JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Tianping Huang,Jianxin Zou,Ning Zhao,Xiaoqin Zeng,Wenjiang Ding
A new reversible hydrogen storage system, 3NaBH 4 -0.5ScF 3 -0.5YF 3 , was synthesized by using the ball-milling method. It is shown that no reaction occurs during the ball-milling process. The hydrogen desorption process of the ball-milled composite can be divided into three consecutive steps: (i) An initial stage from room temperature to 320 °C with about 0.42 wt% of hydrogen released, that can be ascribed to the substitution of H − by F − in NaBH 4 ; (ii) The second stage starts from 320 °C to 450 °C, releasing about 1.06 wt% of hydrogen; (iii) The final stage ranges from 450 °C to 480 °C, with 2.58 wt% of hydrogen released. The total yield of hydrogen reaches 4.06 wt% at 480 °C. The completely dehydrogenated products of the 3NaBH 4 -0.5ScF 3 -0.5YF 3 composite can absorb 2.15 wt% of hydrogen at 380 °C in 6.5 h, which shows greatly enhanced reversibility when compared with sole ScF 3 addition. It should be noted that one of the destabilizers ScF 3 was also regenerated besides NaBH 4 in the rehydrogenated products. Based on the XRD and FTIR analyses, the synergistic effects of 3d transition metal fluoride ScF 3 and rare earth metal fluoride YF 3 on the hydrogen desorption and absorption performance of NaBH 4 were discussed.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 3
·497-507
·
IF 2.326
Jia Ke,Bi Zun,Liu Yunfei,Lyu Yinong
Studying electronic structure plays a key role in improving the photoluminescence (PL) properties of materials. Therefore, the electronic structure of YF 3 : x Eu 3+ with different Eu 3+ ions doping concentrations was explored by first-principles calculations based on density functional theory (DFT). As calculated, the YF 3 host had an indirect bandgap of 7.68 eV. From all calculation results we got, the band structure of YF 3 : x Eu 3+ exhibited the smallest direct band gap of 6.54 eV when the value of x was 0.10. This small direct band gap is beneficial to obtain excellent emission intensity. Besides, the morphologies and sizes have a significant influence on the fluorescence intensity of the products. A series of YF 3 : x Eu 3+ phosphors with leaf-like, spindle-like, pecan-like, and granular-like morphologies were obtained by changing the RE 3+ /NaF ratio via a microwave hydrothermal method. At the same time, the formation process of granule-like YF 3 : Eu 3+ was explored through time-dependent experiments. Furthermore, the fluorescence performance of YF 3 : x Eu 3+ was studied in detail. The as-obtained YF 3 : x Eu 3+ can exhibit orange-red emission under ultraviolet excitation because of the magnetic dipole of the 5 D 0 – 7 F 1 transition of Eu 3+ ions. After comparing the luminescence properties of samples with different morphologies, we found that the sample with granule-like morphology had the highest orange-red emission intensity. The experimental result proved that the appropriate Eu 3+ ions doping concentration were x = 0.10, which is highly consistent with the calculation result.
The great orange-red emission intensity was obtained by adjusting the electronic structure and morphology of the YF 3 : x Eu 3+ . The electronic structures of YF 3 : x Eu 3+ can be altered by changing Eu 3+ doping concentrations. The morphologies can be regulated by changing the RE 3+ /NaF ratio. Besides, the formation process of granule-like YF 3 : 0.1Eu 3+ was explored through time-dependent experiments.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Beichen Gao,Limeng Liu,Yinbo Zhao,Jie Wei,Xianghui Yan,Yuhong Chen,Jian Ye,Biao Zhang,Yujin Wang,Feng Ye
α-SiAlON as a solid solution of α-Si 3 N 4 incorporates alien cations (namely Al 3+ and RE v+ , RE = Li, Mg, Ca, and most rare earths) and anion O 2− in the Si 3 N 4 lattice. While effects of the cations on phases, microstructure and mechanical properties of the α-SiAlON ceramics have been well established, possible incorporation of another anion rather than O 2− and its effects are not clear. In this work, Y-doped α-SiAlON ceramics with a nominal composition of Y 0.4 Si 9.6 Al 2.4 O 1.2 N 14.8 were synthesized by hot pressing. Y 2 O 3 in the powder mixture of Si 3 N 4 , AlN, Al 2 O 3 and Y 2 O 3 for synthesis of Y-SiAlON was partially substituted by 2YF 3 to investigate effects of the substitution of F − for O 2− . Density measurement, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Vickers hardness and three-point bending test were performed to characterize the Y-SiAlON ceramics. Thermodynamics of reactions involving YF 3 was also assessed. The results showed that the compositions with 1–50 % 2YF 3 substitution could reach full density, while the 75–100 % 2YF 3 compositions were porous. The SiO 2 impurity present on the Si 3 N 4 particle surface could be eliminated by reaction with YF 3 . When YF 3 was overdosed, formation of YOF liquid would replace the low temperature Al 2 O 3 -Y 2 O 3 -SiO 2 ternary eutectic liquid to hinder α-SiAlON formation, leaving residual Al-O, Al-N, Y-O and Y-F species to form a variety of crystalline intergranular phases. Thin Y-O-F films existed along grain boundaries to impart good corrosion resistance against molten NaOH and better toughening effects to the SiAlON ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 8
