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Nano Research 2024年第6期17卷 5336-5348页

作者： Alevtina Smekhova Daniel Gaertner Alexei Kuzmin Ana Guilherme Buzanich Goetz Schuck Ivo Zizak Gerhard Wilde kiril. v.yusenko Sergiy Divinski Helmholtz-Zentrum Berlin für Materialien und Energie(HZB) D-12489 BerlinGermany Institute of Materials Physics University of MünsterD-48149 MünsterGermany Institute of Solid State Physics University of LatviaLV-1063 RigaLatvia Bundesanstalt für Materialforschung und–prüfung(BAM) D-12489 BerlinGermany

Multi-edge extended X-ray absorption fine structure(EXAFS)spectroscopy combined with reverse Monte Carlo(RMC)simulations was used to probe the details of element-specific local coordinations and component-dependent structure relaxations in single crystalline equiatomic CrMnFeCoNi high-entropy alloy as a function of the annealing *** representative states,namely a high-temperature state,created by annealing at 1373 K,and a low-temperature state,produced by long-term annealing at 993 K,were compared in *** features identified in atomic configurations of particular principal components indicate variations in the local environment distortions connected to different degrees of compositional disorder at the chosen representative *** detected changes provide new atomistic insights and correlate with the existence of kinks previously observed in the Arrhenius dependencies of component diffusion rates in the CrMnFeCoNi high-entropy alloy.

关键词： high-entropy alloys diffusion short-range order extended X-ray absorption fine structure(EXAFS) reverse Monte Carlo

Al-driven peculiarities of local coordination and magnetic properties in single-phase Al_(x)-CrFeCoNi high-entropy alloys

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Nano Research 2022年第6期15卷 4845-4858页

作者： Alevtina Smekhova Alexei Kuzmin Konrad Siemensmeyer Chen Luo Kai Chen Florin Radu Eugen Weschke Uwe Reinholz Ana Guilherme Buzanich kiril. v.yusenko Helmholtz-Zentrum Berlin für Materialien und Energie(HZB) D-12489Germany Institute of Solid State Physics University of LatviaLV-1063Latvia Bundesanstalt für Materialforschung und-prüfung(BAM) D-12489Germany

Modern design of superior multi-functional alloys composed of several principal components requires in-depth studies of their local structure for developing desired macroscopic ***,peculiarities of atomic arrangements on the local scale and electronic states of constituent elements in the single-phase face-centered cubic(fcc)-and body-centered cubic(bcc)-structured high-entropy Alx-CrFeCoNi alloys(x=0.3 and 3,respectively)are explored by element-specific X-ray absorption spectroscopy in hard and soft X-ray energy *** based on the reverse Monte Carlo approach allow to perform a simultaneous fit of extended X-ray absorption fine structure spectra recorded at K absorption edges of each 3d constituent and to reconstruct the local environment within the first coordination shells of absorbers with high *** revealed unimodal and bimodal distributions of all five elements are in agreement with structure-dependent magnetic properties of studied alloys probed by magnetometry.A degree of surface atoms oxidation uncovered by soft X-rays suggests different kinetics of oxide formation for each type of constituents and has to be taken into account.X-ray magnetic circular dichroism technique employed at L2,3 absorption edges of transition metals demonstrates reduced magnetic moments of 3d metal constituents in the sub-surface region of in situ cleaned fcc-structured Al0.3-CrFeCoNi compared to their bulk *** to nanostructured versions of multicomponent alloys,such studies would bring new insights related to effects of high entropy mixing on low dimensions.

