Search

Your search keyword '"Satuła, D."' showing total 186 results
Start Over Author "Satuła, D."
186 results on '"Satuła, D."'

1. M\'ossbauer measurements of GaFeO$_3$ single crystal multiferroic

Author

Szymański, K., Olszewski, W., Butkiewicz, P., Biernacka, M., Satuła, D., Rećko, K., and Szafrański, M.

Subjects
Condensed Matter - Other Condensed Matter
Abstract

M\"ossbauer measurements on single crystal absorbers at room and at low temperatures were performed. The results are fully consistent with previously published reports by other groups. Spectra of single crystals were simultaneously analyzed including magnetic dipole and electric quadrupole interactions. The analysis shows that there is a small component of magnetic moments perpendicular to the magnetic easy axis. M\"ossbauer data seem not agree with commonly accepted ferrimagnetic structure of GaFeO$_3$.

Published
2021
Full Text
View/download PDF

7. M\'ossbauer studies of powdered single crystals of FeTe0.5Se0.5

Author

Szymański, K., Olszewski, W., Dobrzyński, L., Satuła, D., Gawryluk, D. J., Berkowski, M., Puźniak, R., and Wiśniewski, A.

Subjects
Condensed Matter - Superconductivity
Abstract

The M\"ossbauer measurements performed on powdered single crystals of FeTe0.5Se0.5 (Tc ~ 14.7 K) reveal minor content of two impurity phases, identified as Fe3O4 and Fe7Se8, among the major tetragonal phase. From the shape of impurity subspectra it follows that Fe7Se8 behaves in superparamagnetic manner, most likely because of randomly distributed Fe vacancies in the lattice structure of Fe Te Se. The magnetite content in the powdered absorber exposed to ambient air conditions remains unchanged during period of 16 months. Ageing effects were observed for the samples stored under argon atmosphere and small increase of the isomer shift of the doublet was detected. Presented temperature dependence of the hyperfine parameters can be explained as due to possible orthorhombic distortion or to temperature behaviour of impurity phases Fe3O4 and Fe7Se8. Strong tendency to formation of crystalline texture of powdered sample is observed., Comment: 13 pages, 8 figures

Published
2011
Full Text
View/download PDF

26. Selected properties of surface modified GaxFe3-xO4 with 0≤x≤1.5.

Author

Orzechowska, M., Rećko, K., Soloviov, D., Klekotka, U., Biernacka, M., Satuła, D., Olszewski, W., Kalska-Szostko, B., Beskrovnyy, A., and Szymański, K.

Subjects
SURFACE properties, SPONTANEOUS magnetization, TERBIUM, MAGNETIC nanoparticles, MAGNETISM, MAGNETIZATION
Abstract

The influence of the surface modification on the magnetism of 4–14 nm sized core and core/shell gallium ferrites obtained by different preparation methods (Massart's and thermal decomposition from acetylacetonates) was studied. The physical properties of GaxFe3-xO4 were investigated in a wide range of Ga admixtures 0 ≤ x ≤ 1.5. Ga ions location at 8a or/and 16d positions of a spinel structure depends on the synthesis method and has a pronounced effect on the superparamagnetic properties of nanoparticles. Magnetization and Mössbauer experiments show the dominant superparamagnetic contribution for the nanoparticles with x > 0.8 with the blocking temperature TB significantly below 200 K. Surface-modified nanoferrites disclosed spontaneous magnetization that does not exceed 60 emu/g. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

34. Mössbauer measurements of GaFeO3 single crystal multiferroic.

Author

Szymański, K., Olszewski, W., Butkiewicz, P., Biernacka, M., Satuła, D., Rećko, K., and Szafrański, M.

Abstract

Mössbauer measurements on single crystal absorbers at room and at low temperatures were performed. The results are fully consistent with previously published reports by other groups. Spectra of single crystals were simultaneously analyzed including magnetic dipole and electric quadrupole interactions. The analysis shows that there is a small component of magnetic moments perpendicular to the magnetic easy axis. Mössbauer data seem not agree with commonly accepted ferrimagnetic structure of GaFeO3. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

45. Phase composition and magnetism of sol-gel synthesized Ga-Fe-O nanograins.

Author

Rećko, K., Waliszewski, J., Klekotka, U., Soloviov, D., Ostapczuk, G., Satuła, D., Biernacka, M., Balasoiu, M., Basa, A., Kalska-Szostko, B., and Szymański, K.

Subjects
ORTHORHOMBIC crystal system, ATMOSPHERIC pressure, GALLIUM, X-ray diffraction, SMALL-angle neutron scattering
Abstract

We have succeeded in synthesizing orthorhombic Ga(1_X)Fe(1+X)03 (-0.05 ≤ x ≤ 0.5), hexagonal GayFe(2-y)O3 (0 ≤ y ≤1.8) and cubic Ga(1+Z)Fe(2-Z)04 (--0.1 ≤ z ≤ 0.8) nanograins of gallium ferrites using conventional precursors and an organic environment of Pechini scenario under atmosphericpressure conditions (SG method). Phase composition and homogeneity were analyzed using X-ray diffraction. Small angle neutron scattering disclosed ellipsoidal particle shapes of gallium iron oxides (GFO) crystallizing in orthorhombic (o-GFO) and hexagonal (h-GFO) symmetry and parallelepiped shapes of Ga(1+y)Fe(2-y)O4 (c-GFO) grains. Despite local agglomeration among the magnetic grains, the scanning electron microscopy and transmission electron microscopy images point to faced-elliptical shapes. The Mössbauer spectroscopy with magnetization measurements was carried out in the temperature range of 5-295 K. The analysis of gallium ferrites magnetism demonstrates that iron atoms locate with various probabilities in crystallography positions and the spontaneous magnetization preserves up to room temperature (RT). [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

46. Hyperfine interactions of 57Fe in Pt3Fe in Pt 3Fe - Ab initio and Mossbauer effect studies

Author

Deniszczyk, Józef, Satuła, D., Waliszewski, J., Rećko, K., Olszewski, W., Parzych, G., and Szymański, K.

Subjects
metale przejściowe, elektroniczna struktura materiałów sypkich, gęstość elektronowa stanów, Computer Science::Neural and Evolutionary Computation, Physics::Medical Physics, struktura pasmowa krystalicznych ciał stałych, żelazo, spektroskopia, całkowite obliczenia energii i energii kohezyjnej, stopy, Physics::Optics, związki międzymetaliczne, efekt Mössbauera
Abstract

The Mossbauer effect and ab initio investigations of an electric ¯eld gradient at 57Fe nuclei in Pt3Fe compound are presented. It is shown that nonzero 57Fe electric ¯eld gradient exists in the cubic Pt3Fe. Ab initio study of Pt3Fe in antiferromagnetic state con¯rms the presence of electric ¯eld gradient at 57Fe nuclei. Lattice, local valence electron (3d, 4p) and weakly bound 3p core electron contributions to electric ¯eld gradient are separated out and discussed in the context of the electronic structure changes upon the antiferromagnetic phase transition.

Published
2009

Catalog

Books, media, physical & digital resources
See catalog results