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Wyświetlanie 1-15 z 19
Tytuł:
Applications of Mössbauer Spectroscopy to Studies of Quasicrystals
Autorzy:
Stadnik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1811574.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.50.Lk
76.80.+y
Opis:
A review is presented of the application of the Mössbauer spectroscopy to the study of quasicrystals. The usefulness of the Mössbauer spectroscopy to solving the atomic structure of a complex icosahedral system is illustrated. The role of the Mössbauer spectroscopy in studies of magnetism of quasicrystals is discussed. The Mössbauer spectroscopy results on phason dynamics in quasicrystals are reviewed.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1475-1482
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Investigation of Rapidly Quenched FeCoPtB Alloys
Autorzy:
Grabias, A.
Latuch, J.
Oleszak, D.
Kopcewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506648.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.50.Kj
76.80.+y
Opis:
Two sets of $Fe_{52-x}Co_{x}Pt_{28}B_{20}$ (x=0-26 at.%) and $Fe_{60-x}Co_{x}Pt_{25}B_{15}$ (x=0-40 at.%) alloys were prepared in the form of ribbons by the rapid quenching technique. Structure of the samples was characterized by Mössbauer spectroscopy and X-ray diffraction. In the as-quenched alloys the amorphous phase coexisted with the fcc-(Fe,Co)Pt disordered solid solution. Differential scanning calorimetry measurements performed in the range 50-720 °C revealed one or two exothermal peaks. The magnetically hard ordered $L1_{0}$ (Fe,Co)Pt and magnetically soft $(Fe,Co)_{2}B$ nanocrystalline phases were formed due to thermal treatment of the alloys. The influence of Co content on the structure of the as-quenched and heated alloys was studied.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 68-71
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Curie Temperature of Amorphous Ferromagnets of Type Fe-TM-M
Autorzy:
Nowakowska, E.
Oleniacz, J.
Zych, W.
Dudek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1967902.pdf
Data publikacji:
1997-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
76.80.+y
75.50.Bb
Opis:
The theoretical Heisenberg model of an amorphous ferromagnet having two magnetic components in the Bethe-Peierls-Weiss approximation was applied to study the concentration dependence of the Curie temperature of the Fe-TM-M alloys (TM - transition metal, M - metalloid). The analysis of the experimental data in comparison with the model calculations was performed.
Źródło:
Acta Physica Polonica A; 1997, 92, 3; 569-576
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Effects in Fe-Based Nanocrystalline Alloys
Autorzy:
Ślawska-Waniewska, A.
Brzózka, K.
Greneche, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1953187.pdf
Data publikacji:
1997-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
61.16.Bg
75.50.Kj
Opis:
The microstructural and Mossbauer investigations of FeZrBCu nanocrystalline alloy are presented. The results obtained indicate that fine bcc-Fe grains do possess identifiable surface properties which arise from the symmetry restriction at grain boundary.
Źródło:
Acta Physica Polonica A; 1997, 91, 1; 229-232
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Stability and Crystallization οf Iron and Cobalt - Based Bulk Amorphous Alloys
Autorzy:
Olszewski, J.
Zbroszczyk, J.
Sobczyk, K.
Ciurzyńska, W.
Brągiel, P.
Nabiałek, M.
Świerczek, J.
Hasiak, M.
