Journal of Rare Earths最新文献_第7页

Influence of scandium and yttrium on mechanical properties, corrosion behavior, and martensitic transformation of near-β titanium alloys 钪和钇对近β钛合金力学性能、腐蚀行为和马氏体相变的影响

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.03.003

Yueyan Tian , Renhao Xue , Bing Xie , Kaige Wang , Guangcheng Xiao , Zhe Yuan , Xiaoning Xu , Ligang Zhang , Libin Liu

The low-modulus medical near-β titanium alloy, Ti-26Nb-4Zr-4Sn-1Mo-1Ta, can achieve an exceptionally low elastic modulus (36.6 GPa) through cold rolling, which showed promise as a next-generation material for orthopedic implants. However, subsequent testing revealed that the corrosion resistance of this alloy matrix is inferior to that of conventional commercial titanium alloys (Ti-6Al-4V and pure Ti), which significantly limits its long-term stability in the human body. Therefore, improving its corrosion resistance has become a critical issue that must be addressed. In this study, we investigated the effects of rare earth elements scandium (Sc) and yttrium (Y) on the mechanical and corrosion properties of the Ti-26Nb-4Zr-4Sn-1Mo-1Ta alloy. The addition of scandium refines the grain size, suppresses the martensitic transformation, lowers the elastic modulus, enhances corrosion resistance, and induces superior superelastic behavior in the matrix. In contrast, yttrium increases strength and corrosion resistance but has no significant effect on the martensitic transformation, resulting in an increased elastic modulus. These findings indicate that scandium is an effective alloying element for achieving low modulus, high strength, and exceptional corrosion resistance. This study provides new insights for achieving even lower elastic modulus and improved corrosion resistance in future low-modulus biomedical alloys.

低模量医用近β钛合金Ti-26Nb-4Zr-4Sn-1Mo-1Ta通过冷轧可以获得极低的弹性模量（36.6 GPa），有望成为下一代骨科植入材料。然而，随后的测试表明，该合金基体的耐腐蚀性不如传统的商用钛合金（Ti- 6al - 4v和纯Ti），这大大限制了其在人体中的长期稳定性。因此，提高其耐腐蚀性已成为必须解决的关键问题。在本研究中，我们研究了稀土元素钪（Sc）和钇(Y)对Ti-26Nb-4Zr-4Sn-1Mo-1Ta合金力学性能和腐蚀性能的影响。钪的加入细化了晶粒尺寸，抑制了马氏体相变，降低了弹性模量，提高了抗腐蚀性能，并在基体中诱发了优异的超弹性行为。相反，钇增加了强度和耐蚀性，但对马氏体相变没有显著影响，导致弹性模量增加。这些发现表明，钪是一种有效的合金元素，可以实现低模量、高强度和优异的耐腐蚀性。该研究为实现未来低模量生物医学合金的更低弹性模量和更好的耐腐蚀性提供了新的见解。

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引用次数: 0

Experimental and first principles study on opto-structural property of hydrothermally synthesized Cu1‒xNdxO NPs with enhanced photocatalytic activity 水热合成具有增强光催化活性的Cu1-xNdxO NPs光结构性质的实验和第一性原理研究

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.04.009

Hridoy Saha , Md Jannatul Ferdous Anik , Sovendo Talapatra , Ahammad Ullah , Ankita Dastider , Sadia Rafiq , Md Muktadir Billah , Saquib Ahmed

Metal oxide (MO) semiconductor material, CuO having band gap energy of 1–2.6 eV is crucial for various micro-electronic devices and catalytic applications including photocatalysis. However, their structure controlled multifunctional properties are very much limited in their pristine form which often lowers their competency as a photocatalyst. Rare earth doping is a promising method to impart unique quality to MOs in nanoscale. Such dopant can alter crystal structure, morphology, and subsequently its distinct properties leading to significantly improved photocatalytic performance. Herein, p-type pristine and Nd³⁺ (0.5 mol%, 1 mol%, 2 mol%, 3 mol%) doped monoclinic CuO nanoparticles (NPs) were synthesized using hydrothermal route. Comprehensive characterization of the structural, morphological, optical, and functional group properties was performed using advanced characterization techniques. It is found that crystallite size and band gap are reduced. The NP with up to 2 mol% Nd doping substantially enhances the photocatalytic degradation of Rhodamine B (Rh B) dye compared to its pristine form. The 2 mol% Nd-doped CuO NPs exhibit maximum photodegradation efficiency of 84%, maintaining 80% activity after four successive cycles. Scavenger tests indicate that ·OH radicals are the primary species responsible for the degradation mechanism. In addition, theoretical investigation using density functional theory (DFT) corroborates the experimental band gap measurements which attest the prospects of rare earth element (Nd) doped CuO as a photocatalyst.