·e71145
·
IF 4.2
Ao Shen,Yiguang Jiang,Jiacheng Li,Huidan Zeng,Long Zhang
Gallate glasses hold significant promise for mid-infrared optical applications because of their low phonon energies and broad infrared transmission windows. However, the Ga 2 O 3 –CaO binary system suffers from poor glass-forming ability and high melting temperatures, making it difficult to obtain stable bulk glasses. In this study, YF 3 -regulated 32Ga 2 O 3 -(68- x )CaO- x YF 3 ( x = 0–10 mol%) gallate glasses were synthesized and investigated. The amount of bridging oxygen in the glass network decreases continuously with increase in the YF 3 content. Meanwhile, the glass stability first increases and then decreases. The glass achieves the best stability ( ΔT = 138°C, S = 5.71, H r = 0.474) when the YF 3 content is 8 mol% (GY8). The non-isothermal crystallization kinetics of the GY8 glass were studied based on the classical Johnson–Mehl–Avrami theory. The crystallization activation energies calculated by the Kissinger, Ozawa, and Augis–Bennett equations are in good agreement with each other, and the Avrami exponent calculated by the Matusita–Sakka and Augis–Bennett equations is approximately 3, indicating that the crystallization mechanism of the GY8 glass is either volume nucleation with two-dimensional growth, or three-dimensional growth from a fixed number of pre-existing nuclei. This system guides the design of glass composition and process optimization, thereby providing a theoretical foundation for the preparation of large-sized, highly stable glasses.
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高影响因子
JACS Au
·
2023
·
IF 8
Ping Liang,Yihao Zheng,Fengru Liu,Huaiyu Shao,Chaofan Hu,Bingfu Lei,Xuejie Zhang,Yingliang Liu,Jianle Zhuang,Xingcai Zhang
Carbon dot (CD)-based luminescent materials have attracted great attention in optical anti-counterfeiting due to their excellent photophysical properties in response to ultraviolet-to-visible excitation. Hence, there is an urgent need for the general synthesis of CD-based materials with multimode luminescence properties and high stability; however, their synthesis remains a formidable challenge. Herein, CDs were incorporated into a Yb,Tm-doped YF3 matrix to prepare CDs@YF3:Yb,Tm composites. The YF3 plays a dual role, not only serving as a host for fixing rare earth luminescent centers but also functioning as a rigid matrix to stabilize the triplet state of the CDs. Under the excitation of 365 nm ultraviolet light and 980 nm near-infrared light, CDs@YF3:Yb,Tm exhibited blue fluorescence and green room-temperature phosphorescence of CDs and upconversion luminescence of Tm3+, respectively. Due to the strong protection of the rigid matrix, the stability of CDs@YF3:Yb,Tm is greatly improved. This work provides a general synthesis strategy for achieving multimode luminescence and high stability of CD-based luminescent materials and offers opportunities for their applications in advanced anti-counterfeiting and information encryption.
研究领域:
材料科学
·
光学材料
·
纳米技术
·
防伪技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 20
·6750-6754
·
IF 6.119
Tingshuai Li,Qiru Chen,Jin Yu,Jiaojiao Xia,Yuanfang Li,Ke Xu,Yonglan Luo,Qian Liu,Haoran Guo
Ammonia as a vital chemical is not only indispensable to agriculture but also crucial to some energy devices like fuel cells. However, conventional ammonia production remains energy-intensive and environmentally hostile, and thus electrochemical synthesis of ammonia under mild conditions receives increasing attention. Herein, we report nanoflower-like yttrium fluoride (YF3) as a high-efficiency electrocatalyst for the nitrogen reduction reaction (NRR) for the synthesis of ammonia. Such a catalyst exhibits an ammonia yield rate of 15.5 μg h−1 mgcat−1 and a faradaic efficiency (FE) of 26.2% in 0.1 M Na2SO4, and also shows excellent selectivity and stability. Density functional theory (DFT) calculations indicate that electrons transfer from the NN bond to N–Y and N–H bonds, and the activation of N2 molecules promotes the adsorption of H atoms.
