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    Wyświetlanie 1-9 z 9
    Tytuł:
    Hyperfine interactions and some thermomagnetic properties of amorphous FeZr(Cr)NbBCu alloys
    Autorzy:
    Łukiewska, A.
    Olszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146540.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous Fe-based alloys
    invar effect
    Mössbauer spectroscopy
    Opis:
    In this research, we studied the magnetic phase transition by Mössbauer spectroscopy and using vibrating sample magnetometer for amorphous Fe86–xZr7CrxNb2Cu1B4 (x = 0 or 6) alloys in the as-quenched state and after accumulative annealing in the temperature range 600–750 K. The Mössbauer investigations were carried out at room and nitrogen temperatures. The Mössbauer spectra of the investigated alloys at room temperature are characteristic of amorphous paramagnets and have a form of asymmetric doublets. However, at nitrogen temperature, the alloys behave like ferromagnetic amorphous materials. The two components are distinguished in the spectrum recorded at both room and nitrogen temperatures. The low field component in the distribution of hyperfine field induction shifts towards higher field with the annealing temperature. It is assumed that during annealing at higher temperature, due to diffusion processes, the grains of α-Fe are created in the area corresponding to this component. Both investigated alloys show the invar effect and the decrease of hyperfine field induction after annealing at 600 K for 10 min is observed. It is accompanied by the lowering of Curie temperature.
    Źródło:
    Nukleonika; 2017, 62, 2; 135-140
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heat treatment on the shape of the hyperfine field induction distributions and magnetic properties of amorphous soft magnetic Fe62Co10Y8B20 alloy
    Autorzy:
    Gruszka, K. M.
    Nabiałek, M.
    Błoch, K
    Olszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146668.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bulk amorphous
    Kronmüller theory
    Mössbauer spectroscopy
    vibrating sample magnetometer
    VSM
    Opis:
    Thermal treatment, undertaken at just below the crystallization temperature, has led to nanocrystallization and has had a signifi cant impact on the shape of the hyperfine field induction distributions of Fe62Co10Y8B20 alloy and on its soft magnetic properties. In the amorphous ferromagnetic alloys, it is possible to indirectly determine the effect of the structure stresses, resulting from the presence of structural defects, on the soft magnetic properties of these materials. It has been found that a change in the parameters associated with the presence of structural defects affects the shape of the hyperfi ne fi eld distributions of 57Fe.
    Źródło:
    Nukleonika; 2015, 60, 1; 23-27
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase composition investigations of the Nd-Fe alloys processed by various methods
    Autorzy:
    Pawlik, K.
    Wysłocki, J.
    Olszewski, J.
    Bodak, O.
    Pawlik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147201.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Nd-Fe binary system
    intermetallic compounds
    Mössbauer spectroscopy
    phase composition
    Opis:
    Abstract In the paper, the phase composition changes for the series of Nd10+xFe90 x (x = 0; 0.5; 1; 1.5; 2; 2.5; 3; 3.5; 4) binary alloys, produced by long time annealing and rapid solidification methods were investigated. X-ray diffractometry and Mössbauer spectroscopy were used to determine the phase composition of the alloys. These structural investigations revealed the existence of two crystalline phases in the long time annealed samples: bcc á-Fe and rhombohedral Nd2Fe17 of the Th2Zn17-type structure. Furthermore, the single phase region was observed for the Nd concentration above 12 at.%. For the rapidly solidified ribbon samples, a low volume fraction of the alfa-Fe and the crystalline phase of hexagonal symmetry were detected.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 27-31
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The microstructure and magnetic properties of Nd8.5Tb1.5Fe83Zr1B6 ribbons obtained at various cooling rates
    Autorzy:
    Dośpiał, M.
    Olszewski, J.
    Nabiałek, M.
    Pietrusiewicz, P.
    Kaczmarzyk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147459.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    microstructure analysis
    Mössbauer spectroscopy
    permanent magnets
    reversal magnetization
    Opis:
    The paper presents results of microstructure and magnetic properties studies of Nd8.5Tb1.5Fe83Zr1B6 ribbons obtained by melt-spinning technique. The samples were produced using the rapid cooling of liquid alloy on the copper wheel, by applying three different linear velocities 20, 30, and 35 m/s. The microstructure of obtained ribbons was examined using X-ray diffractometry and Mössbauer spectroscopy. Magnetic measurements were performed using LakeShore vibrating sample magnetometer. The microstructure measurements were used for quantitative and qualitative analysis of phase composition. Basing on results of structure studies combined with magnetic measurements, the infl uence of phase composition on hysteresis loop behavior was described.
