JOURNAL OF RARE EARTHS
·
2015
·Vol. 33
·期 9
·927-932
·
IF 1.261
Hailong PENG,Qiangsheng GAO,Lili MENG,Lixia ZHANG,Qi PANG,Lifang LIANG
Ca 12 Al 14 O 32 F 2 :Eu 3+ red phosphors were prepared by the sol-gel method with CF 3 COOH as the fluorine source. X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectra, and photoluminescence spectra, as well as thermogravimetric and differential thermal analysis were utilized to characterize the samples. All the samples were single phase with a cubic structure. The as-obtained Ca 12 Al 14 O 32 F 2 :Eu 3+ red phosphors consisted of nanoparticles with sizes of approximately 40–100 nm. Under the excitation of UV light, Ca 12 Al 14 O 32 F 2 :Eu 3+ exhibited the characteristic emissions of Eu 3+ , and the effect of annealing temperature, annealing time, and CF 3 COOH and Eu 3+ concentrations on the luminescence intensity were discussed in detail.
研究领域:
材料科学
·
无机化学
·
发光材料
·
纳米材料
·
固体化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2026
·Vol. 17
·期 1
·1909
·
IF 15.7
Yang Bin,Li Deyang,Deng Renren,Zhao Jian,Wang Yubin,Xu Shiqing,Lei Lei
Persistent luminescence materials are promising for night-vision displays, background-free medical diagnostics, and high-resolution radiography, yet achieving efficient violet, yellow, and red emission within a single robust and scalable host remains a longstanding challenging. Here, we overcame this limitation by constructing Gd 3+ -mediated cluster traps within alkaline-earth fluorochlorides to minimize energy loss during electron migration. These clusters serve as both intrinsic emitters and efficient energy transfer platforms for various activators, including Eu 2+ , Sm 2+ , Tb 3+ , and Mn 2+ , enabling bright and spectrally tunable multicolor persistent luminescence upon X-ray irradiation. The persistent luminescence intensity of Eu 2+ is enhanced by up to 32.7-fold upon Gd 3+ codoping. Moreover, violet persistent luminescence from Eu 2+ is employed to excite perovskite quantum dots for full-color time-domain dynamic displays, while Sm 2+ emission facilitates low-dose, high-resolution delayed X-ray imaging. These findings establish a generalizable strategy for designing efficient multicolor persistent materials for advanced multifunctional optical technologies.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2026
·
IF 10.1
Jun Zhang,Ying Qiu,Chengyu Li,Rui Shan,Haoran Yuan,Yong Chen
Although the resource utilization of antibiotic residues attracts great interest, the potential application in transfer hydrogenation of platform molecules has barely been reported. Here, we firstly reported the fabrication of antibiotic residues derived carbonaceous materials (AR-T) for catalytic transfer hydrogenation of bio-based furfural into furfuryl alcohol. The in-situ generated acid-base sites in porous AR-T significantly contributed to the Meerwein-Ponndorf-Verley reduction of furfural, which finally gave high furfuryl alcohol yield of 91.0 mol% and low activation energy of 41.4 kJ/mol using isopropanol as both the hydrogen source and solvent. The isopropanol with low reduction potential presented excellent hydrogen donating capacity for furfural hydrogenation. A plausible reaction mechanism for furfural-to-furfuryl alcohol transformation via the cooperative effect of acid-base sites in isopropanol over as-prepared AR-T was also proposed. The techno-economic assessment clearly substantiated the feasibility and economy of AR-T for transfer hydrogenation of furfural, where the total revenue for producing 1 kg furfuryl alcohol achieved $19.8 kg −1 and outperformed the state-of-the-art transition metal catalysts mediated furfural hydrogenation. The present study not only provides an approach for the green and highly efficient utilization of antibiotic residues but also opens novel cost-effective avenues for realizing the catalytic upgrading of bio-based platform oxygenates into value-added chemicals.
