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    Wyświetlanie 1-9 z 9
    Tytuł:
    Isobaric Thermal Expansion and Isothermal Compression of Powdered NiFe Based Alloys Studied by In-Situ EDXRD
    Autorzy:
    Olekšáková, D.
    Füzer, J.
    Kollár, P.
    Bednarčík, J.
    Lathe, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1200812.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    61.05.cp
    Opis:
    The aim of the present work was to study the isothermal compression and isobaric thermal expansion behaviour of ball-milled NiFe (81 wt.% of Ni) and NiFeMo (79 wt.% of Ni, 16 wt.% of Fe) alloy and follow its phase evolution when exposed to high pressure and temperature. In-situ pressure-temperature energy dispersive X-ray (EDXRD) diffraction experiments were performed at the MAX80 instrument (beamline F2.1). The compressibility of NiFe alloy at 400 °C was evaluated for pressure values of up to 3.5 GPa. The EDXRD spectra revealed the presence of cubic FeNi_{3} phase as determined from the shift of (111), (200) and (220) reflection lines in corresponding EDXRD spectra.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 128-129
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Magnetic Properties οf $Fe_{3-x}Ti_xSn$ Disordered Alloys
    Autorzy:
    Brzakalik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811583.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.50.Bb
    76.80.+y
    Opis:
    A series of $Fe_{3-x}Ti_xSn$ disordered alloys (where x = 0, 0.25, 0.5, and 0.75) obtained by arc-melting were studied. Directly after the melting all samples were mechanically crashed and in that form examined by the X-ray diffraction and Mössbauer effect methods. In $Fe_{3-x}Ti_xSn$ alloy with x = 0 three phases exist: FeSn (B35), $FeSn_2$ (C16) and Fe(Sn) (A2). The contributions of these phases decrease very fast in aid of ternary Fe-Ti-Sn alloys with the B2 and $D0_3$/$L2_1$ types of structure, as Ti atoms concentration increases. It was shown that these ternary alloys consist of four distinct Fe-Ti-Sn phases with contributions depending on the value of the x parameter. The value of hyperfine magnetic field $(B_{hf})$ parameter at the Fe nuclei is equal to about 110 kG for FeSn and $FeSn_2$ phases. However in alloys with A2, B2 and $D0_3$/$L2_1$ type of structure this value changes from 0 kG to 335 kG and can be considered (in the first approximation) as a function of Fe atoms number in the nearest neighborhood.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1529-1536
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Study and Crystallization Behaviour of $Fe_{62-x} Co_x Nb_8 B_{30}$ Metallic Glasses (x=0, 20)
    Autorzy:
    Babilas, R.
    Kądziołka-Gaweł, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398363.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    64.70.pe
    75.50.Bb
    75.50.Kj
    Opis:
    The paper presents the structural analysis of $Fe_{62-x} Co_x Nb_8 B_{3-}$ metallic glasses (x=0, 20) in as-cast and after crystallization state. The studies were performed on metallic glasses of ribbon form: with thickness of 0.05 and 0.06 mm. The structure analysis of the samples in as-cast state and phase analysis of studied alloys after annealing was carried out by the X-ray diffraction methods. Moreover, the Mössbauer spectroscopy was also used to investigate the local structure for examined alloys. The soft magnetic properties examination covered the initial magnetic permeability. The after-effects of magnetic permeability were also conducted.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 901-904
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Study on Local Atomic Structure in $Fe_{80-x}Nb_xB_{20}$ (x=4, 6) Metallic Glasses
    Autorzy:
    Babilas, R.
    Kądziołka-Gaweł, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398812.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    64.70.pe
    75.50.Bb
    75.50.Kj
    Opis:
    Fe-based amorphous alloys were prepared by the melt-spinning technique and characterized by X-ray diffraction and transmission Mössbauer spectroscopy. The studies were performed on Fe₇₆Nb₄B₂₀ and Fe₇₄Nb₆B₂₀ metallic glasses in the form of ribbons. The Mössbauer spectroscopy allows to study the local environments of the Fe atoms in the glassy state, showing the changes in the amorphous structure due to the changing of Nb addition. The obtained Mössbauer spectra of ferromagnetic metallic glasses present broad lines resulting from the distribution of non-equivalent iron sites and of interatomic distances. Variation of Nb content in the alloys affects the disorder in as-cast state and also influences on the average radius of the first coordination shell and the number of nearest neighbor Fe atoms.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 190-192
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of $Ni_3Fe$ Nanoparticles Prepared by Chemical Method
    Autorzy:
    Zábranský, K.
    Schneeweiss, O.
    Pizůrová, N.
    David, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1507208.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.46.-w
    75.20.En
    75.50.Bb
    Opis:
    $Ni_3Fe$ nanoparticles prepared by calcination of the iron-nickel oxalate were investigated by X-ray diffraction, Mössbauer spectroscopy and magnetic measurements. The high temperature X-ray diffraction shows two stages of transformation of oxalate: (i) amorphization and (ii) formation of nanocrystalline $Ni_3Fe$ particles. The development of coercivity, magnetization and mean coherence length ( ≈ particle size) is discussed.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 785-786
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Nb Atoms on the Crystallization Process of Fe-B-Nb Amorphous Alloys
    Autorzy:
    Babilas, R.