    Źródło:
    Nukleonika; 2015, 60, 1; 15-18
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine interaction and some thermomagnetic properties of amorphous and partially crystallized Fe70−xMxMo5Cr4Nb6B15 (M = Co or Ni, x = 0 or 10) alloys
    Autorzy:
    Rzącki, J.
    Świerczek, J.
    Hasiak, M.
    Olszewski, J.
    Zbroszczyk, J.
    Ciurzyńska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148195.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    amorphous alloys
    magnetic properties
    X-ray diffraction
    Curie temperature
    Opis:
    As revealed by Mössbauer spectroscopy, replacement of 10 at.% of iron in the amorphous Fe70Mo5Cr4Nb6B15 alloy by cobalt or nickel has no effect on the magnetic structure in the vicinity of room temperature, although the Curie point moves from 190 K towards ambient one. In the early stages of crystallization, the paramagnetic crystalline Cr12Fe36Mo10 phase appears before α-Fe or α-FeCo are formed, as is confi rmed by X-ray diffractometry and transmission electron microscopy. Creation of the crystalline Cr12Fe36Mo10 phase is accompanied by the amorphous ferromagnetic phase formation at the expense of amorphous paramagnetic one.
    Źródło:
    Nukleonika; 2015, 60, 1; 121-126
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Co, Ni, and Cr addition on microstructure and magnetic properties of amorphous and nanocrystalline Fe86−xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys
    Autorzy:
    Łukiewska, A.
    Świerczek, J.
    Hasiak, M.
    Olszewski, J.
    Zbroszczyk, J.
    Gębara, P.
    Ciurzyńska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/147169.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous materials
    nanocrystalline materials
    Mössbauer spectroscopy
    invar effect
    Curie temperature
    Opis:
    Mössbauer spectra and thermomagnetic curves for the Fe86-xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys in the as-quenched state and after the accumulative annealing in the temperature range 600–800 K for 10 min are investigated. The parent Fe86Zr7Nb2Cu1B4 amorphous alloy is paramagnetic at room temperature, and substitution of 6 at.% of Fe by Co, Ni, and CoCr changes the magnetic structure – the alloys become ferromagnetic, whereas replacing 6 at.% of Fe with Cr preserves the paramagnetic state. After the heat treatment at 600 K, the decrease of the average hyperfi ne fi eld induction, as compared to the as-quenched state, is observed due to the invar effect. After this annealing, the Curie temperature for all investigated alloys decreases. The accumulative annealing up to 800 K leads to the partial crystallization; α-Fe or α-FeCo grains with diameters in the range of 12–30 nm in the residual amorphous matrix appear.
    Źródło:
    Nukleonika; 2015, 60, 1; 103-108
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Mössbauer studies of single crystal gamma-Mn-Fe
    Autorzy:
    Szymański, K.
    Olszewski, W.
    Dobrzyński, L.
    Satuła, D.
    Jankowska-Kisielińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147239.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-Mn-Fe alloys
    iron alloys
    manganese alloys
    Mössbauer spectroscopy
    Opis:
    Mössbauer measurements were performed on single crystals gamma-Mn60Fe37Cu3 in an external field of 1.3 T at room temperature. The hyperfine field distribution can be described as a vector sum of the external and internal fields. In addition, anisotropic response of magnetic moments was detected. The anisotropy, due to Fe atoms, has Fe-rich surroundings.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 75-78
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine interactions in (Cr0.9957Fe0.01)3 + xSi1 - x
    Autorzy:
    Satuła, D.
    Szymański, K.
    Olszewski, W.
    Kalska-Szostko, B.
    Waliszewski, J.
    Rećko, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147344.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    A15 structure
    Cr-Fe-Si alloys
    Mössbauer spectroscopy
    X-ray diffraction
    Opis:
    X-ray diffraction measurements and Mossbauer spectroscopy with external magnetic field were carried out on (Cr0.99 57Fe0.01)3+xSi-x alloys. The Mossbauer spectra for A15 type of structure can be described by superposition of single line S(1) and two doublets D(1) and D(2). The relative ratio of the S(1) and D(2) strongly depends on x. The nearest neighbours of these components have been identified. It was shown that 57Fe atoms preferentially locate in Cr positions for x less-than or equal to 0.0, while for x greater 0.0 iron atoms are distributed both in Cr and Si positions. It was shown that, in A15 structure, one Cr atom located in the 57Fe nearest neighbours (n.n.) decreases isomer shift by (0.022 plus or minus 0.002) mm/s, while one Si in n.n. increases isomer shift by (0.09 plus or minus 0.01) mm/s. The measured Mossbauer spectra of bcc Cr-Si indicate that atoms are randomly distributed and can be well described as superposition of single lines, related to various local environments of 57Fe atoms.
    Źródło:
    Nukleonika; 2013, 58, 1; 73-76
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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