Journal of Rare Earths最新文献_第4页

Electrically controlled valley polarization and anomalous valley Hall effect in GdCl2 bilayer GdCl2双分子层中的电控谷极化和异常谷霍尔效应

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.02.026

Weixin Liu, Yaping Wang, Li Cai, Jianping Zhang, Weixiao Ji, Ping Li, Changwen Zhang, Shengshi Li, Shishen Yan

The recently discovered ferrovalley materials have opened up new opportunities for exploiting novel valleytronic devices capable of storing and processing information. For energy-efficient device applications, achieving electrically controllable valley polarization in ferrovalley materials is of paramount importance. However, most ferrovalley materials inherently lack electrical controllability over valley polarization. Herein, based on first-principles calculations, we demonstrate that the valley polarization of the GdCl₂ bilayer can be effectively manipulated through electrical means with the aid of the layer degree of freedom. The GdCl₂ bilayer exhibits a magnetic ground state that is dependent on the stacking pattern, with ferromagnetic and antiferromagnetic couplings observed in the AA and AB patterns, respectively. Interestingly, the AA bilayer successfully realizes the coexistence of spontaneous ferroelectric polarization and spin-polarized valley polarization. By switching the electric polarization, the layer contribution of valley polarization will be reversed correspondingly, thus enabling different GdCl₂ monolayers to selectively generate the anomalous valley Hall effect (AVHE). Besides, the band splitting can be significantly enhanced by varying the interlayer distance, which makes the generation and manipulation of AVHE more robust. In the AB bilayer without ferroelectricity, the application of a perpendicular electric field can induce spin splitting in energy bands, and flipping the direction of the electric field also allows for flexible control over layer-dependent valley polarization and AVHE. Moreover, two conceptual electrically writable and readable memory devices are proposed based on these two types of stacked GdCl₂ bilayer. This study paves the way for the utilization of ferrovalley bilayer in advancing high-performance valleytronic devices.

最近发现的铁谷材料为开发能够存储和处理信息的新型谷电子器件开辟了新的机会。对于节能器件的应用，实现铁谷材料的可控谷极化是至关重要的。然而，大多数铁谷材料固有地缺乏谷极化的电可控性。在此，基于第一性原理计算，我们证明了可以借助层自由度通过电手段有效地操纵GdCl2双分子层的谷极化。GdCl2双分子层表现出依赖于堆叠模式的磁性基态，在AA和AB模式中分别观察到铁磁和反铁磁耦合。有趣的是，AA双分子层成功地实现了自发铁电极化和自旋极化谷极化的共存。通过开关电极化，谷极化的层贡献将相应反转，从而使不同的GdCl2单层有选择地产生异常谷霍尔效应（AVHE）。此外，改变层间距离可以显著增强带分裂，使AVHE的生成和操作更加鲁棒。在没有铁电性的AB双分子层中，垂直电场的应用可以诱导能带自旋分裂，并且翻转电场的方向也可以灵活地控制层依赖的谷极化和AVHE。此外，基于这两种类型的堆叠GdCl2双层结构，提出了两种概念性的电可写和可读存储器件。该研究为利用铁谷双分子层推进高性能谷电子器件铺平了道路。

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引用次数: 0

Hue-changing luminescence and near-ultraviolet/X-ray dual excitation properties of GdTaO4 multi-doped with Eu3+, Er3+ and Tm3+ Eu3+、Er3+和Tm3+掺杂GdTaO4的变色发光及近紫外/ x射线双激发特性

