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Increasing heat resistance of a Mg-Sm-Zn alloy via minor gadolinium addition

Journal of rare earths 2025年第3期43卷 612-619,I0007页

作者： Deping Zhang Wenxin Hu Liren Cheng Boqiong Li Chenbin Zhang Department of Materials Science and Engineering Jinzhong UniversityJinzhong030600China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization BaotouO14030China State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022 China

The addition of minor gadolinium(Gd)into Mg-4Sm-0.6Zn-0.4Zr alloy significantly enhances hightemperature strength and creep resistance,such as a decrease in the minimum creep rate by approximately five times and an increase in the yield strength by around 40 MPa at 200℃.The presence of Gd results in the co-precipitation of both prismaticβ-type and basal y-type phases during creep,whereas only the basalγ-type phase is present in the Gd-free *** prismaticβ-type and basalγ-type phases are oriented perpendicular to each other in space,creating a closed configuration that effectively blocks dislocation motions compared to single basalγ-type ***,the improved creep resistance in the Gd-enriched alloy is mainly attributed to the co-precipitation of prismaticβ-type andγ-type precipitates during ***,rare earth(RE)atoms inherently provide stable solute hardening at high temperatures,which contributes to the increased high-temperature *** addition of Gd also enhances grain boundary stability by promoting the formation of more Mg_(3)RE phases,thereby further enhancing the creep *** findings offer insights into the development of highly creepresistant Mg alloys with low RE concentrations.

关键词： rare earths Magnesium alloys Creep resistance Dynamic precipitation

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Amino acid assisted aqueous synthesis of highly stable CsPbBr_(3)nanocrystals for cell imaging

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Nano Research 2025年第1期18卷 675-683页

作者： Xue Li Yanan Guo Guoying Tan Qingyi Liu Nan Song Yu Tang State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

Lead halide perovskite nanocrystals(NCs)exhibit excellent optoelectronic performance and have drawn great interests in the fields of biological imaging and ***,the poor stability of CsPbX_(3)(X=Cl,Br,I)in water is still a challenge to hinder their practical *** this work,a facile strategy has been developed for aqueous synthesis of CsPbX_(3) nanocrystals,in which L-glutamic acid(LGlu)has been used to replace oleic acid in the synthetic *** from the synergic effects of L-Glu and oleylamine(OAm),CsPbBr_(3)nanocrystals(L-Glu/OAm-CsPbBr_(3)NCs)with high water stability have been directly prepared under a mild condition at room temperature in water,facilitated by the process of crystal phase transformation from Cs_(4)PbBr_(6) to CsPbBr_(3).L-Glu/OAm-CsPbBr_(3)NCs exhibit a high quantum yield of 85%and a narrow full width at half maximum of 16 nm,demonstrating their efficient luminescence in ***,L-Glu on the surface have contributed greatly to an acidic environment and passivation of surface defects,improving the water stability and dispersibility of CsPbBr_(3)***,L-Glu/OAm-CsPbBr_(3)NCs exhibit great biocompatibility due to the presence of L-Glu,resulting in their good performance for HeLa cell ***,we propose a facile and effective method to prepare CsPbBr_(3)nanocrystals with excellent water stability by using L-Glu and OAm as cooperated ligands and expand their application in cell imaging.

关键词： aqueous synthesis cell imaging lead halide perovskite nanocrystals L-glutamic acid phase transformation

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Ag~+-induced energy level splitting in Ln-MOFs achieves enhanced Eu~(3+)emission intensity

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Science China Chemistry 2025年第3期68卷 924-934页

作者： Xiaoyong Zhai Xijiao Mu Guoying Tan Lijuan Liang Yao Kou Pingru Su Chun-Hua Yan Yu Tang State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

In lanthanide(Ln)complexes,the oversight of f-electrons and inner-shell relativistic interactions has constituted a critical gap,limiting a nuanced understanding and modulation of their luminescent *** this issue,our study introduces a pioneering series of Ln-based metal-organic frameworks(Ln-MOFs),designated as Ln-TCPP,utilizing tetraphenylpyrazinederived ligand and Ln^(3+)ions(Ln=Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb and Lu)to modulate luminescence through advanced synthesis and theoretical *** particularly emphasize the enhancement of Eu^(3+)luminescence in Ln-TCPP,where incorporating Ag^(+)ions to replace[(CH_(3))_(2)NH_(2)]^(+)within the Ln-MOFs plays a pivotal ***,by employing timedependent density functional theory(TD-DFT)with full-electron relativistic effects,we demonstrate that Ag^(+)ions induce a splitting in the energy levels of Eu^(3+).This splitting effectively reduces the rate of non-radiative transitions,significantly amplifying Eu^(3+)emission *** findings not only fill a long-standing void in understanding the all-electron relativistic interaction between f-electrons in Ln-MOFs luminescence but also establish a new strategy for controlling and optimizing the luminescent efficacy of these materials for potential applications.

