Journal of Rare Earths最新文献_第2页

Enhancing luminescence through cationic substitution: Synergistic effects of lattice distortion and rigidity augmentation in Sm3+-doped composite perovskite for versatile applications 通过阳离子取代增强发光：Sm3+掺杂复合钙钛矿中晶格畸变和刚性增强的协同效应

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-03-26 DOI: 10.1016/j.jre.2025.03.029

Xingyang Peng, Ruirui Cui, Xiang Guo, Xinyong Gong, Chaoyong Deng

Although significant progress has been made in the development of red phosphors, the development of efficient and thermally stable red phosphors remains a challenge. In this paper, (Sr_3–yCa_y)Ca_1–xNb₂O₉:xSm³⁺ phosphors with 648 nm red emission, which belongs to the ⁴G_5/2 → ⁶H_9/2 leap of Sm³⁺ and is close to the absorption wavelengths of plant chlorophylls and photochromes P_R, were prepared by the high-temperature solid-phase method. The lattice mismatch between Sm³⁺ and Ca²⁺ is solved by cation substitution, which increases the atomic disorder and lattice distortion, and the lattice distortion also causes the forbidden leap to be disrupted, thus improving the luminescence efficiency. Meanwhile, the substitution of small-radius cations leads to the enhancement of the structural rigidity of the material. The test results show that after the introduction of Ca²⁺, the luminous intensity of the phosphor is increased by 5.15 times, the quantum yield is increased from 22.89% to 48.31%, and the I_{423 K}/I_{298 K} value is increased from 70.7% to 73.4%, and the fluorescence lifetime is also improved accordingly. White light-emitting diodes (WLEDs) and fuchsia light-emitting diodes (LEDs) were successfully prepared using the experimentally prepared phosphors, demonstrating their great potential in the fields of optical thermometers, WLEDs and plant growth.

尽管红色荧光粉的研究取得了重大进展，但开发高效且热稳定的红色荧光粉仍然是一个挑战。本文采用高温固相法制备了648 nm的（Sr3-yCay） Ca1-xNb2O9:xSm3+荧光体，该荧光体属于Sm3+的4G5/2→6H9/2跃迁，接近植物叶绿素和光致色素PR的吸收波长。Sm3+和Ca2+之间的晶格失配通过阳离子取代来解决，这增加了原子的无序性和晶格畸变，晶格畸变也导致禁跃迁被破坏，从而提高了发光效率。同时，小半径阳离子的替代提高了材料的结构刚度。测试结果表明，引入Ca2+后，荧光粉的发光强度提高了5.15倍，量子产率从22.89%提高到48.31%，I423 K/I298 K值从70.7%提高到73.4%，荧光寿命也相应提高。利用实验制备的荧光粉成功制备了白色发光二极管和紫红色发光二极管，显示了其在光学温度计、发光二极管和植物生长等领域的巨大潜力。

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引用次数: 0

Synthesis, characterization and application of copper-ceria catalysts for catalytic elimination of air pollutants: A review 铜-铈催化去除空气污染物催化剂的合成、表征及应用综述

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-09-10 DOI: 10.1016/j.jre.2025.09.014

Yibo Mu , Xiuwen Wang , Yirui Yang , Wu Gao , Bifeng Zhang , Kaili Ma , Annai Liu , Wei Tan , Lin Dong

Ce and its oxide (CeO₂) have garnered extensive research attention in catalytic elimination of various air pollutants owing to their superior redox performance and oxygen storage capacity, which might originate from the overlap of Ce 4f-5d atomic orbitals, as depicted in Cotton atomic orbital energy level diagram. To further tap the potential of CeO₂, strategic integration with diverse transition metals and noble metals has been implemented. The distinctive nature of Cu in forming strong interactions with CeO₂, coupled with its economic viability, has propelled substantial investigations into CuO-CeO₂ composite catalysts for air pollutant removal. In this review, starting from a discussion on the classical dispersion model of Cu on CeO₂, the current development in the synthesis and characterization of CuO-CeO₂ catalysts is systematically summarized. Subsequently, the application of CuO-CeO₂ catalysts in several common air pollutant elimination-related reactions (e.g., CO oxidation, NO reduction by CO, NH₃-SCR and NH₃-SCO) is discussed in depth. The review can provide significant guidance for the rational engineering of high-efficiency CuO-CeO₂ catalysts.

