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EMR study and superposition model analysis of Cr3+and Fe3+impurity ions in mullite powders used in aerospace industry

100%
Stefaniuk I., Rogalska I.
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issue 3
399-403
EN
In this work, the electron magnetic resonance (EMR) spectra of the mullites powders were measured for different grain sizes (0.07 and 0.12 mm). We have used EMR spectroscopy at X-band, combined with superposition model (SPM) calculations to reveal electronic structure and establish correlations between structure, and surroundings of these complexes.
2
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Dyson line and modified Dyson line in the EPR measurements

81%
Popovych V., Bester M., Stefaniuk I., Kuzma M.
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issue 3
385-388
EN
The difficulty in determining the electron paramagnetic resonance (EPR) line parameters of ferromagnetic semiconductors has been addressed. For these materials, the resonance line is very broad and lies at low resonance field, so that only a part of the line can be detected experimentally. Moreover, the line is of asymmetric (Dysonian) shape as described by the line shape parameter α. We have compared values of line parameters derived by computer fitting of the whole experimental EPR line to the Dyson function (or modified Dyson function) with the values obtained by applying this procedure to the left and the right half of the line.
3
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Magnetic transformation in Ni-Mn-In Heusler alloy

81%
Kuzma M., Maziarz W., Stefaniuk I.
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issue 3
435-438
EN
Magnetic properties of a Ni50Mn35.5In14.5 Heusler ribbon were studied by ferromagnetic resonance (FMR) in the temperature range of 335–100 K. In the temperature region of 265–170 K, the FMR signal disappeared, in spite of the fact that this region comprised the main crystal transformation temperatures: Ms, Mf, As, Af. In the austenite crystal state, a weak antiferromagnetic interaction was observed, whereas ferromagnetism was detected in the low temperature martensitic state.
4
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Symmetry of the pentacene molecule and classification of electron states studied in the frame of group action on a set

81%
Potera P., Stefaniuk I., Kuźma M.
Open Physics
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2007
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vol. 5
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issue 2
165-176
EN
Pentacene have recently become the subject of intense studies due to their physical properties which follow from the states of their outer-shell electrons that are able to take part in molecule bonding. The symmetry of these molecules provides the classification of quantum states according to the group theory method. In this paper, we apply a molecular state-space factorization scheme for the classification of pentacene molecules based on the structure of their electron states.
5
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Optical absorption and reflectivity spectra of highly chromium doped CdTe alloy and layer

71%
Potera P., Stefaniuk I., Kuzma M., Virt I., Pukowska B.
Open Physics
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2009
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vol. 7
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issue 2
299-303
EN
In the present work, a CdTe alloy doped with a relatively high concentration of chromium (1%), and a CdTe:Cr layer, have been studied. Absorption and reflectivity spectra were measured at room temperature. They indicate the presence of chromium in the divalent state, both in the alloy and in the layer.
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