研究领域:
材料科学
·
化学工程
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2026
·
IF 11.8
Ying Hu,Ziyi He,Qijie Yu,Yixiao Deng,Hao Yan,Tinglu song,Chunli Li,Jian Gu,Jin-Cheng Zheng,Yang Dai
Integrating lithium‑rich/nickel-rich high‑voltage cathodes with polycaprolactone‑based all‑solid‑state polymer electrolytes markedly boosts the safety and specific energy of all-solid‑state batteries. However, interfacial incompatibility at high voltages poses a significant challenge for polycaprolactone (PCL)-based all-solid-state polymer electrolytes (SPEs), therefore limiting their pairing in high-voltage cathodes. Herein, YF 3 -improved PCL SPEs are designed for 4.5 V-, and 4.8 V-class all-solid-state lithium metal batteries (ASSLMBs). In modified SPEs, PCL carbonyl groups donate electron density to YF 3 , weakening Li + -polymer coordination and thus promoting ionic conductivity, while YF 3 with Lewis-acid properties simultaneously improves anti-oxidation capability. The optimized membrane delivers 5.1 V oxidative stability, high thermal robustness, and forms stable cathodic and anodic interphases. Remarkably, Ni-rich (NCM9055) cells with the optimized electrolyte achieve 500 cycles at 4.5 V with 69.8% capacity retention, while Li-rich cells sustain 200 cycles at 4.8 V – performance that was previously difficult to achieve. This YF 3 /PCL design validates a practical route and offers a unique dual-interface stabilization strategy for high-voltage ASSLMBs.
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Yuzhu Shen,Wei Sun,Yueheng Zhang,Xiang Xiong,Hongbo Zhang,Ziwei Wang
Ultra-high-temperature ceramic-modified C/C composites are vital for hypersonic vehicles, but their repeated service capability is hindered by oxide-scale degradation during cyclic ablation. This study evaluates the reusability of C/C-ZrC-SiC composites via cyclic oxy-acetylene ablation tests. Three Y-modification configurations were investigated: coating-only, matrix-only, and dual-integration. Results indicate that the dual-modified composite exhibited optimal resistance after three 60 s ablation cycles at ∼2600°C, achieving a linear ablation rate of −0.015 μm/s and a mass ablation rate of −0.016 mg/s (a 108% improvement over the reference). Mechanistically, the YSi 2 -modified coating rapidly formed a viscous Y 2 Si 2 O 7 -containing oxide layer during the initial stage to seal surface defects. In subsequent cycles, YF 3 in the matrix continuously replenishes the damaged scale with Y-containing species, promoting the formation of stable Zr 0 . 82 Y 0 . 18 O 1 . 91 and suppressing the martensitic transformation of ZrO 2 . This internal-external synergistic self-healing mechanism substantially enhances the reusability and long-term reliability of aerospace thermal structural components.
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DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·Vol. 22
·期 6
·e70052
·
IF 2.3
Na Zhang,Min Niu,Lei Su,De Lu,Kang Peng,Hongjie Wang
Si 3 N 4 ceramics stand out as ideal materials for advanced electronic packaging substrates due to their high mechanical strength, high-temperature resilience, and minimal dielectric constant. Optimizing both the mechanical and thermal conductivity is essential for ensuring their reliable performance. In this study, a systematic investigation into the impact of both oxygen-containing sintering additives (Y 2 O 3 -MgF 2 and Y 2 O 3 -MgSiN 2 ) and oxygen-free sintering additives (YF 3 -MgF 2 and YF 3 -MgSiN 2 ) on the microstructure, flexural strength, and thermal conductivity of Si 3 N 4 ceramics has been performed. It demonstrates that the Si 3 N 4 ceramic sintered with the YF 3 -MgSiN 2 additive achieves a remarkable thermal conductivity of 111.63 W·m −1 ·K −1 and a flexural strength of 774.7 MPa, which is relatively rare among the reported Si 3 N 4 ceramics. These exceptional properties are attributed to the use of YF 3 -MgSiN 2 additive, which leads to a significant reduction in lattice oxygen content, along with a decrease in the liquid phase formation temperature, thereby promoting grain development. Furthermore, the decomposition of MgSiN 2 at high temperatures plays a key role in purifying the grain boundaries. This study provides a promising approach for developing high-performance Si 3 N 4 ceramics with excellent thermal conductivity and mechanical strength.
