Journal of Rare Earths最新文献

{"title":"Tb3+-doped transparent glass composites for high-performance broadband solar-blind deep-ultraviolet photodetectors","authors":"Hong Jia,&nbsp;Xuying Niu,&nbsp;Rui Zhang,&nbsp;Yiwen He,&nbsp;Lujia Xu,&nbsp;Hui Zhou,&nbsp;Xiaoyun Xu,&nbsp;Yantao Yu,&nbsp;Bingbing Fan,&nbsp;Xiaofeng Liu","doi":"10.1016/j.jre.2026.01.034","DOIUrl":"10.1016/j.jre.2026.01.034","url":null,"abstract":"<div><div>Silicate transparent microcrystalline glass is widely used as a matrix for rare-earth ions due to its high thermal stability, high transparency, and stable chemical properties. Simultaneously, Tb³⁺ ions exhibit wide absorption cross section, high luminescence quantum efficiency, and sensitive green light spectral conversion characteristics under strong excitation by solar-blind ultraviolet. Therefore, Na₃YSi₃O₉ silicate glass was used in this study, which contains yttrium (Y) in its crystal phase. It belongs to the same group as terbium (Tb) and provides many crystallization sites for Tb³⁺ ions. Due to their identical valence states and similar ionic radii, Tb³⁺ and Y³⁺ ions are easily interchangeable. Therefore, this structure provides great potential for improving the conversion efficiency, photoluminescence efficiency, and UV conversion efficiency of rare-earth ion Tb³⁺. In addition, by integrating the glass composite with a silicon-based photoconductor, we successfully fabricated a solar-blind UV detector device and demonstrate its practical application for UV detection from 180 to 400 nm. Notably, its operation waveband reaches to the deep-ultraviolet (DUV) region and surpasses the reported candidates. The progress not only suggests the glass composite can be constructed into complex device, but also provide a valuable solution for new-generation DUV detectors.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2852-2859"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of defective cerium-doped ZnIn2S4/CdS type-II heterojunction for boosting CO2 photoreduction","authors":"Shaohong Guo,&nbsp;Ruyue Zheng,&nbsp;Huimin Yu,&nbsp;Jiaqi Yan,&nbsp;Jiayu Li,&nbsp;Haobo Wen,&nbsp;Ziyun Zhou,&nbsp;Jingchun Jia,&nbsp;Ying Chang,&nbsp;Meilin Jia,&nbsp;Changyan Zhu,&nbsp;Heng Jia,&nbsp;Jiang Wang,&nbsp;Zhongmin Su","doi":"10.1016/j.jre.2026.01.010","DOIUrl":"10.1016/j.jre.2026.01.010","url":null,"abstract":"<div><div>Photocatalytic CO₂ reduction into value-added chemicals such as CO is of great importance for carbon-neutral in the future. However, both high CO₂ activation barriers and sluggish charge kinetics make it still a challenge for CO₂ photoreduction with high reactivity. Herein, a type-II heterojunction (CZ/C), which consists of CdS (C) nanospheres anchored on the defective Ce-doped ZnIn₂S₄ (CZ) microflowers, was synthesized by an <em>in-situ</em> solvothermal route, realizing exceptional CO₂ catalytic performance under simulated sunlight irradiation. According to the detailed characterizations and density functional theory calculations, the energy barrier of the rate determining step is significantly reduced due to the outstanding CO₂ adsorption and activation on rare earth Ce atoms. Simultaneously, the separation and transfer efficiency of photogenerated carriers are greatly facilitated by type-II heterojunction constructed by anchoring CdS on CZ and S vacancies resulting from a heteroatom doping strategy. Thus, the optimum photocatalyst of CZ2/C2 composite provides an advantageous platform for CO₂ photoreduction to CO, which is roughly 7.5- and 3.0-fold higher than those of the pristine ZIS and CZ2, respectively. This work offers a promising avenue for designing effective catalysts with a dual-strategy method for photocatalysis.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2880-2891"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147902543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal stability of Ru-based catalysts for soot oxidation: Strong metal-support interactions and reaction scenarios","authors":"Changlong Zheng,&nbsp;Dawei Pang,&nbsp;Baofang Jin,&nbsp;Xiaodong Wu,&nbsp;Jinhao Li,&nbsp;Shuang Liu,&nbsp;Rui Ran,&nbsp;Duan Weng","doi":"10.1016/j.jre.2025.09.030","DOIUrl":"10.1016/j.jre.2025.09.030","url":null,"abstract":"<div><div>Typically, soot oxidation catalysts require high thermal stability to ensure long-term durability. This study investigated the thermal