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.02.016

Seonghun Choi , Sangwon Wi , Nguyen Duc Ton , Hongjoo Kim , Yunsang Lee

In this study, we investigated novel luminescence properties of GdTaO₄, a material with high density and high effective atomic number, doped singly and triply with Eu³⁺, Er³⁺, and Tm³⁺ (GTO:RE, RE = Eu, Er, and Tm). Single-doped samples, GTO:Eu, GTO:Er, and GTO:Tm, exhibit distinct red, green, and blue color emissions with high purity, respectively. For the triple-doped samples, we obtain a high tunability of emission color depending on the excitation wavelength. The emission hue changes in the order of blue-purple-cyan-white-yellow-green-magenta with the increase in the excitation wavelength in the near-ultraviolet (NUV) range. Furthermore, we observe a significant X-ray-excited luminescence for GTO:RE. Our findings suggest that GTO:RE can be a multimodal phosphor providing versatile luminescence properties, such as the colorful emission hue change and dual excitation luminescence under both NUV and X-ray excitations.

在这项研究中，我们研究了一种高密度和高有效原子序数的材料GdTaO4， Eu3+， Er3+和Tm3+ （GTO:RE, RE = Eu, Er，和Tm）的单和三重掺杂。单掺杂样品GTO:Eu、GTO:Er和GTO:Tm分别表现出明显的红色、绿色和蓝色发射，纯度高。对于三掺杂样品，我们获得了发射颜色随激发波长的高可调性。在近紫外（NUV）范围内，随着激发波长的增加，发射色相呈蓝紫色-青色-白色-黄色-绿色-品红的顺序变化。此外，我们还观察到GTO:RE具有明显的x射线激发发光。我们的研究结果表明，GTO:RE可以成为一种多模态荧光体，具有多种发光特性，如在NUV和x射线激发下的彩色发射色调变化和双激发发光。

引用次数: 0

Efficient discoloration of organic dye pollutants from Hanna Lake water, Balochistan, using hybrid 2D AlPO4-5@Ce/Mg-Al LDH nanocatalyst 使用混合2D AlPO4-5@Ce/Mg-Al LDH纳米催化剂对俾路支省汉纳湖水中有机染料污染物的有效脱色

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.02.014

Kanwal Iqbal , Anam Iqbal , Kalsoom Abdul Haq , Saqiba Tahir , Imran Khan , Sara Benabid

The discharge of organic pollutants, particularly dyes, into aquatic environments is a serious environmental risk. The AlPO₄-5@Ce/Mg-Al LDH hybrid catalyst facilitates NaBH₄-mediated reduction by promoting electron transfer from NaBH₄ to the dye molecules, which accelerates the degradation of dyes. The synergistic interaction between the Ce/Mg-Al LDH and AlPO₄-5 components enhances this catalytic efficiency. The catalyst likely enhances the reduction process by creating an environment that activates NaBH₄ more effectively; however, the agglomeration of catalysts, such as 2D zeolites (AlPO₄-5), limits their effectiveness. Agglomeration restricts access to active sites, reducing catalytic efficiency. In this study, the combination of exfoliated Ce-doped layered double hydroxides with AlPO₄-5 prevents agglomeration by ensuring nanoscale mixing, which increases the available surface area and improves contact between the catalyst and the reactants. The versatility of Ce-doped layered double hydroxides (Ce/Mg-Al LDH), along with their function as precursors and substrates, has attracted interest, as they provide metal sources and anchoring sites for catalyst nucleation. This study presents a novel AlPO₄-5@Ce/Mg-Al LDH hybrid catalyst synthesized via solvothermal synthesis and in-situ self-assembly. It is found that the combination of AlPO₄-5 and exfoliated Ce/Mg-Al LDH prevents catalyst agglomeration and ensures nanoscale mixing. AlPO₄-5 is uniformly anchored on the Ce/Mg-Al LDH surface, forming a hybrid nanostructure. Catalytic activity was assessed using the model dye methyl orange (MO), showing superior performance with a rate constant (k_app) of 0.03 s⁻¹. The enhanced activity is attributed to the synergistic interaction between AlPO₄-5 and Ce/Mg-Al LDH, with the latter acting as a co-catalyst. Furthermore, the hybrid catalyst retains its activity after five reuse cycles. This work demonstrates the potential of AlPO₄-5@Ce/Mg-Al LDH as an efficient, reusable nanocatalyst with controlled composition and consistent structure for water pollutant degradation.

