Active and Passive Electronic Components
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2019
·
IF 0
Yanfeng Shi,Yongqiang Chai,Shengbo Hu
A novel LTCC substrate manufacturing process based on 3D printing was investigated in this paper. Borosilicate glass-alumina substrates with controlled size and thickness were successfully manufactured using a self-developed dual-nozzle hybrid printing system. The printing parameters were carefully analyzed. The mechanical and dielectric properties of the printed substrate were examined. The results show that the printed substrates obtain smooth surface (Ra=0.92 μm), compact microstructure (relative density 93.7%), proper bending strength (156 mPa), and low dielectric constant and loss (Ɛr=6.2, =0.0055, at 3 GHz). All of those qualify the printed glass–ceramic substrates to be used as potential LTCC substrates in the microwave applications. The proposed method could simplify the traditional LTCC technology.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jinxin Bi,Yunjuan Niu,Haitao Wu
Low-loss novel Li 4 Mg 3 Ti 2 O 9 dielectric ceramics with rock-salt structure were prepared by a conventional solid-state route. The crystalline structure, chemical bond properties, infrared spectroscopy and microwave dielectric properties of the abovementioned system were initially investigated. It could be concluded from this work that the extrinsic factors such as sintering temperatures and grain sizes significantly affected the dielectric properties of Li 4 Mg 3 Ti 2 O 9 at lower sintering temperatures, while the intrinsic factors like bond ionicity and lattice energy played a dominant role when the ceramics were densified at 1450 °C. In order to explore the origin of intrinsic characteristics, complex dielectric constants ( ε ’ and ε ’’ ) were calculated by the infrared spectra, which indicated that the absorptions of phonon oscillation predominantly effected the polarization of the ceramics. The Li 4 Mg 3 Ti 2 O 9 ceramics sintered at 1450 °C exhibited excellent properties of ε r =15.97, Q· f =135,800 GHz and τ f =−7.06 ppm/°C. In addition, certain amounts of lithium fluoride (LiF) were added to lower the sintering temperatures of matrix. The Li 4 Mg 3 Ti 2 O 9 −3 wt% LiF ceramics sintered at 900 °C possessed suitable dielectric properties of ε r =15.17, Q· f =42,800 GHz and τ f =−11.30 ppm/°C, which made such materials promising for low temperature co-fired ceramic applications (LTCC).
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Fangyi Huang,Hua Su,Yulan Jing,Yuanxun Li,Qihai Lu,Xiaoli Tang
Herein, glass-free microwave dielectric ceramics CaMg 0.9-x Li 0.2 Zn x Si 2 O 6 (x = 0–0.36) with excellent microwave dielectric properties were prepared via traditional solid-state reaction method. Phase composition and crystalline structure were identified using X-ray diffraction (XRD), which confirmed that the ceramics contained more than one phase. Rietveld refinement method was utilized to analyze XRD data and obtain structural information, such as lattice parameters. SEM photographs showed that Zn 2+ substitution could effectively promote densification of the ceramics. Microwave dielectric properties were obviously influenced by the combination of multiple phases. Combined with Raman spectra, influences of Raman shift and FWHM of vibration peaks on microwave dielectric properties were determined. The CaMg 0.9-x Li 0.2 Zn x Si 2 O 6 ceramic exhibited high performance at x = 0.28 with: Q × f = 68,190 GHz, ε r = 7.51 and τ f = −68 ppm/°C, when sintered at 900 °C. The studied ceramics are promising candidates for LTCC application.
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
Materials
·
2025
·Vol. 18
·期 4
·857
·
IF 3.2
Tiange Xue,Xinqing Su,Shixiang Yu,Meng Meng,Xinya Xu,Jinqi Xin,Jinjin Ran
In this work, a small amount of AlN whiskers (ranging from 2 wt.% to 8 wt.%) was incorporated into CaO-MgO-ZnO-B2O3-SiO2(CMZBS)–glass/Al2O3composites so as to obtain glass-ceramics with a thermally conductive network through sintering between 700 °C and 1000 °C. Special attention was given to the densification behavior, dielectric properties, and thermal conductivity of CMZBS/Al2O3/AlN–glass–ceramic composites with varying AlN whisker contents. According to the results, composites with desirable thermal, mechanical, and dielectrical properties were successfully fabricated. Notably, the composites containing 6 wt.% AlN whiskers, sintered at 800 °C, exhibited the most optimal comprehensive properties (dielectric constant of 7.06, dielectric loss of 383 × 10−5, thermal expansion coefficient of 6.40·10−6/K, flexural strength of 180 MPa, and thermal conductivity of 5.17 W/(m·K)). Given these attributes, this CMZBS/Al2O3/AlN composite holds great potential for applications in LTCC (low-temperature co-fired ceramic).