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 2
·167
·
IF 4.5
Zhipeng Su,Xueyin Zhang,Tiehong Chen
Pd-based catalysts with different Pd species (Pd ions, Pd clusters, and Pd nanoparticles) in USY were synthesized for naphthalene hydrogenation reaction. Among the catalysts, Pd clusters were prepared by controlled aggregation of Pd ions during the hydrogenation reaction with the assistance of physically adsorbed water in zeolite micropore. The coordination state and electronic structure of Pd species on these catalysts were analyzed to reveal the structure–performance relationship. Due to the high dispersion and optimized electronic structure, Pd clusters showed the highest activity for naphthalene hydrogenation compared to Pd ions and Pd nanoparticles.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Yi Hu,Yi Wang,Hengwei Lin,Jiaren Du
Multiband persistent luminescent materials offer distinctive opportunities for advanced optical information technologies by enabling time-resolved and spectrally encoded signal expression. However, most multiband persistent luminescent systems reported so far are restricted to the visible and near-infrared regions, while the incorporation of ultraviolet (UV) afterglow remains highly challenging despite its intrinsic advantages in concealment and background-free readout. In this work, a defect-assisted dopant engineering strategy is developed by introducing Gd3+ into CaF2/Tb3+, enabling the simultaneous generation of UV and visible persistent luminescence within a single wide-bandgap fluoride host. Further investigations reveal that Gd3+ codoping induces abundant vacancy-related traps with suitable depth, which effectively facilitate charge storage and controlled release, while simultaneously acting as UV emission centers coupled with Tb3+-based visible emission. As a result, stable UV–visible dual-band afterglow is achieved, in which Gd3+-related UV emission and Tb3+-based visible emission coexist and can be selectively accessed for multichannel optical information storage and anticounterfeiting applications. More importantly, this work provides a feasible design strategy for incorporating UV emission into persistent luminescent systems, which is expected to promote the development of multiband long-lasting emissive materials spanning UV to near-infrared spectral regions.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Haotong Wang,Ran Zhao,Zhongshuai Jia,Yusheng Yang,He Sun
Compared to conventional carbothermic reduction or aqueous electrolysis, molten oxide electrolysis (MOE) promises efficient metal extraction, improved environmental outcomes, and adaptability to diverse mineral feedstocks. A critical challenge is identifying refractory ceramics that enable a feasible, durable MOE process. In this work, the erosion behaviors of four refractories, BN, Si 3 N 4 , ZrO 2 , and SiC, are investigated in a molten CaO-SiO 2 -TiO 2 -Nb 2 O 5 -Fe 2 O 3 -CaF 2 slag from Bayan Obo tailings. Combining thermodynamic calculations with in situ observation via high-temperature confocal laser scanning microscopy, the erosion resistance of four ceramic materials was evaluated. It is found that ZrO 2 , BN, and Si 3 N 4 ceramics suffer severe degradation in the molten slags, whereas SiC maintains better stability. SiC was fabricated into crucibles to study the erosion process by the static crucible method. It is found that a dense protective layer dominated by TiC/NbC is formed on the surface of SiC, effectively inhibiting further penetration and erosion of molten slags. This explains why the actual corrosion resistance of silicon carbide in molten slag significantly outperforms theoretical predictions based on thermodynamic equilibrium calculations. The erosion rate of the SiC crucible is calculated to be 4.78 mg h −1 . These findings provide direct guidance for selecting refractories for MOE and advancing sustainable metallurgy.
