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Wyszukujesz frazę "Jezierski, M." wg kryterium: Autor

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    Wyświetlanie 1-14 z 14
    Tytuł:
    Magnetism in FeRh Alloys
    Autorzy:
    Pugacheva, M.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1861254.pdf
    Data publikacji:
    1994-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Pi
    75.10.Lp
    Opis:
    We study the electronic and magnetic properties of FeRh ordered alloys. The electronic structure is calculated by the tight-binding linear muffin-tin orbital method. We observe the decreasing magnetic moment with increase of the ratio c/a during the structural phase transformation from CsCl to CuAu type structure.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 1; 219-221
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Hydrogenation on the Electronic Structure of HoNiSn - Ab Initio Calculations
    Autorzy:
    Jezierski, A.
    Szajek, A.
    Jurczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537053.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.15.Ap
    71.15.Mb
    71.20.Eh
    71.20.Lp
    Opis:
    The electronic and magnetic properties of HoNiSn alloy are studied by ab initio full relativistic full potential local orbital method within the local density approximation. The electronic structures are reported for two crystallographic structures: orthorhombic TiNiSi type and the hexagonal ZrNiAl-type structure. We also study the influence of hydrogenation on the electronic structure of $HoNiSnH_{0.66}$. Ab initio calculations have shown that in the both type of structures the Fermi level is located at the 4f peak of Ho, however we observed the modification of 3d peaks from nickel atoms below the Fermi energy. The hydrogenation leads to increase of the density of states at the Fermi level.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 346-349
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Electronic and Electrochemical Properties of the $LaNi_5$-Based Alloys
    Autorzy:
    Szajek, A.
    Jezierski, A.
    Nowak, M.
    Jurczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810498.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    81.20.Ev
    Opis:
    Mechanical alloying was used to synthesize $LaNi_5$-type hydrogen storage materials. X-ray diffraction analysis showed that, after 30 h milling, the starting mixture of the elements was decomposed into an amorphous phase. Following the annealing in high purity argon at 700°C for 0.5 h, X-ray diffraction confirmed the formation of the $CaCu_5$-type structures. The nanocrystalline materials were used as negative electrodes for a $Ni-MH_x$ battery. A partial substitution o Ni by Al or Mn in $LaNi_{5-x}M_x$ alloy leads to an increase in discharge capacity. On the other hand, the alloying elements such as Al, Mn and Co greatly improved the cycle life of $LaNi_5$ material. For example, in the nanocrystalline $LaNi_{3.75}Mn_{0.75}Al_{0.25}Co_{0.25}$ powder, discharge capacities of up to 258 mA h $g^{-1}$ (at 40 mA $g^{-1}$ discharge current) were measured. The band structure ab initio calculations showed that 3g sites are preferred by Al, Co, and Mn atoms in the unit cell.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 247-250
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure of $Mg_2Ni_{1-x}Cu_{x}$
    Autorzy:
    Jezierski, A.
    Jurczyk, M.
    Szajek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810475.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.20.Be
    Opis:
    Nanocrystalline $Mg_{2}Ni$ doped alloys are good materials for hydrogen storage. In this work we present the influence of the chemical disorder on the electronic structure of $Mg_{2}Ni_{1-x}Cu_{x}$ alloys for 0 < x < 0.2. The electronic structure was calculated by ab initio full potential scalar relativistic local-orbital method in the coherent potential approximation. We observe the change of the density of states near the Fermi energy.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 223-225
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure of BiFeO₃ in Different Crystal Phases
    Autorzy:
    Kaczkowski, J.
    Pugaczowa-Michalska, M.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385201.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    77.84.-s
    75.85.+t
    75.47.Lx
    Opis:
    The electronic structure of different phases of BiFeO₃ were calculated by using density functional theory. The DFT+U and semilocal Tran-Blaha modified Becke-Johnson potential were used. DFT+U results are in good agreement with previous calculations. Our results have shown that in case of R3c, Pnma, Pn2₁a BiFeO₃ has G-antiferromagnetic ordering and C-antiferromagnetic in case of Cm space group. In all calculated structures BiFeO₃ is a semiconductor with the band gap: 2.26 eV (2.27 eV) for R3c, 1.91 eV (1.66 eV) for Pnma, 1.99 eV (2.18 eV) for Pn2₁a and 2.09 eV (2.55 eV) for Cm within DFT+U (Tran-Blaha modified Becke-Johnson).
