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    Wyświetlanie 1-15 z 15
    Tytuł:
    Influence of annealing and irradiation by heavy ions on optical absorption of doped lithium niobate crystals
    Autorzy:
    Potera, P.
    Stefaniuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075585.pdf
    Data publikacji:
    2016-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Gh
    61.80.-x
    78.20.-e
    Opis:
    The present work is devoted to investigation of optical absorption changes in Fe and Cu doped LiNbO₃ (LNO) single crystals induced during annealing in vacuum and air as well as under influence of the ²⁰⁹Bi ions irradiation with energy 11.4 MeV/u (MeV per nucleon) and a fluence 5×10¹¹ cm¯² at room temperature. The analysis of changes of absorption of the crystal during air annealing have been studied in the Arrhenius coordinates and activation energies have been determined.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 3; 800-804
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMR study and superposition model analysis of Cr3+ and Fe3+ impurity ions in mullite powders used in aerospace industry
    Autorzy:
    Stefaniuk, I.
    Rogalska, I..
    Powiązania:
    https://bibliotekanauki.pl/articles/146307.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron magnetic resonance (EMR)
    mullites
    spin Hamiltonian (SH)
    superposition model (SPM)
    Opis:
    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.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 399-403
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer program superposition model - Monte Carlo (SPM-MC) and its applications in EMR studies of transition ions at low symmetry sites Fe3+ doped YAP crystals
    Autorzy:
    Stefaniuk, I.
    Rudowicz, Cz.
    Powiązania:
    https://bibliotekanauki.pl/articles/146564.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    superposition model (SPM)
    spin Hamiltonian (SH)
    yttrium aluminum perovskite (YAP)
    YAlO3
    Opis:
    An extension of the computer program superposition model-Monte Carlo (SPM-MC), designed for modelling of the spectroscopic and structural properties of transition ions at low symmetry sites in crystals, is presented. Special focus is put on two aspects. The first aspect concerns the effects of variation of the superposition model (SPM) parameters, i.e. the intrinsic parameters (b2, b4) and power low exponents (t2, t4), on the quality of fittings of experimental data and theoretical predictions. This enables to increase the reliability of the modelling results. The second aspect concerns the implications of low site symmetry on modelling of the pertinent properties. Applications of the program SPM-MC to Fe3+ ions at the triclinic (Ci) symmetry sites in YAlO3 (YAP) crystals are considered.
    Źródło:
    Nukleonika; 2013, 58, 3; 397-400
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study of ZnO:Co thin films grown by the PLD method
    Autorzy:
    Cieniek, B.
    Stefaniuk, I.
    Virt, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146744.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron paramagnetic resonance (EPR)
    diluted magnetic semiconductor (DMS)
    ZnO:Co
    Curie temperature
    Opis:
    We have studied magnetic properties of zinc-oxide composite doped with a relatively high concentration (4%) of Co ions. Samples were obtained by the pulsed laser deposition (PLD) method with different parameters of the laser ablation. For various samples, the power of laser was changed as well as the temperature of sample heating. Electron paramagnetic resonance (EPR) measurements were carried out and temperature dependence of the EPR spectra was obtained. Analysis of the temperature dependences of the integral intensity of EPR spectra was carried out using the Curie-Weiss law. Fitting yields the following values θCW = 150 K and C = 1.6710, where C is the Curie constant, and θCW is the paramagnetic Curie temperature.
    Źródło:
    Nukleonika; 2013, 58, 3; 359-363
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy of g_{eff} Factor for Ni_{50}Mn_{35.5}In_{14.5} Heusler Alloy
    Autorzy:
    Dubiel, Ł.
    Wal, A.
    Stefaniuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398339.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    75.20.En
    32.10.Fn
    Opis:
    In this work electron magnetic resonance (EMR) spectra of off-stoichiometric $Ni_{50}Mn_{35.5}In_{14.5}$ Heusler alloy ribbons obtained by melt-spinning method were measured. The EMR measurements were performed on the X-band (9.36 GHz) spectrometer. Angle dependences were registered for three orientations of sample, with the use of uniaxial goniometer at 300. The results exhibited magnetic anisotropy and were used for calculating the principal values of g tensor.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 91-93
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quasi-Two-Dimensional Ferromagnetism in Cr₂Te₃ and Cr₅Te₈ Crystals
    Autorzy:
    Bester, M.