有机污染物，特别是染料，排放到水生环境是一个严重的环境风险。AlPO4-5@Ce/Mg-Al LDH杂化催化剂通过促进NaBH4向染料分子的电子转移来促进NaBH4介导的还原，从而加速染料的降解。Ce/Mg-Al LDH和AlPO4-5组分之间的协同作用提高了催化效率。催化剂可能通过创造一个更有效地激活NaBH4的环境来增强还原过程；然而，催化剂的团聚，如二维沸石（AlPO4-5），限制了它们的有效性。团聚限制了活性位点的进入，降低了催化效率。在本研究中，将剥离的掺铈层状双氢氧化物与AlPO4-5结合，通过保证纳米级的混合来防止团聚，从而增加了有效表面积，改善了催化剂与反应物之间的接触。Ce掺杂层状双氢氧化物（Ce/Mg-Al LDH）的多功能性，以及它们作为前体和底物的功能，引起了人们的兴趣，因为它们为催化剂成核提供了金属来源和锚定位点。通过溶剂热合成和原位自组装制备了一种新型AlPO4-5@Ce/Mg-Al LDH杂化催化剂。研究发现，AlPO4-5与剥离Ce/Mg-Al LDH的结合可以防止催化剂团聚，保证纳米级混合。AlPO4-5均匀锚定在Ce/Mg-Al LDH表面，形成杂化纳米结构。用模型染料甲基橙（MO）评价催化活性，反应速率常数（kapp）为0.03 s−1。活性增强是由于AlPO4-5与Ce/Mg-Al LDH之间的协同作用，后者作为助催化剂。此外，混合催化剂在重复使用五次后仍保持其活性。这项工作证明了AlPO4-5@Ce/Mg-Al LDH作为一种高效、可重复使用的纳米催化剂的潜力，该催化剂具有可控的成分和一致的结构，可降解水污染物。

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引用次数: 0

A zero-thermal-quenching green-emitting phosphor Lu3Al5O12: Tb3+, Sc3+ with high quantum efficiency for fingerprinting 零热猝灭绿色发光荧光粉Lu3Al5O12: Tb3+， Sc3+，用于指纹识别

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.03.027

Liangchun Wei , Xiuling Liu , He Tang , Xiaoyun Mi , Meng Zhang , Ting Song , Liping Lu

A series of zero-thermal-quenching green-emitting phosphors Lu_3−xAl_5−yO₁₂: Tb³⁺_x, Sc³⁺_y was developed. Upon the 272 nm excitation, two dominant emission bands centered at 488 and 543 nm are observed, which originate from the ⁵D₄ → ⁷F₆ and ⁵D₄ → ⁷F₅ transitions of Tb³⁺. In the singly Tb³⁺-doped samples, the luminous intensity increases evidently by increasing the Tb³⁺ concentration and reaching the maximum values when x = 0.09. It is proved that concentration quenching occurs mainly through the electric dipole–dipole interaction. The Sc³⁺ ion substitution strategy further enhances the emission intensity of Tb³⁺, and the quantum efficiency reaches 83.83%. The theoretical calculation results show that Sc³⁺ ions prefer to occupying Al³⁺ sites and cause lattice shrinkage, which increases the probability of Tb³⁺ transitions. Impressively, the phosphors exhibit zero-thermal-quenching luminescence at 478 K. Furthermore, the fluorescent latent fingerprint images developed by Lu_2.91Al_4.95O₁₂: Tb³⁺_0.09, Sc³⁺_0.05 phosphors are well visualized. These results suggest that Lu_2.91Al_4.95O₁₂: Tb³⁺_0.09, Sc³⁺_0.05 phosphors have significant potential for the application of latent fingerprints and solar blind UV detection.