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
Materials Today Communications
·
2023
·
IF 3.8
Zhuo Xing,Juhai Weng,Chi Ma
A series of Zn 2- x Cu x GeO 4 ceramics were prepared by the solid-phase sintering method. Cu 2+ substitution for Zn 2+ facilitated the single-phase formation and benefited densification via lowering the sintering temperatures , hence thereby the microwave dielectric properties were largely improved. A representative composition with x = 0.08 revealed a homogenous Zn 2 GeO 4 phase with good microwave dielectric properties: ε r ∼ 7.47, Q × f ∼ 56,980 GHz, and τ f ∼ −13.9 ppm/°C when sintered at 1000 °C. To evaluate the potential application of low-temperature cofired ceramics (LTCC), sintering aids (B 2 O 3 ) were added to the x = 0.08 sample to reduce its sintering temperature to below 960 °C. A dramatic improvement in Q × f ∼ 107,415 GHz was observed with only 0.5 wt % B 2 O 3 addition. Chemical compatibility was confirmed via cofiring with silver electrodes at 940 °C. All the merits show promising potential for advanced substrates.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 22
·17814-17827
·
IF 2.779
Liu Zhuofeng,Liang Wenxue,Zhang Weijun,Wang Fenglin,Xun Yan,Chen Tongting,Li Wei,Chen Xingyu,Mao Haijun
The co-firing compatibility between green tape and the Ag electrode is a crucial characteristic in low-temperature co-fired ceramic (LTCC) technology and plays a vital role in improving the performance and application status of LTCC device modules. In this work, we studied the effects of lead content on the glass viscosity, the microstructure, and co-firing compatibility of silver electrode film. It was found that the softening point and viscosity of the glass were decreased, and the wettability between the glass and silver was improved with the increase of the lead content, which promoted the co-firing densification and interfacial bonding between the silver electrode film and the ceramic layer. The film presented the best electrical properties co-firing at 875 °C for 15 min, with the resistivity of 1.21 mΩ/sq. And the film was densified. The sintering interface was clear and well bonded. The results showed that an appropriate lead content in glass could effectively improve the interfacial bonding and the electrical properties during co-fired process, providing a new control methodology for realizing co-fired matching of the silver electrode film with low-temperature co-fired ceramics.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xinyuan Lyu,Luchao Ren,Le Xin,Zhengxin Li,Xianxin Zhang,Zheng Luo,Pengchao Shao,Yuxiao Zhang,Panpan Lyu,Mingwei Zhang
Fabrication of low-temperature co-fired ceramic (LTCC) densified at a low sintering temperature (<900 °C) is energy saving and environmentally friendly. Here, an interesting attempt has been made to lower the sintering temperature of MgGa2O4 by adding CuMoO4 for LTCC application. The sintering temperature of MgGa2O4 was remarkably reduced from 1410 to 900 °C, which contributed to energy saving. Furthermore, a series of studies on microstructure, sintering behavior, lattice parameters, and microwave dielectric characteristic of the samples were carried out. The occurrence of ion substitution between MgGa2O4 and CuMoO4, which affected the sintering densification, ionic polarizability, and Mg–O bond length, made the composites present various sintering and dielectric properties. Moreover, the full width half maximum (FWHM) value of the T2g peak in Raman spectra and lattice distortion were also analyzed to reveal the intrinsic interaction between structure and dielectric properties. Finally, the 0.5MgGa2O4–0.5CuMoO4 ceramics sintered at 900 °C showed the best comprehensive performance, εr = 6.8, Q × f = 15,800 GHz, τf = −54.2 ppm/°C. These promising properties make the composite more suitable for practical application.
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 ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 4
·1731-1737
·
IF 2.2
Chen Minshu,Li Yuanxun,Li Fuyu
Here, Ca 5 Mn 4− x Ni x V 6 O 24 (CMNVO, x = 0.00–0.08) ceramics are successfully prepared by the solid-phase reaction method, and the connection between the physical phase information, microscopic morphology, Raman spectroscopy, and microwave dielectric properties is explored. The experimental results show that Ni 2+ occupies the Mn 2+ sites without altering the crystal structure and is effectively solid-solvated into the lattice. The relative density reaches a maximum value of 95.9% when the temperature (Tem.) = 900°C and x = 0.06. The trend of the dielectric constant ( ε r ) depends on the ionic polarization rate, and the quality factor ( Q×f values) are correlated with the microstructure and relative density. The maximum value of 43,800 GHz is reached at Tem. = 900°C and x = 0.06, and the temperature coefficient of resonant frequency ( τ f values) is enhanced from −75 ppm/°C to −52 ppm/°C. The CMNVO ( x = 0.06) ceramic obtains better microwave dielectric properties ( ε r = 11.4, Q×f = 43,800 GHz, and τ f = −52 ppm/°C). This ceramic material is expected to be a candidate for low-temperature co-fired ceramic (LTCC) microwave devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Shuai Li,Chen Li,Minmin Mao,Kaixin Song,Yaseen Iqbal,Amir Khesro,Sinan S. Faouri,Zhilun Lu,Bing Liu,Shikuan Sun,Dawei Wang
In this work, Zn-Ni co-modified LiMg 0.9 Zn 0.1- x Ni x PO 4 ( x = 0–0.1) microwave dielectric ceramics were fabricated using a solid state synthesis route. Rietveld refinement of the XRD data revealed that all ceramic samples have formed a single phase with olivine structure. SEM images showed that the samples have a dense microstructure, that agrees with the measured relative density of 97.73 %. Based on the complex chemical bond theory, Raman and infrared reflectance spectra, we postulate that ε r is mainly affected by the ionic polarizability, lattice and bond energy, while P-O bond plays a decisive role in Q×f and τ f value. Optimum properties of Q×f ~ 153,500 GHz, ε r ~ 7.13 and τ f ~ −59 ppm/°C were achieved for the composition LiMg 0.9 Zn 0.06 Ni 0.04 PO 4 sintered at 875 ℃ for 2 h. This set of properties makes these ceramics an excellent candidate for LTCC , wave-guide filters and antennas for 5 G/6 G communication applications.
