A5062360888- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Magnetic properties of thin films
- Iron-based superconductors research
- Magnetic Properties and Synthesis of Ferrites
- Microstructure and Mechanical Properties of Steels
- Hydrogen Storage and Materials
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Physics of Superconductivity and Magnetism
- X-ray Diffraction in Crystallography
- Iron oxide chemistry and applications
- Crystallography and Radiation Phenomena
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Crystallization and Solubility Studies
- Fusion materials and technologies
- High-pressure geophysics and materials
- Metallic Glasses and Amorphous Alloys
- Inorganic Chemistry and Materials
- Characterization and Applications of Magnetic Nanoparticles
- Hydrogen embrittlement and corrosion behaviors in metals
- Magneto-Optical Properties and Applications
- Magnetism in coordination complexes
- Intermetallics and Advanced Alloy Properties
AGH University of Krakow
2015-2024
Jagiellonian University
2001-2024
CeNTI (Portugal)
2016-2020
Laboratoire de physique des Solides
2017
Uniwersytet Komisji Edukacji Narodowej w Krakowie
2008-2015
Ottawa University
2015
Institute of Nuclear Physics, Polish Academy of Sciences
2011
Institute of Physics
2008
Institute for Energy Technology
2007
Max Planck Institute of Microstructure Physics
2005-2006
We present a novel and facile method enabling synthesis of iron oxide nanoparticles, which are composed mainly maghemite according to X-ray diffraction (XRD) Mössbauer spectroscopy studies. The proposed process is realized by anodic polarization in deaerated LiCl solutions containing both water ethanol. Water seems play an important role the synthesis. Morphology product was studied means transmission electron microscopy XRD. In solution almost 100% black suspension round shaped...
Which way to choose? The trimetallic cyanide-bridged Fe6Co3W6 cluster serves as a molecular platform for two cooperating electron-transfer channels, WV–CN–HSCoII⇄WIV–CN–LSCoIII and WV–CN–HSFeII⇄WIV–CN–HSFeIII. {CoII3FeII6[WV(CN)8]6(MeOH)24}⋅x MeOH has first-order unique spin transition with thermal charge-transfer-induced bistability that is due specific distribution of Co Fe sites. Detailed facts importance specialist readers are published "Supporting Information". Such documents...
Zinc doping of superparamagnetic iron oxide nanoparticles coated with an ionic derivative chitosan significantly improves their properties for magnetic hyperthermia.
Parent compounds AFe${}_{2}$As${}_{2}$ (A $=$ Ca, Ba, Eu) of the 122 family iron-based superconductors have been studied by $^{57}\mathrm{Fe}$ M\"ossbauer spectroscopy in temperature range 4.2--\ensuremath{\sim}300 K. Spin density waves (SDW) found with some confidence. They are either incommensurate lattice period or ratio respective periods is far away from small integers. SDW shape very unconventional (i.e., differs sinusoidal shape). Magnetic order starts lowered as narrow sheets...
A bimetallic pentadecanuclear cyanido-bridged {Fe9[W(CN)8]6 (MeOH)24}·xMeOH cluster of an FeII/III–WIV/V mixed valence nature, reveals a reversible single-crystal-to-single-crystal transformation, concomitant with metal-to-metal charge transfer between Fe and W ions. The dominance HSFeII–NC–WV units at high temperature, HSFeIII–NC–WIV low leads to unprecedented reversed thermal hysteresis loop in magnetic measurements.
Synthesis of spinel zinc ferrite ultrafine needle-like particles that exhibit exceptional stability in aqueous dispersion (without any surfactants) and superparamagnetic response is reported. Comprehensive structural magnetic characterization the performed using X-ray electron diffraction, small angle scattering, transmission microscopy, dynamic light vibrating sample magnetometry, Mössbauer spectroscopy high-resolution spectroscopy. It reveals nearly stoichiometric ZnFe2O4 nanorods with...
The metal–organic framework [Fe(ta)2] (Hta = 1H-1,2,3-triazole) containing Fe(II) ions and 1,2,3-triazolate ligands shows a reversible phase transition while retaining the cubic crystal symmetry space group Fd3m (no. 227). between room temperature (RT-[Fe(ta)2]; 16.6315(2) Å, V 4600.39(8) Å3) high (HT-[Fe(ta)2]; 17.7566(4) 5598.6(1) phases occurs at above 290 °C, whereas HT- RT-[Fe(ta)2] starts below 210 °C. Both polymorphs have identical bond topologies, but they differ by large increase of...