关键词： lanthanide metal-organic frameworks luminescence modulation relativistic interactions energy level splitting

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Effect of phosphoric acid on leaching of monazite during low-temperature sulfuric acid cyclic leaching process

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Journal of rare earths 2025年第4期43卷 784-793,I0006页

作者： Shaochun Hou Weijun Huang Yajing Liu Bo Zhang Chenghong Liu State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou014030China College of Materials Science and Engineering Hebei University of EngineeringHandan056038China

To completely recover valuable elements and reduce the amount of waste,the impact of phosphoric acid on the decomposition of rare earth,fluorine and phosphorus during cyclic leaching was studied based on the characteristics of low-tempe rature sulfuric acid deco *** a single monazite was leached using 75 wt% H_(2)SO_(4) solution with phosphoric acid,the size and number of monazite particles in the washing slag gradually decrease with the increase in phosphoric acid content in the leaching *** monazite phase can hardly be found in the slag when the phosphoric acid content reaches 70 g/L,which indicates that phosphoric acid is favorable for monazite *** mixed rare earth concentrate was leached by 75 wt% H_(2)SO_(4) containing 70 g/L phosphoric acid,the mineral compositions of the washing slag are only gypsum and unwashed rare earth sulfuric *** cyclic leaching of75 wt% H_(2)SO_(4),the mineral compositions of the primary leaching washing slag are mainly undecomposed monazite,rare earth sulfate and calcium ***,monazite is not found in the mineral phase of the second and third leaching washing *** leaching rates of rare earth and phosphorus gradually increase with the increase in cyclic leaching *** addition,the phosphoric acid content in the leaching solution increases with the increase in the number of cyclic leaching ***,the rising trend decreases when the phosphoric acid content reaches 50 g/L by adsorption and crystallization of phosphoric acid.A small amount of water can be used to clean the leaching residue before washing to recover the more soluble phosphorus acid according to the difference of dissolution between phosphoric acid and rare earth sulfuric acid.

关键词： Low-temperature leaching Mixed rare-earth concentrate Monazite Phosphoric acid Cyclic leaching rare earths

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Agglomeration behaviors of various oxide inclusions in Fe-Al-Ti-O melts

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Journal of Iron and Steel Research International 2025年第2期32卷 399-408页

作者： Ye-guang Wang Ji Zhou Cheng-jun Liu Zhi-gang Liang Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina National Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou 014080Inner MongoliaChina

The formation of large-sized inclusions cluster severely impacts the continuous casting process and product quality of titanium-containing *** calculations were initially conducted to predict the formation of various complex oxide inclusions,namely Al_(2)O_(3),TiO_(x)and *** on that,laboratory-scale experiments were designed to prepare samples with a single type of ***,the scanning electron microscope-energy dispersive spectrometer was used for quantitative ***,the agglomeration behavior of inclusions in Fe-Al-Ti-O melt was observed in situ by high-temperature confocal laser scanning ***,a quantitative analysis of the agglomeration characteristics of the various inclusions was conducted based on the attractive forces in accordance with Newton's second law and the capillary forces as described by the Kralchevsky-Paunov *** results indicate that the size of Al_(2)O_(3)inclusions is larger than that of TiO_(x)and Al-Ti-O,but the number density of TiO_(x)is the *** on the in situ observation and the theoretical calculation,Al_(2)O_(3),TiO_(x)and Al-Ti-O inclusions can all agglomerate into large-sized clusters without segregation,but the agglomeration tendency of Al_(2)O_(3)and TiO_(x)is stronger than that of *** attractive force between Al_(2)O_(3)inclusions’pair is the largest,ranging from 2.26×10^(-15)to 6.12×10^(-14)N,followed by TiO_(x)(7.13×10^(-16)to 3.56×10^(-14)N)and Al-Ti-O(1.16×10^(-17)to 3.77×10^(-16)N).