研制了一系列零热猝灭绿色发光荧光粉Lu3−xAl5−yO12: Tb3+x， Sc3+y。在272 nm激发下，Tb3+的5D4→7F6和5D4→7F5跃迁形成了以488和543 nm为中心的两个优势发射带。在单掺杂Tb3+的样品中，随着Tb3+浓度的增加，发光强度明显增加，在x = 0.09时达到最大值。证明了浓度猝灭主要是通过电偶极-偶极相互作用发生的。Sc3+离子取代策略进一步增强了Tb3+的发射强度，量子效率达到83.83%。理论计算结果表明，Sc3+离子倾向于占据Al3+的位置，导致晶格收缩，从而增加了Tb3+跃迁的概率。令人印象深刻的是，荧光粉在478 K时表现出零热猝灭发光。此外，Lu2.91Al4.95O12: Tb3+0.09, Sc3+0.05荧光粉制备的荧光潜影指纹图像具有较好的可视化效果。上述结果表明，Lu2.91Al4.95O12: Tb3+0.09, Sc3+0.05荧光粉具有潜在指纹和太阳盲紫外检测的应用潜力。

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引用次数: 0

Cerium oxide cluster modified nickel sulfide/carbon nitride heterostructure for efficient oxygen evolution reaction 氧化铈簇修饰硫化镍/氮化碳异质结构的高效析氧反应

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.03.024

Kexin Sun, Qiang Han, Sicheng Cui, Yuxi Chen, Liqi Wang, Mingzhi Hu, Zexin Li, Qi Zhang, Jihui Lang

Lanthanide rare earth elements (Ln), particularly cerium (Ce) and its compounds, have attracted widespread attention for their role in modulating the local coordination environment of active sites in hosts, thereby the enhanced performance of oxygen evolution reactions (OER). However, there has been limited research on the influence of Ce compounds with the particle size of clusters or smaller on the kinetics performance of hydrolysis of the host. In this work, chemical vapor deposition (CVD) planted NiS_x/C₃N₄ heterostructure nanoarrays, modified surface with the CeO₂ clusters (CeO₂@NiS_x/C₃N₄) is reported and exhibits a superior OER activity. At the current density of 10 mA/cm², the overpotential of the optimized CeO₂@NiS_x/C₃N₄ is as low as 46 mV, and only 247 mV is required to reach a current density of 100 mA/cm², significantly lower than that of NiS_x/C₃N₄ (349 mV). Density functional theory (DFT) calculations confirm that the loaded CeO₂ clusters efficaciously modify the differential charge density distribution of the adjacent active sites and optimized the Gibbs free energy (ΔG) between the active sites and the hydrolysis intermediates, thus enhancing the OER performance of CeO₂@NiS_x/C₃N₄. This work provides a reference for the design and preparation of Ln compounds modified electrodes applied in the field of electrochemical energy conversion and storage and the investigation of the involved mechanisms.

镧系稀土元素（Ln），特别是铈（Ce）及其化合物，因其调节宿主体内活性位点的局部配位环境，从而提高析氧反应（OER）的性能而受到广泛关注。然而，颗粒尺寸为团簇或更小的Ce化合物对宿主水解动力学性能的影响研究有限。在这项工作中，化学气相沉积（CVD）种植了NiSx/C3N4异质结构纳米阵列，表面修饰了CeO2簇（CeO2@NiSx/C3N4），并显示出优异的OER活性。在电流密度为10 mA/cm2时，优化后的CeO2@NiSx/C3N4过电位低至46 mV，只需247 mV即可达到100 mA/cm2的电流密度，明显低于NiSx/C3N4的过电位（349 mV）。密度泛函理论（DFT）计算证实，负载CeO2簇有效地改变了邻近活性位点的电荷密度差分布，优化了活性位点与水解中间体之间的吉布斯自由能（ΔG），从而提高了CeO2@NiSx/C3N4的OER性能。本工作为设计、制备应用于电化学能量转换与存储领域的Ln化合物修饰电极及其机理的研究提供了参考。

