JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 3
·235
·
IF 2.8
Chi Mengjiao,Liu Yahan,Zhou Tao,Mao Minmin,Liu Bing,Wang Ge,Song Kaixin
A cold sintering process (150 °C, 90 min, and 800 MPa) is employed to pre-densify (Mg 1 − x Ni x ) 3 B 2 O 6 (0.00 ≤ x < 0.10, MNBO) ceramics to 80% relative density, followed by a post-annealing treatment between 800 and 950 °C. The origin of optimizations of the sintering, microstructure, and dielectric properties of Ni 2+ -substituted Mg 3 B 2 O 6 ceramic are investigated in detail. All the samples are the single phase of magnesium borate, as confirmed by XRD and Raman spectra. The crystallographic lattice parameters of all compositions are obtained by full-pattern Rietveld refinement. It is found that the ε r of MNBO ceramics is related to the relative density and the ionic polarization of chemical bonds. The change of atomic filling fraction and half peak width is found to be an important effect on the Q × f value. The optimum microwave dielectric properties ( ε r = 6.92, Q × f = 24,336 GHz, τ f = − 53.43 ppm/°C) and the relative density of MNBO ceramics (92.4%) are obtained for composition with 4% Ni 2+ .
研究领域:
材料科学
·
陶瓷与复合材料
·
电子材料
·
微波技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Hengji He,Dainan Zhang,Youbin Zheng,Shuyang Ma,Cheng Liu,Qinghui Yang,Huaiwu Zhang
This study modified CaWO 4 ceramics through co-doping with Li + and Mo 6+ , and prepared Li x Ca 1-x W 1-x Mo x O 4 (x = 0–0.10) using the solid-state reaction method. The results show that at x = 0.02 and sintered at 850 °C, the material exhibits optimal comprehensive performance: ε r ≈ 9.95, Q × f = 79,683 GHz, and τ f improved from −53 to +5.08 ppm/°C, achieving low-temperature sintering and effective temperature stability control. Mechanism analysis indicates that the enhancement of Mo–O bonds and charge transfer behavior contribute to reducing dielectric loss and improving temperature stability. The material also demonstrates good dielectric performance in the terahertz frequency band. A patch antenna designed based on this material achieves a radiation efficiency of 91.47% at 11.65 GHz, highlighting its potential for application in high-frequency LTCC devices.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Jiatong Liu,Qingfeng Li,Yang Yang,Weishuang Fang,Huaicheng Xiang,Ning Zhang,Ning Guan,Jian Li,Ying Tang,Liang Fang
Two novel microwave dielectric ceramics, AgLnMo 2 O 8 (Ln = Sm, Yb), with low permittivity and sintering temperatures, were successfully obtained through the traditional solid-phase synthesis method. XRD analysis coupled with Rietveld refinement confirmed that the as-obtained sample possesses a single-phase tetragonal scheelite-type crystal structure with space group I 4 1 / a . The superior microwave dielectric responses were secured at 825 °C for AgSmMo 2 O 8 ( ε r = 11.74, Q × f = 89,000 GHz, τ f = −47.44 ppm/°C) and 800 °C for AgYbMo 2 O 8 ( ε r = 13.29, Q × f = 73,000 GHz, τ f = −36.54 ppm/°C). Bond valence and Raman analyses demonstrate that Ag + is locally compressed whereas Ln 3+ is underbonded (rattling) at shared dodecahedral sites. The compressed Ag + contributes to the negative τ f values, whereas the smaller Yb 3+ exhibits a more intense rattling effect than Sm 3+ , causing a higher permittivity, elevated loss, and a positive τ f shift. Both ceramics exhibited excellent chemical compatibility with silver-based electrodes, with no new phases observed during co-firing. A cylindrical dielectric resonator antenna was simulated with a resonance frequency of 4.067 GHz and a bandwidth of 289 MHz, using the AgSmMo 2 O 8 ceramic material. The outstanding performance suggests that AgLnMo 2 O 8 (Ln = Sm, Yb) ceramics may be promising candidates for LTCC technologies and C-band antennas.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Pengchao Shao,Xinyuan Lyu,Qihui Sun,Zhaoding Lang,Jia Wang,Ruihang Li,Le Xin,Xianfu Luo,Panpan Lyu,Luchao Ren,Mingwei Zhang
Novel dual-phase high-entropy (Ba 0.2 Sr 0.2 Ca 0.2 Na 0.2 Bi 0.2 )WO 4 ceramics were designed to reduce the sintering temperature and optimize the frequency temperature coefficients of scheelite-type AWO 4 ceramics. XRD and Rietveld refinement analyses revealed that the ceramic contained dual phases of BaWO 4 and Na 0.5 Bi 0.5 WO 4 . The phases had a tetragonal structure with the I4 1 /a space group, as verified by TEM. With increasing sintering temperature, the ɛ r exhibited a decreasing trend owing to the combined influence of ionic polarizability and density. In addition, the variation trend of the Q × f value was similar to that of the density, and its intrinsic influence was investigated by analyzing the FWHM of the Raman vibrational peak. The τ f was well optimized and exhibited a variation trend similar to those of the lattice distortion and microstrain. Finally, the (Ba 0.2 Sr 0.2 Ca 0.2 Na 0.2 Bi 0.2 )WO 4 sintered at 950 °C had the outstanding properties: ɛ r of 13.8, Q×f of 33,110 GHz and τ f of −34 ppm/°C at 9 GHz.
