CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wengao Pan,Qingping Lin,Lili Xiao,Shihao Feng,Ying Li,Jie Gao,Pengfei Yue,Guoshang Zhang
Perovskite structural LiBaF 3 ceramics with excellent microwave dielectric properties were synthesized using traditional solid-state method. By regulating the sintering temperatures from 600 °C to 675 °C, LiBaF 3 ceramics exhibit tunable dielectric constant ( ε r ) from 12.42 to 13.72, adjustable Q × f value from 55000 GHz to 73000 GHz, and regulable temperature coefficient of resonance frequency ( τ f ) from −36.78 ppm/°C to −34.68 ppm/°C. The properties are strongly associated with the density, and can be further optimized by 0.5 wt%TiO 2 addition ( ε r = 14.43, Q × f = 56000 GHz, τ f = -1.26 ppm/°C). The LiBaF 3 ceramics also exhibit excellent compatibility with Ag and Al electrodes. Furthermore, relationships between multiscale structures and microwave dielectric properties of the ceramics were revealed. Oxidation behaviors between LiBaF 3 and O 2 would result in the lattice shrinkage, the introduction of defect level, the decrease of bandgap and density, and then deteriorating the microwave dielectric properties. All the findings make the LiBaF 3 ceramic a promising candidate for ULTCC application, and may facilitate the development of other novel microwave dielectric materials.
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
·
2024
·
IF 5.8
Chun Tong,Xinlei Shen,Chang Feng,Xia Feng,Haikui Zhu,Lixi Wang
Temperature-stable ULTCC composite (1- x )Li 3 AlMo 3 O 12 - x Li 0.5 Bi 0.5 MoO 4 ceramics were prepared by solid-state reaction method. X-ray and EDS results showed that Li 3 AlMo 3 O 12 phase and Li 0.5 Bi 0.5 MoO 4 phase exist independently, and no other phase is generated. Due to the low sintering temperature of both two phases, the composite ceramics can obtain high density at 560 ℃. Microwave dielectric properties mainly depend on the ceramic Li 0.5 Bi 0.5 MoO 4 content x , the addition of Li 0.5 Bi 0.5 MoO 4 effectively increases the τ f of Li 3 AlMo 3 O 12 from −65.05 ppm/℃ to 4.96 ppm/℃, but caused the dielectric loss increase. When x =0.45 and sintered at 560 ℃, microwave dielectric properties of 0.55Li 3 AlMo 3 O 12 -0.45Li 0.5 Bi 0.5 MoO 4 ceramics with close zero τ f : ε r = 15.32, Q × f = 13,158 GHz, τ f = 4.96 ppm/℃.
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
·
2024
·
IF 5.8
Ruihang Li,Luchao Ren,Le Xin,Pengchao Shao,Jia Wang,Zengli Gao,Panpan Lyu,Cuncheng Li,Hui Peng,Mingwei Zhang
This study optimizes the temperature coefficient of resonant frequency (τ f ) in CuMoO 4 ceramics from −36 to −8.82 ppm/°C through W 6+ B-site substitution. XRD analysis confirms the single-phase structure of CuMo 1- x W x O 4 ceramics, while Rietveld refinements reveal an expansion in lattice parameters. W 6+ substitution slightly reduces the relative permittivity (ε r ) due to the changes in sintering density and ion polarizability. Moreover, the internal effects of W 6+ substitution on the Q×f value are systematically investigated by analyzing the Raman peak's full width at half maximum (FWHM) and conducting packing fraction calculations. Additionally, lattice distortion and bond valence analyses elucidate the intrinsic mechanism behind τ f improvement. Consequently, when x = 0.08, CuMo 1- x W x O 4 sintered at 625°C exhibits superior overall performance: ε r = 5.13, Q×f = 65,506 GHz, τ f = −8.82 ppm/°C. Furthermore, it demonstrates good chemical compatibility with Al electrodes making the material more suitable for ULTCC practical 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
·
2020
·
IF 3.83
Mingyang Yu,Ying Tang,Jie Li,Weishuang Fang,Lian Duan,Liang Fang
Two novel ATeMoO 6 (A = Mg, Zn) ceramics with ultra-low sintering temperature were fabricated through traditional solid-state reaction. Both ceramics have an orthorhombic structure in space group P 2 1 2 1 2, which was indicated by X-ray diffraction. The crystal structure, sintering characteristics, microstructure and microwave dielectric properties were discussed. MgTeMoO 6 ceramic sintered at the ultra-low temperature of 660 °C for 6 h achieved excellent microwave dielectric properties with ε r = 11.93, Q × f = 34,453 GHz and τ f = – 82 ppm/°C, whereas ZnTeMoO 6 had the corresponding performances of ε r = 12.39, Q × f = 29,153 GHz and τ f = – 87 ppm/°C at 650 °C for 6 h. The good chemical stability with Al indicates that ATeMoO 6 (A = Mg, Zn) ceramics may be potential candidates for ultra-low temperature co-fired ceramic technology (ULTCC) applications.
