A5037532202- Advancements in Battery Materials
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Magnetic Properties of Alloys
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Magnetic properties of thin films
- Advanced Battery Technologies Research
- Advanced Condensed Matter Physics
- Crystallography and Radiation Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Battery Materials and Technologies
- Iron oxide chemistry and applications
- Magnetic Properties and Synthesis of Ferrites
- Magnetic Properties and Applications
- Advanced Electron Microscopy Techniques and Applications
- Catalytic Processes in Materials Science
- Advanced Materials Characterization Techniques
- Nanocluster Synthesis and Applications
- X-ray Diffraction in Crystallography
- Inorganic Chemistry and Materials
- Electron and X-Ray Spectroscopy Techniques
- Anodic Oxide Films and Nanostructures
- Intermetallics and Advanced Alloy Properties
- Electrodeposition and Electroless Coatings
University of Białystok
2015-2024
ALBA Synchrotron (Spain)
2015-2022
European Synchrotron Radiation Facility
2016
Centre for Research on Ecology and Forestry Applications
2016
University of Warsaw
1991-1994
CLÆSS is a general-purpose absorption spectroscopy beamline at the ALBA CELLS Spanish synchrotron. Its optical layout presented here along with its powerful capabilities for collecting spectra high signal to noise ratio in an unusually wide energy range (2.4–63.2 keV). Continuous scanning quick scans available, allowing collect X-ray near edge structure and extended fine 3–5 8–10 min, respectively. The full automatization of allows performing successive measurements different conditions...
Polyanionic materials such as Na3V2(PO4)2F3–yOy (0 ≤ y 2) are of high interest positive electrode for Na-ion batteries since they offer competitive electrochemical performances compared to sodiated transition metal oxides. The composition Na3V2(PO4)2F3 (y = 0) has the highest theoretical energy density among series, but surprisingly a lot discrepancies reported throughout literature considering its structure and properties. We will show that most compounds being Na3VIII2(PO4)2F3 in fact...
The synthesis, characterization and assessment of the antibacterial properties hydrophilic silver nanoparticles (AgNPs) were investigated with aim to probe their suitability for innovative applications in field nanobiotechnology. First, synthetized functionalized two capping agents, namely 3-mercapto-1-propansulfonate (3MPS) 1-β-thio-d-glucose (TG). investigation structural electronic nano-systems was carried out by means X-ray Photoelectron Spectroscopy (XPS) Absorption (XAS). XPS data...
Atomically precise thiolate protected Au nanoclusters Au38(SC2H4Ph)24 on CeO2 were used for in-situ (operando) extended X-ray absorption fine structure/diffuse reflectance infrared fourier transform spectroscopy and ex situ scanning transmission electron microscopy–high-angle annular dark-field imaging/X-ray photoelectron studies monitoring cluster structure changes induced by activation (ligand removal) CO oxidation. Oxidative pretreatment at 150 °C "collapsed" the clusters' ligand shell,...
The potential energy surfaces for Ar–CO and He–CO were calculated at the fourth order Mo/ller–Plesset perturbation theory analyzed using of intermolecular forces. Both complexes reveal only one minimum related to approximately T-shaped geometry. For Ar–CO, our best ab initio estimates Re De are 3.70 Å 496 μhartrees, respectively, optimal angle Rg–com–O is about 80°. He–CO, 3.4 100 70°. Our geometrical parameters agree very well with experimental data. depths estimated be within ±5% in error...
Lithium-rich transition-metal-oxide cathodes are among the most promising materials for next generation lithium-ion-batteries because they operate at high voltages and deliver capacities. However, their cycle-life remains limited, individual roles of transition-metals still not fully understood. Using bulk-sensitive X-ray absorption emission spectroscopy on Li[Li0.2Ni0.16Mn0.56Co0.08]O2, we inspect behavior Mn, generally considered inert upon electrochemical process. During first charge Mn...
Reusable dual-purpose nanocomposite foams with AgNPs showed high stability even after 2 years of storage.
We have investigated the local structure of differently charged NaxCoO2 cathode material as a function temperature by Co K-edge X-ray absorption fine (EXAFS) measurements. found that charge/discharge process has direct effect on bond characteristics in Na-ion batteries. The results reveal Co–O bonds get softer, while Co–Co hardly show any change during discharge (sodiation). present study underlines key role atomic displacements diffusion and reversibility ions cathodes for batteries points...
The Mössbauer measurements performed on powdered single crystals of FeTe0.5Se0.5 (Tc ~ 14.7 K) reveal minor content two impurity phases, identified as Fe3O4 and Fe7Se8, among the major tetragonal phase. From shape subspectra it follows that Fe7Se8 behaves in superparamagnetic manner, most likely because randomly distributed Fe vacancies lattice structure Te Se. magnetite absorber exposed to ambient air conditions remains unchanged during period 16 months. Ageing effects were observed for...