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
·
2018
·
IF 3.779
Yan Yang,Xiqing Xu,Jianxiong Zhao,Bin Wang,Cui Li,Xia Chen,Fang Xu
Saturation magnetization (4π M s ) and ferromagnetic resonance linewidth ( ΔH ) are vital parameters for microwave devices application. The material with high 4π M s and low ΔH is available in microwave frequency. In this work, to synthesize a ferrite material applied to X band, high saturation magnetization LiZnBi ferrite ceramics were selected as matrix. Further, in order to reduce magnetic loss of the LiZnBi ferrites sintered at low temperatures, various nano-TiO 2 were added. Interestingly, the nano-TiO 2 can promote grains growth and suitably enhance saturation magnetization and lower coercivity at low sintering temperature . Meanwhile, the ferromagnetic resonance linewidth ( ΔH ) of the ferrites can also be reduced by introducing more nano-TiO 2 particles. At last, a nano-TiO 2 substituted LiZnBi ferrite ceramics (x = 0.25) with high saturation magnetization (4π M s = ∼3367 G), low coercivity ( H c = ∼146.2 A/m) and low ferromagnetic resonance linewidth ( ΔH = ∼192 Oe) were obtained at 880 °C. The ferrite material is serviceable for X band microwave devices, such as phase shifter and circulator.
研究领域:
材料科学
·
电气工程
·
微波技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Yang,Jie Li,Huaiwu Zhang,Jun Li,Fang Xu,Gang Wang,Feng Gao,Haokai Su
Nowadays, developing nickle zinc ferrites with excellent magnetic and gyromagnetic properties are of great importance for solving the matching problem of 5G communication system. However, much is discussed about soft magnetic properties , but little is reported gyromagnetic properties that is critical for microwave device applications. Herein, Nb 5+ ions substituted Ni 0.29 Cu 0.18 Zn 0.53 Nb x Fe 2-x O 4 (x = 0.00-0.05), possessing high saturation magnetization, approriate initial permeability, high cut-off frequency and low ferromagnetic resonance linewidth (@9.55 GHz), were synthesized by low-temperature firing (900 °C). The phase structure and morphology evolutions were studied in detail. The results of morphology observations revealed that Nb 5+ substitution has significant role in determining produce compact and uniform microstructures of NiCuZn ferrites via suppress the grain growth, which further corresponding enhance the magnetic and gyromagnetic properties. As a result, a uniform and compact grain size can be obtained, corresponding to the change of magnetic and gyromagenetic properties have different trends. Enhanced magnetic and gyromagnetic performance including high initial permeability (μ' = 203 @1 MHz), saturation magnetization (4π M s = 3966 Gauss) and low ferromagnetic resonance linewidth (Δ H = 203 Oe) of the NiCuZn ferrites is achieved though adjusting Nb 5+ ions substitution. More importantly, this work not only for low temperature co-fired ceramic (LTCC) technology but also for high frequency and microwave frequency devices including phase shifter and radars.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-11
·
IF 2.8
Feng Jingmin,Zhang Yajuan,Lu Yang,Shan Yiting,Guo Xiang,Zhou Hongqing
In this study, CaO–B 2 O 3 –SiO 2 (CBS) glass–ceramics were prepared and compounded with different contents of ZrSiO 4 . The sintering behavior, phase composition, microstructure, dielectric properties, thermal properties, and mechanical properties of this CBS glass–ceramic composite ZrSiO 4 ceramic system were investigated. The results show that CBS glass–ceramic can be sintered densely at 750 °C. However, the crystallinity is unexpectedly low and the dielectric properties are greatly damaged. Surprisingly, the addition of ZrSiO 4 improved the dielectric constant of the composites and achieved a dielectric adjustable in the range of 6.0–7.8. When the composite was sintered at 830 °C for 15 min with 35% ZrSiO 4 addition, the bulk density of the composite increased to 2.93 g/cm 3 . The dielectric constant measured at a high frequency of 13 GHz was 6.93 and the dielectric loss of 1.66 × 10 –3 . Accordingly, the addition of ZrSiO 4 reduced the thermal expansion coefficient of the composite to 6.1 ppm/°C and increased the flexural strength of the composite to 248 MPa.