金属氧化物（MO）半导体材料，CuO具有1-2.6 eV的带隙能量，对于各种微电子器件和催化应用（包括光催化）至关重要。然而，它们的结构控制的多功能性质在其原始形式中受到很大限制，这往往降低了它们作为光催化剂的能力。稀土掺杂是在纳米尺度上赋予MOs独特品质的一种很有前途的方法。这种掺杂剂可以改变晶体结构、形态，从而改变其独特的性质，从而显著提高光催化性能。本文采用水热法合成了p型原始和Nd3+ (0.5 mol%, 1 mol%, 2 mol%, 3 mol%)掺杂的单斜CuO纳米粒子（NPs）。利用先进的表征技术对其结构、形态、光学和官能团性质进行了全面表征。发现晶体尺寸和带隙减小。与原始形式相比，Nd掺杂高达2 mol%的NP大大增强了罗丹明B （Rh B）染料的光催化降解。2 mol% nd掺杂的CuO NPs的最大光降解效率为84%，连续4次循环后仍保持80%的活性。清除试验表明，·OH自由基是主要的降解机制。此外，利用密度泛函理论（DFT）进行的理论研究证实了实验带隙测量结果，证明了稀土元素（Nd）掺杂CuO作为光催化剂的前景。

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引用次数: 0

Near-infrared mechanoluminescence from Sr3Sn2O7:Nd3+ for potential bioimaging and non-destructive detection Sr3Sn2O7:Nd3+的近红外机械发光技术用于潜在的生物成像和无损检测

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2026-01-01 DOI: 10.1016/j.jre.2025.01.008

Yafen Wu , Sheng Wu , Puxian Xiong , Shouping Wang

Mechanoluminescence (ML) materials have made significant progress in flexible sensing and human–computer interaction due to their unique “force-to-light” conversion properties. However, most ML materials are limited to the visible light spectral band and single triggering mechanisms, limiting their practical applications in bioimaging and medical non-destructive detection. Here, a near-infrared (NIR) ML material Sr₃Sn₂O₇:0.01Nd³⁺ with multi-mode physical stimuli response is reported. Under friction and compression mechanical stimuli, the ML intensity of Sr₃Sn₂O₇:0.01Nd³⁺ is linearly positively correlated with the applied load, showing excellent stress-sensing performance. At the same time, the Sr₃Sn₂O₇:0.01Nd³⁺ ML material can penetrate different biological tissues up to 10 mm thick and realize the non-destructive detection of components in various transparent liquids. In addition, non-invasive blood lipid detection can be potentially obtained for patients through the absorption characteristics of oils and fats for NIR light signals. These research results indicate the broad application prospects of Sr₃Sn₂O₇:0.01Nd³⁺ in bioimaging, health monitoring, and non-destructive detection, and it provides a basis for developing new medical non-invasive detection technologies.

机械发光材料由于其独特的“力-光”转换特性，在柔性传感和人机交互方面取得了重大进展。然而，大多数ML材料仅限于可见光光谱带和单一触发机制，限制了它们在生物成像和医学无损检测中的实际应用。本文报道了一种具有多模物理刺激响应的近红外（NIR） ML材料Sr3Sn2O7:0.01Nd3+。在摩擦和压缩机械刺激下，Sr3Sn2O7:0.01Nd3+的ML强度与外加载荷呈线性正相关，表现出优异的应力敏感性能。同时，Sr3Sn2O7:0.01Nd3+ ML材料可穿透厚度达10 mm的不同生物组织，实现各种透明液体中组分的无损检测。此外，通过油脂对近红外光信号的吸收特性，有可能为患者实现无创血脂检测。这些研究结果表明Sr3Sn2O7:0.01Nd3+在生物成像、健康监测、无损检测等方面具有广阔的应用前景，为开发新的医疗无创检测技术提供了基础。

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引用次数: 0

Review on progress of rare earth science and technology in 2024 2024年稀土科技进展述评

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2025-08-06 DOI: 10.1016/j.jre.2025.08.003

Chun-Hua Yan , Xiaowei Huang

This article briefly reviews the major research progress of 9 typical material fields, including rare earth luminescence materials, catalysis, rare earth materials for biomedical applications, magnetic materials, optical crystals, molecular-based materials, energy materials, metals and alloys, as well as rare earth extraction, separation and recycling in the year 2024. The aim of the review is to summarize the past and look into the future, and it will provide a basic overview of domestic work in related fields last year. Due to the abundance of content, the review strives to be concise.