stability of Ru catalysts supported on CeO₂ and Al₂O₃, along with their soot oxidation performance under O₂ and NO atmospheres. The results demonstrate that the fresh Ru/Al₂O₃ catalyst exhibits higher soot oxidation activity than fresh Ru/CeO₂ in both O₂ and NO environments, likely due to the higher oxygen activation and NO oxidation abilities. However, after prolonged thermal aging, Ru/Al₂O₃ suffers from severe sintering of RuO₂ particles, accompanied by partial volatilization of Ru species. This degradation leads to a significant decrease in soot oxidation activity under O₂, as the loss of active sites and reduced redox capability weakens the ability of catalyst to activate oxygen. In contrast, Ru/CeO₂ maintains relatively stable activity in O₂ due to the formation of Ru–O–Ce interfacial bonds, which effectively anchors Ru nanoparticles and suppresses their agglomeration during thermal aging. Interestingly, in the presence of NO, both catalysts show similar degrees of deactivation after thermal aging. This suggests that “NO₂-assisted” soot oxidation mechanism may partially compensate for the loss of active sites, resulting in comparable activity decay trends for Ru/Al₂O₃ and Ru/CeO₂ despite their differing thermal stabilities. These findings highlight the critical role of metal-support interactions in governing the thermal stability of Ru-based soot oxidation catalysts. This investigation provides a theoretical basis for the further design and preparation of highly efficient and stable soot oxidation catalysts.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2922-2928"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NbTi-modified amorphous CeMnOx catalysts for low temperature removal of NO and suppression of N2O formation","authors":"Chengming Zhong,&nbsp;Di Yu,&nbsp;Jia Hou,&nbsp;Chengyang Yin,&nbsp;Ruiyuan Liu,&nbsp;Yan Du,&nbsp;Xuehua Yu,&nbsp;Lanyi Wang,&nbsp;Zhen Zhao","doi":"10.1016/j.jre.2026.08.018","DOIUrl":"10.1016/j.jre.2026.08.018","url":null,"abstract":"<div><div>The abatement of emissions from low-temperature flue gas in non-power industries has emerged as a pressing issue in China, which involves not only the elimination of nitrogen monoxide (NO) but also the prevention of nitrous oxide (N₂O) formation. However, during the denitrification process using ammonia selective catalytic reduction (NH₃-SCR) technology, balancing high NO conversion with low N₂O formation presents a key challenge. Efficiently coupling acidic sites with redox sites has emerged as a promising strategy to address this problem. The selected amorphous CeMn catalyst exhibits high redox capacity. Herein, Nb_<em>x</em>Ti_<em>y</em>-CeMn catalysts were prepared using an excess-impregnation method. Nb and Ti are predominantly dispersed on the catalyst's external surface, and Nb_<em>x</em>Ti_<em>y</em>-CeMn retain an amorphous nature. With an appropriate Nb content, the surface Nb₂O₅ and the segregated Mn₂O₃ function as Brønsted and Lewis acidic sites, respectively. Such efficient surface coupling of acidic and redox sites maintains high NO conversion of the prepared catalysts while markedly suppressing N₂O formation. Nb_<em>x</em>Ti_<em>y</em>-CeMn exhibit excellent low-temperature NH₃-SCR activity, where Nb_10%Ti_15%-CeMn shows <em>T</em>_NO,90% = 120−313 °C and enhanced N₂ selectivity (about 80% at 250 °C). Notably, the acidic, moisture, and sulfur-containing low-temperature flue gas plays a positive role in suppressing N₂O formation. With supplemented acidic and moisture atmosphere, Nb_1%Ti_15%-CeMn achieves desirable low temperature activity (<em>T</em>_NO,90% = 124−407 °C, and N₂ selectivity ≥ 79% at the range of 70−250 °C) than Nb_10%Ti_15%-CeMn. These findings provide valuable insights for designing SCR catalysts with highly redox-active transition metal and rare-earth metal oxides. <em>In situ</em> diffuse reflectance infrared Fourier transform spectroscopy (<em>in situ</em> DRIFTs) results reveal that the introduction of appropriate Brønsted acid sites maintains the coexistence of Eley-Rideal (E-R) and Langmuir–Hinshelwood (L-H) mechanisms, ensuring the low-temperature activity.