Ce及其氧化物（CeO2）由于其优越的氧化还原性能和储氧能力，在催化消除各种空气污染物方面获得了广泛的研究关注，这可能源于Ce 4f-5d原子轨道的重叠，如Cotton原子轨道能级图所示。为了进一步挖掘CeO2的潜力，我们实施了与多种过渡金属和贵金属的战略整合。Cu与CeO2形成强相互作用的独特性质，加上其经济可行性，推动了对CuO-CeO2复合催化剂去除空气污染物的大量研究。本文从Cu在CeO2上的经典分散模型出发，系统地综述了Cu -CeO2催化剂的合成和表征的研究进展。随后，深入讨论了CuO-CeO2催化剂在几种常见的空气污染物消除相关反应（如CO氧化、CO还原NO、NH3-SCR和NH3-SCO）中的应用。该综述可为高效CuO-CeO2催化剂的合理工程化提供重要指导。

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引用次数: 0

Porous Ce-doped Bi2O3 pollen biomorphic photocatalyst with high specific surface area and oxygen vacancies for efficient degradation of tetracycline 具有高比表面积和氧空位的多孔掺铈Bi2O3花粉生物形态光催化剂，用于高效降解四环素

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-03-29 DOI: 10.1016/j.jre.2025.03.032

Shulin Kong , Tong Zhang , Yan He , Yao Zhou , Guanghan Yan , Minsheng Huang

Visible light photocatalytic degradation is a promising advanced oxidation process for the removal of antibiotics in wastewater. However, this technology currently has problems that are not suitable for large-scale applications, mainly due to the high cost of development and preparation of efficient photocatalysts. Therefore, the preparation of low-cost, high-efficiency and environmentally friendly semiconductor photocatalysts is still a hot research topic. In this study, rare earth metal Ce-doped porous Bi₂O₃-based biomorphic photocatalysts were prepared by a combination of solvothermal method and template method using natural rapeseed pollen as a green template. Ce/Bi₂O₃ synthesized by the optimal process shows a pollen-shaped porous structure with high dispersion and integrity, high purity and large specific surface area. Ce in the catalysts with different doping amounts coexists in two mixed valence states of Ce⁴⁺ and Ce³⁺, and Ce doping increases the percentage of oxygen vacancies. The higher specific surface area of the catalyst also provides more active sites and reaction surface area. When the doping amount of Ce is 5 mol%, the efficiency of tetracycline hydrochloride (TCH) degradation under visible light can reach more than 96% after 180 min. The rate constant is 6.37 times higher than that of commercially available Bi₂O₃ (CHB). Through the analysis of intermediate products, the possible degradation path of TCH is obtained, and the phenomenon of intermediate accumulation in the initial stage was explored. The prepared photocatalysts have excellent stability and high reusability, and have a large advantage in comprehensive economy. Therefore, this study provides a reference for the preparation of low-cost rare earth metal doped photocatalysts with special morphology for the degradation of antibiotic wastewater.