    Stefaniuk, I.
    Kuzma, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386445.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    75.50.Cc
    Opis:
    The crystal structure of CrTe suggests two-dimensional magnetism in the plane perpendicular to the c axis. It is consistent with the temperature dependence of the g factor and EPR lines width observed. In the present paper we investigate the CrTe alloy which has been prepared by melting of the powdered Cr₂Te₃ in evacuated quartz ampoule at the temperature 1600 K. ESR spectra were recorded using X-band (9.4 GHz) spectrometer provided with gas nitrogen cryostat. The shape of the EPR line depends strongly on the temperature. In the vicinity of the room temperature the lines become very wide and weak or disappear completely. At lower temperatures the shape of the lines approaches the Dyson function. The asymmetry of lines is attributed to the strong exchange interactions as well as to the semimetal electrical conductivity. Above the room temperature the shape of spectra is characteristic for the paramagnetic phase. Results were addressed based on the model of critical spin fluctuations in two-dimensional Heisenberg magnet proposed by Eremin et al.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 433-435
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMR Spectra Thin Films Doped with High Concentration of Co and Cr on Quartz and Sapphire Substrates
    Autorzy:
    Cieniek, B.
    Stefaniuk, I.
    Virt, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030218.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.bg
    75.30.Gw
    76.30.-v
    Opis:
    We have studied magnetic properties of zinc-oxide composite doped with high concentration (up to 20%) of Co and Cr ions. The pulsed laser deposition method was used to obtain samples on quartz glass and sapphire substrates. Samples were annealed at 100-250°C for ZnO on quartz substrate, and 300-700°C on sapphire substrate. EMR measurements were carried out and temperature dependence of the EMR spectra was obtained. The angular dependence in two samples orientation, vertical and horizontal, were also obtained. Analysis of the temperature dependences of the integral intensity of EMR spectra was carried out using the Curie-Weiss law.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 30-34
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic transformation in Ni-Mn-In Heusler alloy
    Autorzy:
    Kuzma, M.
    Maziarz, W
    Stefaniuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146235.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ferromagnetic resonance
    Heusler alloy
    Ni-Mn-In
    Opis:
    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.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 435-438
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR measurements of ceramic cores used in the aircraft industry
    Autorzy:
    Stefaniuk, I.
    Rogalska, I..
    Potera, P.
    Wróbel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/148814.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Al2O3
    electron paramagnetic resonance (EPR)
    mullite
    nanopowders
    Opis:
    In this work the electron paramagnetic resonance (EPR) spectra of Al2O3 and ZrO2 powders were measured for different size of grains (0.074, 0.044 mm) as well as the mullites (0.07 and 0.12 mm). Also were investigated the ceramic cores. The measurements were performed at room temperature and in the temperature range from 140 up to 380 K. The main purpose of this work was to investigate the possible relationships between the EPR spectra and the size of powder grains as well as the identification of EPR spectra in view of the potential application of EPR technique as a fingerprinting method.
    Źródło:
    Nukleonika; 2013, 58, 3; 391-395
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antioxidant properties of wines produced in the Podkarpacie region
    Autorzy:
    Szterk, A.
    Stefaniuk, I.
    Cieniek, B.
    Kuźma, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147112.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron spin resonance (ESR)
    POBN spin trap
    superoxide radial anion
    Polish wines
    Opis:
    The wine is famous and popular drink having properties of reactive oxygen species scavenging. In this paper we study the antioxidant activity of the selected wines produced in the south-east region of Poland, in Subcarpathian Voivodeship, in the Podkarpacie region. We have concentrated our studies on the superoxide radical anion O2 •–. We have used electron spin resonance spectroscopy (ESR) as it is the best method for radical detection. The nitrone spin trap α-(4-pyridyl-1-oxide)-N-tert-butylnitrone (POBN) has been used in the experiment. The radical scavenging ability of wines were determined from the changing intensity of the spectrum in time.
    Źródło:
    Nukleonika; 2013, 58, 3; 447-450
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of the ESR spectra intesity of POBN : O2 adduct on the concentrtions components in non-fenton reaction
    Zależność intensywności widma ESR adduktu POBN : O2 od stężeń składników reakcji niefentonowskiej
    Autorzy:
    Stefaniuk, I.
    Cieniek, B.
    Szterk, A.