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2929-2941"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achievement of approximate 1.9 T in coercivity and coercivity enhancement mechanism in Nd,Ce-Fe-B-Ga alloy ribbons","authors":"Xiaofei Wu,&nbsp;Yusong Du,&nbsp;Gang Fu,&nbsp;Jiang Wang,&nbsp;Qingrong Yao,&nbsp;Lei Ma,&nbsp;Gang Cheng,&nbsp;Jingtai Zhao,&nbsp;Deqin Xu,&nbsp;Guanghui Rao","doi":"10.1016/j.jre.2026.01.004","DOIUrl":"10.1016/j.jre.2026.01.004","url":null,"abstract":"<div><div>Enhancing the utilization of abundant rare earth elements to produce Nd-Fe-B based magnets with superior permanent magnetic properties remains a significant research focus in the field of rare earth permanent magnets. In this study, we propose an effective approach to significantly improve the coercivity of Nd,Ce-Fe-B-Ga ribbons. Ribbons with nominal compositions of [(1–<em>x</em>)(Nd_0.5Ce_0.5)_11.76Fe_82.35B_5.88 + <em>x</em>Nd₃₀Fe₆₅Ga₅] (at%; <em>x</em> = 0, 0.1, 0.2, and 0.3) were fabricated via melt-spinning. Hysteresis loops at ±2 T reveal obvious exchange bias phenomena in all samples except for <em>x</em> = 0, which originates from the exchange coupling effect between the ferromagnetic (FM) phase and the antiferromagnetic (AFM) phase. Under an applied field of ±5 T, the coercivity increases progressively from 6.55 kOe (<em>x</em> = 0) to 18.98 kOe (<em>x</em> = 0.3). Specifically, the sample of <em>x</em> = 0.1, where Ce accounts for 38.96 at% of the total rare earth content, achieves a coercivity of 14.46 kOe. The absolute values of the temperature coefficients of remanence (<em>α</em>) and coercivity (<em>β</em>) decrease from 0.420%/K (<em>x</em> = 0) to 0.334%/K (<em>x</em> = 0.2) and from 0.708%/K (<em>x</em> = 0) to 0.439%/K (<em>x</em> = 0.2), respectively. The transmission electron microscopy (TEM) characterization shows that in the Ga-free ribbons (<em>x</em> = 0), grains of the main phase RE₂Fe₁₄B are continuously surrounded by a thin RE-rich grain boundary (GB) phase. With Ga addition (<em>x</em> = 0.3), the continuous RE-rich GB phase disappears and large-sized triple junction phases form, which are composed of the RE-rich phase and the RE₆Fe₁₃Ga phase. Henkel plots further confirm the strong intergranular exchange coupling effect. Therefore, we propose a coercivity enhancement mechanism, namely, the reversal of magnetic domains is pinned through the exchange coupling effect between the AFM phase and the FM phase, thereby enhancing the coercivity of the magnet.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2942-2950"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rare earth-induced structural optimization and enhanced specific capacitance in Pr3+-doped Ni-Zn ferrites for supercapacitor electrodes","authors":"Pallavi Baliram Kadam,&nbsp;Sandip K. Jagadale,&nbsp;Arati Chandragupta Mehere,&nbsp;Mansi Sopan Rathod,&nbsp;Pramod Mhase,&nbsp;Rupesh S. Patil,&nbsp;Vinod N. Dhage,&nbsp;Sopan M. Rathod","doi":"10.1016/j.jre.2025.12.030","DOIUrl":"10.1016/j.jre.2025.12.030","url":null,"abstract":"<div><div>In this study, Pr³⁺-doped Ni_0.5Zn_0.5Fe₂O₄ nanoparticles with formula Ni_0.5Zn_0.5Pr_<em>y</em>Fe_{2–<em>y</em>}O₄ (0 ≤ <em>y</em> ≤ 0.125) were synthesized via the sol–gel auto-combustion method to explore the role of rare-earth substitution in tuning structural and electrochemical properties. X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR) confirm the retention of the cubic spinel phase, while Pr³⁺ incorporation induces lattice distortion, crystallite size reduction, and cation redistribution. The Rietveld refinement analysis was performed to confirm the stable cubic spinel. Most importantly, electrochemical studies established a direct correlation between Pr³⁺ content and capacitance. The specific surface area of Ni_0.5Zn_0.5Pr_<em>y</em>Fe_{2–<em>y</em>}O₄ was determined by using the Brunauer–Emmett–Teller (BET) theory. The optimized composition (<em>y</em> = 0.075) exhibits a maximum specific capacitance of 581.42 F/g at 10 mV/s, with a low charge-transfer resistance, attributed to the combined effects of an enhanced surface area, increased redox-active sites, and improved ion transport pathways. For <em>y</em> = 0.075, a high specific capacitance of 436.8 F/g is achieved at a current density of 2 A/g, as measured by galvanostatic charge–discharge (GCD) analysis. This enhanced electrochemical performance is attributed to the reduced crystallite size and increased surface area, which facilitate efficient charge transfer and improved electrolyte–electrode interaction. The electrochemical impedance spectroscopy (EIS) analysis further confirms the lowest <em>R</em>_ct (1.78 Ω) and <em>R</em>_s (1.78 Ω), indicating faster charge transport and enhanced supercapacitor performance. These findings demonstrate that Pr³⁺ substitution provides an effective strategy for engineering ferrite nanomaterials and underscores the broader potential of rare earth doping in developing high-performance supercapacitor electrodes for next-generation energy storage technologies.