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
·
2024
·
IF 5.8
Mo Wei,Meng Fei Zhou,Bing Liu,Cheng Chao Hu,Yu Hua Cheng,Kai Xin Song
In this work, MgF 2 – x wt%LiF ( x = 0.5, 1.0, 2.5, 4.0, 5.0) ceramics have been prepared through the standard solid-state reaction method. X-ray diffraction patterns and scanning electron micrographs revealed the successful preparation of dense MgF 2 –LiF composite ceramics at an exceptionally low sintering temperature range of 525–600°C. The optimal microwave dielectric properties ( ε r = 5.09 ± 0.03, Qf = 100,733 ± 1646 GHz, τ f = −67.4 ± 3.3 ppm/°C) were achieved in MgF 2 –0.5 wt%LiF ceramics after sintering at 550 °C for 3 h. The present ceramics exhibited an outstanding combination of low- ε r , high Qf , and an ultra-low sintering temperature, surpassing the performance of most low-temperature-fired dielectric materials. Moreover, the theoretical Qf value, extrapolated from the fitting of infrared reflectivity spectra, was calculated to be 326,583 GHz, indicating significant potential for further Qf improvement. Additionally, the chemical compatibility with Al electrodes was confirmed, suggesting promising potential for ultra-low temperature co-fired ceramic (ULTCC) applications.
研究领域:
材料科学
·
陶瓷
·
介电材料
·
微波工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Chen Li,Yahan Liu,Mengjiao Chi,Xinjiang Luo,Bing Liu,Minmin Mao,Hadi Barzegar Bafrooei,Ge Wang,Ehsan Taheri-Nassaj,Kaixin Song
Highly-density Zn 3 B 2 O 6 (ZBO) ceramics were firstly prepared via a two-step cold sintering and ultra-low temperature sintering process (CSP-plus ULTCC post annealing). In this study, pre-densified ZBO ceramics (relative density∼ 92 %) is initially obtained under the condition of 200 ℃/60 min/300 MPa via CSP using acetic acid as a liquid phase, yielding microwave properties of ε r = 5.05, Q × f = 6353 GHz and τ f = −69.51 ppm/℃. After annealing at 550 ℃, relative dielectric properties are significantly improved, resulting in the microwave dielectric properties of ε r = 5.95, Q × f = 20620 GHz, τ f = −67 ppm/℃ achieved in a ZBO ceramics with relative density> 95 %. Many fine grains are observed to precipitate between the larger grains of cold-sintered ZBO ceramics, as evident by SEM images, exhibiting disordered grain and porosity distribution. At contrast, a uniform microstructure with fine grain and less porosity are observed after annealing procedure. The densification process of ZBO ceramics prepared by this method is further investigated to validate cold sintering "dissolution-precipitation" mechanism, as a critical factor, for promoting the densification of ZBO ceramics.
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 THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 12
·8281-8290
·
IF 3.5
Shumin Duan,Zhenjun Qing,An Liu,Haiyan Li,Yan Xue
Ultra-low temperature sintered ceramics, Li 2 (Mg 1− x Ca x ) 2 (MoO 4 ) 3 ( x = 0.025–0.100), were synthesized using the solid-phase method. XRD analysis revealed that adding Ca 2+ increased the second-phase CaMoO 4 content. Particularly, Li 2 (Mg 0.975 Ca 0.025 ) 2 (MoO 4 ) 3 ceramics exhibited excellent properties: ε r = 9.31, Q × f = 55,400 GHz, and τ f = −38.9 ppm/°C. Incorporating Ca 2+ significantly improved the performance of ceramics. The microwave dielectric properties of Li 2 (Mg 0.9 Ca 0.1 ) 2 (MoO 4 ) 3 ceramics sintered at 650°C showed enhancements: ε r of 9.55, Q × f of 63,500 GHz, and τ f of −10.8 ppm/°C. The rise in ε r can be attributed to polarizability, while a higher packing fraction led to a larger Q × f value, and the reduced distortion of the [Li/Mg/CaO 6 ] octahedra enhanced the τ f value. Moreover, the increased of CaMoO 4 also positively influenced the ceramic's properties. Furthermore, in accordance with the principles of complex chemical bonding, the elevation of ionicity, lattice energy, and bond energy of the Mo–O bond contributed to the enhancement of ε r , Q × f , and τ f , respectively. Raman spectroscopy showed a positive correlation between dielectric loss and full width at half maximum of the Raman peak. Good chemical compatibility between silver and Li 2 (Mg 0.9 Ca 0.1 ) 2 (MoO 4 ) 3 ceramic was demonstrated through our co-firing experiment.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Juan Xi,Guohua Chen,Fei Liu,Fei Shang,Jiwen Xu,Changrong Zhou,Changlai Yuan
