperature co-fired ceramic technology based on BaCu 2 V 2 O 8 ceramic have potential applications in the high-frequency field.
研究领域:
材料科学
·
电子工程
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 3
·1817-1822
·
IF 2.019
Wang Zixing,Yuan Changlai,Zhu Baohua,Feng Qin,Liu Fei,Miao Lei,Zhou Changrong,Chen Guohua
A novel microwave dielectric ceramics Bi(Sc 1/3 Mo 2/3 )O 4 with low firing temperature were prepared via the solid reaction method. The specimens have been characterized using scanning electron microscopy, X-ray diffraction, Raman spectroscopy and DC conductivity. The Bi(Sc 1/3 Mo 2/3 )O 4 ceramics showed B-site ordered Scheelite-type structure with space group C2/c. Raman analysis indicated that prominent bands were attributed to the normal modes of vibration of MoO 4
2− tetrahedra. The dielectric loss of Bi(Sc 1/3 Mo 2/3 )O 4 ceramics can be depended strongly the bulk conductivity by DC measurement. The superior microwave dielectric properties are achieved in the Bi(Sc 1/3 Mo 2/3 )O 4 ceramic sintered at 875 °C/4 h, with dielectric constant ~ 25, Q × f ~ 51,716 GHz at 6.4522 GHz and temperature coefficient of resonance frequency ~ − 70.4 ppm/°C. It is a promising microwave dielectric material for low-temperature co-fired ceramics technology.
研究领域:
材料科学
·
电子工程
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Gongwen Gan,Jie Luo,Yue Cheng,Zongliang Zheng,Kui Liu,Ziming Li,Guoqing Gou
The atomic scale variation of tantalum ion doped Li 4 NbO 4 F ceramics is initially predicted through first principle calculations. Subsequently, Li 4 Nb (1- x ) Ta x O 4 F (0.00 ≤ x ≤ 0.10) ceramics are prepared using the solid phase reaction method. After sintering at 875 °C for 4 h, the Li 4 Nb 0.96 Ta 0.04 O 4 F ceramics exhibit optimum dielectric properties : ε r = 14.73 ± 0.19, Q × f = 83,439 ± 2810 GHz (@9.31 GHz, improved by 41 %), τ f = - 28.33 ± 1.36 ppm/°C. Both the increase in relative density from 95.9 ± 0.32 % to 96.2 ± 0.34 % and the increase in grain size from 14.9 μm to 15.6 μm are non-intrinsic factors that contribute to the optimization of the dielectric properties. Instead, the internal factors suggest that the primary cause of the gradual decrease in ε r is the redshift of the Raman wave number. The reduction in dielectric loss is attributable to the weakening of damping behavior, as well as the increase in lattice energy and electron cloud density. Finally, promising potential of Li 4 Nb 0.96 Ta 0.04 O 4 F ceramics for low-temperature co-fired ceramic (LTCC) applications is indicated by their favourable chemical compatibility with Ag electrodes.
研究领域:
材料科学
·
电子工程
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高影响因子
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
·
电子陶瓷
·
功能材料
·
无机非金属材料
·
微波通信材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yuanyuan Lv,Lan Zhang,Shuquan Yang,Zhihua Wang,Lin Chen,Jun Sun,Xiaoxiao Li,Jianjun Ding,Kang Zheng,Yi Gong,Xian Zhang,Xingyou Tian
The effect of graphene nanoplatelets (GNPs) on the thermal conductivity of low temperature co-fired ceramic (LTCC) materials based on ZnO–B 2 O 3 –Na 2 CO 3 –Al 2 O 3 –SiO 2 (ZBNAS) glass/Al 2 O 3 composites sintered at 850 °C for 2 h were systematically investigated. The sintered sheets were prepared by standard tape casting process and solid phase sintering . The microstructure and phase composition of the sintered sheets were characterized by SEM and XRD, respectively. With the addition of 0.75 wt% GNPs, the thermal conductivity of the sintered sheet was increased from 3.91 to 7.85 W/(m·K). Meanwhile, the 0.75 wt% GNPs-Al 2 O 3 -ZBNAS glass (GNPs(0.75)/Al 2 O 3 /ZBNAS) composite achieved low dielectric constant of 5.16 and dielectric loss of 0.13 at 18 GHz. The coefficients of thermal expansion (CTE) of the sintered sheets decrease first and then increase. The CTE of GNPs(0.75)/Al 2 O 3 /ZBNAS composite is −7.13 × 10 −6 °C −1 and 3.20 × 10 −6 °C −1 at low temperature (25–80 °C) and high temperature (80–200 °C), respectively. The obtained graphene-based LTCC materials are promising candidates in terms of the potential application of electronic devices with high thermal conductivity requirement.
