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
·
物理化学
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 92
·期 1
·200-207
·
IF 1.986
Tang Haodong,Zou Chaoyu,Hu Tao,Zhou Nan,Li Yuzhen,Li Lichun,Han Wenfeng,Li Ying
High surface area Cr 3+ -doped MgF 2 catalysts were synthesized from an aqueous sol–gel method under mild conditions. The amount of Cr 3+ doped in the investigated CrF 3 /MgF 2 catalysts covered a wide range of mole concentration ranging from 0 to 25 mol% to reveal its effect on the properties of the catalysts. The physio-chemical properties of the CrF 3 /MgF 2 catalyst were examined by means of N 2 gas sorption, X-ray powder diffraction (XRD), energy dispersive spectrometer (EDS), and temperature-programmed desorption (TPD) of NH 3 . XRD analysis indicates that the doping of Cr 3+ resulted in reduced crystallinity but did not change the original crystalline structure of MgF 2 . Doping of Cr 3+ (8–25 mol%), on the other hand, can increase the surface area of CrF 3 /MgF 2 significantly to ~300 m 2 /g from ~50 m 2 /g of the nondoped MgF 2 . There is also significant amount of Lewis acid sites formed upon incorporation of Cr 3+ into MgF 2 lattice, which was evidenced from the NH 3 -TPD results. The catalytic activity of the 25 mol% Cr 3+ -doped MgF 2 catalyst on the dehydrofluorination reaction of 1,1-difluoroethane (HFC-152a, CH 3 CHF 2 ) has reached a conversion rate of ~57%, which is over two times higher than the undoped MgF 2 catalyst. Furthermore, the 25 mol% Cr 3+ -doped MgF 2 catalyst has been successfully tested over 210 h upon the dehydrofluorination of CH 3 CHF 2 at 300 °C with the conversion rate remain greater than ~45%.
研究领域:
材料科学
·
催化化学
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高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Xindan Li,Ming Yin,Chao Xiao,Zhong Kuang,Shengquan Yu,Xiaoqiang Li,Zhuoying Jia
The co-precipitation approach was successfully used in this investigation to produce MgF 2 nanoparticles. The effects of various heat treatments on the particle size and morphology of MgF 2 nanoparticles were systematically investigated. Based on the experimental results, the powder calcined at 500 °C, having crystallites size that are typically between 80 and 120 nm in size, was identified as the optimal sample. This calcined powder was subsequently used to produce polycrystalline MgF 2 ceramics through hot pressing (HP). It was also investigated how the characteristics of MgF 2 ceramics were affected by low-pressure hot pressing. The results demonstrated that the optimal transmittance of 95.8 % was achieved at a pressure of 30 MPa and a hot-pressing temperature of 800 °C. Furthermore, the dielectric constant (ε r ), Q × f value, Vickers hardness ( H V ), and fracture toughness ( K IC ) of the samples produced at 30 MPa and 800 °C were evaluated. The dielectric constant and Q × f value of MgF 2 ceramics, measured at 13.6231 GHz, were found to be 5.2996 and 114534 GHz, respectively. The Vickers hardness was measured at 5.21 ± 0.42 GPa, and the fracture toughness was determined to be 0.842 ± 0.067 MPa m 1/2 .
研究领域:
材料科学
·
光学材料
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高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Jintai Lin,Shuting Pang,Qianming Wang
We used ultrasonic-assisted microwave technique to synthesize V 2 O 5 /MgF 2 :Eu 3+ with characteristic red emissions. Phototocatalytic performances and emission properties were improved compared to the traditional route. Further investigation indicates that 9% V 2 O 5 (molar ratio V/Mg=9%) gave the best result for decomposing methylene blue (91% in 1 h).
研究领域:
材料科学
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化学工程
·
环境科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 35
·期 8
·2415542
·
IF 18.5
Meiqi Jia,Ting-Ting Wu,Si-Dong Zhang,Sijie Guo,Yongzhu Fu,An-Min Cao
Garnet-type solid-state electrolytes (SSEs) exemplified by Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 (LLZT) are chemically unstable when exposed to air, leading to the formation of impurities and poor wettability with Li metal. Herein, a protocol to address this Li/LLZT interface challenge is demonstrated by constructing a lithiophilic MgF 2 nanofilm on the LLZT pellet. Specifically, a solution-based process is developed for the surface engineering of LLZT, utilizing magnesium trifluoroacetate (MTF) as the molecular precursor while poly(acrylic acid) (PAA) as the coordinating agent in a sol-gel process. It is demonstrated that a facile spin-coating treatment followed by high-temperature annealing reliably forms crack-free MgF 2 nanofilms with precise thickness control. Introduction an MgF 2 interlayer transforms the LLZT pellet into a highly lithophilic, facilitating close contact with the lithium anode, thereby leading to a significantly reduced interfacial resistance from 1190 Ω cm 2 to 6 Ω cm 2 . Such an interfacial engineering enables stable cycling of full batteries with high reversibility and rate capability using commercial LiFePO 4 and LiNi 0.83 Co 0.07 Mn 0.1 O 2 as cathodes. This study unfolds the possibility of a solution-based method as a facile and scalable process for the construction of fluoride nanofilms, which is promising to address the critical interfacial challenges of solid-state batteries (SSBs) to facilitate its practical applications.
