JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 16.8
Jing Ye Jin,Mo Wei,Yu Hui Huang,Qing Wei Zhou,Kai Xin Song,Bing Liu
Achieving a near-zero temperature coefficient of resonant frequency ( τ f ) while maintaining high quality factor ( Q ), typically reported as Q × f ( Qf ), in microwave dielectric ceramics is a significant challenge. In this work, a core-shell structural engineering strategy is proposed for efficient τ f regulation in MgF 2 –0.5 wt% LiF (MFL0.5) ceramics, which exhibit excellent microwave dielectric performance ( ε r = 5.09, Qf = 100,733 GHz) but suffer from a large negative τ f (−67.4 ppm/°C). Instead of dispersing temperature-compensation phases throughout the matrix, a pre-densified TiO 2 ceramic with positive τ f is introduced as a compact core embedded within the MFL0.5 shell, forming an integrated core-shell architecture. Experimental results show that a near-zero τ f of −1.97 ppm/°C can be achieved with only ∼1.27 wt% TiO 2 , while retaining a high Qf value of 50,302 GHz. In contrast, conventional MFL0.5–TiO 2 composite ceramics require 20 wt% TiO 2 to achieve similar τ f compensation, resulting in a significant decrease in Qf to 25,933 GHz. Electric-field distribution simulations highlight the enhanced electric filling factor of the TiO 2 core, which plays a key role in efficient τ f regulation. This core-shell architecture provides a highly effective strategy for regulating τ f with minimal dielectric loss penalty, offering a promising pathway for the development of high-performance, low- ε r microwave dielectric ceramics for advanced communication systems.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xindan Li,Ming Yin,Xincheng Cai,Zhuoying Jia,Hongjiang He,Mingjing Tang,Xiaoqiang Li,Shengquan Yu
Polycrystalline MgF 2 is an attractive mid-infrared laser host material, yet its widespread application in high-power systems is limited by its inferior thermal conductivity compared to single-crystal materials, resulting in inefficient heat dissipation. To address this challenge, we successfully designed and synthesized Fe 2+ : MgF 2 transparent ceramics using a strategic wet chemical coprecipitation method combined with hot-press sintering. This method enables precise Fe 2+ doping within the MgF 2 lattice (Fe x Mg 1-x F 2 , 0.0002≤x ≤ 0.05), with doping effects clearly confirmed by XRD, XPS, and TEM analyses. The resulting ceramics exhibit outstanding mid-infrared transmission properties, with 1-mm-thick samples achieving 90% linear transmittance at 5.7 μm wavelength. More importantly, Fe 2+ incorporation significantly enhances thermal conductivity—peaking at 20.3 W/(m·K), a substantial increase over the baseline value of 11.6 W/(m·K)—while simultaneously raising Vickers hardness to 5.49 ± 0.54 GPa, fulfilling the core design objective. This simultaneous achievement of high optical quality and exceptional thermal management demonstrates that Fe 2+ : MgF 2 transparent ceramics represent a highly promising and reliable candidate material for high-power mid-infrared laser applications.
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高影响因子
Advanced Materials Technologies
·
2024
·Vol. 9
·期 7
·2301855
·
IF 6.4
Chongyang Cai,Leipeng Li,Huimin Li,Pei Li,Tao Li,Dengfeng Peng,Yanmin Yang
Mechanoluminescent materials have gained considerable attention over the past two decades because of their ability to convert wasted mechanical actions, such as friction and compression, into useful light energy. Despite great advances in this field, host matrices that are considered for immobilizing luminescent centers to realize mechanoluminescence are limited mainly to sulfides, oxysalts, and oxysulfides to some extent. To address this shortcoming, a new series of mechanoluminescent materials, i.e., lanthanide-doped MgF 2 (Lanthanide = Yb 3+,2+ , Tm 3+ , Dy 3+ , Tb 3+ , Eu 3+,2+ , Sm 3+ , Ho 3+ , and Er 3+ ) are presented. Upon stimulation with external mechanical stress, all the materials exhibit mechanoluminescence, covering the spectral range of 385 to 1000 nm. Based on this and transparent Ln-doped MgF 2 @Elastomer, the potential value of these mechanoluminescent materials in dynamic pressure visualization is expanded for certain new applications, such as bungee jumping and trampolining. These findings are expected to provide valuable information to the materials community.