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引用次数: 0

Engineering Ni0.5Co0.25Mg0.25Ho0.03Fe1.97O4 ferrite-grafted graphene nanoplatelets (GNPs) composites for rapid degradation of Direct Red 23 dye (DRD-23) Ni0.5Co0.25Mg0.25Ho0.03Fe1.97O4铁氧体接枝石墨烯纳米片（GNPs）复合材料快速降解直接红23染料（DRD-23）

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2024.12.009

Amna Muneer , Muhammad Imran Arshad , Mudasar Nazir , Nasir Amin , Kiran Mehmood , Maria Akhtar , Kashif Javaid , Sadia Ata , Ammara Aslam , Lamia Ben Farhat , Faisal Alresheedi , Zohaib Hassan Nawaz , Muhammad Tariq Sajjad

This study explored the effect of graphene nanoplatelets (GNPs) doping on the magnetic and photocatalytic properties of Ni_0.5Co_0.25Mg_0.25Ho_0.03Fe_1.97O₄ ferrite (NCMHF)/GNPs composites. XRD analysis reveals the presence of single-phase structures and a reduction in crystallite size from 28.06 to 20.17 nm with the incorporation of GNPs. Raman analysis confirms the ferrite spinel structure along with the G and D bands, indicating the successful integration of GNPs in the composites. SEM micrographs show reduced agglomeration with the addition of GNPs. A reciprocal relationship between the lattice parameter (a) and bandgap energy (

E_{g}

) is observed. Among the studied composites, the NCMHF/1.25 wt% GNPs exhibits an

E_{g}

of 2.14 eV and a temperature coefficient of resistance (TCR) of −6.59%/K. This composite also achieves a higher permeability

μ^{'}

and magnetic quality factor (Q) with Q reaching 851 at 5.5 MHz. Meanwhile, the NCMHF/2.25 wt% GNPs composite demonstrate remarkable photodegradation efficiency for Direct Red 23 dye, achieving 88% degradation. The outstanding electromagnetic properties of the NCMHF-GNPs composites make them well-suited for high frequency applications, microwave shielding, high-density data storage, magnetic and bolometric devices. Additionally, their photodegradition performance provides a cost-effective and sustainable solution for water purification.

本研究探讨了石墨烯纳米片（GNPs）掺杂对Ni0.5Co0.25Mg0.25Ho0.03Fe1.97O4铁氧体(NCMHF)/GNPs复合材料磁性和光催化性能的影响。XRD分析表明，在GNPs的掺入下，晶体尺寸从28.06 nm减小到20.17 nm。拉曼分析证实了铁素体尖晶石结构沿G和D带，表明GNPs在复合材料中成功集成。SEM显微图显示，GNPs的加入减少了团聚。在晶格参数(A)和带隙能量（Eg）之间观察到反比关系。在所研究的复合材料中，NCMHF/1.25 wt% GNPs的Eg值为2.14 eV，电阻温度系数（TCR）为- 6.59%/K。该复合材料还具有较高的磁导率μ′和磁品质因子(Q)，在5.5 MHz时Q达到851。同时，NCMHF/2.25 wt% GNPs复合材料对直接红23染料的光降解效率显著，降解率达到88%。NCMHF-GNPs复合材料出色的电磁性能使其非常适合高频应用，微波屏蔽，高密度数据存储，磁性和辐射热测量设备。此外，它们的光降解性能为水净化提供了成本效益和可持续的解决方案。

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引用次数: 0

Cerium and chitosan co-modified ZnO composites for enhancing visible light photocatalytic degradation of Rhodamine B 铈壳聚糖共改性ZnO复合材料对罗丹明B可见光催化降解的影响

