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    Wyświetlanie 1-6 z 6
    Tytuł:
    Magnetic transformation in Ni-Mn-In Heusler alloy
    Autorzy:
    Kuzma, M.
    Maziarz, W
    Stefaniuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146235.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ferromagnetic resonance
    Heusler alloy
    Ni-Mn-In
    Opis:
    Magnetic properties of a Ni50Mn35.5In14.5 Heusler ribbon were studied by ferromagnetic resonance (FMR) in the temperature range of 335–100 K. In the temperature region of 265–170 K, the FMR signal disappeared, in spite of the fact that this region comprised the main crystal transformation temperatures: Ms, Mf, As, Af. In the austenite crystal state, a weak antiferromagnetic interaction was observed, whereas ferromagnetism was detected in the low temperature martensitic state.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 435-438
    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:
    Production and separation of manganese-54 from alpha-irradiated V2O5 target
    Autorzy:
    Kłos, M.
    Bartyzel, M.
    Petelenz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146185.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ion-exchange chromatography
    sotope production
    54Mn
    48V
    cyclotron
    Opis:
    Our aim was to obtain and isolate the carrier-free gamma emitter, 54Mn. Manganese-54 was produced via cyclotron activation in the 51V(alfa,n)54Mn reaction, and separated from HCl solution on Dowex-50 . 8 resin. The effectiveness of chemical separation was checked using the internal tracer 48V, produced in a cyclotron via the natTi(p,xn)48V reaction. The microcomponent 54Mn was eluted from the column with 3 M HCl, and vanadium with a 0.1 M HCl/ethanol/H2O2 mixture. The pair Ti/48V was separated on Dowex-50 . 8, using 0.03 M HClO4 as the eluent for 48V and 1 M HClO4 for natTi. The carrier-free 54Mn was of 99.9% radionuclide purity. In separation of the carrierfree pair 54Mn/48V, the recovery yield was 98.7% for 54Mn and 96.4% for 48V.
    Źródło:
    Nukleonika; 2006, 51, 4; 221-224
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper-manganese-zinc spinels in zeolites : study of EMR spectra
    Autorzy:
    Decyk, P.
    Więckowski, A. B.
    Najder-Kozdrowska, L.
    Bilkova, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146776.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Cu-Mn-Zn spinels
    electron magnetic resonance
    paramagnetic complexes
    Y zeolites
    Opis:
    The aim of this study is the application of electron magnetic resonance (EMR) spectroscopy to determine the interactions between NaY and HY zeolites and Cu-Mn-Zn spinels loaded onto the zeolite surfaces. The materials were characterized using XRD and IR spectroscopies. Four types of EMR lines were observed for Cu-Mn-Zn/NaY, Cu-Mn-Zn/HY samples. The difference between the EMR spectra recorded at 77 and 293 K has been shown. The spectra recorded at 77 K allowed us to distinguish between the species formed on NaY and HY zeolites. The EMR spectrum of Cu-Mn-Zn/NaY recorded at 77 K showed only one line attributed to antiferromagnetic spinels Cu1.4Mn1.6O4 and ZnMn2O4 or/and Cu0.5Zn0.5Mn2O4. The spinels appeared to be more stable (more strongly attached) on HY zeolite than on NaY one. It was proved that different strength of interactions between the zeolites and Cu-Mn-Zn spinels was caused by differences in the acidity of NaY and HY zeolites.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 423-428
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implanted manganese redistribution in Si after He+ irradiation and hydrogen pulse plasma treatment
    Autorzy:
    Werner, Z.
    Pochrybniak, C.
    Barlak, M.
    Piekoszewski, J.
    Korman, A.
    Heller, R.
    Szymczyk, W.
    Bocheńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147018.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dilute magnetic semiconductors (DMS)
    Mn-implanted Si
    ion beam induced epitaxial crystallization
    Opis:
    Si-Mn alloy with a Mn content of a few percent is potentially a candidate for room temperature (RT) dilute magnetic semiconductor (DMS). However, the present methods of material manufacture suffer from problems with poor Mn solubility and thermodynamical limitations. We study a non-equilibrium method in which silicon is first implanted with 160 keV manganese ions to a dose of 1 × 1016 ions/cm2 and next either irradiated with 1.5 MeV 4He+ ions from the Warsaw Van de Graaff accelerator at 400°C or treated with high-energy hydrogen plasma pulses. Conclusion from Rutherford backscattering spectrometry (RBS) examination of the samples is that both approaches lead to recovery of crystalline surface layer with manganese occupying off-substitutional sites. The potential development of the method is discussed.
    Źródło:
    Nukleonika; 2011, 56, 1; 5-8
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR spectroscopy of Cu2+ and Mn2+ in borate glasses
    Autorzy:
    Drzewiecki, A.
    Padlyak, B.
    Adamiv, V.
    Burak, Y.
    Teslyuk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/147654.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    borate glasses
    Cu2+ paramagnetic centre
    electron paramagnetic resonance (EPR) spectroscopy
    hyperfine structure
    Mn2+ paramagnetic centre
    Opis:
    Electron paramagnetic resonance (EPR) spectra of the CaB4O7 and LiCaBO3 glasses containing 0.5 and 1.0 mol.% CuO and MnO2 impurity compounds were investigated at room temperature. The glasses with CaB4O7:Cu, LiCaBO3:Cu, CaB4O7:Mn and LiCaBO3:Mn compositions were produced from the corresponding polycrystalline compounds using standard glass synthesis and technological conditions developed by the authors. The EPR spectral parameters of the Cu2+ and Mn2+ centres in both glasses containing 0.5 and 1.0 mol.% CuO and MnO2 doping oxides were determined. Analysis of EPR spectral parameters shows that Cu impurity is incorporated into the CaB4O7 and LiCaBO3 glass network as isolated Cu2+ (3d9, 2D5/2) paramagnetic ions. The Cu2+ ions occupy Ca(Li) sites of the borate glass network coordinated by six O2− anions with geometry of elongated octahedron (D4h symmetry) due to the Jahn- -Teller effect. The EPR spectra of the Mn-doped CaB4O7 and LiCaBO3 glasses are virtually identical and typical of all oxide glasses activated with Mn2+ (3d5, 6S5/2) ions. Observed EPR spectra in the Mn-doped glasses were attributed to isolated Mn2+ (1) centres (geff ≅ 4.3) in octahedral Ca(Li) sites with a strong (fully) rhombic distortion, isolated Mn2+ (2) centres (geff ≅ 2.0) in octahedral Ca(Li) sites with nearly cubic local symmetry as well as pairs and small clusters of the Mn2+ ions, coupled by magnetic dipolar and exchange interactions. On the basis of the obtained results and analysis of referenced data, the local structure of the Cu2+ and Mn2+ centres in the borate glasses have been proposed.
    Źródło:
    Nukleonika; 2013, 58, 3; 379-385
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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