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DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2021
·
IF 4.342
Wennan Su,Xiufang Cui,Guo Jin,Yajie Guan,Yao Zhao,Simin Wan,Changhao Liu,Yuyun Yang,Haoliang Tian
NiTi, NiTi-4Si, and NiTi-4Si-2YF 3 coatings were prepared on Ti-6Al-4V substrate by laser cladding to obtain composite multilayer protective coating for composite structure. The effects of Si and YF 3 addition on the microstructure, phase composition, microhardness , and phase transformation of the coatings were systematically analyzed. The coatings are mainly composed of NiTi, NiTi 2, and TiN phases. The addition of YF 3 results in the decrease of the dendrite TiN phase in the coating. TEM results show that the core-shell structure is observed in NiTi-4Si coating. The β -Ti phase was surrounded by the shell NiTi 2 phase. After the addition of YF 3 , the core-shell structure was found to disappear. With the addition of the Si element, the eutectic structure was found in the coatings. The eutectic structure is mainly composed of NiTi (B2) and Ti 2 Si phases. According to the SEAD result, there are crystallographic orientation relationships (ORs) between NiTi (B2) phase and Ti 2 Si phase as follows: 1 ¯ 11 B 2 / / 1 ¯ 23 Ti 2 Si . The average microhardness of the NiTi, NiTi-4Si and NiTi-4Si-2YF 3 coatings were at 468.33 HV 0.5 , 499.86 HV 0.5 , and 433.65 HV 0.5 , respectively. At the same time, the uniformity of the NiTi phase in NiTi-4Si-2YF 3 coatings is improved, which is conducive to a more complete phase transition.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jie Chen,Chao Wang,Yu Yin,Rong Liu,Fanxu Meng,Shanshan Wang,Zhigang Liu,Shihua Yu
Intelligent regulation of energy transfer process among different rare earth ions doped in the matrix is an effective strategy to realize high-performance upconversion (UC) luminescence. Based on this, wheat ears like Yb 3+ /Er 3+ /(Tm 3+ , Ho 3+ ) triple doped YF 3 microrods were fabricated via hydrothermal method , and the morphology, crystal structure, UC luminescence performance dependent on Tm 3+ /Ho 3+ doping concentrations were studied. By comparing with the Yb 3+ , Er 3+ co-doped YF 3 microrods, the UC luminescence intensity is enhanced in Yb 3+ /Er 3+ /(Tm 3+ , Ho 3+ ) triple doped YF 3 samples due to the cross relaxation processes between Er 3+ and Tm 3+ /Ho 3+ . Moreover, red emission is enhanced more significantly than green emission in YF 3 : Yb 3+ , Er 3+ , Tm 3+ , which is contrary to that in YF 3 : Yb 3+ , Er 3+ , Ho 3+ . The possible energy transfer upconversion mechanism involved is discussed in detail. Meanwhile, an adjustable emission color is easy to achieve via altering the doped Er 3+ /Tm 3+ /Ho 3+ ion concentration . These studies on the UC luminescence enhancement mechanism of Yb 3+ /Er 3+ /(Tm 3+ , Ho 3+ ) triple doped YF 3 microrods are expected to provide a reference for the development of high-efficiency luminescent materials .
研究领域:
材料科学
·
光学材料
·
光子学
·
稀土掺杂
·
纳米光子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tengyu Zhang,Meijia Liu,Can Li,Jiwei Zhang,Hui Gao,Fangong Kong,Xuezhang Xiao
Magnesium hydride (MgH 2 ) emerges as a cost-effective and high-capacity hydrogen storage candidate. Despite these advantages, its utilization is constrained by sluggish reaction kinetics and the requirement for elevated operating temperatures. In this study, we aim to address these limitations by investigating the synergistic catalytic effect of yttrium fluoride (YF 3 ) and nickel-loaded nitrogen self-doped porous carbon (Ni/C) as catalysts for MgH 2 . Co-doping with YF 3 and Ni/C reduces the dehydrogenation activation energy to 74.56 kJ/mol, enabling 5.22 wt% H 2 desorption within 5 min at 300 °C. Notably, the system exhibits enhanced low-temperature reaction kinetics, with the MgH 2 -YF 3 + Ni/C composite releasing 5.74 wt% H 2 at 250 °C within 30 min. At 50 °C, the co-doped composite achieves a hydrogen storage capacity of 5.18 wt% within 4 h, whereas the composite with Ni/C only absorbs 3.72 wt% H 2 . Moreover, the MgH 2 -YF 3 + Ni/C shows 98.4 % capacity retention after 30 cycles, indicating excellent reversibility. Mechanistic analysis reveals that the outstanding catalytic performance originates from the synergistic effect among YH 2 /YH 3 , MgF 2 , Mg 2 Ni/Mg 2 NiH 4 , and nitrogen-doped carbon. YH 2 /YH 3 and Mg 2 Ni/Mg 2 NiH 4 act as “hydrogen pump”, providing more active sites for the reaction. Additionally, MgF 2 functions as an electron transfer medium, weakening the Mg-H bond. The introduction of nitrogen self-doped porous carbon improves the dispersion of the catalyst and prevents aggregation, enhancing the dissociation of hydrogen molecules. This work demonstrates a promising strategy for improving the low-temperature hydrogen storage performance of MgH 2 and offers insights into the design of rare-earth fluoride-based catalysts.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 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）