本文简要综述了2024年稀土发光材料、催化、生物医学稀土材料、磁性材料、光学晶体、分子基材料、能源材料、金属及合金、稀土提取、分离与回收等9个典型材料领域的主要研究进展。回顾的目的是总结过去，展望未来，并对去年国内相关领域的工作进行基本概述。由于内容丰富，评论力求简洁。

引用次数: 0

Crystal structure, magnetic properties and cryogenic magnetocaloric performance of garnet RE3Al5O12 (RE = Tb, Dy and Ho) compounds 石榴石RE3Al5O12 （RE = Tb， Dy和Ho）化合物的晶体结构、磁性能和低温磁热性能

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2025-07-08 DOI: 10.1016/j.jre.2025.07.013

Zhenqian Zhang, Guangyi Sun, Xinyue Ye, Lingwei Li

The magnetic refrigeration (MR) based on the principle of magnetocaloric effect (MCE) in magnetic materials was recognized as an alternative cooling way to our present commercialized vapor compression cycle technology. Evidently, a vital prerequisite for practical applications is the exploration of candidate materials with prominent magnetocaloric performances. In this paper, the polycrystalline garnet RE₃Al₅O₁₂ (RE = Tb, Dy and Ho) compounds with the cubic structure (space group:

I a \bar{3} d

) were prepared using the Pechini sol–gel method, and their crystal structure, magnetic properties and comprehensive magnetocaloric performances were studied. The analysis of magnetic susceptibility curves in a static magnetic field H = 0.1 T reveal that the Dy₃Al₅O₁₂ undergoes antiferromagnetic transition with Néel temperature T_N ≈ 2.6 K, whereas the Tb₃Al₅O₁₂ and Ho₃Al₅O₁₂ exhibit no features indicative of the magnetic ordering processes down to 1.8 K. The comprehensive magnetocaloric performances, namely the maximum magnetic entropy change and relative cooling power, are derived indirectly from the isothermal field-dependent magnetization data, which yield 11.72, 10.42, 7.53 J/(kg·K) and 84.56, 69.52, 70.35 J/kg for the Tb₃Al₅O₁₂, Dy₃Al₅O₁₂ and Ho₃Al₅O₁₂ under a low field change (ΔH) of 0–2 T, respectively. The superior comprehensive magnetocaloric performances and wide operating temperature range of these compounds under low ΔH make them attractive for cryogenic MR technology.

基于磁性材料的磁热效应（MCE）原理的磁制冷（MR）被认为是替代目前商业化蒸汽压缩循环技术的一种制冷方式。显然，实际应用的一个重要先决条件是探索具有突出磁热性能的候选材料。采用Pechini溶胶-凝胶法制备了具有立方结构（空间群：Ia3¯d）的多晶石榴石RE3Al5O12 （RE = Tb， Dy和Ho）化合物，并对其晶体结构、磁性能和综合磁热性能进行了研究。在静磁场H = 0.1 T下的磁化率曲线分析表明，Dy3Al5O12在n温度TN≈2.6 K时发生反铁磁跃迁，而Tb3Al5O12和Ho3Al5O12在1.8 K以下没有表现出磁性有序过程的特征。根据等温场相关磁化数据间接得出了Tb3Al5O12、Dy3Al5O12和Ho3Al5O12在0-2 T低场变化（ΔH）下的综合磁热性能，即最大磁熵变化和相对冷却功率分别为11.72、10.42、7.53 J/（kg·K）和84.56、69.52、70.35 J/kg。这些化合物在低ΔH下优越的综合磁热性能和宽的工作温度范围使它们成为低温MR技术的吸引力。

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引用次数: 0

Improvement of forming quality, microstructure, and bio-tribological properties of additive manufactured Ti6Al4V with LaB6 addition 添加LaB6对Ti6Al4V成形质量、微观结构和生物摩擦学性能的改善

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2025-07-03 DOI: 10.1016/j.jre.2025.07.006

Dingding Xiang , Xiaoxin Leng , Liang Yan , Yutang Wang , Di Wang , Shu Wang , Zibin Chen , Xiaoshu Zhou