研究领域:
材料科学
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储能
·
电化学
·
固体离子学
·
纳米薄膜制备
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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
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Jiaming Li,Jiaxin Yang,Zhaowen Wang
Developing environmentally benign and efficient recycling strategies remains a critical challenge confronting the battery recycling field. High-temperature molten salt electrolysis is a promising method for recovering lithium iron phosphate. The electrochemical behaviors of Fe(III) and P(V) ions on a tungsten working electrode in the NaF-AlF 3 -LiFePO 4 /Fe 2 O 3 /Li 3 PO 4 system were investigated using cyclic voltammetry (CV) and square wave voltammetry (SWV), respectively. Results reveal that both Fe(III) and P(V) undergo two-step electron transfer reduction pathways: Fe(III) → Fe(II) → Fe(0) and P(V) → P(III) → P(0). The reduction oxidation process of Fe is a quasi-reversible process controlled by diffusion, while the process of P is an irreversible process. The reduction potential range of Fe and P does not overlap, and Fe will be reduced first. By controlling the potential, different reduction products of iron and phosphorus are obtained separately. At −1.0 V, Fe is preferentially reduced, and the deposited product is iron powder. At −1.8 V, P and Fe were simultaneously reduced, and they were collected in the form of P 4 and Fe 3 P products, respectively. The remaining lithium can be stored in fluoride molten salts to form lithium containing electrolytes, which are important additives in the aluminum electrolysis industry and can be directly used. The recycling of spent lithium iron phosphate batteries through molten salt electrolysis not only achieves harmless treatment of Fe and P elements, but also provides a new solution for the scarce Li resources in other industries.
研究领域:
电化学
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电池回收
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材料回收
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熔盐化学
·
可持续能源技术
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.5
Haozhen Liu,Shiyu Du,Paipai Zhang,Jiawei Zhao,Yanna Chen,Donghai An
A high-performance ultraviolet (UV) nonlinear optical (NLO) material requires three essential characteristics: a short UV absorption edge, a strong secondharmonic generation (SHG) response, and favorable NLO coefficients. In this study, a novel rare-earth borate compound with the formula K 7 MgY 2 (B 5 O 10 ) 3 was successfully synthesized using a high-temperature solution method combined with chemical cosubstitution. The crystal adopts a non-centrosymmetric (NCS) structure (space group R32) and exhibits an SHG intensity 1.3 times that of potassium dihydrogen phosphate (KDP) under 1064 nm laser irradiation. Its UV cutoff edge is determined to be 290 nm, demonstrating exceptional potential for UV optical applications. Combined experimental and theoretical analyses reveal that the synergistic interplay between polarizable [B 5 O 10 ] groups and heterovalent K + /Mg 2+ /Y 3+ substitution underpins its superior NLO performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Kunpeng Shi,Junhao Li,Yan Chen,Cang zhang,Yougui Yang,Ling He,Meng Wu,Tong Feng,Dacheng Zhou,Jianbei Qiu
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are an emerging type of broadband NIR light source, yet simultaneously achieving ultra-broadband emission and high luminous efficiency remains a key challenge. Herein, we developed a series of Cr 3+ , Ni 2+ , F - co-doped magnesium gallate oxyfluoride phosphors. Compared with non-F - -doped counterparts, the resultant phosphors exhibited an 8.17-fold enhancement in photoluminescence intensity, with the internal quantum efficiency (IQE) significantly increasing from 22.6 % to 74.6 %. F⁻ doping reduces the local crystal field symmetry around Cr³⁺ ions, attenuates the parity-forbidden effect of d-d transitions, and passivates oxygen vacancy defects, thus serving as the primary mechanism for luminescence enhancement. Importantly, at 373 K, MGOF:Cr 3+ ,Ni 2+ retained 71.7 % of its room-temperature emission intensity. Ultimately, the high-efficiency, broadband near-infrared emission from MGOF:Cr 3+ , Ni 2+ was successfully employed in night vision, biological tissue detection, non-destructive inspection, and food quality monitoring applications. The proposed synergistic dual strategy of anion substitution and vacancy passivation provides robust design principles for the rational fabrication of advanced high-performance luminescent phosphors.
