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    Wyświetlanie 1-8 z 8
    Tytuł:
    Chemical, magnetic and Mössbauer effect analysis of road dust from expressway
    Autorzy:
    Szumiata, T.
    Gawroński, M.
    Górka, B.
    Brzózka, K.
    Świetlik, R.
    Trojanowska, M.
    Strzelecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147916.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    road dusts
    environmental dusts
    flame spectrometry
    Mössbauer spectrometry
    magnetic susceptibility
    Opis:
    Environmental dusts of urban and industrial origin are one of the most important factors responsible for air and soil pollution - mainly because of heavy metals content. In this work a dust collected from the acoustic barriers of E-77 expressway (Poland) has been investigated. Chemical analysis was performed by means of atomic absorption spectrometer with flame atomization (F-AAS). Fe, Al and Zn metals dominate in the investigated road dusts. Mossbauer spectra collected at room temperature enabled the identification of several iron-containing phases in the dust. Some traces of hematite and magnetite have been found as well as alfa-Fe phase in ferromagnetic state. A significant component could be interpreted as pure iron in paramagnetic state. The dominating doublet in the spectrum of high quadrupole splitting could correspond to iron carbonates. Complementary measurements of low-field AC magnetic susceptibility confirmed a different metal content in the road dust samples collected from different altitudes of acoustic barriers.
    Źródło:
    Nukleonika; 2013, 58, 1; 109-112
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iron-containing phases in fly ashes from different combustion systems
    Autorzy:
    Szumiata, T.
    Gzik-Szumiata, M
    Brzózka, K.
    Górka, B.
    Gawroński, M.
    Świetlik, R.
    Trojanowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148055.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fly ashes
    coal combustion
    Mössbauer spectrometry
    environmental protection
    Opis:
    The investigations of iron-containing phases existing in fly ashes were performed using transmission Mössbauer spectrometry. The examined samples of fly ashes were collected from different coal combustion systems, that is, stoker-fired boiler in municipal heating plant and pulverized coal boiler in power plant. Several phases are identifi ed in the samples: iron oxides, paramagnetic aluminosilicate glass with Fe3+ ions and Al2O4- -type spinel with Fe2+ ions. It was pointed out that proportions of contents of phases strongly depend not only on the combustion temperature but also on the way of ash collection.
    Źródło:
    Nukleonika; 2015, 60, 1; 151-154
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of Co and V substitution on structural properties of FINEMET-type alloys
    Autorzy:
    Szumiata, T.
    Gawroński, M.
    Brzózka, K.
    Górka, B.
    Sovák, P.
    Pavlík, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/148217.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    magnetic texture
    CEMS
    polarized radiation
    Opis:
    The effect of addition of Co and V on the hyperfine parameters of amorphous as well as nanocrystalline Finemet-type alloys has been studied by means of transmission Mössbauer spectrometry. It was stated that these elements infiltrate into crystalline grains in the course of crystallization, what causes alteration in structure. Different evolution of magnetic hyperfine field is reported in both cases and analyzed. In the series of alloys substituted by vanadium, the substantial paramagnetic component attributed to iron-poor regions in the amorphous remainder was found.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 21-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of thermal annealing on structure and oxidation of iron nanowires
    Autorzy:
    Krajewski, M.
    Brzózka, K.
    Górka, B.
    Lin, W.-S.
    Lin, H. -M.
    Szumiata, T
    Gawroński, M.
    Wasik, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/148838.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous iron and iron oxides
    iron nanowires
    Mössbauer spectroscopy
    Raman spectroscopy
    thermal annealing
    Opis:
    Raman spectroscopy as well as Mössbauer spectroscopy were applied in order to study the phase composition of iron nanowires and its changes, caused by annealing in a neutral atmosphere at several temperatures ranging from 200°C to 800°C. As-prepared nanowires were manufactured via a simple chemical reduction in an external magnetic fi eld. Both experimental techniques proved formation of the surface layer covered by crystalline iron oxides, with phase composition dependent on the annealing temperature (Ta). At higher Ta, hematite was the dominant phase in the nanowires.
    Źródło:
    Nukleonika; 2015, 60, 1; 87-91
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of Al doping on microstructure and hyperfine interactions in FINEMET
    Autorzy:
    Brzózka, K.
    Szumiata, T.
    Gawroński, M.
    Górka, B.
