JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 13
·10183-10193
·
IF 2.779
Zhang Liangbin,Mei Hongrong,Rao Zhenggang,Shu Longlong,Li Chunchun
In this work, a strategy was demonstrated to reduce the sintering temperature of Mg 2 SiO 4 ceramics while keeping the macrostructure unchanged, through an appropriate amount of low melting point Ge substitution for B-site Si. A series of Mg 2 Si 1 − x Ge x O 4 ( x = 0.1–0.4) ceramics were prepared by a solid-state reaction method. Influences of Ge substitution on the sintering behavior, crystal structure, and microwave dielectric properties were studied. By comparison, the Ge-substituted samples could be effectively sintered at relatively lower sintering temperatures (~ 1370 °C), which is more than 100 °C lower than the nominal Mg 2 SiO 4 . In addition, the optimum microwave dielectric performance was achieved in the sample with x = 0.4, with the relative density ~ 97%, the relative dielectric constant ( ε r ) of 7.2, the quality factor ( Q × f ) of 75,794 GHz, and the temperature coefficient of the resonance frequency ( τ f ) of − 41.2 ppm/°C. This compositional regulation provides a paradigm for improving the sintering characteristics of silicate.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 64
·33866-33873
·
IF 3.708
Zheng-Yong Chen,Hong-Wen Gao,Jia-Xiang Yang
The PEI@Mg2SiO4 hybrid composite is readily synthesized for adsorbing carbon dioxide (CO2) and nitrophenol compounds (NACs), in which more than 11% PEI is embedded. By the removal rate of 4-nitrophenol (10 mg L−1) and the capture capacity of CO2, the Mg2+ : PEI : SiO32− optimal mole ratio of the PEI@Mg2SiO4 is 1 : 0.6 : 1.5. The composite shows the highest adsorption amounts of 0.94 mmol g−1 CO2 at 50 °C. The heat treatment regeneration exhibits a good stability, e.g. the CO2 capture capacity decreases by only 20% after four cycles, and the desorption rate of CO2 remains more than 91%. It also exhibites a fast adsorption and high capacity for 4-nitrophenol (NP), 2,4-dinitrophenol (DNP) and 2,4,6-trinitrophenyl group (TNP). The adsorption capacity of NP, DNP and TNP is 2.40 mmol g−1, 2.66 mmol g−1 and 4.85 mmol g−1 respectively, which is more than that of the conventional sorbents. This work presents the higher capacity and eco–friendly sorbent for CO2 and nitrophenol compounds.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yuanming Lai,Caiyun Hong,Lichuan Jin,Xiaoli Tang,Huaiwu Zhang,Xin Huang,Jie Li,Hua Su
In this work, a series of low-temperature-firing (1− x )Mg 2 SiO 4 – x Li 2 TiO 3 –8 wt% LiF ( x = 35–85 wt%) microwave dielectric ceramics was prepared through conventional solid state reaction. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses showed that the Li 2 TiO 3 phase was transformed into cubic phase LiTiO 2 phase and secondary phase Li 2 TiSiO 5 . Partial substitution of Mg 2+ ions for Ti 3+ ions or Li + Ti 3+ ions increased the cell volume of the LiTiO 2 phase. The dense microstructures were obtained in low Li 2 TiO 3 content ( x ≤ 65 wt%) samples sintered at 900 °C, whereas the small quantity of pores presented in high Li 2 TiO 3 content ( x ≥ 75 wt%) samples sintered at 900 °C and low Li 2 TiO 3 content ( x = 45 wt%) sintered at 850 and 950 °C. Samples at x = 45 wt% under sintering at 900 °C for 4 h showed excellent microwave dielectric properties of ε r = 10.7, high Q × f = 237,400 GHz and near-zero τ f = − 3.0 ppm/°C. The ceramic also exhibited excellent chemical compatibility with Ag. Thus, the fabricated material could be a possible candidate for low temperature co-fired ceramic (LTCC) applications.
