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Wyświetlanie 1-15 z 37
Tytuł:
Mössbauer Investigations and Photoemission Studies of the Fe 3s Spin Splitting in Some Fe-Ni Alloys
Autorzy:
Kądziołka-Gaweł, M.
Zarek, W.
Talik, E.
Popiel, E.
Powiązania:
https://bibliotekanauki.pl/articles/1811577.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Ej
82.80.Pv
Opis:
The magnetic properties, crystal and electronic structure for $Fe_{1-x}Ni_x$ (x=0.30, 0.325, 0.375) alloys and austenitic steel were studied using magnetostatic, Mössbauer effect methods, X-ray diffraction and X-ray photoelectron spectroscopy. The compositions of the investigated Fe-Ni alloys were chosen like that to exist on left, right and in inside of invar range. Two different magnetic moments (low and high) of Fe atom were observed. Measurement results do not show antiferromagnetic order in Fe-Ni alloys.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1493-1500
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Electronic Properties of GdNi$\text{}_{5-x}$Al$\text{}_{x}$ Intermetallic Compounds
Autorzy:
Coldea, M.
Chiuzbaian, S. G.
Neumann, M.
Todoran, D.
Demeter, M.
Tetean, R.
Pop, V.
Powiązania:
https://bibliotekanauki.pl/articles/2014461.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
71.20.Lp
Opis:
X-ray photoelectron spectroscopy and magnetic susceptibility of GdNi$\text{}_{5}$, GdNi$\text{}_{4}$Al, GdNi$\text{}_{2}$Al$\text{}_{3}$ and GdNiAl$\text{}_{4}$ are reported. The magnetic state of Ni 3d-electrons strongly depends on the crystallographic structure of the compounds, showing spin fluctuations in GdNi$\text{}_{5}$ and GdNi$\text{}_{4}$Al, a similar behavior with that of metallic Ni in GdNi$\text{}_{2}$Al$\text{}_{3}$ and a filled 3d-band in GdNiAl$\text{}_{4}$.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 629-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Valence Band Modifications on Hydrogen Absorption in Zr-Pd Alloy Thin Films
Autorzy:
Jabłoński, B.
Pacanowski, S.
Werwiński, M.
Marczyńska, A.
Dawczak-Dębicki, H.
Szajek, A.
Smardz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1030742.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.-f
82.80.Pv
Opis:
We study the valence band modifications of in-situ prepared nano- and polycrystalline Pd-Zr alloy thin films using X-ray photoelectron spectroscopy. Results were compared with valence bands calculated by ab initio methods. Furthermore, hydrogen absorption and desorption kinetics under pressure of about 570 mbar were studied in Pd covered nanocrystalline ZrPd₂ alloy thin film. Results showed that modifications of the valence band of the nanocrystalline alloy thin film could significantly influence on hydrogen absorption and desorption process.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 620-623
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valence Band and Core Levels of $Ce_5Ni_2Si_3$ Crystal Studied by X-ray Photoemission Spectroscopy
Autorzy:
Toliński, T.
Kowalczyk, A.
Chełkowska, G.
Mihalik, M.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813673.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
82.80.Pv
Opis:
The crystal of $Ce_5Ni_2Si_3$ was prepared by the Czochralski method. The X-ray photoemission spectroscopy was measured for the valence band and the core levels. Based on the Ce(3d) doublet and its satellites a small value of the hybridization parameter of the f-states with the conduction electrons Δ=4 meV and the f-occupancy $n_f$ close to 1 were found. X-ray photoemission spectroscopy shows that the region between 0 and 3 eV is predominated by the Ni(3d) and Ce(4f) peaks. Some features of the multiplet structure of the Ce(4f) states are also visible close to the Fermi level.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 327-330
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and X-Ray Photoemission Spectra of MPtSn ( rm M = Ti, Zr, Hf)
Autorzy:
Morkowski, J.
Szajek, A.
Chełkowska, G.
Bajorek, A.
Troć, R.