    Kądziołka-Gaweł, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387207.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    64.70.pe
    75.50.Bb
    75.50.Kj
    Opis:
    The ferromagnetic Fe-based amorphous alloys have been studied due to the attractive properties for soft magnetic applications. Depending on different Nb concentration, we studied the formation of crystalline phases in annealed samples of amorphous metallic alloys for $Fe_{80-x}B₂₀Nbₓ$ (x=0, 4, 10). The nature of the crystallization products as well as the phase structure were determined by using the Mössbauer spectrometry combined with X-ray diffraction and differential scanning calorimetry results. Substitution of Fe atoms by Nb lead to significant changes in hyperfine magnetic field $(B_{hf})$ distributions in as-quenched amorphous alloys $Fe_{80-x}B₂₀Nbₓ$, for x=10 the minimal value of $B_{hf}$ is observed. Addition of this element causes shift of crystallization process towards higher temperatures and induces formation of phase complex including the α -Fe, Fe₂B and Fe₃B. Combination of X-ray diffraction and Mössbauer spectroscopy is very useful method in studying the structural environment of Fe atoms on a nearest-neighbor length scale.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 573-575
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Bulk and Thin Nd₂Fe₁₄B Films after Corrosion Action
    Autorzy:
    Constantin, V.
    Neacşu, E.
    Popescu, A.
    Galyas, A.
    Demidenko, O.
    Yanushkevich, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385675.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.50.Bb
    75.50.Vv
    75.70.-i
    Opis:
    The corrosion action for bulk and thin Nd₂Fe₁₄B films magnets in different corrosion media was studied. The thin Nd-Fe-B films of 100 nm ≤ d ≤ 1000 nm were deposited on glass substrate by "flash" evaporation method. The structure and microstructure of the samples were studied by X-ray diffraction analysis, scanning electron microscopy. The temperature dependence of the magnetization before and after corrosion action was carried out by ponderomotive method in the temperature range 80 ≤ T ≤ 800 K. It is shown that the specific magnetizations of the thin Nd-Fe-B films with d ≥ 1000 nm are comparable to those measured for the powder samples. The values of the coercive and saturation fields were determined from the hysteresis loops measurements.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 368-370
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Iron Nanoparticles by Selective Leaching Method
    Autorzy:
    Michalcová, A.
    Vojtěch, D.
    Kubatík, T.
    Stehlíková, K.
    Brabec, F.
    Marek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402107.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.J-
    61.05.cp
    75.50.Bb
    81.40.-z
    81.07.Bc
    Opis:
    Iron nanoparticles were prepared by selective leaching method. Initially the rapidly solidified AlFe11 alloy was prepared and consequently the aluminium matrix was dissolved from this alloy in 20% NaOH solution. This process was carried out at 0 and 80°C. At lower temperature, the iron nanoparticles covered by thin layer of Fe(OH)₃ were successfully obtained. The size of formed nanoparticles was about 8 nm and the particles exhibited massive agglomeration. It is not limitation of the process, because the application of nanoparticles is as a precursor for production of bulk nanocrystalline materials (metals, alloys and metal matrix composites). At higher temperature, the selective leaching process failed and iron was oxidized to different hydroxides. Aluminium containing waste liquid from selective leaching was used for production of powder Al₂O₃. Initial alloys and products were characterized by X-ray diffraction, scanning electron microscopy, and high resolution transmission electron microscopy.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 640-642
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and magnetic properties of MBE grown (Fe/Pt) (111) multilayers
    Autorzy:
    Marynowska, A.
    Dynowska, E.
    Lewińska, S.
    Seki, T.
    Takanashi, K.
    Kanak, J.
    Pietruczik, A.
    Aleszkiewicz, P.
    Wawro, A.
    Ślawska-Waniewska, A.
    Baczewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1058152.pdf
    Data publikacji:
    2016-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    61.05.jh
    68.35.bd
    68.35.Ct
    68.37.Ef
    68.37.Ps
    68.65.Ac
    75.50.Bb
    75.70.Ak
    Opis:
    Series of Al₂O₃(0001)/Pt/(Fe/Pt)ₙ/Pt multilayers with variable number of bilayers n and thicknesses of individual layers were grown using molecular beam epitaxy to investigate influence of buffer layer structure, number of bilayers, and individual layer thickness on their structural and magnetic properties. Both columnar and monocrystalline 10 nm Pt (111) buffer layers were used in the experiment. Structure of Pt buffer layer determined the roughness of Fe/Pt interfaces and consequently magnetic properties of the multilayers. When multilayers were deposited on columnar Pt buffer layer, we observed increase of Fe/Pt interfaces roughness with increasing number of bilayers to values exceeding the nominal Fe/Pt bilayer thickness in the upper part of the sample volume, which resulted in the increment of coercivity in the sample with n=15 determined from hysteresis loops measured for perpendicular orientation of magnetic field. When Fe/Pt multilayers were deposited on monocrystalline Pt buffer layer, Fe/Pt interfaces were smooth regardless the number of bilayers. All samples, despite of the quality of buffer layer, number of bilayers, and individual layer thickness revealed easy magnetisation axis oriented in the sample plane.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 6; 1363-1370
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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