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1
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Reconstruction of the Exchange Integrals Map of ScFe₄Al₈ Magnetic Structure

100%
Rećko K., Dobrzyński L., Waliszewski J., Szymański K.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
424-426
EN
The influence of the dipolar as well as crystal field interaction as the main reasons of the noncollinearity and incommensurability of the 3d-3d-3p alloy belonging to ThMn₁₂ family is investigated. Available data on the single crystal neutron scattering experiments for ScFe₄Al₈ compound are discussed. The values and directions of the spin ordering found by magnetic diffraction are compared to that one derived from ground state configurations obtained by a simulated annealing algorithm.
2
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The Magnetic Properties of GaFeO_3 by Neutron Diffraction and Mössbauer Spectroscopy

100%
Rećko K., Szymański K., Dobrzyński L., Waliszewski J.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
396-399
EN
The multiferroic GaFeO_3 synthesized by a sol-gel method and conventional solid state reaction show remarkably different magnetic transition temperatures. Both samples have orthorhombic crystal structure Pc2_1n. Results of a new analysis of neutron diffraction and Mössbauer data are presented. Full agreement between parameters was achieved using the Mössbauer data as the constraints in the refinement of neutron diffraction data at low and at high temperature. Magnetic moments are reported.
3
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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.
4
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On the Crystal and Magnetic Behavior οf ScFe_{4}Al_{8} Single Crystal

76%
Rećko K., Dobrzyński L., Lemée-Cailleau M., Waliszewski J., Talik E., Suski W., Courtois P.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
206-208
EN
Nuclear and magnetic properties of the ScFe_{4}Al_{8} single crystal were found to exhibit unparalleled complexity of nuclear and magnetic structures. Our previous neutron measurements revealed presence of two modulation vectors, both along [ε, ε, 0], however with different critical temperatures. Recent experiments forced us to revise our knowledge of the structural ordering in the sample. So far, the crystal structure of this alloy, being of ThMn_{12}-type, has never been questioned.
5
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Electrical and Magnetic Properties of Selected Fe-Based High Entropy Alloys

64%
Perzyńska K., Go A., Szymański K., Biernacka M., Hawełek Ł., Kalska-Szostko B., Oleszak D., Rećko K., Waliszewski J., Zaleski P.
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vol. 126
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issue 4
999-1004
EN
The electrical and magnetic properties of Fe_{0.5}A_{0.5} alloys are presented, where the A corresponds to various compositions of the elements: A = (Al, Si, V, Cr, Co, Ga, Ni, Ge). The system is closely related to the known family of high entropy alloys. The samples were synthesized by arc melting and/or melt spinning technique and exhibit a regular type of crystal structure. Lattice parameters are systematically smaller than the estimates based on metallic radiuses of the elements. Temperature dependences of resistivities show maxima for some compositions. This behavior is consistent with results of electronic structure calculations, where a low density of states at the Fermi level were predicted. Also the measured magnetic moments are in good agreement with results of calculations. It is thus presented that some physical properties can be designed by appropriate choice of the chemical composition within the same simple structure.
6
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Investigation of Electronic Structure of Zn_{1-x}Mg_{x} Mixed Crystals by Compton Spectroscopy Method

64%
Reniewicz H., Andrejczuk A., Dobrzyński L., Rećko K., Waliszewski J., Żukowski E., Firszt F., Łęgowski S., Meczyńska H., Szatkowski J.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
907-910
EN
The first experimental study of the Compton profiles of Zn_{1-x}Mg_{x}Se for x=0.25, 0.47, 0.56 mixed crystals is presented. The Compton profiles were measured with the use of the ^{241}Am radioactive source with a resolution of 0.57 a.u. The experimentally obtained Compton profiles were compared with the theoretical ones based on the free-atom model. The results are interpreted in terms of outermost electrons of Zn and Mg being promoted to the higher momentum states, and 4p-electrons of Se becoming more delocalised in a solid, being thus promoted to the lower momentum states.
7
Content available remote

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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