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2973-2985"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of molybdenum and tungsten doping/codoping for enhanced upconversion and photocatalysis activity of upconverting BiVO4:Ho3+-Yb3+","authors":"Manoj Hazarika,&nbsp;Lutukurthi D.N.V.V. Konda,&nbsp;Abinash Das,&nbsp;Vineet Kumar Rai","doi":"10.1016/j.jre.2025.12.022","DOIUrl":"10.1016/j.jre.2025.12.022","url":null,"abstract":"<div><div>A series of upconverting BiVO₄:Ho³⁺-Yb³⁺ materials codoped with transition metal Mo⁶⁺ and W⁶⁺ ions were successfully synthesized via hydrothermal method and systematically characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FTIR), Raman and field emission scanning electron microscopy (FESEM) techniques. The optimal doping concentrations of Mo⁶⁺ and W⁶⁺ were identified based on upconversion luminescence (UCL) performance. Notably, Mo⁶⁺ or W⁶⁺ ions codoping significantly improves the UCL intensity, and the Mo⁶⁺-W⁶⁺ codoped sample with the highest enhancement of ∼21-fold compared to BiVO₄:Ho³⁺-Yb³⁺ has been reported. Photocatalytic dye degradation experiments reveal significantly improved activity for the optimized Mo⁶⁺-W⁶⁺ codoped sample, with the highest rate constant (∼0.0578 min⁻¹). This observed rate constant is ∼6 times and ∼10 times better as compared to the BiVO₄:Ho³⁺-Yb³⁺ and pure BiVO₄, respectively. This enhancement is attributed to the increased photogenerated charge carrier density, improved charge transfer ability, and reduced recombination rate. This has been further confirmed by the photoelectrochemical (PEC) studies combined with electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV). The Mo⁶⁺-W⁶⁺ codoped sample exhibits the lowest charge transfer resistance (<em>R</em>_ct = 448.71 Ω), highest photocurrent density (∼7.46 mA/cm²) and longer lifetime as observed from the time-resolved photoluminescence study (TRPL). Additionally, recyclability test confirms the catalyst's stability over multiple cycles, and scavenger studies reveal hydroxyl radicals (·OH) and holes (h⁺) as the dominant reactive species in the degradation process. Overall, the Mo⁶⁺-W⁶⁺ codoped BiVO₄:Ho³⁺-Yb³⁺ has its potential for applications in frequency upconversion and photocatalysis.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2892-2901"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Luminescence modulation of Cs2LiInCl6:Eu perovskites through europium valence state engineering","authors":"Zunshuo Xie,&nbsp;Bingqi Wang,&nbsp;Zhirou Zheng,&nbsp;Jianxiang Yu,&nbsp;Xiuyun Lei,&nbsp;Pan Liu,&nbsp;Alberto J. Fernández-Carrión,&nbsp;Shi Ye,&nbsp;Congling Yin","doi":"10.1016/j.jre.2025.10.004","DOIUrl":"10.1016/j.jre.2025.10.004","url":null,"abstract":"<div><div>Doping engineering in lead-free all-inorganic halide perovskites is important in modulating their performance for emerging photonics applications. Due to their lower symmetry compared to cubic perovskites, hexagonal perovskite Cs₂LiInCl₆ is regarded as an exceptional host material for rare-earth luminescence. Here, we prepared Eu-doped Cs₂LiInCl₆ phosphors with distinct valence states via controlled redox reactions. Magnetism analysis confirms distinct europium valence states in the single-valence samples and reveals the Eu²⁺:Eu³⁺ ratio of 0.02:0.98 in the mixed-valence sample. The Eu²⁺ doping introduces Cl^– vacancies in the host Cs₂LiInCl₆, leading to an abnormal constant volume, while the Eu³⁺ substitution at In³⁺ sites significantly increases the volume. The Cs₂LiInCl₆:Eu²⁺ exhibits dual emission (centered at 436 and 549 nm) arising from 5d→4f transitions of six- and five-coordinated Eu²⁺ centers, leading to overall blue emissions (CIE <em>x</em> = 0.23, <em>y</em> = 0.22), in contrast with red luminescence (CIE <em>x</em> = 0.51, <em>y</em> = 0.47) from the 4f→4f transitions for Eu³⁺ doped analogue. The co-doped system (Eu²⁺/Eu³⁺ ∼0.02) displays a rare purple emission (CIE <em>x</em> = 0.26, <em>y</em> = 0.26) with enhanced thermal luminescent stability. The valence-controlled chromaticity modulation underscores the potential of Eu-doped halide perovskites in developing tunable multicolor light-emitting applications, particularly in LED technologies.