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.03.002

Jiangbo Yu , Jing Yu , Dihong Zhang , Kaige Xu , Kaiyin Qiu , Jie Liu , Zhanchao Wu , Haoen Lu , Ruoxin Xuan , Yuhan Xiong , Shaoping Kuang

Incorporating rare-earth element into semiconductors has been regarded as an effective method to improve the photocatalytic activity for degradation of pollutants in water. In this paper, Ce-ZnO/CH (Ce-ZnO/chitosan) composites were prepared by one-step solution for degradation of Rhodamine B (RhB). The photocatalytic performance is improved by 3.5 times through doping Ce to ZnO/CH and the degradation rate of RhB can reach 100 mol% within 40 min. This is attributed to the combined effect of Ce and chitosan on the prepared photocatalytic composite. Firstly, the addition of chitosan enhances the photocatalytic composite's adsorption performance for RhB and effectively prevents the aggregation of ZnO particles. Secondly, the doping of Ce reduces the bandgap energy of ZnO and enhances its response to visible light. Thirdly, the addition of Ce forms electron capture traps, which hinder the recombination of e^–-h⁺ pairs. It is believed that hydroxyl radicals (·OH) and superoxide radicals (·O₂^–) play the main role. Also, this material shows excellent regeneration performance. These results indicates that Ce-ZnO/CH composites have a promising commercial application prospect in dye wastewater treatment.

在半导体中掺入稀土元素被认为是提高光催化降解水中污染物活性的有效方法。采用一步法制备了Ce-ZnO/CH （Ce-ZnO/壳聚糖）复合材料，用于降解罗丹明B （RhB）。Ce掺杂ZnO/CH光催化性能提高了3.5倍，RhB的降解率在40 min内可达到100 mol%。这是由于Ce和壳聚糖对所制备的光催化复合材料的共同作用。首先，壳聚糖的加入增强了光催化复合材料对RhB的吸附性能，有效地阻止了ZnO颗粒的聚集。其次，Ce的掺杂降低了ZnO的带隙能量，增强了ZnO对可见光的响应。第三，Ce的加入形成了电子捕获陷阱，阻碍了e -h+对的重组。认为羟基自由基（·OH）和超氧自由基（·O2 -）起主要作用。同时，该材料具有良好的再生性能。这些结果表明Ce-ZnO/CH复合材料在染料废水处理中具有良好的商业应用前景。

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引用次数: 0

Development of a novel bastnaesite flotation collector: N-hydroxy-3-methoxy-2-naphthalenecarboxamide derived from 2-hydroxy-3-naphthyl hydroxamic acid (H205) 新型氟碳铈矿浮选捕收剂的研制：由2-羟基-3-萘羟肟酸（H205）衍生的n -羟基-3-甲氧基-2-萘甲酰胺

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.02.019

Peng Liu , You Zhou , Mengjie Tian , Wei Sun

Bastnaesite flotation typically uses 2-hydroxy-3-naphthyl-hydroxamic acid (H205) as the primary collector. However, the reactivity of the hydroxyl group bonded to the naphthalene ring in H205 also imparts some collecting ability towards fluorite and dolomite. The design of N-hydroxy-3-methoxy-2-naphthalenecarboxamide (HMNC) replaces this hydroxyl group in H205 with a methoxy group. In the flotation separation of bastnaesite from fluorite and dolomite, HMNC collector outperforms H205 in terms of selectivity. Under identical experimental settings, HMNC achieves higher adsorption amounts on bastnaesite surface compared to fluorite and dolomite, providing HMNC with a superior selectivity. Studies on Ce³⁺ and La³⁺ ions dissolution from bastnaesite surface show that after adding HMNC to bastnaesite slurry, dissolved Ce³⁺ and La³⁺ ions re-adsorb onto bastnaesite surface. This suggests that HMNC primarily does not adsorb onto bastnaesite surface as its anion, but in the form of positively charged Ce-HMNC and La-HMNC complexes. Consequently, the presence of HMNC causes positive shifts in the surface zeta potentials of bastnaesite. After HMNC adsorption on bastnaesite surface, the binding energies of the Ce element undergo significant positive shifts. This suggests that HMNC primarily does not adsorb onto bastnaesite surface by donating electrons to the Ce³⁺ ions to form chemical bonds. First-principles calculations reveal that HMNC encounters difficulty adsorbing onto fluorite surface via its N-hydroxyamide group. Additionally, the steric hindrance of the methyl group in HMNC's methoxy group further reduces its collecting ability in fluorite flotation.

