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1
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Mössbauer Studies of Core-Shell Nanoparticles.

100%
Kalska-Szostko B., Cydzik M., Satuła D., Giersig M.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
15-17
EN
The ferrite magnetic nanoparticles with core-shell structures were obtained in two step preparation process. The Mössbauer spectra obtained for particles of pure maghemite or magnetite and two layered core-shell one the magnetite on maghemite and maghemite on magnetite are very different from each other. The presented results show that interparticle and intraparticle interaction plays important role in overall magnetic properties as well.
2
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Maximum Entropy Method in Mössbauer Spectroscopy - a Problem of Magnetic Texture

100%
Satuła D., Szymański K., Dobrzyński L.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
78-80
EN
A reconstruction of the three dimensional distribution of the hyperfine magnetic field, isomer shift and texture parameter z from the Mössbauer spectra by the maximum entropy method is presented. The method was tested on the simulated spectrum consisting of two Gaussian hyperfine field distributions with different values of the texture parameters. It is shown that proper prior has to be chosen in order to arrive at the physically meaningful results.
3
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Studies of the Magnetite Nanoparticles by Means of Mössbauer Spectroscopy

100%
Kalska-Szostko B., Zubowska M., Satuła D.
Acta Physica Polonica A
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2006
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vol. 109
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issue 3
365-369
EN
The magnetite nanoparticles were prepared by modified Massart's method in water and in alcohol. The influence of the condition of preparation on the properties of magnetite nanoparticles were investigated by Mössbauer spectroscopy. The size of the particles were determined by transmission electron microscopy. It was shown that the particles size in the alcoholic reaction is smaller than in aqueous reaction. Moreover, the increase in the reaction time improves the stoichiometry of magnetite nanoparticles.
4
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Magnetic Moments' Arrangement in Fe Layers Deposited from Acetone Based Electrolyte

88%
Olszewski W., Szymański K., Satuła D., Biernacka M., Talik E.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1631-1640
EN
The acetone based electrolyte was used for electrodeposition of iron layers on the copper substrate. Two types of surfaces of the deposited layer can be obtained: shiny or black. Magnetic properties of the near-surface regions were studied by the conversion electron Mössbauer spectroscopy. The conversion electron Mössbauer spectra revealed apparent dependence of magnetic moments' arrangement on the deposition time. Those results were compared with the magnetization measurements. Composition of black coating was examined by the X-ray photoelectron spectroscopy measurements.
5
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Application of Bayesian Reasoning and the Maximum Entropy Method to Some Reconstruction Problems

88%
Fornalski K., Parzych G., Pylak M., Satuła D., Dobrzyński L.
Acta Physica Polonica A
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2010
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vol. 117
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issue 6
892-899
EN
The so-called Bayesian reasoning is applied whenever uncertainty has to be considered as serious factor in interpretation of results. The paper presents analysis of the impact of inaccurate data on the straight line and quadratic relation fittings. This type of analysis is particularly important when one tries to decide on the type of dependence. The paper also shows examples of the Maximum Entropy Methods applied to the reconstruction of the hyperfine parameters distribution from the measured Mössbauer spectra of GaFeO_{3} and the electron-positron momentum distribution from the positron annihilation data of Gd.
6
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Microstructure and Magnetic Properties of Iron Oxide Nanoparticles Prepared by Wet Chemical Method

88%
Satuła D., Kalska-Szostko B., Szymański K., Dobrzyński L., Kozubowski J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1615-1621
EN
The magnetic properties of iron oxide nanoparticles prepared by the chemical decomposition of the iron chlorides with the ratio Fe^{3+}/Fe^{2+}=2.25 were studied by means of transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy in- and without external magnetic field. The transmission electron microscopy studies show that the nanoparticles have spherical shape with diameter about 13 nm. The transmission electron microscopy and X-ray diffraction patterns are composed of lines that could be indexed within the cubic spinel structure. The room temperature Mössbauer spectrum shows the coexistence of the broad magnetically split part and superparamagnetic doublet. The in-field Mössbauer measurements carried out in the temperature range from room temperature down to 13 K show a gradual increase in the spin canting on the surface of the nanoparticles and decrease in the intensity of the superparamagnetic doublet. The sample was subjected to annealing process performed at elevated temperature in air atmosphere in order to change the microstructure of the nanoparticles and in consequence to change the magnetic properties of the sample. The annealing process leads to the decrease in the value of quadrupole splitting of the superparamagnetic doublets.
7
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Hyperfine Interactions of ^{57}Fe in Pt_3Fe - Ab Initio and Mössbauer Effect Studies

76%
Deniszczyk J., Satuła D., Waliszewski J., Rećko K., Olszewski W., Parzych G., Szymański K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
197-199
EN
The Mössbauer effect and ab initio investigations of an electric field gradient at ^{57}Fe nuclei in Pt_3Fe compound are presented. It is shown that nonzero ^{57}Fe electric field gradient exists in the cubic Pt_3Fe. Ab initio study of Pt_3Fe in antiferromagnetic state confirms the presence of electric field gradient at ^{57}Fe nuclei. Lattice, local valence electron (3d, 4p) and weakly bound 3p core electron contributions to electric field gradient are separated out and discussed in the context of the electronic structure changes upon the antiferromagnetic phase transition.
8
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Effect of Annealing in Multicomponent bcc Alloys

64%
Szymański K., Perzyńska K., Satuła D., Dobrzyński L., Zaleski P., Waliszewski J., Rećko K., Biernacka M., Olszewski W.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
62-64
EN
Multicomponent single phase alloys were synthesized according to the idea of iron-average atom system. X-ray diffraction shows formation of bcc phase and traces of unidentified phase. Mössbauer spectra indicate presence of two components with different hyperfine magnetic field distributions. The high field component corresponds to the majority ferromagnetic phase. Few per cent of iron builds low field component. The dominant effect of annealing consists in an increase of the low field component.
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