研究领域:
材料科学
·
电子材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Haoxin Lin,Lin Tian,Xiaoyan Liu,Guocheng Wang,Chongchong Xie,Guohua Li,Chao Tian
In order to improve the comprehensive utilization rate of magnesite flotation tailings and solve its accumulation pollution problem. In this work, Mg 2 SiO 4 -MgO refractories were prepared by solid-phase method using magnesite flotation tailings as raw material and Pr 6 O 11 as additive. The adjustment mechanism of Pr 6 O 11 on the intergranular binding phase of Mg 2 SiO 4 -MgO refractories was investigated and the optimal addition amount of Pr 6 O 11 was determined through thermodynamic calculations, DSC test, phase composition test, microstructure observations and physical property tests. The results show that when Pr 6 O 11 is not added, the intergranular binding phase of Mg 2 SiO 4 -MgO refractories is CaO·MgO·SiO 2 . After Pr 6 O 11 is added, Pr 6 O 11 takes advantage of its high reactivity to extract SiO 2 and CaO from the MgO-SiO 2 -CaO system, which is supposed to synthesize CaO·MgO·SiO 2 , and reacts to produce Ca 2 Pr 8 (SiO 4 ) 6 O 2 , which consumes the reactants for synthesizing CaO·MgO·SiO 2 , thus inhibiting the production of CaO·MgO·SiO 2 . Thereby adjust the refractories intergranular binding phase from low melting point CaO·MgO·SiO 2 (melting point:1498°C) to high melting point Ca 2 Pr 8 (SiO 4 ) 6 O 2 (melting point:1780°C), which resulted in the improvement of the refractories's high temperature resistance and thermal shock resistance. At the same time, Pr 6 O 11 can form solid solution with Mg 2 SiO 4 and MgO to promote the sintering densification of the refractories, and the overall performance of the refractories is optimal when the addition amount of Pr 6 O 11 is 2wt%.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2263-2274
·
IF 2.2
Shan Yiting,Yang Chengyu,Lu Yang,Li Junkai,Guo Xiang,Zhou Hongqing
The (1− x )CaO-B 2 O 3 -SiO 2 (CBS)/ x Mg 2 SiO 4 composites were prepared and the influence of CBS crystallizable glass content on the sintering properties, dielectric properties, and thermal properties of the composites were investigated. The primary crystal phases in the CBS/Mg 2 SiO 4 composites were CaMgSi 2 O 6 and CaB 2 O 4 . An appropriate amount of Mg 2 SiO 4 reduced the crystallization temperature of the composite. For x = 0.30, a sintering temperature of 890°C with a holding time of 60 min resulted in a bulk density of 2.645 g/cm 3 , dielectric constant of 6.6, and dielectric loss of 2.54 × 10 −3 at 10 kHz. Prolonged holding time promotes grain growth; when extended from 60 min to 180 min for x = 0.30, the permittivity increased from 6.5 to 6.6 and Q × f increased from 10,100 GHz to 15,700 GHz when x = 0.30 at 13 GHz. The CTE of 70 wt.% CBS + 30 wt.% Mg 2 SiO 4 composite was 9.5 ppm/°C, which approached the value of a circuit board for a ceramic ball grid array package (CBGA).