关键词： Ti-containing steel Inclusion Agglomeration Thermodynamic calculation In situ observation

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Interfacial electron rearrangement of 3D Fe_(3)O_(4)/h-YFeO_(3)composites for efficient electromagnetic wave absorption

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 609-618页

作者： Yi Sui Yingde Zhang Guang Liu Lei Ji Junyu Yue Chen Wu Mi Yan School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China Key Laboratory of Rare Earths Chinese Academy of SciencesGanzhou 341119China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

Interface modulation is an important pathway for highly efficient electromagnetic wave ***,tailored interfaces between Fe_(3)O_(4)particles and the hexagonal-YFeO_(3)(h-YFeO_(3))framework were constructed via facile *** resulting interfa-cial electron rearrangement at the heterojunction led to enhanced dielectric and magnetic loss *** results and density function theory(DFT)simulations demonstrate a transition in electrical properties from a half-metallic monophase to metallic Fe_(3)O_(4)/h-YFeO_(3)composites,emphasizing the advantages of the formed *** transformation of electron behavior is also accompan-ied by a redistribution of electrons at the Fe_(3)O_(4)/h-YFeO_(3)heterojunction,leading to the accumulation of localized electrons around the Y-O-Fe band bridge,consequently enhancing the polarization.A minimum reflection loss of-34.0 dB can be achieved at 12.0 GHz and 2.0 mm thickness with an effective bandwidth of 3.3 GHz due to the abundant interfaces,enhanced polarization,and rational ***,the synergistic effects endow the Fe_(3)O_(4)/h-YFeO_(3)composites with high performance and tunable functional properties for efficient electromagnetic absorption.

关键词： self-assembling heterojunction electron rearrangement interface modulation electromagnetic wave absorption

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Boosting hydrocarbon conversion via Cu-doping induced oxygen vacancies on CeO_(2) in CO_(2)electroreduction

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Journal of Energy Chemistry 2025年第1期100卷 66-76页

作者： Lei Xue Tong Shi Chenhui Han Heng Zhang Fenrong Liu Haorun Li Yan Wang Xiaojun Gu Shanghong Zeng Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021Inner MongoliaChina State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina Institute of Catalysis Department of ChemistryZhejiang UniversityHangzhou 310058ZhejiangChina National Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030Inner MongoliaChina

Conversion of CO_(2)back to hydrocarbons is the most direct way of closing the“carbon cycle”,and its significance is further enlarged if this process is driven by renewable energies such as ***,precisely controlling the product selectivity towards hydrocarbons against the competitive hydrogen evolution remains challenging,especially for Cu-based ***,we report a novel defect engineering strategy,by which Cu-doping-induced oxygen vacancies on CeO_(2)nanorods were effectively created,with adjustable vacancy/Cu *** resulting optimum catalyst shows up to 79%catalytic current density to hydrocarbons(excluding CO),with 49%faradaic efficiency to *** and density functional theory unveil that the ratio between oxygen vacancy and Cu affects significantly the formation of*CHO and activation of H2O,which leads to the following deep hydrogenation to *** findings may spur new insights for designing and developing more controllable chemical process relevant to CO_(2)utilization.

关键词： Cu/CeO_(2)-x Oxygen vacancy Hydrocarbon production Reaction mechanism

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Unraveling the potential-dependent degradation mechanism in Fe–N–C catalysts for oxygen reduction reaction

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Science China Chemistry 2025年第4期68卷 1541-1549页

作者： Yuyi Chu Yuqing Cheng Pengbo Wang Jingsen Bai Xin Guan Shuo Wang Chang Lan Hongxiang Wu Zhaoping Shi Siyuan Zhu Wei Liu Changpeng Liu Meiling Xiao Wei Xing State Key Laboratory of Electroanalytic Chemistry Jilin Province Key Laboratory of Low Carbon Chemistry PowerChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Fe–N–C is hailed as the most promising candidate for replacing costly platinum-based catalysts for proton-exchange membrane fuel cells(PEMFCs)owing to their impressive catalytic activity and low ***;the durability of Fe–N–C catalysts remains a major challenge;primarily due to an insufficient understanding of their degradation *** this study;we monitor the real-time changes in the electrode during the oxygen reduction reaction(ORR);shedding light on the potentialdependent degradation mechanisms inherent to Fe–N–C *** in-situ differential electrochemical mass spectroscopy;we identify three distinct potential regions with varying degrees of performance loss;notably observing carbon corrosion signals at low *** calculations and fluorescence probe experiments corroborate that degradation mechanisms at high potentials are primarily driven by strong oxidative potentials that overcome the carbon oxidation energy barrier;whereas the degradation at low potentials is predominantly caused by the high concentrations of reactive oxygen species(ROS)generated during the *** potential-dependent carbon corrosion consequently leads to a similar dependence of demetallation of active sites on the working *** study offers a comprehensive understanding of the intrinsic interrelations among various degradation mechanisms;thus paving the way for enhancing the durability of Fe–N–C catalysts in PEMFC applications.