Powiązania:
https://bibliotekanauki.pl/articles/1808034.pdf
Data publikacji:
2009-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
82.80.Pv
Opis:
The electronic structures of the half-Heusler isostructural compounds TiPtSn, ZrPtSn and HfPtSn were calculated and measured applying the X-ray photoemission spectroscopy. The (Ti, Zr, Hf)PtSn compounds have gaps between the occupied valence band and the empty conduction band, calculated as about 0.75, 1.12, and 1.09 eV, respectively. The calculations were done by the full-potential local orbitals method in the framework of the local spin-density approximation and partly also by the full-potential linear muffin-tin orbitals method by the LmtART code. Experimental X-ray photoemission spectra were measured using photons of energy of 1486.6 eV. The experimental and calculated spectra match quite well except a small shift in the energy scale.
Źródło:
Acta Physica Polonica A; 2009, 115, 5; 935-940
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Structure of Dilute Metastable Co-Ag Alloys
Autorzy:
Morkowski, J. A.
Szajek, A.
Powiązania:
https://bibliotekanauki.pl/articles/2014364.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
71.20.-b
Opis:
Co-Ag systems have recently attracted considerable attention in application oriented research of ferromagnetic thin films and multilayers. Due to low miscibility of Ag in Co it is easy to fabricate thin Co-Ag films of granular structure, promising as a high magnetoresistance material. It was also shown that using modern technology it is possible to deposit thin films of Co-Ag forming metastable homogeneous alloys for compositions far exceeding the solubility limit. In the present paper results of electronic structure calculations by the tight-binding linear muffin-tin orbital method are reported. Computations were done for hypothetical uniform ordered Co$\text{}_{100-x}$Ag$\text{}_{x}$ alloys assuming proper extended unit cells to simulate concentrations of x=25, 12.5, 6.25, 3.125 at.%. The results were used to calculate the photoemission spectra. The calculated photoemission spectra are in fair agreement with experimental data supporting the conclusion of existence of a homogeneous though metastable alloy in the dilute limit. On the contrary, superposition of pure Co and Ag spectra implied for precipitate of Ag in Co cannot explain the experimental data.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 447-455
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of UCo$\text{}_{4}$B Compound
Autorzy:
Szajek, A.
Smardz, L.
Szlaferek, A.
Kowalczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/2014433.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
71.20.-b
Opis:
UCo$\text{}_{4}$B is a member of uranium intermetallic borides family which crystallizes in the hexagonal CeCo$\text{}_{4}$B structure. The experimental data suggest the occurrence of the spin-fluctuation behaviour of UCo$\text{}_{4}$B. In this paper we present the results of band structure calculations using the ab-initio tight binding linear muffin-tin orbital method. We found good agreement between the experimental X-ray photoemission spectroscopy valence band spectrum and the ab-initio results.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 599-603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Comparison of the Information Depth of AEAPS, DAPS and AES
Autorzy:
Hucek, S.
Pavluch, J.
Powiązania:
https://bibliotekanauki.pl/articles/1892436.pdf
Data publikacji:
1992-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
79.20.Fv
Opis:
The information depths of AEAPS and DAPS for the Ti and Cr L$\text{}_{3}$, L$\text{}_{2}$ and L$\text{}_{1}$ subshell excitation and of AES for the Ti L$\text{}_{3}$M$\text{}_{2,3}$M$\text{}_{2,3}$, L$\text{}_{3}$M$\text{}_{2,3}$M$\text{}_{4,5}$ and Cr L$\text{}_{3}$M$\text{}_{2,3}$M$\text{}_{4,5}$ transitions were determined. A set of Cr samples with Ti overlayers had been prepared in situ. Measurements of the LEAPS and HEAPS signal amplitudes were used to derive the AEAPS and DAPS signal intensities. The results showed that both AEAPS and DAPS had lower information depths compared with AES. They are interpreted in terms of the mean free paths of the majority of electrons contributing to the AEAPS signal.
Źródło:
Acta Physica Polonica A; 1992, 81, 2; 187-191
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Inelastic Mean Free Path οf Electrons. Research in Budapest, Warsaw, Wrocław and Clermont-Ferrand. Brief History and New Results
Autorzy:
Gergely, G.
Gurban, S.
Menyhard, M.
Jablonski, A.
Zommer, L.