Łukiewska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811616.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.50.Bb
76.80.+y
Opis:
Microstructure by the Mössbauer spectroscopy and approach to magnetic saturation in the bulk amorphous $Fe_{61}Co_{10}Me_7Y_2B_{20}$ ($Me_7$=$Y_7$, $Y_6Ti_1$ or $Zr_{2.5}Hf_{2.5}W_2$) alloys are investigated. The bulk amorphous $Fe_{61}Co_{10}Zr_{2.5}Hf_{2.5}W_2Y_2B_{20}$ alloy exhibits the best thermal stability and remains amorphous up to 901 K. Moreover, the quasi-dislocations dipoles present in this amorphous alloy have the largest width equal to 6.7 nm. After annealing this alloy below the crystallization temperature the enhancement of both the average hyperfine field and its standard deviation is observed which points to the increase in the atom packing density due to the decay of quasi-dislocation dipoles. After the annealing at 901 K the small amount of the crystalline α-FeCo phase is presented in this alloy. The same crystalline phase appears in the bulk $Fe_{61}Co_{10}Y_8Ti_1B_{20}$ and $Fe_{61}Co_{10}Y_9B_{20}$ alloys after annealing at 750 K and 840 K, respectively.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1659-1666
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer Study of Magnetic Texture of Finemet-Type Ribbons
Autorzy:
Brzózka, K.
Sovák, P.
Górka, B.
Szumiata, T.
Gawroński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506573.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.50.Kj
81.40.Ef
Opis:
Magnetic texture of amorphous Finemet-type alloys substituted by Co, Ni, Mn, Ge and V was investigated by means of Mössbauer spectroscopy using various angular configurations. Samples in form of ribbons were manufactured by single-roller melt spinning technique. In most of investigated alloys some preference of alignment of atomic magnetic moments in-plane of sample is stated, except of some alloys substituted by germanium in which slight tendency to out-of plane spin orientation is proved.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 33-36
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer Study of Nanocrystalline Alloys
Autorzy:
Kopcewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2010990.pdf
Data publikacji:
1999-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.50.Kj
75.50.Bb
81.40.-z
Opis:
The current status of the Mössbauer investigations of the soft magnetic nanocrystalline alloys produced by utilizing the first step of crystallization of the amorphous alloys such as FeCuNbSiB and FeZrBCu is reviewed. Conventional Mössbauer measurements allow the identification of phases formed due to annealing of the amorphous precursor and the evaluation of their relative content. The unconventional rf-Mössbauer technique, in which the rf collapse and sideband effects are employed, permits us to distinguish the magnetically soft nanocrystalline bcc-Fe phase from the magnetically harder microcrystalline Fe. Qualitative information concerning the distribution of anisotropy fields in the nanocrystalline grains can be inferred from the dependence of the rf collapsed spectra on the rf field intensity. The rf-sidebands effect reveals strong reduction of magnetostriction due to the formation of the nanocrystalline phase. The rf-Mössbauer technique provides a unique opportunity to study the microstructure and magnetic properties of each phase formed in the amorphous precursor.
Źródło:
Acta Physica Polonica A; 1999, 96, 1; 49-68
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmission and Conversion Electron Mössbauer Study of Crystallization of Amorphous FeZrB Alloys
Autorzy:
Grabias, A.
Kopcewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2011003.pdf
Data publikacji:
1999-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.50.Kj
75.50.Bb
81.40.-z
Opis:
The combined conversion electron emission and γ-transmission Mössbauer spectroscopy are used to investigate the differences in the bulk and surface crystallization of the amorphous FeZrB alloy in which the nanocrystalline bcc-Fe phase was formed due to annealing. The measurements were performed for the ribbons in the as-quenched state, after 1 h annealing at 430-600°C and after short time annealing at 600°C. The clear differences in the surface and bulk crystallization behaviours were detected. Not only the surface crystallization starts at lower annealing temperature than the bulk one, but additional phases were detected at the surface which do not form in the bulk. Structural transformations as a function of annealing time (15-120 s) are compared with those induced by 1 h anneals. The enhanced surface crystallization was attributed to the boron depletion of the surface region which leads to the decrease in the crystallization temperature at the surface.
Źródło:
Acta Physica Polonica A; 1999, 96, 1; 123-130
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Ion Irradiated Fe₇₅Mo₈Cu₁B₁₆ Metallic Glass
Autorzy:
Hasiak, M.