可见光光催化降解是一种很有前途的去除废水中抗生素的高级氧化工艺。然而，该技术目前存在不适合大规模应用的问题，主要原因是高效光催化剂的开发和制备成本高。因此，制备低成本、高效、环保的半导体光催化剂仍是一个热门的研究课题。本研究以天然油菜籽花粉为绿色模板，采用溶剂热法和模板法相结合的方法制备了稀土金属ce掺杂多孔bi2o3基生物形态光催化剂。通过优化工艺合成的Ce/Bi2O3具有花粉状多孔结构，分散性和完整性高，纯度高，比表面积大。不同掺杂量的催化剂中Ce以Ce4+和Ce3+两种混合价态共存，Ce的掺杂增加了氧空位率。催化剂的高比表面积也提供了更多的活性位点和反应表面积。当Ce掺杂量为5 mol%时，180 min后，可见光下对盐酸四环素（TCH）的降解效率可达96%以上。反应速率比市售Bi2O3 （CHB）高6.37倍。通过对中间产物的分析，得出了TCH可能的降解路径，并对TCH初始阶段的中间产物积累现象进行了探讨。制备的光催化剂稳定性好，可重复使用性高，具有较大的综合经济优势。因此，本研究为制备具有特殊形貌的低成本稀土金属掺杂光催化剂降解抗生素废水提供了参考。

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引用次数: 0

S-scheme heterojunction of CeVO4/Zn0.1Cd0.9S for enhanced photocatalytic hydrogen evolution CeVO4/Zn0.1Cd0.9S的s型异质结增强光催化析氢

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-04-10 DOI: 10.1016/j.jre.2025.03.031

Chaoyue Zheng , Teng Li , Youlin Wu , Jihuai Wu , Canzhong Lu , Yiming Xie

The process of utilizing solar-driven semiconductor water splitting for the production of hydrogen is a vital strategy in the pursuit of a zero-carbon economy. Zn_0.1Cd_0.9S, a rod-like semiconductor metal sulfide, encounters considerable difficulties stemming from the swift recombination of charge carriers generated by light. Overcoming the coulombic interactions between charge carriers is essential for achieving efficient separation. In this study, we modified Zn_0.1Cd_0.9S with dodecahedral rare-earth compound CeVO₄ and employed ultrasonic self-assembly to tightly couple the two materials. This integration established a built-in electric field and constructed an S-scheme heterojunction. Within this configuration, Zn_0.1Cd_0.9S serves as an electron acceptor while CeVO₄ functions as an electron donor. Driven by the built-in electric field, electrons rapidly traverse the tightly coupled interface, minimizing their path length. The S-scheme heterojunction preserves the catalyst's strong redox capabilities and facilitates the vectorial separation of photogenerated charge carriers. In situ irradiated X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analyses further validated the charge transfer mechanism of the S-scheme heterojunction. Density functional theory calculations elucidated the electronic states and roles of the catalyst, thereby establishing a theoretical framework for the investigation of S-scheme heterojunctions. This work lays a theoretical basis for the design and mechanistic investigation of S-scheme heterojunction catalysts.

利用太阳能驱动的半导体水分解生产氢气的过程是追求零碳经济的重要战略。Zn0.1Cd0.9S是一种棒状半导体金属硫化物，由于光产生的载流子的快速重组，它遇到了相当大的困难。克服载流子之间的库仑相互作用是实现有效分离的必要条件。在本研究中，我们用十二面体稀土化合物CeVO4修饰Zn0.1Cd0.9S，并采用超声波自组装将两种材料紧密耦合。这种集成建立了内置电场，并构建了s型异质结。在该构型中，Zn0.1Cd0.9S作为电子受体，CeVO4作为电子给体。在内置电场的驱动下，电子快速穿过紧密耦合的界面，使其路径长度最小化。s型异质结保留了催化剂的强氧化还原能力，促进了光生载流子的矢量分离。原位辐照x射线光电子能谱（XPS）和电子顺磁共振（EPR）分析进一步验证了s型异质结的电荷转移机理。密度泛函理论计算阐明了催化剂的电子态和作用，从而为研究s型异质结建立了理论框架。该工作为s型异质结催化剂的设计和机理研究奠定了理论基础。

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引用次数: 0

A versatile heat-resistant barium phosphate phosphor: Dy3+–Eu3+ energy transfer and tunable emission 一种多功能耐热磷酸钡荧光粉：Dy3+ -Eu3 +能量转移和可调发射

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-02-14 DOI: 10.1016/j.jre.2025.02.001