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 266-268
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Orthorhombic Phase of $La_{0.5}Bi_{0.5}NiO₃$ Studied by First Principles
    Autorzy:
    Kaczkowski, J.
    Pugaczowa-Michalska, M.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1397031.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.20.-b
    71.20.Nr
    77.84.Bw
    Opis:
    The aim of presented first principles study of $La_{0.5}Bi_{0.5}NiO₃$ is to investigate electronic structure of orthorhombic phase Pbnm. The calculations show that metallicity and magnetism of the system are strongly related with hybridization between Ni 3d and O 2p. To improve the quality of the electronic structure description of the system, especially the treatment of correlation for the Ni 3d, we employ GGA, LDA, and GGA+U, LDA+U. The LSDA results give good agreement with experiment. Thus, the screening effects originating from the hybridized Ni 3d and O 2p electrons are sufficiently strong that they reduce the electronic correlations in the $La_{0.5}Bi_{0.5}NiO₃$, making it a weakly correlated metal.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 408-410
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure of Ternary Antimonides YbPdSb
    Autorzy:
    Hermanowicz, M.
    Jezierski, A.
    Kaczkowski, J.
    Kaczorowski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810476.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    71.15.Ap
    71.15.Mb
    71.20.Eh
    71.20.Lp
    Opis:
    In this paper we present the electronic structure and magnetic properties of YbPdSb in low-temperature MgAsAg-type structure and high-temperature TiNiSi-type structure. The calculations were performed by ab initio full-relativistic full potential local orbital method within the local spin density approximation. Ab initio calculations showed the metallic character of YbPdSb compound in both structures. The density of states at the Fermi level is greater in high-temperature than in low-temperature structure.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 226-228
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultramarine, Lazurite and Sodalite Studied by Positron Annihilation and EPR Methods
    Autorzy:
    Baranowski, A.
    Dębowska, M.
    Jerie, K.
    Jezierski, A.
    Sachanbiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933463.pdf
    Data publikacji:
    1995-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.60.+z
    78.70.-g
    61.90.+d
    76.30.-v
    Opis:
    Studies of positron annihilation accompanied by EPR technique were undertaken for sodalite and lazurite and their synthetic counterparts (synthetic sodalite and ultramarines). Results of measurements performed by two techniques of positron annihilation spectroscopy (angular correlation of annihilation radiation, ACAR, and positron annihilation lifetime) revealed the undoubted influence of free radicals on positron annihilation mechanism but both inhibition of positronium formation by them and the effect of filling cages ought to be taken into account. The distinct differences between ACAR curves for sodalites, lazurites and ultramarines probably reflect the presence of different radicals in their cages and chemical heterogeneity as well as the disorder in Al, Si-site ordering in case of ultramarines. Comparison of the results of ACAR measurements with the ones of the EPR studies indicates that there is correspondence between them. Similarly to three families of the ACAR curves, different likes of EPR lines were obtained for three groups of samples; sodalites, lazurites and ultramarines. It is possible that the annihilation of positrons takes place mainly with unpaired electrons recorded by the EPR technique.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 1; 29-41
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure and Magnetic Properties of Intermetallic Alloys
    Autorzy:
    Jezierski, A.
    Pugacheva, M.
    Morkowski, J. A.
    Szajek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953169.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    75.10.Lp
    Opis:
    We present the influence of local ordering on the electronic and magnetic properties of Heusler-type alloys. The band structure and magnetic moments are calculated by ab initio spin-polarized tight binding linear muffin-tin orbital method. The calculated electronic density of states for Pd$\text{}_{2}$TiAl alloy is similar to ultraviolet photoelectron spectroscopy measurements. The self-consistent band calculations showed that the density of states at the Fermi level in Ni$\text{}_{2}$(Nb$\text{}_{(1-x)}$Ti$\text{}_{x}$)Sn and Ni$\text{}_{2}$(Nb$\text{}_{(1-x)}$Ta$\text{}_{x}$)Sn alloys decreased with the increase in Ti or Ta concentration. The total and local magnetic moments in ordered Rh$\text{}_{2}$TMSn (TM = Mn, Fe, Co, Ni, Cu) and Rh$\text{}_{2}$MnX (X = Al, Ga, In, Ge, Sb, Pb) Heusler-type alloys are calculated. The difference between theoretical and experimental results can be connected to the partial disorder in the samples.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 151-159
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure and Magnetic Properties of $Ni_2MnGa_{1-x}Ge_{x}$ and Disordered $Ni_{2}MnSn$ Heusler Alloys
    Autorzy:
    Pugaczowa-Michalska, M.