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高影响因子
CORROSION SCIENCE
·
2026
·
IF 10.3
Yueqi Wu,Mingyong Jia,Qiang Shen,Fei Chen
Silicon nitride (Si 3 N 4 ) ceramics are promising structural materials for next-generation concentrated solar power (CSP) systems, while their long-term stability in aggressive molten chloride salts remains insufficiently understood. Here, we investigate the corrosion behavior and decomposition mechanism of a conventional Y 2 O 3 -sintered β-Si 3 N 4 ceramic in molten MgCl 2 –NaCl–KCl at 600 °C. The corrosion process proceeds through three sequential stages: preferential dissolution of the amorphous intergranular phase (IGP), formation of a detrimental Mg 2 SiO 4 layer, and subsequent chemical attack of β-Si 3 N 4 grains. Guided by this mechanistic understanding, we propose a grain boundary engineering strategy using YF 3 /MgF 2 sintering aids to fabricate corrosion-resistant Si 3 N 4 ceramics. The engineered ceramic exhibited a 25% reduction in average corrosion depth and excellent property retention after 800 h of exposure. Its bending strength loss is only 8.3%, compared with 13.8% for the reference material, and its thermal conductivity loss is 4.8%, compared with 8.4% for the reference material. The improved corrosion resistance is attributed to the combined effects of a chemically stable crystalline Y 4 Si 2 N 2 O 7 intergranular phase, elimination of residual SiO 2 impurities, and a coarsened microstructure. Salt purification experiments further confirmed the proposed corrosion mechanism by suppressing impurity-driven decomposition. In purified molten salt, the engineered ceramic shows an extrapolated corrosion rate of approximately 16.8 μm·year - ¹ , meeting the U.S. DOE corrosion target of < 20.0 μm·year - ¹ . These results demonstrate that grain boundary engineering is an effective strategy for improving the durability of Si 3 N 4 ceramics in high-temperature molten chloride salt environments.
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高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Chongyang Cai,Leipeng Li,Xuan Fan,Jie Wang,Tingting Deng,Feng Wang,Yanmin Yang
Accurate and reliable radiation dosimetry is critical for applications ranging from cancer radiotherapy to nuclear safety and space exploration. While thermoluminescence and optically stimulated luminescence serve as benchmark technologies, their inherently destructive readout mechanisms preclude the straightforward, repeated verification of an absorbed dose and require complex laboratory procedures. Here, we propose a novel mechanoluminescence (ML) ratiometric dosimetry. It depends on KMgF 3 :Sm 2+,3+ that can exhibit both ML at 685 nm (Sm 2+ : 5 D 0 → 7 F 0 ) and 602 nm (Sm 3+ : 4 G 5/2 → 6 H 7/2 ) under external force stimulation. The ML intensity ratio of the 602 nm band to the 685 nm band increases linearly with increasing the radiation dosage of x-rays. This ratiometric approach provides a robust internal self-calibration, making the readout immune to fluctuations in stress magnitude or duration, a fatal flaw in prior ML intensity-based methods. Therefore, we can obtain the x-ray dose simply by pressing the KMgF 3 :Sm 2+,3+ samples. This strategy allows for multiple, nondestructive measurements, enabling on-demand verification of radiation doses with unparalleled simplicity.
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DOI
PubMed
高影响因子
Materials
·
2026
·Vol. 19
·期 9
·1685
·
IF 3.7
Runze Zhou,Xinqiang Yuan,Longfei Zhang,Chi Zhang,Hongxing Dong,Long Zhang
Highlights Data-driven framework for fluoride-glass prediction and inverse design. The genetic-algorithm–optimized backpropagation neural network jointly predicts refractive index and density. Bayesian hyperparameter tuning enhances accuracy and robustness. Constraint-aware inverse design ranks feasible compositions by targets & similarity. SHapley Additive exPlanations analysis is employed to quantify feature importance and enhance the interpretability of the model. With the increasing application of novel glass materials in the field of optics, traditional empirical and trial-and-error approaches to glass development are gradually becoming insufficient to meet escalating performance demands. In this study, we propose a neural network-based machine learning method for the design of advanced fluoride glass materials. Predictive models for density and refractive index were first developed based on online fluoride glass datasets. Moreover, SHapley Additive exPlanations (SHAP) analysis was adopted to uncover the quantitative composition-property relationship. Then, the well-trained model was employed for inverse design, identifying specific compositions that fulfill desired properties in terms of density and refractive index. Finally, several recommended compositions were experimentally validated and the measured density and refractive index matched well with the corresponding input values, thereby confirming the effectiveness of the proposed method in designing new fluoride glass materials.
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PubMed
高影响因子
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