    Kuźma, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/407912.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    nie Fentonowskie generowanie rodnika O2
    non-Fenton generation of O2
    ESR spectra of POBN : O2
    Opis:
    In the paper the trapping of the O2 radical by the nitrone a-(4-pyridyl1-oxide)-N-tert-butylnitrone (POBN) compound was investigated. The O2 radicals were generated by the nonFenton reaction of water solutions of KOH and H2O2 reagents. The ESR spectrum of POBN : O2 adduct can be recorded under carefully selected concentration of components. The best spectra were obtained for 6% KOH and 6% H2O2.
    W pracy badano pułapkowanie rodnika O2 przez a-(4-pyridyl-1-oxide)-N-tert-butylnitrone (POBN). Rodnik O2 generowano w reakcji niefentonowskiej z KOH i H2O2. Widmo ESR adduktu POBN : O2 powstaje po starannym dobraniu stężeń substratów. Najlepsze widmo otrzymuje się dla stężeń 6% KOH i 6% H202.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2012, 2; 34-36
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dyson line and modified Dyson line in the EPR measurements
    Autorzy:
    Popovych, V.
    Bester, M.
    Stefaniuk, I.
    Kuzma, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148008.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR
    FMR
    Dyson line
    CdCrTe
    Opis:
    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 fi eld, 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 fi tting 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.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 385-388
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR Spectra of Cr in CdTe Crystals
    Autorzy:
    Stefaniuk, I.
    Bester, M.
    Virt, I. S.
    Kuzma, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043654.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Cr
    Opis:
    The EPR studies of CdTe:Cr were performed on X-band (9.6 GHz) spectrometer at room temperature. Single CdTe crystals were doped by chromium Cr in the synthesis process. The spectra observed were resolved into two spectra. The first one consisted of very broad line (Δ B=100 mT) and the second one showed a typical fine structure. The complete angular dependence measurements were obtained. The fine structure of Cr$\text{}^{2+}$ or Cr$\text{}^{3+}$ ions was assumed and simulated. It follows from the theoretical analysis of the obtained spectra that degree of ionization of the chromium Cr dopant is 3+.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 413-418
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic Resonance in CdTe:Cr Single Crystals Containing Dopant-Related Macrodefects
    Autorzy:
    Popovych, V.D.
    Kuzma, M.
    Skop, N.
    Stefaniuk, I.
    Cieniek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030219.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.-y
    68.37.Hk
    76.50.+g
    Opis:
    We study CdTe:Cr single crystals grown by the physical vapor transport method from pre-synthesized (Cd,Cr)Te alloys with 5 at.% of chromium nominal content. Macrodefects in the form of (111)-oriented thin platelets of dopant-related second phases were detected by scanning electron microscopy patterning of the chemically treated surfaces of the crystals. Magnetic properties of the crystals were investigated by ferromagnetic resonance using X-band Bruker spectrometer (9.43 GHz). Their ferromagnetic resonance spectra show several broad lines, which position depends on the orientation of the sample in relation to the external magnetic field in spectrometer. The angular dependences of ferromagnetic resonance spectra are interpreted in the frame of shape anisotropy of ferromagnetic resonance of the planar defects embedded in a weak magnetic CdTe matrix.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 34-38
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron paramagnetic resonance studies of manganese and cobalt ions in YAlO3 crystals
    Autorzy:
    Stefaniuk, I.
    Rogalska, I
    Suchocki, A
    Berkowski, M.
    Cieniek, B.
    Potera, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/174068.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    electron paramagnetic resonance (EPR)
    spin Hamiltonian
    Mn2+
    Mn4+
    Co2+
    Fe3+
    Cr3+
    Nd3+ and Er3+ ions
    YAlO3 (YAP) crystals
    Opis:
    The results of X-band electron paramagnetic resonance measurements of Mn2+ and Mn4+ ions in YAlO3 (YAP) crystals in the temperature range 100–300 K are presented. Additionally, we observe electron paramagnetic resonance spectra of unintentional impurities Fe3+ and Cr3+ in YAP crystals. The angular dependence for Mn ions in YAP crystals can be presented. We aim at obtaining a better insight into the spectroscopic properties of paramagnetic Mn centers and structural information about their nearest environment in YAP host and at determining the valence of manganese ion. In this paper we compare electron paramagnetic resonance spectra for Co and Mn ions in YAP crystals.
    Źródło:
    Optica Applicata; 2014, 44, 1; 113-121
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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