研究领域:
材料科学
·
电子工程
✓ 已验证
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yu Liu,Minmin Mao,Tao Ni,Huan Liu,Jin Fang,Lei Li,Hadi Barzegar Bafrooei,Feng Shi,Fayaz Hussain,Dawei Wang,Kaixin Song
As 5G communication technology advances into millimeter-wave frequencies, the demand rises for microwave dielectric ceramics with low dielectric constant and low dielectric loss. In this regard, Mg 2 SiO 4 emerges as one of the most promising candidates. Herein, Mg 2-x Ga x Si 1-x Al x O 4 (MGSA, x = 0∼0.03) ceramics were prepared by a solid-state reaction process employing heterovalent ion substitution strategy, achieving ultra-low loss and enhanced temperature stability of resonant frequency while maintaining low dielectric constant. The effects of the partial substitution of Ga 3+ for Mg 2+ and Al 3+ for Si 4+ in MGSA ceramics were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), Raman spectra, infrared reflectivity spectra, and combined with P–V–L bond theory analysis. XRD results revealed a solid solution formation, while SEM images highlighted microstructure variations with increasing x. Based on P–V–L theory, it was found that the dielectric constant is mainly affected by average bond ionicity A f i , while τ f is mainly affected by bond energy E . The intrinsic loss determined Qf value, which is further validated by Raman and infrared spectra. The optimal performance for millimeter-wave applications was achieved at x = 0.01: ε r = 6.95, τ f = −37.7 ppm/ o C, Qf = 244,800 GHz (at 27.15 GHz).
研究领域:
材料科学
·
通信技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 34
·1-15
·
IF 2.8
Zhang Miao,Liu Xiangchun,Zhang Kai,Guan Jiayan,Zhang Hanbi,Chen Danni,Wei Ziyao,Gao Feng
Mg 2 SiO 4 , the most studied low dielectric microwave ceramic system, has a dielectric constant that is too large compared to the demand. Compounding a low dielectric second phase and introducing a porous phase can reduce the dielectric constant. However, both methods often require a change in ceramics production technology routes. This paper attempts to reduce the dielectric constant of Mg 2 SiO 4 using substitutional doping guided by theoretical calculations. Firstly, the substitution of zinc ions for magnesium ions was designed using first-principles calculations. Theoretical calculations show that Zn-O covalent bonding is more predominant after Zn 2+ substitution and contributes most of the covalent bonding in the crystal cell, effectively weakening the ionic polarization in the structure and decreasing the dielectric constant of the ceramics. Secondly, the (Mg 0.4 Zn 0.6 ) 2 SiO 4 ration design was experimentally verified, and the sol-gel-molten salt method was used to reduce the ceramic sintering temperature in the experiments. Compared to the solid-phase methods, the sol-gel-molten salt method reduced ceramic sintering temperature to 1225 °C, while Zn 2+ substitutional doping reduced the dielectric constant by 6.11.
研究领域:
材料科学
·
计算材料学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Binbin Xu,Honglie Shen,Jiawei Ge,Quntao Tang
Silicon suboxide (SiO x ) is considered as one of the potential candidates for next-generation lithium-ion battery (LIB) anode materials. However, the application of this material is limited by volume change during the discharging and charging process and its low initial cycle Coulombic efficiency (ICE). Herein, we report a controllable and cost-effective route to synthesize the SiO x /MgO/Mg 2 SiO 4 /C (SMC) composite using magesiothermic reaction (MTR), hot-water treatment, and carbonization process. Moreover, the composite exhibits a hierarchical buffer structure composed of microspheres . Because of its special dehydration ability to disrupt the hydrolytic cycle, the introduction of MgO is proved to be beneficial to LIBs’ cycling performance and rate capability. Besides, with the formation of Mg 2 SiO 4 , the consumption of SiO 2 improves the ICE of the SMC anode to 87.48%. The hierarchical microstructure makes the resultant SMC anode exhibit a stable reversible capacity of 550 mAh g −1 , which means a high capacity retention ratio of 78.81% after 200 cycles. Furthermore, the specific capacity of SMC anode keeps around 600 mAh g −1 at the current density of 800 mA g −1 , showing superb rate performance. This work provides a novel approach to taking advantage of by-products of MTR and also demonstrates the potential of industrial application of SiO x /C anodes.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shihai Miao,Yanjie Liang,Dongxun Chen,Ruiqi Shi,Xihui Shan,Yi Zhang,Fei Xie,Xiao-Jun Wang