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2026
·
IF 6
Shaoyang Chang,Boqi Wang,Mingjun Rao,Zhao Yang,Zhongshuai Jia,Haijiao Xie
This study proposes a crystal-phase-mediated strategy for the efficient synthesis of niobium carbide (NbC) from model niobium-bearing phases. By investigating the different carbonization behaviors of four representative niobium phases (niobium oxide, pyrochlore, columbite, and aeschynite), pyrochlore exhibited optimal carbonization capability due to its lowest activation energy (84.4 kJ·mol −1 ) and low Nb-O bond strength. We employed CaF 2 and Na 2 CO 3 as additives to convert refractory phases into a highly reactive pyrochlore intermediate (NaCaNb 2 O 6 F), achieving a conversion ratio of over 93% below 1100 ℃. This intermediate enables the efficient in situ synthesis of NbC with a carbonization ratio exceeding 92% at 1100 ℃ (based on selective leaching, estimated error ± 5%), about 200 ℃ lower than in direct carbonization. This additive-induced phase transformation pathway significantly lowers the energy barrier for NbC production, demonstrating a potential low-temperature pathway that may inform future strategies for the synthesis of niobium carbide, though further validation on natural ores is required.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Wentao Guo,Xi Lan,Yongli Jin,Ziqi Ding,Jintao Gao,Zhancheng Guo,Zengwu Zhao
The irreplaceability role of rare earths in high-performance materials, such as ceramics, highlighting the significance of rare earth extraction. Strengthening the crystallization growth of the rare earth phase in rare earth slag is crucial for ensuring effective subsequent rare earth enrichment and separation. However, viscosity plays a major role in the characteristics of high-temperature melts and the crystallization process. In this study, an internal column rotation method was used to measure the viscosity of CaO-SiO 2 -CaF 2 -Ce 2 O 3 slag melts. The effect of shear rate on the rheological behavior of CaO-SiO 2 -CaF 2 -Ce 2 O 3 slag with varying Ce 2 O 3 and CaF 2 contents, and CaO/SiO 2 ratio was investigated by examining the viscosity evolution during the rare earth crystallization growth process. The rheological behavior of the CaO-SiO 2 -CaF 2 -Ce 2 O 3 slag was elucidated in regions of liquid phase, low solid phase, and high solid phase, providing insight into the viscosity changes of non-Newtonian flowing melts. Based on this, the effect of shear rate on the crystallization behavior of rare earth phases was investigated to provide a basis for improving the subsequent separation of rare earth phases.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Guanting Liu,Xiao Yang
High-purity white phosphorus can be produced by dissolving phosphate rock in molten CaCl 2 and subsequently electrolyzing phosphate ions in the melt. This method is anticipated to address the technical challenges associated with the conventional carbothermal process, including high energy consumption, significant pollution, and low product purity. This paper systematically investigated the dissolution mechanism of fluorapatite [Ca 5 (PO 4 ) 3 F, the principal phase in phosphate rock] in molten CaCl 2 , as well as the influence of fluorine ions on the dissolution and electrolysis processes. The findings revealed that the solubility of Ca 5 (PO 4 ) 3 F in molten CaCl 2 increased with temperature, and the dissolution process was endothermic, with a standard dissolution enthalpy of 73755.9 J mol⁻¹ K⁻¹ over a temperature range of 1073 K to 1273 K. The diffusion of phosphate ions in the melt significantly influenced the dissolution rate, which can be enhanced through improved mass transfer. During the dissolution process, Ca 5 (PO 4 ) 3 F initially dissociated into Ca 5 (PO 4 ) 3 Cl and CaF 2 , followed by the transformation of Ca 5 (PO 4 ) 3 Cl into Ca 2 PO 4 Cl. The presence of CaF 2 increased the solubility of phosphorus, slightly reduced the dissolution rate, and had minimal impact on the electrochemical reduction of phosphate ions. High-purity white phosphorus was successfully prepared through electrolysis in a molten CaCl 2 -CaF 2 dissolving phosphate rock, demonstrating superior quality compared to industrial-grade phosphorus products. These results provide a comprehensive understanding of the electrochemical preparation of white phosphorus and highlight its potential for promoting the green and sustainable development of the phosphorus chemical industry.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Yaning Liu,Da Yang,Rui Xu,Yijue Wang,Liuyi Hu,Tianqi Yang,Min Fan,Meiqing Feng,Jianping Xu,Zhen Xiao,Ruyi Fang,Jun Zhang,Xinhui Xia,Hui Huang,Xiayin Yao,Wenkui Zhang,Yang Xia