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
Crystals
·
2022
·Vol. 12
·期 4
·512
·
IF 2.67
Zhijian Wang,Feng Pan,Lanlan Liu,Qifeng Du,Ruitao Tang,Jun Ai,Hong Zhang,Ying Chen
Mg2SiO4holds promise for its application in the microwave communication field due to its low dielectric constant and highQ×fvalue. However, its high negativeτfand high sintering temperature limit its application in low-temperature co-fired ceramic (LTCC) devices. In this work, Li2TiO3and CaTiO3were introduced to improve theτf, and LiF was chosen to decrease the sintering temperature. According to XRD patterns and SEM micrographs, the ceramic systems displayed a complex-phase structure, and the microstructure was densified when CaTiO3was added. All of the relative densities, dielectric constants, andQ×fvalues first increased and then decreased as the sintering temperature increased. The MLLC11.5 ceramics sintered at 800 °C could be obtained with the highestQ×fvalue of 54,581 GHz (at 8.06 GHz),εrof 14.13, andτfof + 5.81 ppm/°C. Furthermore, it was proven that the MLLC11.5 powders could be co-fired without any reaction with Ag powders at 800 °C, indicating its potential for LTCC application. The MLLC11.5 composition was used to prepare a GPS antenna and showed good prospects for its application in electronic communications.Keywords:Mg2SiO4-Li2TiO3-LiF-CaTiO3ceramics;structure;microwave dielectric property;LTCC;antenna
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Xinglong Liu,Zexing Wang,Xinyao She,Quanliang Jia,Jiamao Li
In this study, LiF was utilized to decrease sintering temperature , improve microstructure, enhance Q × f , and regulate τ f of Li 2 Ti 0.9 (Zn 1/3 Ta 2/3 ) 0.1 O 3 (abbreviated as LTZT) ceramics. A complete solid solution together with a phase transition from monoclinic to cubic rock salt structure occurred. The cell volume of LTZT ceramics decreased as the LiF content increased. Relatively dense and uniform microstructures were observed for the ceramics as the LiF content was not less than 2 wt%. The dielectric constant of LTZT ceramics initially increased and then decreased with the increasing LiF content. The FWHM of the Raman band at about 808 cm −1 was closely related to the Q × f value. Notably, the samples with 3 wt% LiF exhibited the highest relative density of 97.4 % and satisfactory microwave dielectric properties of ε r = 23.14 ± 0.16, Q × f = 110,090 ± 1100 GHz, and τ f = +3.25 ± 1.45 ppm/°C when sintered at 950 °C. Good chemical compatibility with silver indicated the ceramic is a promising candidate in LTCC applications.
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
·
2023
·
IF 5.2
Linzhao Ma,Pengcheng Zhang,Shucheng Liu,Quanzhang Wen,Qianbiao Du,Hao Li
The solid-state method was used to prepare LiZn 4 V 3 O 12 ceramics. The phase composition, crystal structure and micromorphology of ceramics were studied in detai. The XRD data and rietveld refinement revealed that LiZn 4 V 3 O 12 ceramics were composed of LiZnVO 4 and Zn 3 V 2 O 8 , with a content ratio of 1:3. The results indicate that the ε r and Q × f value of LiZn 4 V 3 O 12 ceramics were related to the relative density. When the LiZn 4 V 3 O 12 ceramics sintered at, 720 °C for 4 h, possessed a high relative density (96.71%), a low ε r value (11.51), a high Q × f value (53891 GHz (11.5 GHz)), and a negative τ f value (−25.58 ppm/°C). The XRD and SEM analyses have demonstrated that LiZn 4 V 3 O 12 ceramic can coexist with the Ag electrode, indicating there is the great potential for application in the field in LTCC application.
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
危险品化学品经营许可证（带存储）