Infrared-emitting phosphor-converted light-emitting diodes (LEDs) are desirable light sources for a very wide range of applications such as spectroscopy analysis, nondestructive monitoring, covert information identification, and night-vision surveillance. The most important aspect of infrared emitters for spectroscopy is to cover the widest possible wavelength range of emitted light. However, developing ultrabroad-band infrared emitters based on converter technology is still a challenging task due to the lack of suitable phosphor materials that emit in a wide wavelength range upon excitation from blue-emitting chips. Herein, this work demonstrates Cr3+-activated Mg2SiO4 infrared phosphors with a super wide infrared spectral range of 600 to 1400 nm and high internal quantum yield up to 80.4% upon 460 nm excitation. Site-selective occupancy of Cr3+ emitters in two different Mg sites in the Mg2SiO4 lattice results in two distinct broad emission bands peaking at 760 and 970 nm, both of which contribute to the ultrabroad-band infrared luminescence with a full width at half maximum (FWHM) of 419 nm. This is by far the broadest infrared emission to the best of our knowledge. On this basis, an ultrabroad-band infrared LED prototype has been fabricated by the combination of the Mg2SiO4:Cr3+ phosphor with a blue LED chip, which shows great potential for imaging and sensing applications. This work demonstrates that site-selective occupancy control of Cr ions is an effective strategy for developing ultrabroad-band Cr3+-doped phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Cancan Bian,Rusheng Fu,Zhepu Shi,Jingjing Ji,Jun Zhang,Wen Chen,Xufeng Zhou,Siqi Shi,Zhaoping Liu
Silicon monoxide (SiO) is considered as one of the most promising anode material candidates for next-generation high-energy-density lithium ion batteries (LIBs) due to its high specific capacity and relatively lower volume expansion than that of Si. However, a large number of irreversible products are formed during the first charging and discharging process, resulting in a low initial Coulombic efficiency (ICE) of SiO. Herein, we report an economical and convenient method to increase the ICE of SiO without sacrificing its specific capacity by a solid reaction between magnesium silicide (Mg2Si) and micron-sized SiO. The reaction product (named MSO) exhibits a unique core–shell structure with uniformly distributed Mg2SiO4 and Si as the shell and disproportionated SiO as the core. MSO exhibits a superior ICE and a high reversible capacity of 81.7% and 1306.1 mAh g–1, respectively, which can be further increased to 88.7% and 1446.4 mAh g–1 after carbon coating, and improved cyclic stability compared to bare SiO. This work provides a simple yet effective strategy to address the low ICE issue of SiO anode materials to promote the practical application of SiO.
研究领域:
材料科学
·
储能
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Maohua Wang,Yuan Rao,Kaitong Liu,Rouziaji Alimu,Shihang Zhou,Aierken Sidike
The development of simple and effective strategies to regulate and optimize the luminescent properties of Ce 3+ in phosphors is both crucial and highly challenging. Herein, we propose a simple C + H 2 co-reduction strategy using graphite crucibles to achieve tunable luminescence of Ce 3+ at the Mg sites in Mg 2 SiO 4 . When the sample is synthesized under H 2 reduction alone, Ce 3+ preferentially occupies the Mg(1) position in Mg 2 SiO 4 and produces blue-violet emission. While the sample is synthesized under C + H 2 co-reduction, Ce 3+ can occupy the Mg(2) position giving rise to a yellow-green emission and producing broad-spectrum luminescence. Particularly, under 365 nm excitation, the Ce 3+ occupying the Mg(2) site can achieve ultra-broadband emission with a full width at half maximum reaching 232 nm. By co-doping Zn 2+ , Mg 2 SiO 4 :Ce 3+ ,Zn 2+ not only exhibits good thermal stability (retaining 48% of its initial intensity at 423 K), but also shows a high color rendering index (Ra = 95.3) when combined with commercial red fluorescent powder (Sr,Ca)AlSiN 3 :Eu 2+ . This work is expected to be effectively applied in lighting and anti-counterfeiting, and it provides a new approach for activating hidden crystallographic sites to achieve multi-functional applications.
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DOI
高影响因子
危险品化学品经营许可证（带存储）