Powiązania:
https://bibliotekanauki.pl/articles/1177408.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Cy
82.80.Dx
82.80.Pv
Opis:
The inelastic mean free path of electrons (IMFP) is an important material parameter for description of electron transport processes in solids. This parameter is particularly useful for quantifying the electron spectroscopies, in particular Auger electron spectroscopy, X-ray photoelectron spectroscopy, electron energy loss spectroscopy and elastic peak electron spectroscopy. In this work, a brief overview of the IMFP determination is presented. Generally, there are two groups of methods to determine the IMFP: (i) calculations using the theoretical model based on the experimental optical data, and (ii) calculations using theory relating the IMFP and the measured probability elastic electron backscattering from solids. Major advances in the development of the second group of methods were made in three laboratories; these advances are reviewed here. The elastic backscattering probability, in absolute or relative units, can be conveniently evaluated from the elastic peak intensity. However, much effort is needed to develop the theory for calculating the IMFP, which typically involves the Monte Carlo simulations of electron trajectories in solids. Presently, this theory and typical procedures of the spectra processing are implemented in the software package EPESWIN developed by Jablonski. In recent years, much attention is devoted to the phenomenon of the electron energy losses in the surface region of solids. Reliability of the theory of elastic backscattering is distinctly improved if this effect is taken into account.
Źródło:
Acta Physica Polonica A; 2008, 114, S; S-49-S-58
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanochemical Preparation and Properties of Nanodimensional Perovskite Materials
Autorzy:
Cherkezova-Zheleva, Z.
Paneva, D.
Yordanova, I.
Shopska, M.
Kolev, H.
Powiązania:
https://bibliotekanauki.pl/articles/1375187.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
82.80.Ej
82.80.Pv
Opis:
The study is focused on the synthesis of $LaMO_3$ (M = Co, Fe, Mn) perovskite materials using combination of precipitation of precursors and mechanical milling at room temperature. Physicochemical properties of products at each step of preparation were studied by powder X-ray diffraction, Mössbauer spectroscopy, infrared spectroscopy (in the middle and far regions) and X-ray photoelectron measurements. As-prepared perovskite powders are composed of nanoparticles with very fine crystallite size (about 15 nm) in all cases. The materials have also high dispersion, high extent of microstrains and high level of oxygen vacancies which is very important in relevance to their use as heterogeneous catalysts.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 916-920
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Recoil Effect and Surface Excitations on the Inelastic Mean Free Paths of Electrons in Polymers
Autorzy:
Lesiak, B.
Kosiński, A.
Jablonski, A.
Sulyok, A.
Gergely, G.
Tóth, J.
Varga, D.
Powiązania:
https://bibliotekanauki.pl/articles/2046849.pdf
Data publikacji:
2006-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.35.Cd
82.80.Pv
87.16.Ac
Opis:
In this work, the influence of recoil effect and surface excitations on the inelastic mean free paths for polythiophenes is investigated. The inelastic mean free paths of electrons in polythiophenes are measured with the elastic peak electron spectroscopy method using the Ag standard and the electron elastic scattering cross-sections from the database NIST 3.1 in the electron kinetic energy range 200-5000 eV. The Monte Carlo model is applied for evaluating the electron backscattering intensities from the polymers and the Ag standard, as well as for evaluating electrons quasi-elastically backscattered from atoms of different atomic numbers (the recoil effect). The surface excitation corrections are accounted for using the formalism of Chen, with the material parameters for polythiophenes evaluated from the elastic peak electron spectroscopy method. Deviations due to recoil effect and surface excitations to the inelastic mean free paths are compared and discussed. Correction to the inelastic mean free paths due to recoil effect is considerable but is smaller, however, than the correction due to surface excitations. Accounting for recoil effect and surface excitations leads to improvement of the inelastic mean free paths, as compared to the inelastic mean free paths resulting from the predictive formulae of Gries.
Źródło:
Acta Physica Polonica A; 2006, 109, 6; 789-800
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Study of Co Adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures
Autorzy:
Godowski, P. J.
Onsgaard, J.
Christensen, S. V.
Nerlov, J.