Asif Ali Haider , Xiaoyang Zhao , Lixin Liu , Zibo Huang , Jingkai Quan , Youwen Tang , Yue Qin , Xiaoting Huang , Yanqiong Shen , Jing Zhu

As the demand for versatile phosphors in lighting, security, and information display technologies continues to increase, achieving stable luminescence and adaptable multicolor outputs has become increasingly paramount and urgent. In this study, a Dy³⁺–Eu³⁺ energy transfer was constructed in a barium phosphate Ba₅P₆O₂₀ matrix, allowing for tunable emission with the blue/yellow parts from Dy³⁺ (⁴F_9/2 → ⁶H_15/2/⁶H_13/2) and the red parts from Eu³⁺ (⁵D₀→⁷F_2,3,4). The energy transfer mechanism, color tunability, and heat-resistant ability were thoroughly elucidated. As a representative, the BPO:0.05Dy³⁺,0.08Eu³⁺ phosphor exhibits multicolor emission behavior under different excitations. Meanwhile, at temperatures up to 473 K, the luminescence intensity remains over 90% of the initial level. Subsequently, phosphor-based white lighting, latent fingerprint visualization, and UV-responsive signage applications were successfully developed. These findings confirm the potential of Dy³⁺–Eu³⁺ energy transfer method to obtain versatile phosphors.

随着照明、安全和信息显示技术对多功能荧光粉的需求不断增加，实现稳定的发光和可适应的多色输出变得越来越重要和紧迫。在本研究中，在磷酸钡Ba5P6O20基质中构建了Dy3+ -Eu3 +的能量转移，实现了Dy3+的蓝/黄部分（4F9/2→6H15/2/6H13/2）和Eu3+的红部分（5D0→7F2,3,4）的可调谐发射。对其能量传递机理、颜色可调性和耐热性进行了深入研究。作为代表，BPO:0.05Dy3+，0.08Eu3+荧光粉在不同激发下表现出多色发射行为。同时，在温度高达473 K时，发光强度保持在初始水平的90%以上。随后，成功开发了基于磷的白色照明、潜在指纹可视化和紫外线响应标牌应用。这些发现证实了Dy3+ -Eu3 +能量转移法获得多功能荧光粉的潜力。

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引用次数: 0

Unveiling NOx elimination performance on a Ce-based AdSCR catalyst 揭示了ce基AdSCR催化剂的NOx消除性能

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-03-22 DOI: 10.1016/j.jre.2025.03.021

Yuxin Fan , Yan Huang , Shuang Liu , Tao Lin , Jianli Wang , Yaoqiang Chen , Haidi Xu

In order to prevent the emission of NO_x from diesel engines during the cold-start period, a NO_x adsorption selective catalytic reduction (AdSCR) catalyst was prepared by combining a selective catalytic reduction (SCR) catalyst with an NO_x adsorbent. In this study, CeO₂/Al₂O₃ (Ce/Al) was employed as the NO_x adsorbent, combined with WO₃/CeZrO_x (W/CZ) as a promising SCR catalyst, to prepare an AdSCR catalyst. The characterization results demonstrate that the synergistic effects of the combined catalyst significantly enhance the activated oxidation of NO_x in comparison to the individual catalysts. The addition of Ce/Al enhances the adsorption of NO_x on the catalysts, which is then reduced to N₂ and H₂O by NH₃ under the action of W/CZ catalysts. The results of the NH₃-SCR activity test indicate that an excess of Ce/Al results in a reduction in SCR performance, suggesting that there is a balance between the SCR component and the NO_x adsorbent. The optimal combination of 20 wt% Ce/Al + W/CZ (20CA-W/CZ) catalyst demonstrates enhanced NO_x adsorption-storage performance while maintaining the exceptional NH₃-SCR performance. The NO_x complete storage time of the 20CA-W/CZ catalyst is 125 s, which is nearly twice as long as that of the Ce/Al and W/CZ catalysts. Furthermore, the NO_x conversion of the 20CA-W/CZ catalyst at low temperatures is approximately 10% higher than that of the W/CZ catalyst. The findings of this study offer a promising strategy for the design of high-performance AdSCR catalysts in the future.