氟碳铈矿浮选通常采用2-羟基-3-萘-羟肟酸（H205）作为主要捕收剂。然而，H205中与萘环相连的羟基的反应性也使其对萤石和白云石具有一定的收集能力。设计了n -羟基-3-甲氧基-2-萘甲酰胺（HMNC），用甲氧基取代H205中的羟基。在氟碳石与萤石、白云石的浮选分离中，HMNC捕收剂的选择性优于H205。在相同的实验条件下，HMNC在氟碳石表面的吸附量高于萤石和白云石，具有优越的选择性。对氟碳铈矿表面Ce3+和La3+离子溶解的研究表明，在氟碳铈矿浆料中加入HMNC后，溶解的Ce3+和La3+离子重新吸附到氟碳铈矿表面。这表明HMNC主要不是以阴离子的形式吸附在氟碳醚表面，而是以带正电的Ce-HMNC和La-HMNC配合物的形式吸附在氟碳醚表面。因此，HMNC的存在导致氟碳醚表面zeta电位的正移动。HMNC在氟碳铈表面吸附后，Ce元素的结合能发生了显著的正偏移。这表明HMNC主要不是通过向Ce3+离子提供电子形成化学键而吸附在氟碳铈矿表面的。第一性原理计算表明，HMNC很难通过其n -羟酰胺基团吸附到萤石表面。此外，HMNC的甲氧基中甲基的位阻进一步降低了其在萤石浮选中的收集能力。

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引用次数: 0

Microstructural modification of Sm2Co17-type magnets by addition of TiO2 powder to enhance mechanical properties 添加TiO2粉末改性sm2co17型磁体的微观结构以提高其力学性能

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.01.012

Lei Wang , Hao Wang , Qiangfeng Li , Chao Wang , Meng Zheng , Yifei Bi , Boxi Zhang , Hang Zhao , Youhao Liu , Yikun Fang , Xiaofei Yi , Wei Li

The mechanical properties of Sm₂Co₁₇ magnets are improved by introducing oxide powders. However, there is a trade-off between the mechanical and magnetic properties. It is important to explore an oxide powder that effectively improves the mechanical properties while avoiding more introduced nonmagnetic elements. TiO₂ is a candidate because it is more reducible than Sm₂O₃ and Ti in it is in +4 valence state. In this work, a small amount (0.08 wt%–0.38 wt%) of fine TiO₂ powers (average powder size is ∼0.2 μm) were introduced into the magnets. The fracture mechanism of TiO₂-added magnets is still brittle cleavage fracture. With TiO₂ addition of 0.08 wt%, the maximum energy product (BH)_max of the magnet is more than 218 kJ/m³, and the coercivity H_cj is larger than 2290 kA/m. More impressively, the maximum flexural strength of the magnets is improved by 37% compared to the original magnet. The introduced TiO₂ is reduced by Sm in the magnet to form Ti and Sm₂O₃ at sintering. Ti is uniformly distributed in the matrix. The newly-formed Sm₂O₃ particles and the ones from the unavoidable oxidation during the preparation process are mainly distributed on the grain boundaries. The particles refine the grains by the Zener pinning effect. Thus, the flexural strength of magnet is improved. Furthermore, with the TiO₂ addition up to 0.38 wt%, the mean grain size decreases by about 36.9%. However, the flexural strength is not further improved significantly. The evolution of the flexural strength is expected to be associated with the larger cellular structure sizes and the increased number of Sm₂O₃ aggregation zones. The results provide a new perspective and inspiration for enhancing the mechanical properties of Sm₂Co₁₇-type magnets.