关键词： high-entropy alloys reverse Monte Carlo magnetism element-specific spectroscopy extended X-ray absorption fine structure(EXAFS) X-ray magnetic circular dichroism(XMCD)

Batch Adsorption of Nickel from Aqueous Solution by Natural Zeolite-Equilibrium Study

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Journal of Chemistry and Chemical Engineering 2011年第6期5卷 528-534页

作者： Dejan v. Dimltrovski Zoran Lj. Bozinovski kiril.T. Lisichkov Stefan v. Kuvendjiev Department of Chemical and Control Engineering Faculty of Technology and Metallurgy Skopje Republic of Macedonia Center for Sanitary Control and Supervision ＂Water Supply and Sewage ＂ Public Enterprise Skopje Republic of Macedonia

The paper presents the study of the equilibrium conditions during the nickel removal from aqueous solutions using natural zeolite in batch process. The purpose of this investigation was the application of a adequate, inexpensive and economically effective adsorbent available in large quantities for treatment of underground, superficial and waste waters. Experimental investigations were made in a glass container by stirring with magnetic mixer on 500 rpm with 100 mL of water, *** of 5 to 40 g.L^-1, adsorbent granules size 〈 0.4 mm, and mixing time of 360 minutes. The nickel content in the aqueous solution was changed within the 0.05 to 0.40 mgNi.L^-1. Examining the experiments data helped to define the influence of the nickel concentration equilibrium, the adsorbent capacity, on one side, and the equilibrium degree of nickel removal depending on the initial nickel concentration in the water, as well the adsorbent content in the treated solution.

关键词：平衡条件天然沸石镍含量水溶液吸附剂实验数据浓度平衡批处理过程

Research Article Local structure and magnetic properties of a nanocrystalline Mnrich Cantor alloy thin film down to the atomic scale

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Nano Research 2023年第4期16卷 5626-5639页

作者： Alevtina Smekhova Alexei Kuzmin Konrad Siemensmeyer Chen Luo James Taylor Sangeeta Thakur Florin Radu Eugen Weschke Ana Guilherme Buzanich Bin Xiao Alan Savan kiril. v.yusenko Alfred Ludwig Helmholtz-Zentrum Berlin für Materialien und Energie(HZB) Berlin D-12489Germany Institute of Solid State Physics University of LatviaRiga LV-1063Latvia Physik-Department Technische Universität MünchenGarching D-85748Germany Institut für Experimentalphysik Freie Universität BerlinBerlin 14195Germany Bundesanstalt für Materialforschung und-prüfung(BAM) Berlin D-12489Germany Institut für Werkstoffe Ruhr-Universität BochumBochum D-44801Germany

The huge atomic heterogeneity of high-entropy materials along with a possibility to unravel the behavior of individual components at the atomic scale suggests a great promise in designing new compositionally complex systems with the desired ***,we apply multi-edge X-ray absorption spectroscopy(extended X-ray absorption fine structure(EXAFS),Xray absorption near edge structure(XANES),and X-ray magnetic circular dichroism(XMCD))to probe the structural,electronic,and magnetic properties of all individual constituents in the single-phase face-centered cubic(fcc)-structured nanocrystalline thin film of Cr_(20)Mn_(26)Fe_(18)Co_(19)Ni_(17)(at.%)high-entropy alloy on the local *** local crystallographic ordering and componentdependent lattice displacements were explored within the reverse Monte Carlo approach applied to EXAFS spectra collected at the K absorption edges of several constituents at room temperature.A homogeneous short-range fcc atomic environment around the absorbers of each type with very similar statistically averaged interatomic distances(2.54-2.55Å)to their nearest-neighbors and enlarged structural relaxations of Cr atoms were *** and XMCD spectra collected at the L2,3 absorption edges of all principal components at low temperature from the oxidized and in situ cleaned surfaces were used to probe the oxidation states,the changes in the electronic structure,and magnetic behavior of all constituents at the surface and in the sub-surface volume of the *** spin and orbital magnetic moments of Fe,Co,and Ni components were quantitatively *** presence of magnetic phase transitions and the co-existence of different magnetic phases were uncovered by conventional magnetometry in a broad temperature range.

关键词： high-entropy alloys reverse Monte Carlo(RMC) element-specific spectroscopy extended X-ray absorption fine structure(EXAFS) X-ray magnetic circular dichroism(XMCD) magnetism