为了防止柴油机冷启动期间NOx的排放，将选择性催化还原（selective catalytic reduction， SCR）催化剂与NOx吸附剂相结合，制备了NOx吸附选择性催化还原（AdSCR）催化剂。本研究采用CeO2/Al2O3 （Ce/Al）作为NOx吸附剂，与WO3/CeZrOx （W/CZ）作为前景看好的SCR催化剂，制备AdSCR催化剂。表征结果表明，与单个催化剂相比，组合催化剂的协同作用显著增强了NOx的活性氧化。Ce/Al的加入增强了催化剂对NOx的吸附，在W/CZ催化剂的作用下，NOx被NH3还原为N2和H2O。NH3-SCR活性测试结果表明，过量的Ce/Al会导致SCR性能下降，这表明SCR组分与NOx吸附剂之间存在平衡。20wt % Ce/Al + W/CZ （20CA-W/CZ）催化剂的最佳组合在保持优异的NH3-SCR性能的同时，增强了NOx的吸附-储存性能。20CA-W/CZ催化剂的NOx完全贮存时间为125 s，是Ce/Al和W/CZ催化剂的近2倍。此外，在低温下，20CA-W/CZ催化剂的NOx转化率比W/CZ催化剂高约10%。本研究结果为未来高性能AdSCR催化剂的设计提供了一个有希望的策略。

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引用次数: 0

Kinetic enhanced separation via interfacial competitive salt effect: A novel insight into the role of coexisting background ions during thin-layer organic film extraction 通过界面竞争盐效应的动力学增强分离：对薄层有机膜萃取过程中共存背景离子作用的新见解

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-06-04 DOI: 10.1016/j.jre.2025.06.002

Shaoping Feng , Gaozhang Gou , Kun Huang

Understanding the underlying mechanism that enhances the separation of specific target ions from complex background aqueous solutions is crucial for achieving controllable chemical reactions and industrial purification processes in modern industries. This study investigated the enhanced kinetic separation of target metal ions from complex aqueous solutions at a liquid–liquid interface, focusing on the presence of coexisting salt cations. Employing a typical thin-layer organic oil film (TOOF) extraction as a model system, the research examines how background Al³⁺ ions influence the mass transfer and separation of Er³⁺ ions. Notably, the concentration of Al³⁺ ions affects both the distribution of Er³⁺ ions at the oil–water interface and the arrangement and orientation of P507 extractant molecules through the formation of unique hydrogen-bonding interactions. These interactions influence the selectivity of mass transfer, facilitating the separation of Er³⁺ from Al³⁺ ions. Specifically, the hydration shell of Er³⁺ ions is disrupted due to the strong hydration capability of coexisting Al³⁺ ions, leading to a higher interfacial concentration of Er³⁺ ions and a more ordered interfacial orientation of P507 molecules. At lower concentrations of Al³⁺ ions, the diffusion rate of Er³⁺ ions near the interface is high, enhancing the separation performance of these ions. In contrast, at higher concentrations of Al³⁺ ions, the competitive hydration by Al³⁺ ions increases, and the interfacial concentration of Er³⁺ ions decreases due to enhanced diffusion resistance, resulting in poorer separation performance. Furthermore, a thinner membrane is more effective than a thicker one in enriching target Er³⁺ ions at the interface and achieving an ordered interfacial orientation of P507 molecules, thereby enhancing the separation coefficient (β_Er/Al). This work provides novel insights into the behaviors of ions and extractants at oil–water interface and the kinetic separation selectivity under varying concentrations of coexisting salt cations.