关键词： oxygen reduction reaction Fe-N-C catalysts stability mechanism carbon oxidation reactive oxygen species

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Endogenous/exogenous dual stimulation“ROS engineering”amplification combined with autophagy-augmented for efficient ferroptosis therapy

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Nano Research 2025年第1期18卷 597-606页

作者： Pengye Du Pengpeng Lei Yuan Liang Ran An Yi Wei Shuyu Liu Jianhao Zheng Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Department of Chemistry Tsinghua UniversityBeijing 100084China

“Reactive oxygen species(ROS)engineering”is one of the most promising anti-tumor treatments developed in recent *** explosion of ROS will cause oxidative stress,thereby inducing tumor cell ***,ROS accumulation in tumor cells is eliminated by endogenous cellular self-regulation *** this work,a kind of endogenous/exogenous dual stimulation nanoagent noted as UMZC is *** reaction occurs between NH_(2)-MIL-88B(Fe)contained in UMZC and the overexpression of endogenous H_(2)O_(2)to generate ROS,amplified by endogenous H_(2)S of colon tumor *** addition,NH_(2)-MIL-88B(Fe)also functions to deplete glutathione(GSH)for stopping it from consuming *** nanoparticles at the core of UMZC convert near-infrared into visible light,which excites zinc phthalocyanine to initiate the photochemical reaction that generates more ROS,thus alleviating the lack of tissue penetration depth for visible *** agonist chitosan oligosaccharides induce enhancement of cellular autophagy for disrupting cellular metabolic stress and the resistance to oxidative stress of tumor cells,allowing“ROS engineering”to fully exert anti-tumor *** of ROS generation,GSH depletion,and induced cellular autophagy caused by nanoagents have promoting effects on the occurrence of ***,the nanoagents show the ability to effectively treat colon tumors.

关键词： reactive oxygen species(ROS)engineering upconversion nanoparticles cellular autophagy ferroptosis tumor therapy

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Enhanced high-frequency properties of FeSiCr soft magnetic composites with La-doped YIG as insulating layer

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Ceramics International 2025年第12期51卷 15983-15990页

作者： Xu, Zhihui Li, Jing Peng, Xiaoling Tao, Shan Xu, Jingcai Hong, Bo Wang, Xinqing College of Materials Sciences and Chemistry China Jiliang University Hangzhou310018 China Magnetism Key Laboratory of Zhejiang Province China Jiliang University Hangzhou310018 China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou014030 China

In this study, nano-sized La-doped YIG (Y3-xLaxFe5O12, x = 0.00, 0.03, 0.05, 0.08, 0.10, and 0.15) were prepared using a reverse co-precipitation method, which were then combined with FeSiCr powder to create a novel FeSiCr/Y3-xLaxFe5O12 soft magnetic composite (SMC). X-ray Diffraction (XRD) analysis confirmed the successful incorporation of La into the YIG lattice. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) scans demonstrated that a uniform insulating layer of La-doped YIG was effectively coated on the FeSiCr particles. The results revealed that the Y2.92La0.08Fe5O12 powders showed the highest Ms of 22.334 emu/g. Furthermore, the FeSiCr/Y3-xLaxFe5O12 SMCs exhibited notable improvements both in permeability and core loss with a La doping concentration of x = 0.08 (Pcv = 122.35 mW/cm3, μe = 51.034 at 10 mT and 500 kHz), accompanied by an enhancement of DC bias characteristics. This work optimized the magnetic properties of YIG with La doping and constructed a novel FeSiCr/La-doped YIG SMCs with enhanced high-frequency performance. © 2025

关键词： Energy dispersive spectroscopy

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