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Brownian Movement of Inorganic Nanoparticles in Sediments

100%
Fornal P., Stanek J.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
12-14
EN
The 100 nm particles of Fe_{2}O_{3} and metallic Fe sedimented jointly with Al_{2}O_{3} powder from their suspension in oleic acid exhibit distinguished mobility which depends on the concentration of aluminum oxide. This observation is interpreted as the result of the interparticle Fe-Fe magnetic interactions which lead to the formation of the rigid network of magnetic metallic iron nanoparticles.
2
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Mobility of Hematite Submicron Particles in Water Solutions of Sugar

100%
Fornal P., Stanek J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1667-1673
EN
The mobility of the 100 nm Fe_2O_3 particles in dense water solutions of sugar (sucrose) was determined from the analysis of the resonance absorption line shape of the Mössbauer spectra recorded in the -5°C to 40°C temperature range for different sugar concentrations. The discrepancy between the experimental data and the prediction of the classical theory of Brownian movement are interpreted in the term of the short observation time and the interaction between the solid particles in fluids, which extends in water up to 300 nm. The sedimentation process in the studied colloids was observed.
3
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Local States of Tellurium in Isolated Helical Chains

81%
Stanek J., Fornal P., Hafner S., Pfitzner A.
Acta Physica Polonica A
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2001
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vol. 100
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issue 5
807-815
EN
The local electronic state of Te in the helical chains of CuXY_{2(1-x)}Te_{2x} (X = Cl, Br; Y = Se, S) were studied using the Mössbauer spectroscopy of ^{125}Te at 10 K and 70 K. The isolated chains of Te in these compounds are less rigid than those in elemental Te. The determined data of quadrupole splittingΔ and Debye temperatureΘ_D are indicative of strong local ordering of Te in one of the two non-equivalent crystallographic positions. It was not possible to resolve crystallographic positions by the Mössbauer spectroscopy.
4
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Microstructure and Dynamics of Magnetic Iron Nanoparticles Aggregates in Protein Gels

81%
Konik K., Fornal P., Okła D., Stanek J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
457-463
EN
The 60 nm metallic iron nanoparticles and its aggregates in gelatine gel were studied by means of optical microscopy, X-ray microtomography, atomic force scanning microscopy and the Mössbauer spectroscopy. The isolated nanoparticles in gel exhibit fast bounded diffusion described by Brownian movement. In the external magnetic field these magnetic particles form spectacular linear aggregates whose local dynamical and magnetic properties were determined from the Mössbauer spectra.
5
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Magnetoelastic Phase Transitions and Critical Behaviour of (Fe_{1-x}Ni_{x})_{2}P System

52%
Średniawa B., Duraj R., Pacyna A., Bombik A., Zach R., Bacmann M., Fruchart D., Nizioł S., Fornal P., Stanek J.
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EN
This report focuses on magnetoelastic properties and critical behaviour of (Fe_{1-x}Ni_{x})_{2}P system. For low Ni content (x=0.01) an isolated critical point was found. Analysis of this critical behaviour in the frame of molecular field approximation was carried out. Moreover, thermal variations of the lattice parameters, as measured by X-ray diffraction techniques, were studied. The (P,T) phase diagrams obtained for several Ni contents show the evidence that the Curie temperature decreases with pressure. The Mössbauer spectra collected for x = 0.025, 0.1, 0.2, 0.25 at different temperatures are also analysed. The existence of two nonequivalent crystallographic sites occupied by iron atoms as well as local magnetic structure is discussed.
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