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    Wyświetlanie 1-6 z 6
    Tytuł:
    Simulation study of topological point defects in graphitic layer - curvature effect and pair correlation function analysis
    Autorzy:
    Hawelek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075560.pdf
    Data publikacji:
    2016-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.ue
    61.72.J-
    61.43.Bn
    61.66.Fn
    61.05.C-
    Opis:
    The effect of three types of topological defects, single vacancy, double vacancy and the Stone-Thrower-Wales defect on the atomic arrangement in a single graphitic layer is studied using computer simulations. The topological defects were positioned on the perfect hexagonal graphitic layer 20 Å in diameter with different distance from the layer edge and then the geometry of the system was independently optimized using the reactive bond order potential, the semi-empirical quantum-chemical PM7 and the density functional theory method. Curvature and the distortion of the graphitic layer caused by the defects are analyzed and their influence on the pair correlation function is discussed.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 3; 811-816
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Fe addition on the martensitic transformation, structure and magnetic properties of metamagnetic Ni-Co-Mn-Sn alloys
    Autorzy:
    Wójcik, A.
    Maziarz, W.
    Szczerba, M.
    Sikora, M.
    Hawełek, Ł.
    Czaja, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1154400.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    81.30.Kf
    Opis:
    In this study the effect of Fe for Ni substitution in Ni₄₄Co₆Mn₃₉Sn₁₁ metamagnetic shape memory alloys on their structure, magneto-structural transformation characteristics, magnetic and magnetocaloric properties was studied. The results show that the structure and martensite transformation behavior strongly depends on the Fe concentration. The martensitic transformation temperature decreases with 1 at.% of Fe and is suppressed with higher Fe content. It was further found that substitution of Fe for Ni leads to lowering of the value of magnetic entropy change.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 1026-1028
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Angular Distribution of N-Doped Carbon Nanotubes in Alumina Membrane Channels: A High-Energy X-ray Diffraction Study
    Autorzy:
    Hawelek, L.
    Brodka, A.
    Dore, J.
    Honkimäki, V.
    Kyotani, T.
    Yang, Q.
    Burian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538877.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.48.De
    Opis:
    An alignment study of multi-wall N-doped carbon nanotubes prepared by a template pyrolytic carbon deposition method inside channels of an alumina membrane has been performed using high-energy X-ray diffraction on the ID15B beamline at the European Synchrotron Radiation Facility (ESRF, Grenoble). The two-dimensional diffraction pattern of the deposited carbon nanotubes, recorded directly, within the alumina membrane, using an image plate detector, exhibits two non-continuous arcs corresponding to the 002 graphitic reflection. The following values of the angle between the axis of the carbon nanotubes lying along the membrane channels and the incident beam were taken for five positions: 0°, 30°, 45°, 60° and 90°. The anisotropic scattering distribution of the two-dimensional patterns indicates an orientational alignment of the nanotubes. The one-dimensional intensity patterns obtained by scanning around the circumference of the (0 0 2) ring have allowed an estimation of the angular distribution of the nanotubes axes.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 302-306
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Origin of Magnetic Anisotropy of $Gd_{5}Si_{2}Ge_{2}$ Compound
    Autorzy:
    Szymczak, R.
    Kolano, R.
    Kolano-Burian, A.
    Hawelek, L.
    Krzymanska, B.
    Aleshkevich, P.
    Dyakonov, V.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428706.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.Sg
    Opis:
    The second-order anisotropy constant $K_2$ in polycrystalline $Gd_5Si_2Ge_2$ giant magnetocaloric material was measured as a function of temperature by the modified singular point detection technique. Although the structural, electrical, thermal, magnetic and magnetocaloric properties of the $Gd_5Si_2Ge_2$ have been rather well investigated experimentally, magnetic anisotropy of this system is almost unknown. The singularity indicating the anisotropy field was determined analyzing ac susceptibility data taking into account several features of the magnetization curve. The temperature dependence of the anisotropy fields was measured from 4.2 K up to the Curie temperature. The observed relationship between $K_2 (T)//K_2$ (0) and magnetization M (T)/M (0) was explained assuming dipolar origin of magnetic anisotropy of $Gd_5Si_2Ge_2$ compound.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1261-1262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Structural Study of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) Magnetocaloric Compounds Prepared by Arc Melting
    Autorzy:
    Hawelek, L.
    Wlodarczyk, P.
    Zackiewicz, P.
    Polak, M.
    Kaminska, M.
    Puźniak, R.
    Radelytskyi, I.
    Kolano-Burian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402326.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.30.Kz
    61.05.C-
    61.66.Fn
    Opis:
    Recently, room temperature magnetocaloric materials increasingly attracted attention in the development of magnetic refrigerators. In this paper, an effect of P/Ge substitution on the magnetic phase transition in the series of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) magnetocaloric compounds prepared by the arc melting technique and subsequent homogenization process has been studied. Calorimetric and magnetization results show that the temperature of structural phase transition coincide with the Curie temperature and fall within the temperature range 270-355 K. The magnetic entropy change reaches the maximum value for the compound with x=0.28 and equals to 32 J/(kg K) for the magnetic field change of 5 T. The adiabatic temperature change for the same sample, measured using magnetocalorimeter, is equal to 1.2 K for the magnetic field change of 1.7 T. It was found that the increase of Ge content in the sample causes weakening of first order magnetic transition, which is manifested by the lowering difference in transition temperature measured in two zero-field-cooling and field-cooled-cooling regimes.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 76-80
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical and Magnetic Properties of Selected Fe-Based High Entropy Alloys
    Autorzy:
    Perzyńska, K.
    Go, A.
    Szymański, K.
    Biernacka, M.
    Hawełek, Ł.
    Kalska-Szostko, B.
    Oleszak, D.
    Rećko, K.
    Waliszewski, J.
    Zaleski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375573.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.23.-k
    71.55.Ak
    72.15.-v
    72.15.Eb
    75.50.Bb
    82.80.Ej
    Opis:
    The electrical and magnetic properties of $Fe_{0.5}A_{0.5}$ alloys are presented, where the A corresponds to various compositions of the elements: A = (Al, Si, V, Cr, Co, Ga, Ni, Ge). The system is closely related to the known family of high entropy alloys. The samples were synthesized by arc melting and/or melt spinning technique and exhibit a regular type of crystal structure. Lattice parameters are systematically smaller than the estimates based on metallic radiuses of the elements. Temperature dependences of resistivities show maxima for some compositions. This behavior is consistent with results of electronic structure calculations, where a low density of states at the Fermi level were predicted. Also the measured magnetic moments are in good agreement with results of calculations. It is thus presented that some physical properties can be designed by appropriate choice of the chemical composition within the same simple structure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 999-1004
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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