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Wyszukujesz frazę "Ilczuk, A." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Mössbauer Spectroscopy, X-Ray Diffraction and SEM Studies on Multiferroic $Bi_5Ti_3FeO_{15}$ Ceramics
Autorzy:
Rymarczyk, J.
Hanc, A.
Dercz, G.
Ilczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811595.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.Qr
81.05.Je
68.37.Hk
61.05.cp
77.84.-s
Opis:
Magnetoelectric multiferroics are materials which exhibit both magnetic order and ferroelectricity in the same phase. Multiferroic materials, where ferroelectricity and magnetism coexist, were extensively studied. This class of materials offers a large application potential for new devices due to the two coupled degrees of freedom based on the local off-centered distortion and the electron spin. The studied $Bi_5Ti_3FeO_{15}$ ceramics was prepared by conventional synthesis and hot uniaxial pressing reaction applying the conventional mixture of $TiO_2$, $Fe_2O_3$ and $Bi_2O_3$ oxides as precursor materials. The present work focuses on the structure analysis of multiferroic $Bi_5Ti_3FeO_{15}$ ceramics performed by X-ray diffraction method, scanning electron microscopy and the Mössbauer spectroscopy methods.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1579-1584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Photoexcited Carriers in GaInAs/GaAs Quantum Dots
Autorzy:
Ilczuk, E.
Korona, K. P.
Babiński, A.
Kuhl, J.
Powiązania:
https://bibliotekanauki.pl/articles/2028722.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
78.47.+p
78.67.-n
Opis:
We present photocurrent and time-resolved photoluminescence investigations of AlGaAs/GaInAs/GaAs structures containing GaInAs/GaAs self-assembled quantum dots. The high electrical field in those devices significantly influences carrier dynamics. The photocurrent spectra show a double peak with maxima at 1.40 and 1.47 eV (at 80 K). These maxima are due to the GaInAs wetting layer (higher) and the quantum dots (lower). The photoluminescence spectra comprise weak excitonic luminescence from GaAs at 1.504 eV (at 80 K) and stronger and broad emission from the Ga$\text{}_{0.4}$In$\text{}_{0.6}$As quantum dots. At 300 K, the quantum dots emission has a lifetime of 1.1 ns and has a maximum at an energy of 1.38 eV. By analysis of both experiments, we can separate the influence of different radiative and nonradiative recombination processes. So, the tunneling rate: r$\text{}_{T}$=0.5 ns$\text{}^{-1}$ and the radiative recombination rate in the quantum dots: r$\text{}_{RQD}$=0.4 ns$\text{}^{-1}$ have been determined. The high tunneling probability (due to the influence of the built-in electric field) reveals that the tunneling effect is important for the recombination and transport processes in our structures.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 379-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Studies with the Use of XRD and Mössbauer Spectroscopy οf $Bi_5Ti_3FeO_{15}$ Ceramic Powders Obtained by Mechanical Synthesis
Autorzy:
Dercz, G.
Rymarczyk, J.
Hanc, A.
Prusik, K.
Babilas, R.
Pająk, L.
Ilczuk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811608.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.Qr
61.05.C-
61.05.J-
81.07.Bc
81.20.Wk
Opis:
In this paper the structural and Mössbauer spectral properties of multiferroic ceramic $Bi_5Ti_3FeO_{15}$ powders prepared by high-energy ball milling of polycrystalline precursor material (mixture of $Bi_2O_3$, $TiO_2$ and $Fe_2O_3$ powders) are presented. Mechanical synthesis was performed by high-energy vibratory mill. The X-ray diffraction methods were applied for the structure characterization of the studied samples. The parameters of diffraction line profiles were determined by PRO-FIT Toraya procedure. The crystallite sizes and lattice distortions were analyzed using the Williamson-Hall method. Investigations of hyperfine interactions in the studied materials were carried out by the Mössbauer spectroscopy. The powder morphology was analyzed by scanning electron microscopy and transmission electron microscopy techniques. It was found that during high-energy milling phase transitions, a decrease in crystallite size and amorphization process are observed.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1623-1629
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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