通过引入氧化物粉末，提高了Sm2Co17磁体的力学性能。然而，在机械性能和磁性之间有一个权衡。探索一种既能有效提高机械性能，又能避免引入更多非磁性元素的氧化物粉末是很重要的。TiO2是一个候选材料，因为它比Sm2O3更容易还原，而且其中的Ti处于+4价态。在这项工作中，将少量（0.08 wt% -0.38 wt%）的细TiO2粉末（平均粉末尺寸为~ 0.2 μm）引入磁体中。添加tio2磁体的断裂机制仍然是脆性解理断裂。TiO2添加量为0.08 wt%时，磁体的最大能积（BH）max大于218 kJ/m3，矫顽力Hcj大于2290 kA/m。更令人印象深刻的是，磁铁的最大弯曲强度比原来的磁铁提高了37%。引入的TiO2在磁体中被Sm还原，烧结形成Ti和Sm2O3。Ti在矩阵中均匀分布。新形成的Sm2O3颗粒和制备过程中不可避免的氧化形成的Sm2O3颗粒主要分布在晶界上。颗粒通过齐纳钉钉效应使颗粒细化。从而提高了磁体的抗弯强度。当TiO2添加量达到0.38 wt%时，平均晶粒尺寸减小约36.9%。然而，抗弯强度没有进一步显著提高。抗折强度的演变与更大的细胞结构尺寸和Sm2O3聚集区数量的增加有关。研究结果为提高sm2co17型磁体的力学性能提供了新的视角和启示。

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引用次数: 0

A novel thermometric performance of Dy3+ doped phosphor: Fluorescence lifetime of grain boundary-doped MgAlON: Dy3+ transparent ceramics 一种新的Dy3+掺杂荧光粉的测温性能：晶界掺杂MgAlON: Dy3+透明陶瓷的荧光寿命

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.02.002

Zhengyang Jing , Bowen Chen , Hao Wang , Pan Gao , Guangsheng Tu , Bingtian Tu , Weimin Wang , Zhengyi Fu

The energy transfer (ET) between f–f transition is achieved by rare earth ions (RE³⁺) doped grain boundaries of transparent ceramics, which enhances the fluorescence thermometry performance and enables multiple fluorescence thermometry modes of transparent ceramics. In this work, MgAlON:Dy³⁺ transparent ceramics were prepared and segregation of Dy³⁺ in grain boundaries was realized. With excellent absolute and relative sensitivities (2.447 μs/K and 2.09%/K), the fluorescence lifetime (FL) signals of MgAlON:Dy³⁺ exceeds most of RE³⁺ doped phosphors. The ET between closely segregated Dy³⁺ in grain boundaries modifies the distribution of electron on ⁴I_15/2 level, and induces temperature-dependent FL to the phosphors. This work reveals the influence of grain boundary segregation on ET between Dy³⁺ for improving the fluorescence thermometry performance of phosphors.

稀土离子（RE3+）掺杂透明陶瓷晶界实现了f-f跃迁之间的能量转移（ET），增强了透明陶瓷的荧光测温性能，实现了透明陶瓷的多种荧光测温模式。本文制备了MgAlON:Dy3+透明陶瓷，实现了Dy3+在晶界的偏析。MgAlON:Dy3+的绝对灵敏度和相对灵敏度分别为2.447 μs/K和2.09%/K，其荧光寿命（FL）信号超过了大多数RE3+掺杂的荧光粉。晶界上紧密分离的Dy3+之间的ET改变了4I15/2能级上的电子分布，诱导了荧光粉的温度依赖性FL。本工作揭示了晶界偏析对Dy3+间ET的影响，以改善荧光粉的荧光测温性能。

引用次数: 0