The poor wear resistance limits the applications of Ti6Al4V alloy. The additive manufactured Ti6Al4V alloy, particularly produced in the air, has issues with the poor forming quality. In this study, a rare earth compound (LaB₆) was introduced to enhance both the forming quality and bio-tribological properties of Ti6Al4V alloy. The results show that adding an appropriate amount of LaB₆ can reduce defects (pores). The microstructure is obviously refined due to pinning and heterogeneous nucleation effects, and the La₂O₃ and TiB are formed through the in-situ reactions. The sample with 4 wt% LaB₆ addition exhibits excellent microhardness and bio-tribological properties. Grain refinement, dispersion strengthening and solution strengthening can significantly improve the microhardness, and the bio-tribological properties are further improved when combined with the in-situ network-structured hard TiB whisker (TiBw). This work is expected to provide reference suggestions for the development of additive manufactured titanium alloys and its application in implants.

较差的耐磨性限制了Ti6Al4V合金的应用。添加剂制造的Ti6Al4V合金，特别是在空气中生产，存在成形质量差的问题。为了提高Ti6Al4V合金的成形质量和生物摩擦学性能，本研究引入了稀土化合物LaB6。结果表明，加入适量的LaB6可以减少缺陷（孔隙）。由于钉钉和非均相成核作用，微观结构明显细化，La2O3和TiB是通过原位反应形成的。添加4 wt% LaB6的样品具有优异的显微硬度和生物摩擦学性能。晶粒细化、弥散强化和固溶强化可显著提高显微硬度，与原位网状硬TiB晶须（TiBw）结合可进一步提高生物摩擦学性能。本研究有望为增材钛合金的发展及其在植入体中的应用提供参考意见。

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引用次数: 0

Effect of trivalent rare earth metal doping on structural, optical, electrical and electrochemical properties of cerium oxide ceramics 三价稀土金属掺杂对氧化铈陶瓷结构、光学、电学和电化学性能的影响

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2025-06-28 DOI: 10.1016/j.jre.2025.06.017

Subhadip Das, Rupesh Mondal, Kumar Sanket, Sudhin Sukumaran, Arun Chowdhury, Shantanu K. Behera, Swadesh Kumar Pratihar

Cerium oxide is an earth-abundant, highly researched multifunctional oxide with great technological importance and wide applications area. Trivalent rare earth (RE³⁺) dopants modify the defects concentration, create plenty of Ce³⁺⇄Ce⁴⁺ redox centres and generate numerous oxygen vacancies than the pure ceria. In the present work, CeO₂ (CE), 10 mol% Gd doped ceria (Ce_0.9Gd_0.1O_2–ẟ; CGO), and 10 mol% Sm doped ceria (Ce_0.9Sm_0.1O_2–ẟ; CSO) were synthesized by sol–gel auto-combustion method. The phase formation, particle morphology, and elemental distribution of the synthesized powder samples were studied by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and energy dispersive X-ray analysis. UV-diffuse reflectance spectroscopy was used to study the optical properties of the material. The band gaps of the CE, CSO and CGO were calculated to be 2.81, 2.71 and 2.60 eV, respectively. Electrochemical impedance spectroscopy (EIS) at room temperature (RT) investigated the materials' electrical properties. The improved electrical conductivity was registered for the doped variants. CGO reaches the highest one (0.4 × 10⁻⁷ S/cm) at RT. Cyclic voltammetry (CV) was performed to study the oxidation-reduction behavior and reversibility of the ion intercalation–deintercalation process of the materials in an electrolyte solution. For the doped ceria, a threefold improved current density is observed for the cathodic part, while a small improvement is reflected in the anodic part. Specific capacitance (C_sp) was calculated at the Faradaic and non-Faradaic region of the voltammograms. C_sp of the materials increases in the order of CE << CSO < CGO. The highest C_sp 345.16 F/g at a scan rate of 5 mV/s is obtained for the CGO. Lastly, a correlation is drawn by analysing cyclic voltammograms to conclude the applicability of the doped ceria material for room-temperature water-electrolysis in the alkaline medium.