    Zorkovská, A.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147216.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    FINEMET
    nanocrystalline alloys
    Al-dopped FINEMET
    Opis:
    Structure and hyperfine interactions of amorphous and nanocrystalline FINEMET were investigated by means of Mössbauer spectrometry. It was found that substitution of x iron atoms with aluminum ones causes changes in the properties of both amorphous and nanocrystalline alloys as well as in the structure of individual phases. The reduction of hyperfine magnetic field caused by atom substitution is a non-linear function of x, unlike the linear dependence expected because of dilution. Temperature studies reveal a double magnetic phase transition at 250°C and 330°C as well as point to the variety of phases in the examined material.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 59-62
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iron-containing phases in metallurgical and coke dusts as well as in bog iron ore
    Autorzy:
    Szumiata, T.
    Rachwał, M.
    Magiera, T.
    Brzózka, K.
    Gzik-Szumiata, M.
    Gawroński, M.
    Górka, B.
    Kyzioł-Komosińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148303.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    metallurgical dusts
    coke dusts
    bog ore
    phase analysis
    Mössbauer spectrometry
    magnetic susceptibility
    Opis:
    Several samples of dusts from steel and coke plants (collected mostly with electro filters) were subjected to the investigation of content of mineral phases in their particles. Additionally, sample of bog iron ore and metallurgical slurry was studied. Next, the magnetic susceptibility of all the samples was determined, and investigations of iron-containing phases were performed using transmission Mössbauer spectrometry. The values of mass-specific magnetic susceptibility varied in a wide range: from 59 to above 7000 × 10−8 m3kg−1. The low values are determined for bog iron ore, metallurgical slurry, and coke dusts. The extremely high was obtained for metallurgical dusts. The Mössbauer spectra and X-ray diffraction patterns point to the presence of the following phases containing iron: hematite and oxidized magnetite (in coke and metallurgical dusts as well as metallurgical slurry), traces of magnetite fi ne grains fraction (in metallurgical dusts), amorphous glassy silicates with paramagnetic Fe3+ and Fe2+ ions, traces of pyrrhotite (in coke dusts), α-Fe and nonstoichiometric wüstite (in metallurgical slurry), as well as ferrihydrite nanoparticles (in bog iron ore). For individual samples of metallurgical dusts, the relative contributions of Fe2+/3+ ions in octahedral B sites and Fe2+ ions in tetrahedral A sites in magnetite spinel structure differs considerably.
    Źródło:
    Nukleonika; 2017, 62, 2; 187-195
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer study of vacuum annealed Fe100-xGax (10 less - than or equal to x less - than or equal to 35) thin films
    Autorzy:
    Szumiata, T.
    Górka, B.
    Brzózka, K.
    Gawroński, M.
    Gzik-Szumiata, M.
    Javed, A.
    Morley, N. A.
    Gibbs, M. R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147332.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Fe-Ga
    thin films
    CEMS
    MOKE
    Opis:
    This work reports results from comparative Mossbauer studies of as-deposited and annealed Fe100.xGax (10 less - than or equal to x less - than or equal to 35) high magnetostrictive thin films of constant thickness (50 plus or minus 2 nm). Films were grown on Si(100) substrates using a co-sputtering and evaporation chamber where Fe has been sputtered and Ga was evaporated. During growth of films, a magnetic field of 65 kA/m has been applied in the plane of the film. Annealed films have been obtained by heating in vacuum for 1 h at 350 centigrade without magnetic field. After annealing, the saturation field of the Fe-Ga films has been significantly reduced. By means of the 57Fe CEMS technique the contributions from several phases have been found: Fe-Ga A2 (bcc), traces of DO3 phase, a gallium-rich disordered phase and iron oxides (both geothite and magnetite). For the sample with x = 26.5 the heat treatment reduces the DO3 phase content whereas for the film with x = 16.4 the opposite tendency has been observed. Mossbauer results were compared with XRD and MOKE findings.
    Źródło:
    Nukleonika; 2013, 58, 1; 27-30
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine fields and magnetoelastic surface effects in Fe72Cu1.5Nb4Si13.5B9 nanocrystalline alloy
    Autorzy:
    Szumiata, T.
    Gawroński, M.
    Górka, B.
    Brzózka, K.
    Blázquez-Gámez, J.
    Kulik, T.
    Żuberek, R.
    Ślawska-Waniewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148767.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    FINEMET
    Mössbauer spectroscopy
    nanocrystalline alloys
    surface effects
    surface magnetostriction
    Opis:
    In this work hyperfine fields of two-phase nanocrystalline Fe72Cu1.5Nb4Si13.5B9 alloys were studied in order to verify the existence of surface effects. To obtain a series of nanocrystalline samples with small grains of different sizes, a special non- -isothermal annealing procedure of an initially amorphous ribbon was applied. In the case of samples with a significant amount of crystallites, a high field (about 27.5 T) component of continuous part of the hyperfine field distribution was found that could be attributed to boundary regions between the grains and rest of the sample. The existence of the surface effects was confirmed in the magnetostrictive experiment.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 85-88
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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