了解从复杂背景水溶液中分离特定目标离子的潜在机制对于实现现代工业中可控的化学反应和工业净化过程至关重要。本研究研究了在液-液界面上目标金属离子从复杂水溶液中增强的动力学分离，重点研究了共存盐阳离子的存在。以典型的薄层有机油膜（TOOF）萃取为模型体系，研究了背景Al3+离子对Er3+离子传质和分离的影响。值得注意的是，Al3+离子浓度通过形成独特的氢键相互作用，既影响了Er3+离子在油水界面的分布，也影响了P507萃取剂分子的排列和取向。这些相互作用影响了传质的选择性，促进了Er3+与Al3+离子的分离。具体来说，由于共存的Al3+离子具有较强的水化能力，Er3+离子的水化壳被破坏，导致Er3+离子的界面浓度更高，P507分子的界面取向更有序。当Al3+离子浓度较低时，Er3+离子在界面附近的扩散速率较高，增强了Er3+离子的分离性能。而Al3+离子浓度较高时，Al3+离子的竞争性水化作用增强，Er3+离子的界面浓度因扩散阻力增强而降低，导致分离性能变差。此外，较薄的膜比较厚的膜更有效地富集了界面处的靶Er3+离子，使P507分子的界面取向有序，从而提高了分离系数（βEr/Al）。本研究对离子和萃取剂在油水界面的行为以及不同浓度盐阳离子共存下的动力学分离选择性提供了新的见解。

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引用次数: 0

Modulation of wettability and interfacial reaction between DZ125 superalloy and Al2O3-based ceramic shell: Rare earth oxide doping strategy DZ125高温合金与al2o3基陶瓷壳之间润湿性和界面反应的调控：稀土氧化物掺杂策略

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-03-05 DOI: 10.1016/j.jre.2025.02.025

Baohong Kou , Wentao Zhou , Yujie Lin , Jing Ouyang

To inhibit the interfacial (displacement) reaction between Hf and Al elements in the DZ125 superalloy and the Al₂O₃ and SiO₂ in the Al₂O₃-based ceramic shell, rare-earth oxides (La₂O₃ and Y₂O₃) were used as dopants into the shell. The effects of dopant types and contents (2 wt%, 5 wt% and 8 wt%) on the wettability and interfacial reaction were investigated using the sessile-drop experiment, and the reaction products were analyzed by X-ray diffraction (XRD), a scanning electron microscope (SEM), an electron probe micro-analyzer (EPMA) and X-ray photoelectron spectroscopy (XPS), to clarify the mechanism of dopants in the interfacial reaction. The results show that increasing the Y₂O₃ doping content (2 wt%–8 wt%) reduces the surface porosity from 22.39% to 13.43%, and decreases the surface roughness from 3.25 to 2.28 μm, which enhances the packing density of the shell surface. In the sintering process (1223 K, 2 h), both La₂O₃ and Y₂O₃ dopants react with SiO₂, forming La₂Si₂O₇ and Y₂SiO₅ on the shell surface. During the interfacial reaction process (1823 K, 40 min), La₂Si₂O₇ decomposes and reacts with Al₂O₃ and HfO₂, resulting in the formation of SiO₂·HfO₂·La₂O₃ and Al₂O₃·HfO₂·La₂O₃ ternary composite oxides within the reaction products. At 8 wt% La₂O₃ dopant content, the interfacial reaction is exacerbated, resulting in the uneven wettability. Y₂SiO₅ further reacts with Al₂O₃ and SiO₂ to form SiO₂·Al₂O₃·Y₂O₃ ternary composite oxides, while Y₂O₃ combines with Al₂O₃ to form Al₅Y₃O₁₂ (YAG), which stabilizes the oxides within the shell and inhibits the interfacial reaction, and significantly improves the surface quality of the DZ125 superalloy. As the Y₂O₃ dopant content increases (2 wt%–8 wt%), the wetting angle increases from 97.8° to 110.6°.