The compound EuFe${}_{2\ensuremath{-}x}$Co${}_{x}$As${}_{2}$ was investigated by means of ${}^{57}$Fe and ${}^{151}$Eu M\"ossbauer spectroscopy versus temperature (4.2--300 K) for $x$ = 0 (parent), 0.34--0.39 (superconductor), 0.58 (overdoped). It found that the spin density wave (SDW) is suppressed Co substitution; however, it survives in region superconductivity, but iron spectra exhibit some nonmagnetic components superconducting region. Europium orders magnetically, regardless cobalt...
An alternating bimetallic {(H3O)[Ni(III)(cyclam)][Fe(II)(CN)6]·5H2O}n chain undergoes reversible dehydration at 40 °C accompanied by electron transfer which leads to Ni(II)-Fe(III) in about 50% of metal centres. The hydrated dark blue form is a paramagnet while the dehydrated yellowish-green shows ferromagnetic coupling between neighbouring Ni(II) and Fe(III).
A thorough study of ${\mathrm{EuZn}}_{2}{\mathrm{P}}_{2}$ single crystals, which were grown from Sn flux, was performed using both bulk (heat capacity, ac susceptibility, dc magnetization, electrical resistivitivity, magnetoresistance) and microscopic (M\"ossbauer spectroscopy) techniques. Electrical resistance magnetic susceptibility measured also under high pressure conditions (up to 19 9.5 GPa, respectively). Further insight into electronic properties phonons is provided by ab initio...
We have synthesized the octacyanoniobate-based cyano-bridged 3D ferromagnet {[FeII(H2O)2]2[NbIV(CN)8]·4H2O}n1 and characterized structurally, spectroscopically (XANES/EXAFS, IR, UV-Vis, Resonance Raman, 57Fe Mössbauer spectroscopy) magnetically. 1 crystallizes in tetragonal system, space group I4/m, a = 11.989(5) Å, c 13.237(5) V 1902.6(13) Å3. coordination architecture comprises two types of NbIV–C–N–FeIIHS (HS high spin) linkages with Fe–N–C angles 154.5° 167.5°. The XANES/EXAFS spectra at...
Magnetite is often the subject of M\"ossbauer spectroscopy experiments either as a part fundamental research this compound or during various geological studies. However, complicated structure low-temperature phase magnetite exhibits 24 crystallographic iron sites, which presents considerable obstruction for spectrum interpretation. In work, we carried out ab initio calculations to obtain complete set hyperfine parameters all and used these simulate corresponding spectrum. Simulation analysis...
The maximum magnetisation (saturation magnetisation) obtainable for iron oxide nanoparticles can be increased by doping the nanocrystals with non-magnetic elements such as zinc. Herein, we closely study how only slightly different synthesis approaches towards doped strongly influence resulting sub-nano/atomic structure. We compare two co-precipitation approaches, where vary base (NaOH versus NH3), and a thermal decomposition route. These methods are most commonly applied ones synthesising...
The aim of this research is to study the role nanocrystalline TiO 2 /SnO n–n heterojunctions for hydrogen sensing. Nanopowders pure SnO , 90 mol % /10 10 /90 and have been obtained using flame spray synthesis (FSS). samples characterized by BET, XRD, SEM, HR-TEM, Mössbauer effect impedance spectroscopy. Gas-sensing experiments performed H concentrations 1–3000 ppm at 200–400 °C. nanomaterials are well-crystallized, anatase rutile cassiterite polymorphic forms present depending on chemical...
We present a new, simple heating up method leading to the smallest Cu–Fe–S nanocrystals ever reported (from 2 3 nm).
Superparamagnetic ferrite nanoparticles coated with a polymer layer are widely used for biomedical applications. The objective of this work is to design as magnetic resonance imaging (MRI) temperature-sensitive contrast agent. Copper-zinc poly(ethylene glycol) (PEG) synthesized using one-step thermal decomposition method in matrix. resulting stable water and biocompatible. Using Mössbauer spectroscopy magnetometry, it was determined that the grown exhibit superparamagnetic properties....