Abstract Recently, ammonia-thermal reaction has been used for molecular intercalation in layered FeSe, resulting a new Li x (NH 3 ) y Fe 2 Se superconductor with T c ~ 45 K. Here, we have temperature dependent extended x-ray absorption fine structure (EXAFS) to investigate local atomic displacements single crystals of this superconductor. Using polarized EXAFS at K-edge obtained direct information on the Fe-Se and Fe-Fe bondlengths corresponding mean square relative (MSRD). We find that...
Electrochemical deposition is a very efficient method for producing many types of modern materials.The not expensive and does have limit sample size.In our work the preparation Ni, Co Fe nanowires presented.The obtained had different diameter length which were tunable by template porous material time deposition, respectively.The quality prepared wires was dependent also on mode.The smallest around 40 nm in anodic alumina oxide from oxalic acid.The largest ones, 120 nm, produced phosphoric...
Abstract In this study, the Mössbauer spectroscopy and neutron powder diffraction were used for characterisation of GaFeO3 samples prepared by two different methods, solid state reaction sol–gel synthesis. The have similar structures that differ in distributions Fe Ga among pertinent sites. also magnetic transition temperatures. We studied how to adopt method invariants, developed earlier decomposition spectra into site components, case interactions dominating over small quadrupole...
X-ray absorption spectroscopy measurements were used to determine the structure of first coordination shell Fe(II) ions in aqueous and acetone based solutions. Extended fine analysis coupled with ab initio near edge calculations confirms octahedral iron ion water solution. Data collected for rich solutions can be reproduced assuming coexistence Fe(H2O)62+ tetrahedral [FeCl4]2– complexes. Distortion was detected some
Abstract Combining micro-X-ray absorption spectroscopy (μXAS) and fluorescence (μXRF) is a promising approach for the investigation of complex multi-phase systems. In this work, we have employed to investigate natural sphalerite, most common form Zinc Sulfide. Spatially resolved elemental distribution maps 3d metal atoms (Zn, Cu, Ni, Co, Fe) are superimposed with chemical speciation structural parameter in order understand sphaleriteore-formation process metamorphosis. Chemical parameters...
Electrochemistry is a method, which can be used for creation of nanomaterials. This method has big advantage such as no restriction shape and size the sample do not need to involve expensive equipment preparation. In paper preparation Fe nanowires well Co Ni are presented. The diameter length obtained tuned by properties template porous material time deposition, respectively. quality depends also from deposition mode (AC - alternating current or DC constant current) pH solution. anodization...
The local structural and electronical transformations occurring along the first charge discharge cycle of Li- Mn-rich Li[Li0.2Ni0.16Mn0.56Co0.08]O2 cathode material have been characterized by X-ray absorption spectroscopy at several complementary edges. irreversible spinel formation, expenses cycling layered phase during charge, is quantified (about 10%) spatially localized. strains induced Ni oxidation evaluated. They induce formation a low spin Mn3+ in structure parallel to particles bulk....
Temperature-dependent Fe K-edge extended X-ray absorption fine structure (EXAFS) and Kβ emission spectroscopy (XES) measurements are used to study the local magnetic moment in self-doped CaKFe4As4 superconductor. The Fe–As Fe–Fe bond lengths show thermal expansion similar one found other iron-based superconductors. arsenic height from plane changes anomalously with a sharp decrease vicinity of superconducting transition temperature. XES reveals that is low spin state, decreases sharply while...
The reversible and irreversible cationic anionic charge compensation mechanisms occurring along the first discharge cycle of Li- Mn-rich Li[Li0.2Ni0.16Mn0.56Co0.08]O2 cathode material at (dis)charge rates 0.1C 5C have been identified quantified by X-ray absorption emission spectroscopy. analysis provided oxidation states transition metals, Mn local coordination, lattice elastic constants. Lattice softening occurs charge, while a minor spinel phase forms irreversibly expense layered phase....
Co-doped Au
Temperature-dependent x-ray absorption (XAS) and high-pressure (HP) Raman spectroscopy results on two prominent β-metal(II) hydroxides, viz. β-Ni(OH)2 β-Co(OH)2 are presented. data at ambient conditions show the phonons to be softer than ones. Analysis of extended fine structure metal K-edge as a function temperature reveals Einstein frequencies metal-oxygen metal-metal bonds be, respectively, 309 for same 385 β-Ni(OH)2. In both up about 10 GPa, HP continuous hardening phonon modes...