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Wyświetlanie 1-15 z 183
Tytuł:
Wstępne wyniki pomiarów mössbauerowskich próbki meteorytu Pułtusk otrzymanych w temperaturze pokojowej (300 K) oraz temperaturze ciekłego azotu (80 K)
Preliminary results of Mössbauer measurements of Pułtusk meteorite performed at room temperature (300 K) and at temperature of liquid nitrogen (80 K)
Autorzy:
Duda, Przemysław
Kazulo, Paweł
Setniewski, Adrian
Bogusz, Patrycja
Woźniak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1033101.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Mössbauer spectroscopy
Pultusk meteorite
Opis:
Mössbauer measurements of one sample of the Pułtusk meteorite were performed at room temperature (300 K) and at temperature of liquid nitrogen (80 K). Following mineralogical phases were identified in Mössbauer spectra: olivine, pyroxene, troilite, kamacite, taenite, and a doublet associated with ferric iron. The differences in the percentage of spectral areas obtained for all subspectra are very small. It means that in the range of these temperatures the Debye–Waller factor is the same for all mineralogical phases present in the investigated sample.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2018, 9; 48-53
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase constitution of an LaFe11.0Co0.8(Si0.4Al0.6)1.2 alloy investigated by Mössbauer spectroscopy
Autorzy:
Gębara, P.
Pawlik, P.
Wysłocki, J. J.
Szwaja, M.
Powiązania:
https://bibliotekanauki.pl/articles/147912.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
magnetocaloric materials
Mössbauer spectroscopy
Opis:
In the present work the phase constitution and magnetic ordering of the magnetocaloric LaFe11.0Co0.8(Si0.4Al0.6)1.2 alloy in the as-cast state and after annealing at 1323 K for 1 h (in case of ribbons) and 49 days (in case of bulk) were studied. For bulk and ribbon samples in as-cast state three crystalline phases were identified: dominant ferromagnetic alfa-Fe, minor ferromagnetic La(Fe,Co)Si and traces of paramagnetic La(Fe,Si)13 phase. Appropriate heat treatment resulted in the evolution of phase constitution of the alloy, where two crystalline phases were developed: the dominant paramagnetic La(Fe,Si)13 phase and a minor fraction of the ferromagnetic alfa-Fe for both bulk and ribbon samples.
Źródło:
Nukleonika; 2013, 58, 1; 113-116
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer studies of spin reorientations in Er2-xGdxFe14B
Autorzy:
Wojciechowska, A.
Bogacz, B.
Pędziwiatr, A.
Powiązania:
https://bibliotekanauki.pl/articles/147233.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
spin reorientation
Opis:
The Er2 xGdxFe14B (x = 0.5, 1.0, 1.5) polycrystalline compounds have been investigated with 57Fe Mössbauer spectroscopy in the 80 330 K temperature range. The spin reorientation phenomena (changes from planar to axial spin arrangements) have been studied extensively by a narrow step temperature scanning in the neighbourhood of the spin reorientation temperature. From the analysis of the spectra it was deduced that in the region of transition each subspectrum was split into two Zeeman sextets, which were characterized by different hyperfine magnetic fields and quadrupole splittings. A consistent way of describing the Mössbauer spectra in the wide range of temperatures was proposed. The composition and temperature dependencies of hyperfine interaction parameters and subspectra contributions were derived from experimental spectra. The transition temperatures were determined for all the compounds studied.
Źródło:
Nukleonika; 2004, 49,suppl.3; 71-73
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
57Fe Mössbauer study of stilpnomelane and associated chlorite from Polish granite pegmatites
Autorzy:
Malczewski, D.
Popiel, E.
Sitarek, A.