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 NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Wenzhuo Xue,Zilong Xiong,Yupeng Chen,Feihu Tan,Hongyu Yu
High frequency performance and the content of glass are the direct factors affecting the performance of LTCC . In order to reduce the content of glass and improve the performance, we conducted a systematic study on the composition regulation of B 2 O 3 -La 2 O 3 -ZnO (BLZ) glass. Glass with low softening point is helpful for LTCC to achieve compact structure. DSC shows that the softening point of BLZ glass can be reduced from 580 ℃ to 537 ℃ by adjusting the composition. XRD analysis indicate that the glass and Al 2 O 3 formed ZnAl 2 O 4 interfacial phases. Combined with the thermal shrinkage curve, it can be proved that the softening of glass and the formation of interfacial phases are the reasons for the shrinkage and densification of LTCC. The lowest coefficient of thermal expansion of 2.878 ppm/℃ was obtained, and the minimum loss of LTCC is 0.00277 at 15 Ghz. These properties are making LTCC more suitable for high-frequency 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
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 49
·期 1
·773-779
·
IF 1.676
Zheng Jinjie,Xu Huizhong,Yang Yaokang,Liu Lintao,Wu Haitao
Low-firing 1–4 wt.% LiF-doped Li 2 Mg 3 Ti 0.95 (Mg 1/3 Ta 2/3 ) 0.05 O 6 (LMTT) ceramics were synthesized via solid state reaction method. The effects of LiF on the phase composition, sintering behavior as well as microwave dielectric properties were systematically discussed. Adding LiF additives could lower the sintering temperature to 950°C for LMTT ceramics. X-ray powder diffraction analysis indicated that all the compounds prepared in this work have cubic symmetry with space group Fm - 3m . Typically, LMTT with 2 wt.% LiF exhibited a dense uniform microstructure and optimized microwave dielectric properties of ε r ∼ 15.1 (± 0.2), Q · f ∼ 60,100 GHz (at 8.3 GHz), and τ f ∼ − 20.45 ppm/°C at 950°C. In addition, the good chemical compatibility with Ag electrode made LMTT-2 wt.% LiF ceramic an appropriate candidate for low temperature co-fired ceramic.
研究领域:
材料科学
·
电子材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yuxuan Ren,Junxian Wang,Yunfeng Guo,Di Li,Jiamao Li
The influences of Mo 6+ substitution at the B-site of scheelite structure on the sintering character, microstructures, lattice vibrational characteristics, and dielectric properties of BaW 1- x Mo x O 4 ( x = 0.10–0.30) ceramics were studied in detail in this paper. The sintering temperature of BaW 1- x Mo x O 4 ceramics was effectively reduced to less than 950 °C through forming a scheelite solid solution. The densification and the quality factor ( Q × f ) of BaW 1- x Mo x O 4 ceramics were also enhanced compared with pure BaWO 4 ceramic. Raman spectroscopy confirmed that the dielectric constant (ε r ) was highly correlated with molecular polarizability, and the Q × f was strongly dependent on the symmetric stretching bond of [WO 4 ] tetrahedron. Oxygen bond valence was one of crucial parameters for modulating the temperature coefficient of resonant frequency (τ f ). Interestingly, the BaW 0.75 Mo 0.25 O 4 ceramic sintered at 910 °C exhibited favorable microwave dielectric properties of ε r = 9.44, Q × f = 46,820 GHz (@12.5 GHz), and τ f = −69.2 ppm/°C. Meanwhile, the BaW 0.75 Mo 0.25 O 4 ceramic had stupendous dielectric properties in low-frequency band: ε r = 17.5 and dielectric loss (tan δ ) = 2.2×10 −4 (@10 MHz). In addition, there was good chemical compatibility between BaW 0.75 Mo 0.25 O 4 ceramic and silver electrodes. These findings evidence that BaW 1- x Mo x O 4 ceramics are competitive candidates in LTCC technology.
