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    Wyświetlanie 1-5 z 5
    Tytuł:
    Ordering of alfa-FeCo phase in the nanocrystalline Fe83-xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloy
    Autorzy:
    Zbroszczyk, J.
    Młyńczyk, A.
    Olszewski, J.
    Ciurzyńska, W.
    Wysłocki, B.
    Perduta, K.
    Lelątko, J.
    Nabiałek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148219.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    nanocrystalline alloys
    microstructure
    ordering
    Mössbauer spectroscopy
    Opis:
    The microstructure and ordering of alfa-FeCo phase of the nanocrystalline Fe83 xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloys were investigated. We have stated that á-FeCo phase is atomically ordered in the Fe83 xCoxNb3B13Cu1 (x = 25 or 41.5) samples crystallized by the heat treatment in a furnace. However, after flash annealing (by current or laser) that phase is disordered. Moreover, we have found that Co concentration in the crystalline alfa-FeCo phase strongly depends on Co content in the as-quenched ribbons. The annealing conditions influence also the grain diameter of the crystalline phase. In the nanocrystalline alloys obtained by a flash annealing of the amorphous ribbons finer grains are present.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 29-32
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local atomic configuration in mechanically synthesized Co-Fe-Ni alloys
    Autorzy:
    Pikula, T.
    Oleszak, D.
    Żurawicz, J.
    Jartych, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/148207.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    nanocrystalline alloys
    mechanical alloying
    hyperfine interactions
    Mössbauer spectroscopy
    Opis:
    Ternary Co-Fe-Ni alloys were prepared from the elemental powders by the mechanical alloying method. Structural properties and hyperfine interactions parameters were determined using X-ray diffraction and Mössbauer spectroscopy. X-ray diffraction proved that during milling Co-Fe-based solid solutions with b.c.c. lattice were formed in the case of Co40Fe40Ni20 and Co50Fe40Ni10 alloys, while for Co52Fe26Ni22 and Co65Fe23Ni12 compositions Co-Ni-based solid solutions with f.c.c. lattice were obtained. Mössbauer spectroscopy revealed similar values of the average hyperfine magnetic fields for all the alloys. These values corresponded to the different surroundings of 57Fe isotopes by Co, Fe and Ni atoms, depending on the chemical composition of the alloy. The possible atomic configurations around 57Fe isotopes were discussed on the basis of the local environment model under the assumption that only the first nearest neighbours contribute to the hyperfine magnetic field at 57Fe site.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 47-50
    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:
    Mössbauer and magnetic studies of FeCoNiCuNbSiB nanocrystalline alloys
    Autorzy:
    Grabias, A.
    Basykh, V.
    Ferenc, J.
    Cieślak, G.
    Kulik, T.
    Kopcewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146338.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous ribbons
    nanocrystalline alloys
    Mössbauer spectroscopy
    soft magnetic properties
    Opis:
    Nanocrystalline Fe80–x–yCoxNiyCu1Nb3Si4B12 alloys were prepared by the annealing of amorphous ribbons. Primary crystallization of the alloys annealed at temperatures of between 500 and 550°C was studied by X-ray diffraction and Mössbauer spectroscopy. Magnetic properties of the alloys were investigated using a hysteresis loop tracer and vibrating sample magnetometer. The annealed ribbons are composed of a two-phase nanostructure consisting of bcc Fe-based grains embedded in an amorphous matrix. Conversion electron Mössbauer spectroscopy (CEMS) measurements reveal a more advanced crystallization process in the surface layers when compared with the volume of the ribbons. The degree of saturation magnetization of the nanocrystalline alloys is of about 1.5 T. The coercive fi eld varies from 1.0 to 6.5 A/m and peaks at an annealing temperature of 525°C. Magnetic softening of the nanocrystalline alloys observed after annealing at 550°C is correlated with a volume fraction of the nanocrystalline bcc phase.
    Źródło:
    Nukleonika; 2017, 62, 2; 79-84
    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 1-5 z 5

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