The advancement of all-solid-state lithium metal batteries (ASSLMBs) with high energy density is significantly constrained by the inherent drawbacks of solid polymer electrolytes (SPEs), such as low room-temperature ionic conductivity, inadequate mechanical strength to prevent lithium dendrite growth, and unstable interfaces between electrodes and electrolytes.To overcome these limitations, this study introduces a synergistic modification strategy for poly(ethylene oxide) (PEO)-based SPEs by incorporating calcium fluoride (CaF2), aiming to concurrently improve bulk electrolyte properties and interfacial stability. The introduction of CaF2 effectively inhibited the crystallization of PEO by steric hindrance and Lewis acid, which made the ionic conductivity of the electrolyte reach 8.49 × 10-5 S cm-1 at 40°C (70% higher than that of the original electrolyte) and the lithium-ion migration number increased to 0.34.The composite electrolyte also demonstrates improved mechanical robustness (yield strength of 1.61 MPa) and electrochemical stability window (with decomposition voltage elevated to 5.01 V), enabling a critical current density of 0.8 mA cm-2 . Theoretical and experimental investigations reveal that CaF2 promotes the formation of a hybrid solid electrolyte interphase (SEI) enriched with LiF and Ca-Li alloys, which guides uniform lithium deposition. As a result, Li symmetric cells achieve stable cycling over 1600 hours, and LiFePO4||Li full cells retain 98.1% of their initial capacity after 300 cycles at 0.5 C. This work offers a scalable pathway for designing dendrite-suppressing SPEs through dual optimization of bulk and interfacial characteristics.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2026
·
IF 4.7
Xu Zhang,Zengwu Zhao,Liqi Zhang,Bowen Huang,Yusheng Yang
Numerous undeveloped and underutilized niobium deposits are located inside Bayan Obo's tailings. Niobium is challenging to extract from low-grade niobium slag using traditional methods. In this work, molten oxide electrolysis was used to prepare metallic niobium and niobium-iron alloys. Our findings reveal that the reduction of Nb(V) on a tungsten electrode operates through a two-step, five-electron transfer process: Nb(V) → Nb(II) and Nb(II) → Nb(0). Meanwhile, on an solid iron electrode, the reduction follows a three-step process: Nb(V) → Nb(IV), Nb(IV) → Nb(II) and Nb(II) → Nb(0). In the co-deposition approach, Fe(III) is first deposited on the tungsten electrode to form a Fe film through the reaction Fe(III) + 3e → Fe(0). Subsequently, Nb(V) is reduced on this iron film, yielding NbFe intermetallic compounds. Additionally, we examined the transport and diffusion rates of Nb ions as they transition to Nb(0) on inert tungsten, solid iron, and during co-deposition. The results highlight that the co-deposition method yields FeNb and Fe 2 Nb alloys that are easier to separate and demonstrate superior diffusivity, with D Nb(II) measured at 1.80×10 -5 cm 2 s -1 during the reduction process. This research highlights a promising pathway toward enhancing niobium production and utilization in high-demand industries.
✓ 已验证
产品关联
DOI
高影响因子
CHEMPHYSCHEM
·
2026
·Vol. 27
·期 12
·e70469
·
IF 2.4
Liqi Zhang,Xu Zhang,He Sun,Yusheng Yang
Molten oxide–fluoride electrolysis enables direct metal extraction from ores while producing only oxygen. Titanium and its alloys are highly valued for their exceptional high- and low-temperature properties, enabling broad applications in metallurgy and other fields. However, the direct electrolytic deposition of titanium from its oxides via molten oxide electrolysis is a significant challenge. This article systematically investigates the limitations of this process in a CaF 2 –CaO–TiO 2 melt. Electrochemical experiments were conducted using tungsten and iron electrodes with Fe 2 O 3 deposition; in all cases, no significant metallic titanium deposition was observed. Cyclic and square-wave voltammetry analyses revealed a multistep reduction mechanism. Results show negligible Ti deposition on the W electrode and only micrometer-thick layers on the Fe electrode or with Fe 2 O 3 . The primary limiting factors are the following: (1) The reduction rate of titanium ions is close to the dissolution rate of metallic titanium (both ~10 −4 cm·s −1 ) and (2) rapid formation of CaTiO 3 passivates the cathode, impeding continuous Ti deposition, with CaTiO 3 reduction as the rate-controlling step. This article clarifies the fundamental barriers to efficient Ti extraction via molten oxide–fluoride electrolysis and offers strategic insights for optimizing titanium metallurgy from mineral sources. Graphical This article reveals two fundamental barriers to titanium extraction from CaF 2 –CaO–TiO 2 melts: rapid cathode passivation by a dense CaTiO 3 layer and a kinetic balance where Ti reduction and dissolution rates are comparable. Even Fe electrodes or Fe 2 O 3 addition yield only micrometer-thick Ti–Fe layers, highlighting critical limitations for molten oxide–fluoride electrolysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）