Miglierini, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032745.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
75.30.Sg
76.80.+y
Opis:
Microstructure and thermomagnetic properties of ion-bombarded amorphous Fe₇₅Mo₈Cu₁B₁₆ alloy are investigated. The Mössbauer spectroscopy shows that surface regions at the air side of the ribbons irradiated with 2×10¹⁶ ions/cm² were significantly affected by 130 keV N⁺ ions. On the other hand, the opposite (wheel) side that was not exposed to ion irradiation is practically intact. The analysis of temperature dependences of magnetization shows the Curie points of 313 K and 316 K for as-quenched and irradiated samples, respectively. The maximum of magnetic entropy change calculated for the irradiated alloy in a magnetic field of 1.0 T occurs at 312.5 K and equals to 0.77 J kg¯¹ K¯¹ while that of the as-quenched sample is 0.74 J kg¯¹ K¯¹.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 768-770
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thickness Dependence of Mössbauer Parameters for Fe₇₈Si₉B₁₃ Metallic Glass Ribbons
Autorzy:
Amini, N.
Miglierini, M.
Hasiak, M.
Dekan, J.
Habibi, S.
Powiązania:
https://bibliotekanauki.pl/articles/1032172.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
75.75.-c
76.80.+y
Opis:
Changes in magnetic microstructure of Fe₇₈Si₉B₁₃ ribbons were investigated by the Mössbauer spectrometry as a function of their thickness. The latter decreases inversely with the quenching wheel velocity. Amorphicity of the samples was checked by X-ray diffraction and the Mössbauer spectrometry. Average values of hyperfine magnetic fields do not appreciably differ with the production velocity. On the other hand, notable deviations are observed in the position of a net magnetic moment. After annealing with moderate temperature, the magnetic anisotropy improves as indicated by an increase of the average value of hyperfine magnetic field. However, magnetic moments turn out of the ribbon plane and this process continues towards higher production velocity, i.e., smaller thickness of the ribbons. No appreciable deviations in the investigated Mössbauer parameters were revealed after annealing during different time intervals.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 666-668
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CEMS and RF-Mössbauer Study of Nanocrystalline Fe$\text{}_{81}$Zr$\text{}_{7}$B$\text{}_{12}$ Alloy
Autorzy:
Kopcewicz, M.
Grabias, A.
Nowicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/1953186.pdf
Data publikacji:
1997-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
81.40.-z
75.50.Bb
75.50.Kj
Opis:
The combined conversion electron (CEMS) and γ-transmission Mossbauer spectroscopy is used to investigate the differences in the bulk and surface crystallization of the amorphous Fe$\text{}_{81}$Zr$\text{}_{7}$B$\text{}_{12}$ alloy. The radio-frequency induced effects (rf collapse and side bands) are used to study the microstructure and magnetic behaviour of the alloy in the amorphous and nanocrystalline states. Rf-Mossbauer experiment permits us to distinguish soft magnetic nanocrystalline bcc-Fe phase from microcrystalline α-Fe.
Źródło:
Acta Physica Polonica A; 1997, 91, 1; 225-228
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Si Content on the Surface Magnetic Properties of $Fe_{80}Si_{x}B_{20 - x}$ Metallic Glasses (x = 6, 10)
Autorzy:
Životský, O.
Jirásková, Y.
De Grave, E.
Hrabovská, K.
Hendrych, A.
Klimša, L.