为了抑制DZ125高温合金中Hf和Al元素与Al2O3基陶瓷壳中Al2O3和SiO2之间的界面（位移）反应，在壳中加入稀土氧化物（La2O3和Y2O3）作为掺杂剂。采用固滴实验研究了掺杂剂种类和含量（2 wt%、5 wt%和8 wt%）对界面反应润湿性的影响，并通过x射线衍射（XRD）、扫描电镜（SEM）、电子探针微分析仪（EPMA）和x射线光电子能谱（XPS）对反应产物进行了分析，阐明了掺杂剂在界面反应中的作用机理。结果表明：增加Y2O3掺杂量（2 wt% ~ 8 wt%），使表面孔隙率从22.39%降低到13.43%，表面粗糙度从3.25 μm降低到2.28 μm，提高了壳体表面的堆积密度；在烧结过程中（1223 K, 2 h）， La2O3和Y2O3掺杂剂与SiO2发生反应，在壳表面形成La2Si2O7和Y2SiO5。在界面反应过程中（1823 K, 40 min）， La2Si2O7与Al2O3和HfO2分解反应，在反应产物中生成SiO2·HfO2·La2O3和Al2O3·HfO2·La2O3三元复合氧化物。当La2O3掺杂量为8wt %时，界面反应加剧，导致润湿性不均匀。Y2SiO5进一步与Al2O3、SiO2反应形成SiO2·Al2O3·Y2O3三元复合氧化物，而Y2O3与Al2O3结合形成Al5Y3O12 (YAG)，稳定了壳内氧化物，抑制了界面反应，显著改善了DZ125高温合金的表面质量。随着Y2O3掺杂量的增加（2 wt% ~ 8 wt%），润湿角从97.8°增大到110.6°。

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引用次数: 0

Development of high-performance and low-cost BCC type hydrogen storage alloys from FeV80 master alloy refined by cerium 以铈精炼FeV80母合金为原料研制高性能低成本BCC型储氢合金

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-02-26 DOI: 10.1016/j.jre.2025.02.022

Xiaoxuan Zhang , Yang Liu , Huazhou Hu , Songsong Li , Ruizhu Tang , Chenyu Li , Yuehai Li , Luocai Yi , Chuanming Ma , Qingjun Chen

The use of industrial-grade FeV80 master alloy in the synthesis of solid hydrogen storage alloys, rather than pure V, offers substantial economic advantages. However, FeV80 master alloy contains about 5 wt% of Al, Si, O and other impurities, which adversely affect the hydrogen storage performance. In this work, the effective dehydrogenation capacity of Ti₃₁Cr₃₅(FeV80-Ce)₃₄ alloy prepared by Ce pre-refining FeV80 master alloy process reaches 2.42 wt%. By comparing the phase distribution and composition before and after pre-refining, Ce pre-refining significantly reduces the presence of Al and O, inhibits the formation of Ti-rich phase and the generation of SiO₂ in Ti₃₁Cr₃₅(FeV80-Ce)₃₄ alloys. By X-ray photoelectron spectroscopy (XPS) analysis, the metal content of the matrix element increases and the binding energy decreases after Ce pre-refining. The slope factor of pressure-composition-temperature (PCT) curve decreases from 0.60 to 0.48 after Ce pre-refining, which improves the dehydrogenation performance. The dehydrogenation activation energy and enthalpy change of the Ti₃₁Cr₃₅(FeV80-Ce)₃₄ alloy before and after pre-refining are also calculated using kinetics and PCT curves. Furthermore, the Ti₃₁Cr₃₅(FeV80-Ce)₃₄ alloy exhibits a capacity retention of 81% after 200 cycles, surpassing reported values for FeV80-based hydrogen storage alloys. It provides a new idea for developing low-cost and high-capacity FeV80-base hydrogen storage alloys.