研究领域:
材料科学
·
发光材料
·
柔性电子学
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传感器
·
纳米复合材料
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高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Ying Jiang,Xu Chu,Jie Li,Feilong Dong,Qianmai Qiao,Luze Cai,Jun Liu,Haiming Xie
Li metal anode suffers from poor interfacial stability and safety hazards in liquid electrolytes. Designing stable interface on Li metal and replacing liquid electrolytes are critical ways to develop high-energy-density lithium metal batteries (LMBs). In this paper, a superior MgF 2 -containing interface was first studied, and an interface-derived high-performance solid polymer electrolyte (SPE) was prepared by a facile solution casting method. A LiF-rich interface containing Mg atoms is in-situ generated by the reaction between MgF 2 and metallic Li, which simultaneously enhances the interfacial stability and endows dendrite-free Li deposition, enabling the Li metal anodes to realize long-term stable cycling even at 5C (3.04 mA cm −2 ) in commercial carbonate electrolytes. The interface-derived SPE has high room-temperature (RT) ionic conductivity, Li-ion transference number, excellent interfacial compatibility and stability due to the existence of MgF 2 . Under the joint action of stable interface and high-performance SPE, the all-solid-state LMBs can exhibit ultra-stable cycling with high coulombic efficiencies under RT. This work provides a guideline for the development of superior interfaces and high-performance SPEs by learning from each other.
研究领域:
材料科学
·
能源存储与转换
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiu-Xiu Fang,Wen-Min Liao,Jian-Dong Song,Wen-Zhi Jia,Yun Wang,Ji-Qing Lu,Meng-Fei Luo
A series of 3V-xFe/MgF 2 catalysts with different V/Fe molar ratios were prepared by a sol-gel method, and the effect of Fe promotion on the catalytic performance of gas-phase dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) was investigated. It was found that proper V/Fe ratio was helpful to improve the activity. The 3V-0.5Fe/MgF 2 catalyst (with a V/Fe ratio of 6/1) gave a HFC-245fa conversion of 76.6% at 320 °C, which was 13.4% higher than that on the 3V/MgF 2 (63.2%). The synergy between V and Fe species resulted in enhanced surface acidity which accounts for the enhanced activity. The VO x and FeO x species in the fresh catalyst could be transformed to VOF x and FeF 3 species during the reaction, which were regarded as the active sites. However, higher content of Fe in the catalyst resulted in the partial coverage of V species, which led to decline of surface acidity and thus the suppressed activity. Also, surface carbon deposition was responsible for the slight catalyst deactivation .
研究领域:
催化化学
·
材料科学
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Qiongqiong Luo,Jinshun Lei,Ziyu Zhuang,Dewen Zeng
The solubility data of the MgF2–MnF2–MnSO4–H2O quaternary system and its subsystems are crucial for the removal of magnesium ions from a MnSO4 aqueous solution as the MgF2 precipitate. However, these data recorded at 298.15 K have not been reported, except for the MnF2–MnSO4–H2O system. In this study, the solubility isotherms of the MgF2–MnF2–H2O, MgF2–MnSO4–H2O, and MgF2–MnF2–MnSO4–H2O systems at 298.15 K and MnF2 solubility in pure water at various temperatures were systematically measured. The results show that MgF2 solubility initially decreases sharply followed by a gradual decrease as the MnF2 concentration increases. MgF2 solubility rises with increasing MnSO4 concentration in pure MnSO4 and the MnF2-saturated MnSO4 aqueous solution. MgF2 solubility in the MnF2-saturated MnSO4 aqueous solution decreases to 2.3–6.5% of its value in the pure MnSO4 aqueous solution at a certain MnSO4 concentration. MnF2 solubility increases with increasing temperatures in the MnF2–H2O system. A Pitzer–Simonson–Clegg model incorporated in the ISLEC software was used to simulate and predict the solubility curves of the MgF2–MnF2–MnSO4–H2O quaternary system and its subsystems. The model satisfactorily represented the solubility data of the subbinary and subternary systems of the MgF2–MnF2–MnSO4–H2O quaternary system within the analysis error, except for the solubility isotherms of the Mg(Mn)SO4·7H2O, Mg(Mn)SO4·4H2O, and Mg(Mn)SO4·H2O solid solutions. The predicted solubility data of the MgF2–MnSO4–H2O system at 298.15 K agree well with the experimental data with a slight deviation of the MgF2–MnF2–MnSO4–H2O system. Based on the established model, the variation of MgF2 solubility curves with the addition of anhydrous MnF2 in MnSO4 aqueous solutions at different concentrations was predicted. The study provides theoretical guidance for removing magnesium ions from a MnSO4 aqueous solution via MgF2 precipitation.
