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Wyszukujesz frazę "Michalik, J." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Influence of Ball Milling on the Local Atomic Structure of an Amorphous CoFeSiB Alloy
    Autorzy:
    Bednarcik, J.
    Michalik, S.
    Kollar, P.
    Roth, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534068.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    61.05.cp
    64.70.dg
    75.30.Kz
    Opis:
    It follows from experimental observations that ball milling induces substantial changes in an amorphous $Co_{70.3}Fe_{4.7}Si_{10}B_{15}$ (at.%) alloy. X-ray diffraction indicates formation of nanocrystalline bcc-(Co,Fe) phase during ball milling. As a consequence crystallization sequence is altered and the total enthalpy of crystallization reduces with the milling time. Furthermore thermomagnetic measurements reveal that specific magnetization and Curie temperature of amorphous phase are influenced by ball milling.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 825-826
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlling Structural and Functional Features of Photosynthetic Antenna
    Autorzy:
    Fiedor, L.
    Fiedor, J.
    Pilch, M.
    Susz, A.
    Tworzydło, J.
    Michalik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419488.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.15.nr
    87.15.Cc
    87.64.ks
    Opis:
    In order to gain control over the assembly and functioning of photosynthetic antenna, we have developed methods to manipulate pigment composition of bacterial LH1 complexes via their reconstitution with modified bacteriochlorophylls or carotenoids, major photoactive cofactors of these antennae. In the present work we show how the reconstitution and pigment exchange approach is applied to control structural and functional parameters of LH1 and its subunits. The size of the subunits and the energy of the first excited singlet state can be controlled via the use of detergent while the thermodynamics of LH1 formation can be modified using carotenoids and/or a co-solvent. Carotenoids affect the efficiency of the intracomplex energy transfer, while the replacement of native bacteriochlorophyll a with its Ni-substituted analog allows one to control the excited state properties of LH1. These results show that LH1 is a very promising model system applicable for the design of bio-inspired device performing solar energy conversion.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 255-258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Heavy-Ions on Soft-Magnetic Metallic Glasses Studied by Diffraction of Synchrotron Radiation
    Autorzy:
    Michalik, S.
    Pavlovic, M.
    Gamcova, J.
    Sovak, P.
    Miglierini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032682.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.50.Lk
    61.43.Dq
    Opis:
    In this work, influence of ²³⁸U swift (5.9 MeV/u) heavy ions on the as-prepared Fe-Cu-Nb-Si-B metallic glass was investigated by in situ temperature X-ray diffraction of synchrotron radiation. It was observed that ion irradiation strongly affected the temperature evolution of the parameters of the first diffuse peak. It is hypothesized that ion irradiation induced structural rearrangement that increased the degree of disorder of the amorphous structure. During heat treatment, structural relaxation and annealing out of this ion-induced degradation took place. Consequently, the original structure was recovered as demonstrated by the behaviour of the first diffuse peak broadening and devitrification process.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 657-659
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Study of Fe-Si(Ge)-Nb-Cu-B Finemet Alloys
    Autorzy:
    Michalik, S.
    Bednarcik, J.
    Brzózka, K.
    Sovak, P.
    Górka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534048.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.C-
    61.46.Hk
    Opis:
    Structural changes in Finemet based alloys invoked by germanium replacement for silicon were investigated using the X-ray diffraction, the X-ray absorption spectroscopy and the Mössbauer spectroscopy. Ge substitution preserves a nanostructural character of annealed samples at temperature 550°C; specifically the formation of a $DO_3$-type with about 19 at.% of (Si,Ge) was confirmed. The mean size of nanocrystals was estimated to be about 7 nm.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 818-819
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Structural Stability of Soft Magnetic Fe-Co-Zr-W-B Metallic Glasses Investigated by the in-situ X-ray Diffraction
    Autorzy:
    Michalik, S.
    Bednarcik, J.
    Pawlik, P.
    Matija, R.
    Sovak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366893.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.43.Dq
    Opis:
    The atomic structure of as-prepared $Fe_{61}Co_{(14-x)}Zr_{5}W_{x}B_{20}$ (x=1, 2 and 4) ribbon samples and their thermal stability were investigated by in-situ high-energy X-ray diffraction experiments. It was observed that higher W concentration causes the tiny shift of the main peak of the reduced atomic pair distribution function to higher values of interatomic distances and increases the coefficient of volume thermal expansion. The crystallization process occurs in two steps and is qualitatively the same for all studied specimens. Firstly the $Fe_{23}B_{6}$ phase is created and later is transformed to other types of borides together with the creation of a Fe-based phase.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 66-67
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Magnetic Properties οf Fe(Mn)-Si-B-Nb-Cu Alloys
    Autorzy:
    Michalik, S.
    Sovak, P.
    Bednarcik, J.
    Kollar, P.
    Girman, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810612.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.50.Tt
    77.80.Bh
    Opis:
    According to high energy X-ray diffraction measurements no significant changes were observed in a short range atomic order of amorphous ribbons $Fe_{73.5-x}Mn_xCu_1Nb_3Si_{13.5}B_9$ (x=1 up to 15 at.%). Thermal stability of the as-prepared alloys was investigated by differential scanning calorimetry and by in situ X-ray diffraction measurements. The two-step crystallization process was revealed, crystallization temperatures $T_{x1}$ and $T_{x2}$ were influenced by Mn content (thermal separation between $T_{x1}$ and $T_{x2}$ completely vanished for x=9). Nanocrystalline state of annealed samples was confirmed by electron transmission microscopy. The influence of Mn substitution on magnetic properties was confirmed by thermomagnetic measurements.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 399-402
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Zn on Structure and Magnetic Properties of Rapid Quenched (Fe-Zn)-Cu-Nb-Si-B Alloys
    Autorzy:
    Kolesar, V.
    Michalik, S.
    Kovac, J.
    Girman, V.
    Sovak, P.
    Kollar, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1533958.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Hk
    75.50.Bb
    75.75.Cd
    Opis:
    The aim of this work was to study the influence of Zn on the formation of nanostructure in $Fe_{73.5 - x}Zn_xCu_1Nb_3Si_{13.5}B_9$ (x = 1, 3, 5) ribbons prepared by the melt-spinning technique. X-ray diffraction measurements proved amorphous state of the sample with x = 1. The sample with x = 3 contains a small fraction of Fe_3Si phase and the sample with x = 5 is in nanocrystalline state with the average grain size of about 25 nm. The reduced radial distribution function G(r) was calculated for local structure investigation. Increasing Zn content enhances crystallization during solidification which leads to increase of magnetocrystalline anisotropy and consequently to increase of coercivity.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 790-791
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Annealing Time on Structure of $Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7}$ Alloy
    Autorzy:
    Nemcová, V.
    Girman, V.
    Hrabčáková, V.
    Michalik, Š.
    Bednarčík, J.
    Almáši, M.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367403.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.46.Hk
    61.05.J-
    Opis:
    The process of a primary crystallization of the $Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7}$ alloys was investigated by differential thermal analysis (DTA), x-ray diffraction (XRD) and transmission electron microscopy (TEM). Amorphous ribbons were isothermally annealed for 0.5, 2, 6, 30 and 150 minutes at 520 °C. Both, the XRD and TEM study showed that the level of devitrification of the sample increases with the annealing time. The above mentioned techniques confirmed the presence of the nanocrystalline grains of the $Fe_{3}Si$ phase and enable us to study the evolution of the identified phase.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 116-117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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