研究领域:
材料科学
·
电子工程
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 11
·7438-7446
·
IF 2.1
Li Yingxiang,Liang Deyin,Zhang Xing,Xiong Zhe,Qing Zhenjun,Peng Sen,Tang Bin,Si Feng,Fang Zixuan,Wang Fei,Liao Tingting,Chen Jingjing
The structural characteristics and microwave dielectric properties of SrBi 2 TeO 7 ceramics intended for low-temperature co-fired ceramic (LTCC) applications were investigated. Comprehensive analyses were conducted using x-ray diffraction, structural refinement, transmission electron microscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy. The findings demonstrated that SrBi 2 TeO 7 ceramics possess a pure cubic structure. Scanning electron microscopy characterizes the grain microstructure, revealing a relative density of 95.5% for SrBi 2 TeO 7 ceramic. Optimal microwave dielectric properties were achieved for SrBi 2 TeO 7 ceramics calcined at 765°C, displaying a relative permittivity ( ε r ) of 24.96, a Q × f value of 25,898 GHz ( f = 6.6 GHz), and a temperature coefficient of resonant frequency ( τ f ) of –80.7 ppm/°C. The combination of low sintering temperature and minimal dielectric loss renders these ceramics advantageous for utilization in LTCC materials.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yanbin Tang,Wanting Yang,Yicheng Yu,Yan Xue,Borui Zheng,Junlin Cai,Jinge Hu,Qiming Zeng,Zhenjun Qing,Liming Li
La 2 (WO 4 ) 3 microwave dielectric ceramics were prepared using a conventional solid-state reaction method. The effects of sintering temperature (875–950 °C) on densification, phase evolution, microstructure, and microwave dielectric characteristics were thoroughly examined. Phase-pure monoclinic La 2 (WO 4 ) 3 ceramics with space group C2/c were obtained. Optimum sintering at 925 °C yielded the highest relative density (96.5%) and uniform microstructure, resulting in excellent properties: relative permittivity ( ε r ) of 10.8, quality factor ( Q × f ) of 21,780 GHz, and temperature coefficient of resonant frequency ( τ f ) of −51.1 ppm/°C. Structure-property correlations were clarified by applying the Phillips–Van Vechten–Levine chemical bond theory. Quantitative analysis revealed that the high Q × f is primarily governed by the exceptionally high lattice energy of W–O bonds (average ∼12,307 kJ/mol), which suppresses anharmonic lattice vibrations. The negative τ f correlates with the lower bond energy of La–O bonds (∼420 kJ/mol) compared to W–O bonds (∼578 kJ/mol). A modified atomic packing fraction model demonstrated strong positive correlation with Q × f values, indicating that intrinsic packing efficiency dominates dielectric loss in near-fully dense ceramics. This work establishes quantitative links between microscopic bond characteristics and macroscopic dielectric performance, providing a theoretical foundation for designing temperature-stable tungstate-based materials for co-fired low-temperature ceramic applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhenjun Qing,Yuexi Zheng,Haiyan Li
A series of Y 3+ -substituted NaSm 1-x Y x (MoO 4 ) 2 (x = 0.05–0.20) ceramics were synthesized via a conventional solid-state method. Y 3+ substitution significantly enhanced the microwave dielectric properties by modulating the crystal structure, microstructure, and chemical bond characteristics. Rietveld refinement confirmed that all samples adopted a single-phase tetragonal scheelite structure (space group I 4 1 /a). Lattice parameters decreased monotonically with increasing x, while the packing fraction increased from 60.80% to 61.00%, indicating lattice densification. All samples achieved relative densities exceeding 95.9%. Notably, Y 3+ doping simultaneously improved the quality factor and temperature stability: Q × f increased from 39,500 GHz to 52,400 GHz, while | τ f | decreased from 38.7 ppm/°C to 22.3 ppm/°C. The optimal properties were obtained at x = 0.20, with ε r = 12.4, Q × f = 52,400 GHz, and τ f = −22.3 ppm/°C. Raman analysis revealed a negative correlation between the FWHM of the ∼886 cm −1 mode and Q × f , confirming reduced lattice anharmonicity. P–V–L bond theory demonstrated that the enhanced ionicity, lattice energy, and bond energy of the Na/Sm/Y–O bonds contributed to the improved ε r , Q × f and | τ f |, respectively. The low sintering temperature of 900 °C makes this composition highly promising for LTCC substrate applications.
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高影响因子
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