Powiązania:
https://bibliotekanauki.pl/articles/1945414.pdf
Data publikacji:
1996-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
33.60.-q
82.80.Pv
Opis:
Improved adsorption characteristics of a K predosed Cu(110) surface with a coverage corresponding to a point before the work function minimum have been confirmed. Analysis of the CO-induced orbitals in the photoelectron spectra of the CO/K/Cu(110) interface for low coverages of carbon monoxide adsorbed at 118 K has been done. Noticeable changes of the parameters of the orbitals with increasing CO coverage have been registered. Elongation of the C-O bond without dissociation of the molecule has been deduced from the energetic separation of 3.4 eV between the 4σ and the 1π orbital. A weakening of the CO-interface bond with coverage has been found on the base of decreasing 5σ-1π separation with increasing 4σ/5σ intensity ratio. Perpendicular orientation of CO molecules to the plane of the substrate surface has been concluded from analysis of the constant initial state spectra of the 4σ and 5σ/1π orbitals.
Źródło:
Acta Physica Polonica A; 1996, 89, 5-6; 657-664
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition of a Clean and Sulphur Covered CuNi(100) Single Crystal Surface
Autorzy:
Godowski, P. J.
Marcus, P.
Powiązania:
https://bibliotekanauki.pl/articles/1932121.pdf
Data publikacji:
1995-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
61.14.Hg
68.35.Dv
Opis:
Surface composition of the CuNi(100) single crystal in the temperature range of 893÷1073 K (620÷800°C) has been investigated using low energy electron diffraction and Auger electron spectroscopy methods. A clean sample surface at moderate temperatures reveals small surface copper enrichment, with respect to the bulk Cu-rich composition. For example, at 1006 K (733°C) the copper surface concentration C$\text{}_{Cu}^{s}$, was determined from the quantitative Auger electron spectroscopy analysis as 0.91. After prolonged heating at higher temperatures, the copper surface concentration converges to the bulk value, i.e. at 1073 K (800°C), C$\text{}_{Cu}^{s}$ = C$\text{}_{Cu}^{b}$ = 0.87. Surface segregation of sulphur proceeds from (1 × 1) through p(2 × 2)S/CuNi(100) to c(2 × 2)S/CuNi(100) structures of low energy electron diffraction. In the presence of segregated sulphur the surface concentration of copper is lower.
Źródło:
Acta Physica Polonica A; 1995, 87, 3; 619-630
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Study of CO$\text{}_{2}$ adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures
Autorzy:
Godowski, P. J.
Onsgaard, J.
Hoffmann, S. V.
Nerlov, J.
Powiązania:
https://bibliotekanauki.pl/articles/2007842.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
33.60.-q
82.80.Pv
Opis:
Using photoemission spectroscopy, adsorption and reaction of CO$\text{}_{2}$ on potassium modified Cu(110) were studied. In agreement with published results of thermally programmed desorption, apart from carbonate and carbon monoxide as the disproportionation reaction products, a linear CO$\text{}_{2}$ molecule and a bent active CO$\text{}_{2}$(-) species were identified. The reaction paths are independent on the potassium precoverage but the number of CO$\text{}_{3}$ molecules increases with the number of potassium adatoms. The presence of the CO$\text{}_{2}$(-), stable up to 200 K, suitable for the reactivity of the interface in respect of the methanol synthesis, could be confirmed in the complex valence band spectra by occurrence of the characteristic peak at binding energy of 6.8 eV.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 423-431
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of Electronic Structure of n-GaN(0001) Surface by N⁺-Ion Bombardment
Autorzy:
Grodzicki, M.
Mazur, P.
Ciszewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1033786.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.47.Fg
73.30.+y
82.80.Pv
Opis:
The electronic structure of n-type GaN(0001) surface and its modification by N⁺ ion bombardment are presented in this report. The studies were carried out in situ in ultrahigh vacuum by ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and low-energy electron diffraction. Low-energy N⁺ ion bombardment, which was done using an ion gun at an energy of 200 eV, leads to nitriding of the surface. The process changes the surface stoichiometry and, consequently, provides formation of a disordered altered GaN layer. The calculated electron affinity of the clean n-GaN surface of 3.4 eV and band bending of 0.2 eV became changed after bombardment to 2.9 eV and 0.8 eV, respectively. The obtained difference in valence band maximum between the clean sample and the bombarded one was 0.6 eV.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 351-353
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 37

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