研究领域:
化学工程
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物理化学
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高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 34
·期 24
·2201801
·
IF 32.086
Shang-Qi Li,Ling Zhang,Ting-Ting Liu,Yao-Wen Zhang,Chaofei Guo,Yong Wang,Fei-Hu Du
Uncontrolled lithium dendrite growth and dramatic volume change during cycling have long been severely impeding the practical applications of Li metal as the ultimate anode. In this work, ultrathin MgF 2 nanosheets encapsulated inside nitrogen-doped graphene-like hollow nanospheres (MgF 2 NSs@NGHSs) are ingeniously fabricated to address these problems by a perfect combination of atomic layer deposition and chemical vapor deposition. The uniform and continuous Li–Mg solid-solution inner layer formed by the MgF 2 nanosheets can reduce the nucleation overpotential and induce selective deposition of Li into the cavities of the NGHSs. Furthermore, the Li deposition behavior and mechanism of the hybrid host are comprehensively explored by in situ optical microscopy at the macroscopic level, in situ transmission electron microscopy at the microscopic level, and theoretical calculations at the atomic level, respectively. Benefiting from a synergistic modulation strategy of nanosheet seed-induced nucleation and Li-confined growth, the designed composite demonstrates an endurance of 590 cycles for asymmetric cells and a lifespan over 1330 h for corresponding symmetric cells. When applied in LiFePO 4 full cells, it provides a reversible capacity of 90.6 mAh g −1 after 1000 cycles at 1 C.
研究领域:
材料科学
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储能
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电化学
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纳米技术
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电池技术
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高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2025
·
IF 3.5
Y.T. Liu,Y. Ji,W.J. Zhu,Q. Qian,Q.Y. Zhang
0.9 μm fiber lasers enable efficient generation of blue laser via second-harmonic conversion, which are essential light sources for applications such as undersea communications, laser displays, and biophotonic imaging. Glass fibers doped with Nd 3+ ions serve as the gain medium for these lasers; however, the competition from the four-energy-level transition 4 F 3/2 → 4 I 11/2 remains a significant challenge. Fluorophosphate (FP) glass combines the high rare-earth solubility of phosphate glasses with the low phonon energy of fluoride, particularly benefiting from large crystal field strength that enhances the 4 F 3/2 → 4 I 9/2 transition. Nonetheless, crystallization and phase separation in FP glass pose substantial challenges for this multi-component glass system. Herein, a novel Nd 3+ -doped Sr(PO 3 ) 2 −Ba(PO 3 ) 2 −AlF 3 −MgF 2 glass is reported. A thermodynamic approach was employed to predict the glass-forming region of the Sr(PO 3 ) 2 −AlF 3 −MgF 2 system, providing a robust design framework for FP compositions with superior glass-forming ability. Further investigations into the gradual substitution of Ba(PO 3 ) 2 to Sr(PO 3 ) 2 elucidate the structure-property relationship between the local network environment and Nd 3+ emission at 0.9 µm. The optimized FP glass demonstrates remarkable stability against crystallization (Δ T >100 °C), a high branching ratio (47.2 %), a large emission cross-section (2.36 × 10 −20 cm 2 ), an extended lifetime (334 μs), a high spectral quality factor (7.88 × 10 −24 cm 2 ·s), and a broad gain bandwidth (10.71 × 10 −26 cm 3 ) at 0.9 μm, surpassing previously reported glass hosts and establishing it as a highly promising host material for 0.9 μm fiber laser applications.
研究领域:
光子学
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材料科学
·
光学材料
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激光技术
·
玻璃科学
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高影响因子
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