氧化铈是一种储量丰富、研究较多的多功能氧化物，具有重要的技术意义和广泛的应用领域。三价稀土（RE3+）掺杂物改变了缺陷浓度，创造了大量的Ce3+氧化还原中心，并产生了比纯铈更多的氧空位。本文采用溶胶-凝胶自燃烧法合成了CeO2 （CE）、10 mol% Gd掺杂的ceria （Ce0.9Gd0.1O2 -ẟ； CGO）和10 mol% Sm掺杂的ceria （Ce0.9Sm0.1O2 -ẟ； CSO）。采用x射线衍射、傅里叶变换红外光谱、场发射扫描电镜和能量色散x射线分析研究了合成粉末样品的相形成、颗粒形态和元素分布。利用紫外漫反射光谱法研究了材料的光学性质。计算得到CE、CSO和CGO的带隙分别为2.81、2.71和2.60 eV。室温下电化学阻抗谱（EIS）研究了材料的电学性质。对掺杂变体的电导率进行了改进。CGO在室温下达到最高值（0.4 × 10−7 S/cm）。利用循环伏安法（CV）研究了材料在电解质溶液中的氧化还原行为和离子插入-脱插过程的可逆性。对于掺杂后的铈，阴极部分电流密度提高了三倍，而阳极部分电流密度略有提高。在伏安图的法拉第区和非法拉第区计算比电容（Csp）。材料的Csp大小依次为CE <；< CSO <； CGO。在扫描速率为5 mV/s时，CGO的Csp值最高为345.16 F/g。最后，通过循环伏安分析得出了两者之间的相关性，从而得出了掺杂铈材料在碱性介质中室温水电解的适用性。

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引用次数: 0

Ligand rigidity-mediated coordination symmetry engineering in lanthanide-titanium nanoclusters achieves >90% photoluminescence quantum yield 配体刚性介导的配位对称工程在镧钛纳米团簇中实现了90%的光致发光量子产率

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2025-06-10 DOI: 10.1016/j.jre.2025.06.001

Xinran Yan , Ming Zhao , Feng Jiang , Haifeng Zhu , Weinan Dong , Shengrong He , Jingjing Xia , Meixin Hong , Zhennan Wu , Xue Bai

Achieving high-efficiency photoluminescence in trivalent lanthanides (Ln³⁺) requires precise crystal-field perturbation to overcome parity-forbidden 4f-transitions and suppress nonradiative decay. However, realizing such control remains challenging, even in well-optimized Ln³⁺-doped nanocrystals. Here, by exploiting the atomically precise structure of metal nanoclusters, we demonstrate symmetry engineering in the Eu₂Ti₄ nanoclusters through stepwise ligand substitution (BA/Phen → FBA/Phen→ FBA/Bpy. BA: benzoicacid; Phen: 1,10-phenanthroline; FBA: p-fluorobenzoicacid; Bpy: 2,2′-bipyridine). The incorporation of FBA effectively suppresses nonradiative relaxation, while the flexible Bpy ligand induces symmetry reduction from D_2d to C_2v through coordination modulation, yielding a high photoluminescence quantum yield (PLQY) of 91.2% in the Ln³⁺ cluster systems. The transient-absorption, Judd-Ofelt theory, crystal-field analysis, and temperature-dependent photophysical studies elucidated the underlying modulation mechanisms. Furthermore, these clusters exhibit promising potential for optoelectronic applications, offering a new design strategy for high-performance luminescent materials.

在三价镧系元素（Ln3+）中实现高效光致发光需要精确的晶体场扰动来克服奇偶禁止的4f跃迁和抑制非辐射衰变。然而，即使在优化的Ln3+掺杂纳米晶体中，实现这种控制仍然具有挑战性。本文利用金属纳米团簇的原子精确结构，通过逐步取代配体（BA/Phen→FBA/Phen→FBA/Bpy），证明了Eu2Ti4纳米团簇的对称性工程。英航:benzoicacid;苯酚的:1、10-phenanthroline;FBA: p-fluorobenzoicacid;Bpy: 2, 2’关于环)。FBA的加入有效地抑制了非辐射弛豫，而灵活的Bpy配体通过配位调制诱导从D2d到C2v的对称性还原，在Ln3+簇体系中产生了91.2%的高光致发光量子产率（PLQY）。瞬态吸收、Judd-Ofelt理论、晶体场分析和温度依赖性光物理研究阐明了潜在的调制机制。此外，这些团簇在光电应用方面表现出良好的潜力，为高性能发光材料的设计提供了新的策略。

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引用次数: 0

First-principles analysis of effects of cerium doping on electrochemical corrosion behaviors of steel 铈掺杂对钢电化学腐蚀行为影响的第一性原理分析

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2025-05-01 DOI: 10.1016/j.jre.2025.04.027