在合成固体储氢合金中使用工业级FeV80母合金，而不是纯V，具有实质性的经济优势。然而，FeV80中间合金中含有约5wt %的Al、Si、O等杂质，对储氢性能产生不利影响。本研究采用Ce预精炼FeV80母合金工艺制备的Ti31Cr35(FeV80-Ce)34合金的有效脱氢量达到2.42 wt%。通过对比预精炼前后的相分布和组成可知，Ce预精炼显著降低了Ti31Cr35(FeV80-Ce)34合金中Al和O的存在，抑制了富ti相的形成和SiO2的生成。通过x射线光电子能谱（XPS）分析，Ce预精炼后基体元素的金属含量增加，结合能降低。Ce预精炼后压力-组成-温度曲线斜率因子由0.60降至0.48，提高了脱氢性能。利用动力学和PCT曲线计算了预精炼前后Ti31Cr35(FeV80-Ce)34合金的脱氢活化能和焓变。此外，Ti31Cr35(FeV80-Ce)34合金在200次循环后的容量保持率为81%，超过了fev80基储氢合金的报道值。为开发低成本、高容量的fev80基储氢合金提供了新的思路。

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引用次数: 0

Preparation and spectral properties of blue-to-UVB upconverting Y2O3:RE3+,Gd3+ (RE = Er, Ho) micro-/nano-phosphors 蓝-中波上转换Y2O3:RE3+，Gd3+ (RE = Er, Ho)微/纳米荧光粉的制备及光谱性能

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-03-01 Epub Date: 2025-04-15 DOI: 10.1016/j.jre.2025.04.005

Dechao Yu , Xiaoshan Zhang , Arend Zhang , Xinxin Han , Enhai Song , Dawei Zhang

Phototherapeutic applications gain more and more interests and require fundamental progresses in interdisciplinarity research, particularly a novel topical phototherapy using ultraviolet-B (UVB, ∼310 nm) upconverting phosphors. In this study, three synthesis methods with (out) sintering processes were implemented to obtain micro-/nano-size Y₂O₃:RE³⁺/Gd³⁺ (RE = Er, Ho) particles using RE oxides (RE₂O₃), RE-nitrates (RE (NO₃)₃) and RE-chlorides (RECl₃) as starting materials. Pumped by an OPO laser at wavelengths of 450 and/or 490 nm, blue-to-UVB upconversion with narrowband peak at 313 nm was effectively realized for all the Y₂O₃:RE³⁺/Gd³⁺ powder phosphors. On basis of theoretical speculations and experimental data, a two-photon absorption process was proposed for the UVB upconversion of Y₂O₃:RE³⁺/Gd³⁺. Moreover, the involved energy transfer (ET) from RE³⁺ to Gd³⁺, its back ET mechanisms as well as cross-relaxation between RE³⁺ (RE = Er, Ho) ions were systematically treated versus the Er³⁺- or Ho³⁺-, and Gd³⁺-doping concentration. Note that the UVB upconversion intensity will decline severely as the particles become smaller to submicron and nanoscale, likely due to an increasing surface-to-volume ratio along with more surface defects appearance. All these results would greatly promote the development of novel blue-to-UVB upconverting materials, and their potential applications in topical phototherapy irradiated by blue light source.

光疗应用得到越来越多的关注，需要跨学科研究的基础进展，特别是使用紫外- b （UVB, ~ 310 nm）上转换荧光粉的新型局部光疗。本研究以稀土氧化物（RE2O3）、硝酸稀土（RE (NO3)3）和氯化物稀土（RECl3）为原料，采用（out）烧结法制备了微/纳米级Y2O3:RE3+/Gd3+ (RE = Er, Ho)颗粒。Y2O3:RE3+/Gd3+粉末荧光粉在450nm和/或490nm的激光泵浦下，有效地实现了蓝-中波上转换，其窄带峰值在313nm处。在理论推测和实验数据的基础上，提出了Y2O3:RE3+/Gd3+ UVB上转换的双光子吸收过程。此外，系统地研究了RE3+到Gd3+的能量转移（ET）、后ET机制以及RE3+ (RE = Er, Ho)离子之间的交叉弛豫与Er3+-或Ho3+-和Gd3+-掺杂浓度的关系。请注意，随着颗粒变小到亚微米和纳米级，UVB上转换强度将严重下降，这可能是由于表面体积比的增加以及更多表面缺陷的出现。这些结果将极大地促进新型蓝光-中波上转换材料的开发，以及它们在蓝光照射局部光疗中的潜在应用。

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