Powiązania:
https://bibliotekanauki.pl/articles/1506998.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.50.Kj
75.70.Kw
76.80.+y
Opis:
The surface sensitive magneto-optical Kerr effect methods and conversion as well as integral low-energy electron Mössbauer spectroscopy are used to compare the surface magnetic and microstructural properties of two Metglas alloys with compositions $Fe_{80}Si_6B_{14}$ and $Fe_{80}Si_{10}B_{10}$. It is shown that the samples differ markedly both in the Mössbauer spectra and the surface hysteresis loops. While the ribbon with lower amount of Si is amorphous and characterized by three contributions corresponding to clusters with prevailing content of Fe and Si atoms, to clusters of mainly Fe and B atoms, and regions in between, the surface of the second sample is partially crystallized into bcc-FeSi crystals embedded in the residual amorphous matrix.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 751-753
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystallization of the Amorphous Fe$\text{}_{14}$Ni$\text{}_{40}$Zr$\text{}_{7}$B$\text{}_{12}$ Alloys Studied by the Mössbauer Spectroscopy
Autorzy:
Kopcewicz, M.
Idzikowski, B.
Kalinowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/2035517.pdf
Data publikacji:
2002-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.50.Kj
75.50.Bb
81.40.-z
Opis:
Formation of the soft magnetic nanostructure in amorphous Fe$\text{}_{41}$Ni$\text{}_{40}$Zr$\text{}_{7}$B$\text{}_{12}$ alloy due to heat treatment is studied by the Mössbauer, differential scanning calorimetry, and X-ray diffraction techniques. Annealing at temperatures 520-580ºC leads to the formation of extremely soft nanocrystalline alloy as revealed by the rf-Mössbauer measurements. The superparamagnetic behaviour was observed for the alloy annealed at 620-640ºC. At higher annealing temperatures good soft magnetic properties deteriorate.
Źródło:
Acta Physica Polonica A; 2002, 102, 2; 301-307
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Field Magnetic Properties of FeCo-Based Alloys
Autorzy:
Hasiak, M.
Miglierini, M.
Łukiewska, A.
Kaleta, J.
Zbroszczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1378307.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.50.Kj
75.60.Lr
71.55.Jv
Opis:
Low field magnetic properties of amorphous $(Fe_{x}Co_{1})_{76}Mo_{8}Cu_{1}B_{15}$ alloys (x=3, 6 and 9) were characterized by magnetic after-effect and initial magnetic susceptibility. Activation energies and pre-exponential factors of the Arrhenius law that were derived from the disaccommodation curves are of about 1.188 eV and $10^{-15}$ s, respectively. Local magnetic arrangement was investigated by $\text{}^{57}Fe$ Mössbauer spectrometry. The average hyperfine magnetic field decreases with increasing Fe/Co ratio due to smaller relative contribution of cobalt. The overall magnetic parameters of the alloy prove its good soft magnetic properties with an application potential.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 118-119
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer Study of Mechanosynthesized and Thermally Treated Co-Fe-Ni Alloys
Autorzy:
Pikula, T.
Oleszak, D.
Pękała, M.
Mazurek, M.
Żurawicz, J.
Jartych, E.
Powiązania:
https://bibliotekanauki.pl/articles/1811586.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
75.50.Kj
76.80.+y
75.60.Ej
Opis:
Mechanical alloying was used to prepare $Co_{40}Fe_{60}$, $Co_{60}Fe_{35}Ni_{5}$, $Co_{40}Fe_{45}Ni_{15}$, and $Co_{40}Fe_{35}Ni_{25}$ alloys from the elemental powders. As X-ray diffraction studies proved the final products of milling were the solid solutions with bcc or fcc lattice and the average grain size between 20 and 50 nm. After heating of the alloys up to 993 K, the mixtures of two solid solutions with bcc and fcc lattices were formed in the case of Co-Fe-Ni alloys. Thermal treatment did not influence the type of the lattice of $Co_{40}Fe_{60}$ alloy. The Mössbauer spectroscopy revealed hyperfine magnetic field distribution ranged from 33 to 38 T for $Co_{40}Fe_{60}$ alloy and from 30 to 37 T for Co-Fe-Ni alloys. In the case of two-phase alloys, distributions were decomposed into two simple Gaussian functions using the numerical fitting. Magnetic measurements allowed to determine the effective magnetic moments and the Curie temperatures of the obtained alloys.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1545-1553
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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