Xiangjun Liu , Zhongqiao Ma , Changqiao Yang , Xiang Li , Jichun Yang , Huiping Ren , Hui Ma

Based on first-principles calculation framework, the surface model, anodic dissolution, cathodic oxygen absorption reaction, and other related electrochemical corrosion models of Fe-Ce system were constructed, and the influencing mechanism Ce doping on the corrosion resistance of Fe-Ce system in the Cl medium environment was analyzed. The results show that Ce doping on the first surface and subsurface inhibits the ionization of Fe atoms and greatly promotes the repassivation process of Fe matrix. Ce doping on the first layer is conducive to preventing the detachment of surface Fe atoms from Fe matrix and delaying the occurrence of corrosion. Ce atoms in the subsurface effectively increase the difficulty of Fe atoms detaching from the matrix at high Cl concentrations. When O diffusion is the controlling link of oxygen absorption reaction, Ce doping has no effects on the reaction rate of cathodic oxygen absorption. Ce doping enhances the electrochemical stability of Fe(100)₁ and reduces the anodic dissolution rate of Fe matrix, thereby improving its corrosion resistance.

基于第一性原理计算框架，构建了Fe-Ce体系的表面模型、阳极溶解反应、阴极吸氧反应等相关电化学腐蚀模型，分析了Ce掺杂对Fe-Ce体系在Cl介质环境下耐蚀性的影响机理。结果表明，Ce在第一表面和亚表面的掺杂抑制了Fe原子的电离，极大地促进了Fe基体的再钝化过程。在第一层掺杂Ce有利于防止表面铁原子脱离铁基体，延缓腐蚀的发生。在高Cl浓度下，亚表面的Ce原子有效地增加了Fe原子与基体分离的难度。当O扩散为吸氧反应的控制环节时，Ce掺杂对阴极吸氧反应速率没有影响。Ce掺杂增强了Fe(100)1的电化学稳定性，降低了Fe基体的阳极溶解速率，从而提高了其耐蚀性。

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引用次数: 0

Evaluating citric acid as a selective leaching agent to extract Nd2Fe14B matrix phase from end-of-life magnets 评价柠檬酸作为选择性浸出剂从报废磁体中提取Nd2Fe14B基质相的效果

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths

Pub Date : 2025-04-29 DOI: 10.1016/j.jre.2025.04.020

L. Schieren , S. Semsari Parapari , T. Tomše , K. Žužek , S. Šturm , S. Kobe , C. Burkhardt

A single-phase Nd₂Fe₁₄B powder was prepared from end-of-life (EOL) wind turbine magnets by a combination of hydrogen processing of magnetic scrap (HPMS) and selective leaching with citric acid. The impact of leaching time on chemical composition, particle size and magnetic properties was investigated. Due to the low reduction potential of rare earth element (REE), the Nd-rich phase was preferentially leached. The use of an acid concentration of 0.5 mol/L, a solid to liquid ratio of 1/10 and a leaching time of 30 min was sufficient to leach the Nd-rich phase. Atomic resolution transmission electron microscopy was employed to examine the surface structure and chemistry of the leached Nd₂Fe₁₄B powder. It is revealed that the leaching process affects not only the Nd-rich phase but also the matrix grains, resulting in the formation of a predominant oxygen-rich amorphous reaction layer, 25 nm thick. However, the oxygen content is reduced from 3500 to 2500 ppm and the magnetic saturation is increased by 8%. This method is a promising addition to the HPMS process, as the powder can be mixed with fresh, unoxidized grain boundary phase to produce recycled magnets with high remanence.

以报废风力发电磁体为原料，采用磁屑氢处理和柠檬酸选择性浸出相结合的方法制备了单相Nd2Fe14B粉末。研究了浸出时间对其化学组成、粒度和磁性能的影响。由于稀土元素的低还原电位，富nd相被优先浸出。酸浓度为0.5 mol/L，料液比为1/10，浸出时间为30 min即可浸出富nd相。采用原子分辨透射电镜对浸出的Nd2Fe14B粉末的表面结构和化学性质进行了研究。结果表明，浸出过程不仅影响富nd相，而且影响基体晶粒，形成了厚25 nm的富氧非晶态反应层。然而，氧含量从3500 ppm降低到2500 ppm，磁饱和度增加了8%。该方法是HPMS工艺的一个有前途的补充，因为粉末可以与新鲜的，未氧化的晶界相混合，以产生高剩余率的回收磁体。

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引用次数: 0