Autor: Cieniek, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

Tytuł:: Analysis of chemical and phase composition of copper oxide prepared by direct current sputtering for photovoltaic applications
Autorzy:: Sawicka-Chudy, P.
Wielgosz, M.
Wal, A.
Cieniek, B.
Wisz, G.
Głowa, Ł.
Cholewa, M.
Sawicka, J.
Powiązania:: https://bibliotekanauki.pl/articles/101735.pdf
Data publikacji:: 2018
Wydawca:: Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Tematy:: XRF
XRD
copper oxide
photovoltaics
Opis:: This paper presents the application of X-ray fluorescence and X-ray diffraction methods for the study of copper oxide structures as an absorber layer in thin-film solar cells. The layers of copper oxide were applied by direct current magnetron sputtering. Quantitative and qualitative analysis of oxide layers were performed using XRF (X-ray fluorescence). The studies showed a high copper content in both samples, amounting to 98% and 96%, as well as trace amounts of other elements (nickel, lead). The XRD (X-ray diffraction) study showed Cu₂0 and Cu₈O phases, amorphism ranging from 24% to 44%, and crystallinity from 55% to 75%. Crystallites of 30 nm were also determined. The aim of the study was to determine the chemical and phase composition of the layers obtained and to determine the degree of their contamination depending on the parameters of the manufacturing technology in terms of their application in photovoltaics. One of the samples showed an advantage both in terms of material and structural composition.
Źródło:: Energy Policy Studies; 2018, 1 (2); 3-11
2545-0859
Pojawia się w:: Energy Policy Studies
Dostawca treści:: Biblioteka Nauki

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