研究领域:
材料科学
·
电子材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hui Yan,Weiwei Wang,Yue Ma,Yong Shang,Lingxiu Shu,Yun Wang,Yue Xu,Bo Wu,Xingang Ren,Xianliang Wu,Gang Wang
Thermally stable x Ba 5 Si 8 O 21 - (1- x ) Ba 2 Si 3 O 8 and x Ba 5 Si 8 O 21 - (1- x ) Ba 2 Si 3 O 8 - z wt% LiF ceramics were successfully synthesized via a conventional solid-state reaction method. In the x Ba 5 Si 8 O 21 - (1- x ) Ba 2 Si 3 O 8 (0.1 ≤ x ≤ 0.8) ceramics, only Ba 5 Si 8 O 21 and Ba 2 Si 3 O 8 phases coexisted, with their phase contents confirmed by the Rietveld refinements. The 0.4Ba 5 Si 8 O 21 -0.6Ba 2 Si 3 O 8 ceramic, composed of 40.98 wt% Ba 5 Si 8 O 21 and 59.02 wt% Ba 2 Si 3 O 8 phases, exhibited near-zero τ f and moderate Q × f values. The phase composition controlled the τ f and Q × f values of x Ba 5 Si 8 O 21 - (1- x ) Ba 2 Si 3 O 8 (0.1 ≤ x ≤ 0.8) ceramics. Moreover, the addition of 3 wt% LiF as a sintering aid reduced the sintering temperature of the 0.4Ba 5 Si 8 O 21 -0.6Ba 2 Si 3 O 8 ceramic to 875 °C, while no other secondary phases were detected in the 0.4Ba 5 Si 8 O 21 -0.6Ba 2 Si 3 O 8 - z wt% LiF ceramics. The 0.4Ba 5 Si 8 O 21 -0.6Ba 2 Si 3 O 8 -3 wt% LiF ceramic demonstrated a dense microstructure and favorable microwave dielectric properties ( ε r = 7.44, Q × f = 8293 GHz and τ f = 2.37 ppm/°C), highlighting its potential for low-temperature co-fired ceramic (LTCC) applications.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinyuan Lyu,Luchao Ren,Le Xin,Xianfu Luo,Hui Peng,Zhichao Dong,Cuncheng Li,Panpan Lyu,Mingwei Zhang
A novel series of (1- x )MgGa 2 O 4 - x BaCu(B 2 O 5 ) ( x = 0.1–0.5) microwave dielectric ceramics were prepared by solid phase method. By adding BaCu(B 2 O 5 ) additives, the sintering temperature of MgGa 2 O 4 ceramics was reduced from 1410 °C to 925 °C. Through an analysis of the trend in packing fraction and FWHM value of T 2g Raman peak, the underlying influence mechanism of various intrinsic factors on the dielectric loss of ceramic were revealed. And the density, as the external factors, exhibits a positive correlation with the dielectric constant and Q × f value. In addition, the high bond strength of Ga-site reduces lattice distortion and consequently enhances the frequency temperature coefficient. The microwave dielectric properties of (1- x )MgGa 2 O 4 - x BaCu(B 2 O 5 ) ( x = 0.3) are found to be superior at a sintering temperature of 925 °C (ε r = 9.42, Q × f = 35,480 GHz, τ f = −22.7 ppm/°C, at 14 GHz). Moreover, the chemical compatibility of ceramics cofiring with Ag electrode makes them a highly promising substrate for microwave communications.
研究领域:
材料科学
·
物理学
✓ 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）