In view of lead-free low-softening CuO–ZnO–B 2 O 3 –Li 2 O glass, novel glass/Al 2 O 3 ceramic composites were prepared by solid-state reaction route for ultra-low temperature co-fired ceramic (ULTCC) applications. The phase evolution and compositions, microstructure and microwave dielectric properties of the composites were studied by XRD , SEM and dielectric property measurement. Four phases including Cu 2 Al 6 B 4 O 17 , Li 2 CuB 4 O 8 , CuB 2 O 4 and Al 2 O 3 coexist in the glass/Al 2 O 3 ceramic composites sintered in the range of 640–660 °C. However, the contents and types of the phases depend on the composition of the composites and firing temperature. The optimum properties with a permittivity ε r = 3.79, a quality factor Q × f = 38557 GHz (at 16.64 GHz) and a temperature coefficient of resonance frequency τ f ≈0 ppm/ o C as well as a heat conductivity λ = 1.46W(mK) −1 can be achieved for the glass/ceramic composite containing 10 wt% Al 2 O 3 sintered at 640 °C. Moreover, the composite can be co-fired compatible with Ag and Al electrodes.The as-prepared glass/Al 2 O 3 ceramic composites are promising candidate for ULTCC 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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Juan Liu,Bing Liu,Cheng Chao Hu,Qing Wei Zhou,Kai Xin Song
(1– x )BaV 2 O 6 - x LiF ( x = 0.025, 0.05, 0.10, 0.15) ceramics with an ultra-low sintering temperature of 475 °C were synthesized using the standard solid-state reaction method. The ceramics demonstrated a remarkable enhancement in the quality factor ( Qf ), reaching a maximum value of 16,800 GHz at x = 0.10, which is 5.6 times higher than that of pure BaV 2 O 6 ceramics obtained in this work. A near-zero temperature coefficient of resonant frequency ( τ f = 1.44 ppm/°C) was simultaneously achieved, together with a dielectric constant ε r of 11.54. Additionally, the chemical compatibility between the present ceramics and the Al electrode was confirmed. Moreover, a millimeter-wave antenna with an excellent S 11 value of −50.3 dB, and a large bandwidth of 3.44 GHz was fabricated using the 0.9BaV 2 O 6 -0.1LiF ceramic as the dielectric resonator . These results highlight the potential application prospects of (1– x )BaV 2 O 6 - x LiF ceramics in the ultra-low temperature co-fired ceramic technology and 5 G millimeter-wave 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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 9
·665
·
IF 3.2
Su Xiuyuan,Chen Yuan-Bin,Chen Junyu,Ma Shijie,Lin Haiqiang
In this study, Sr 2+ was employed to substitute Ca 2+ in KCaPr(MoO 3 ) 4 ceramics. Such ion substitution was found to effectively enhance the Q × f value of KCaPr(MoO 3 ) 4 and moderately decrease its sintering temperature. Scanning electron microscopy (SEM) observations and density measurements indicated satisfactory sintering characteristics of this series of ceramics. Meanwhile, X-ray diffraction (XRD) and Raman spectroscopy analyses suggested the formation of a solid solution without obvious secondary phases or impurities, verifying the successful preparation of single-phase molybdate ceramics. On the basis of P–V–L theoretical analysis, it was suggested that K/Ca/Pr–O bonds mainly contribute to the bond ionicity (fᵢ), whereas Mo–O bonds exert considerable influences on the lattice energy (U), bond energy (E), and thermal expansion coefficient (α). Among the as-prepared ceramic samples, KCa 0.98 Sr 0.02 Pr(MoO 3 ) 4 exhibited the most favorable dielectric properties at 700 ℃ with a relative permittivity (εᵣ) of 10.744, a quality factor-frequency product (Q × f ) of 89 349 GHz, and a temperature coefficient of resonant frequency (τ f ) of − 59.947 ppm/ C. Benefiting from the ion substitution strategy, the obtained materials possessed relatively low sintering temperatures and high Q × f values, suggesting promising potential for application in ultra-low-temperature co-fired ceramics (ULTCC).
✓ 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）