    Jezierski, A.
    Dubowik, J.
    Kaczkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810489.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    71.20.Be
    71.20.-b
    Opis:
    In this work we present the influence of atomic disorder on the electronic and magnetic properties of $Ni_{2}MnGa_{1-x}Ge_{x}$ and $Ni_{2}MnSn$ Heusler alloys. Ab initio band calculations were performed for the experimental lattice parameters. We applied SPR-KKR-CPA methods in the local spin density approximation.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 241-243
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interface and Surface Subsignals in Photoreflectance Spectra for GaAs/SI-GaAs Structures
    Autorzy:
    Jezierski, K.
    Sitarek, P.
    Misiewicz, J.
    Panek, M.
    Ściana, B.
    Korbutowicz, R.
    Tłaczała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933782.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    71.35.+z
    Opis:
    Photoreflectance spectra were measured at room temperature for energies in the vicinity of the E$\text{}_{0}$ critical point for p-type as well as n-type doped GaAs/SI-GaAs structures. Depending on the doping concentration the existence of two photoreflectance subsignals was observed; the first one arises from the surface space charge region while the second one from the interface region. The decomposition of photoreflectance spectrum into surface and interface subsignals was based on the photoreflectance measurements carried out for different wavelengths of the laser pump beam.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 751-754
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Photoemission Spectra of Dy(Co$\text{}_{1-x}$Al$\text{}_{x}$)$\text{}_{2}$ Systems
    Autorzy:
    Szajek, A.
    Jezierski, A.
    Kowalczyk, A.
    Baszyński, J.
    Bartkowski, St.
    Neumann, M.
    Borstel, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955840.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    71.20.-b
    79.60.-i
    Opis:
    The electronic structure of Dy(Co$\text{}_{1-x}$Al$\text{}_{x}$)$\text{}_{2}$ compounds (Laves phase - MgCu$\text{}_{2}$, C15) for Al concentrations x = 0.0, 0.1, 0.2 was investigated by X-ray photoelectron spectroscopy. The results were compared with the ab initio band structure calculations.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 439-442
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity and Electronic Structure of the W$\text{}_{7}$Re$\text{}_{13}$B Compound
    Autorzy:
    Kowalczyk, A.
    Andrzejewski, B.
    Jezierski, A.
    Toliński, T.
    Szlaferek, A.
    Falkowski, M.
    Chełkowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046770.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    74.70.-b
    74.25.Ha
    74.25.Jb
    82.80.Pv
    Opis:
    The superconductor W$\text{}_{7}$Re$\text{}_{13}$B has been studied by the magnetic measurements and microwave absorption. The crystal structure of W$\text{}_{7}$Re$\text{}_{13}$B is cubic (β-Mn type). This compound exhibits a sharp superconducting transition at a temperature of T$\text{}_{c}$=7.2 K. The electronic structure of W$\text{}_{7}$Re$\text{}_{13}$B has been studied by X-ray photoelectron spectroscopy and the band structure has been calculated by the full-potential local-orbital minimum-basis method using the scalar-relativistic mode. The main contribution to the density of states at the Fermi level is from 5d electrons of W and Re. The W and Re bands are similar and substituting W by Re does not change the total density of states.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 597-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Chemical Disorder on Geometrically Frustrated Kagome Lattice
    Autorzy:
    Szymczak, H.
    Szymczak, R.
    Baran, M.
    Fink-Finowicki, J.
    Krzymanska, B.
    Aleshkevych, P.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812268.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.30.Gw
    75.30.Kz
    75.50.-
    Opis:
    This paper reviews recent progress in the studies of magnetic dilutions on magnetic properties of two frustrated systems: magnetoplumbite-like $SrGa_{12-x}Cr_xO_{19}$ and kagome staircase $Co_3V_2O_8$ doped with Mg ions. In the first group of compounds magnetic properties are determined by magnetic defects arising due to doping. In the case of kagome staircase compounds magnetic dilution suppresses effects of crystal field acting on magnetic ions. In particular, the dilution decreases magnetocrystalline anisotropy and anisotropy of magnetization.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 35-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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