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2834-2842"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147900015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gadolinium adsorption in engineered and natural adsorbent systems: A critical analysis of influence of factors, isotherms, kinetics, and thermodynamic implications","authors":"Amirhossein Sadeghi,&nbsp;Hossein Sid Kalal,&nbsp;Sohrab Ali Ghorbanian,&nbsp;Simin Janitabardarzi,&nbsp;Ali Mahvashian","doi":"10.1016/j.jre.2025.11.013","DOIUrl":"10.1016/j.jre.2025.11.013","url":null,"abstract":"<div><div>During the last two to three decades, attention has been drawn to the issues related to the removal and recovery of gadolinium (Gd), as it is now clear that its importance in industry is very high. In this review, various adsorbents such as commercial and synthetic materials, nanoparticles, nanocomposites and the like for the removal and recovery of Gd are collected. The effect of various process factors, such as pH, temperature, contact time, adsorbent dosage, companion ions, adsorption kinetics, as well as adsorption isotherms and adsorption thermodynamics, has been evaluated. Analysis of statistical data shows that 70% of researchers identified the optimal pH values in the range of 5–7 and 60% identified the optimal adsorbent dosage values between 0 and 2 g/L. Also, 80% of the studies evaluated the temperature at 298 K. In most of the studies conducted, the isotherm and kinetics of adsorption show the best agreement with the Langmuir model and the pseudo-second-order model, respectively, although the adsorption process is thermodynamically favorable. At the same time, for evaluating the efficiency of Gd adsorption by adsorbents, the most attention should be paid to the recovery and regeneration of the adsorbents in the desorption process.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 2816-2833"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149071952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of phase structure on high-rate and low-temperature discharge performance of superlattice RE-Mg-Ni alloy","authors":"Xiaoguang Shang,&nbsp;Huiping Yuan,&nbsp;Rui Zhu,&nbsp;Lei Hao,&nbsp;Jing Mi,&nbsp;Yanyan Fu,&nbsp;Yuanfang Wu","doi":"10.1016/j.jre.2025.11.021","DOIUrl":"10.1016/j.jre.2025.11.021","url":null,"abstract":"<div><div>Nickel-metal hydride (Ni-MH) batteries utilizing RE-Mg-Ni-based superlattice alloys as negative electrodes offer high capacity but suffer from limitations in high-rate discharge (HRD) and low-temperature discharge (LTD) performance. This study investigates the role of phase composition and microstructure in optimizing these properties for La_0.575Sm_0.187Y_0.023Mg_0.215Ni_3.580Al_0.120 alloy. X-ray diffraction (XRD), electron probe X-ray micro-analysis (EPMA), and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) results reveal annealing-dependent phase abundance (Pr₅Co₁₉, Ce₅Co₁₉, La₆Ni₂₄) and stacking heterogeneities. When the heat treatment temperature is low (1253 K), the Ce₅Co₁₉ and Pr₅Co₁₉ phases coexist with mixed [A₂B₄]/[AB₅] stacking sequences. As the heat treatment temperature increases (1253–1303 K), the main phase of the alloy transitions from the Ce₅Co₁₉ phase to the Pr₅Co₁₉ phase, and further to the La₆Ni₂₄ phase. Electrochemical testing demonstrates that HRD₁₅₀₀ peaked at 77.5% (1293 K), governed by maximized electrocatalytic activity and hydrogen diffusion rate. Conversely, optimal LTD_{253 K} (78.6%) occurs at 1253 K, attributed to highly abundant Ce₅Co₁₉ phase and lattice defects enhancing surface electrocatalytic activity. Multiphase structures above 1293 K accelerate pulverization, degrading the high-rate and low-temperature discharge performance. This work establishes structure-electrochemical performance relationships critical for designing high-performance RE-Mg-Ni-based alloys.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"44 10","pages":"Pages 3059-3066"},"PeriodicalIF":9.6,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149072110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}