Powiązania:
https://bibliotekanauki.pl/articles/147222.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
stilpnomelane
chlorite
Mössbauer spectroscopy
Opis:
This paper reports the results of 57Fe Mössbauer study of stilpnomelane K0.6Fe6(Si8Al)(O,OH)27 .2H2O from Żółkiewka (Lower Silesia, Poland). Stilpnomelane in paragenesis with chlorite, tourmaline, claevelandite and zeolites has been found in granite pegmatites in quarries at Żółkiewka. The samples of naturally weathered stilpnomelane and chlorite from the same fragment of rock were also studied. The Mössbauer spectrum of an untreated sample could be fitted to two Fe2+ doublets and two Fe3+ doublets. The Fe2+ doublets have similar isomer shifts, but they distinctly differ in values of quadrupole splittings. Ferric iron, octahedrally coordinated occurs in three different environments represented by two doublets. The first of them, assigned to combined M1 + M2 positions and the second one assigned to M3 site with parameters IS = 0.36 mm/s and QS = 2.07 mm/s is visible in the spectra up to 880°C. This doublet is characteristic of stilpnomelane and can be regarded as a "fingerprint" of this mineral. After heating at 200°C, the relative content of Fe2+, ÓFe2+/ÓFe, decreases to 0.22 what means a 50% decrease in comparison to the initial value observed in the untreated sample. At about 1000°C, complete breakdown of the stilpnomelane structure takes place and the Mössbauer spectrum consists of two sextets and two ferric doublets. Abnormally high content of Fe2+ in naturally weathered stilpnomelane (0.70) comparing to the untreated sample of stilpnomelane (0.45) indicates that the sample had to be subjected to hydrothermal processes operating locally. Almost the same contents of divalent iron and hyperfine parameters of Fe2+ and Fe3+ doublets in weathered stilpnomelane and associated chlorite suggest that the process of chlorite transformation into stilpnomelane seems to be very probable.
Źródło:
Nukleonika; 2004, 49,suppl.3; 43-48
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of iron oxide magnetic nanoparticles
Autorzy:
Surowiec, Z.
Budzyński, M.
Durak, K.
Czernel, G.
Powiązania:
https://bibliotekanauki.pl/articles/147402.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
superparamagnetic nanoparticles
Opis:
Small particles of magnetite, i.e. 7.5, 13.4 and 14.1 nm in diameter, were obtained by the method of co-precipitation. The crystal structure and size distributions were determined by means of transmission electron microscopy and X-ray diffraction. The magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy within the temperature range from 3 K to room temperature (RT). The Mössbauer study of magnetic nanoparticles reveals relaxation behaviour related to the existence of the superparamagnetic phase. The blocking temperature depends on the sizes of the nanoparticles and the ammonia concentration.
Źródło:
Nukleonika; 2017, 62, 2; 73-77
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin reorientation phenomena in Er2-xRxFe14B (R = Gd, Th) – Mössbauer and calorimetric study
Autorzy:
Wojciechowska, A.
Pędziwiatr, A.
Bogacz, B.
Wróbel, S.
Powiązania:
https://bibliotekanauki.pl/articles/148335.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
spin reorientation
Opis:
The Er2 xGdxFe14B (x = 0.5, 1.0, 1.5) and Er2 xThxFe14B (x = 0.0, 0.5, 1.0, 1.5, 2.0) polycrystalline compounds have been investigated with 57Fe Mössbauer spectroscopy and differential scanning calorimetry (DSC). A comparison of results related to spin reorientation phenomena obtained for Gd- and Th-substituted compounds is presented in this paper. Spin reorientation phenomena (changes from planar to axial spin arrangements) have been studied extensively by a narrow step temperature scanning in the neighbourhood of the spin reorientation temperature, TSR. From the analysis of Mössbauer spectra, it was deduced that in the region of transition each subspectrum was split into two Zeeman sextets, which were characterised by different hyperfine magnetic fields and quadrupole splittings. A consistent way of fitting the spectra in the wide range of temperatures was proposed. The composition and temperature dependencies of hyperfine interaction parameters and subspectra contributions were derived from fits and the transition temperatures were determined for all the compounds studied. DSC studies proved that the spin reorientations were accompanied by thermal effects for all compositions of the Gd- and for x = 0.5 of the Th-series. Transformation enthalpy and TSR were determined from these studies and the two-stage character of transition was confirmed. Magnetic spin arrangement diagrams for R = Th and Gd series were constructed and compared using combined data obtained with both methods.
Źródło:
Nukleonika; 2007, 52, supl. 1; 77-79
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrogen ordering effects in Laves - phase YFe2
Autorzy:
Ostrasz, A.
Powiązania:
https://bibliotekanauki.pl/articles/147886.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hydrides
Laves phase
Mössbauer spectroscopy
Opis:
Mössbauer spectroscopy and X-ray diffraction measurements were performed before and after hydrogenation of YFe2 Laves phase in order to investigate the effect of hydrogen on their structural and magnetic properties. The experimental results show an instant change of both the lattice parameters and the hyperfine field. The results are interpreted due to the phase decomposition of the parent intermetallic in the aftermath of creation of stoichiometric hydrides YHc (c = 0.9; 2.5).
Źródło:
Nukleonika; 2013, 58, 1; 77-81
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer study of treated Nd2Fe14B
Autorzy:
Budzyński, M.
Constantin, V. C.
Popescu, A.-N. J.
Surowiec, Z.
Tkachenka, T. M.
Yanushkevich, K. I.
Powiązania:
https://bibliotekanauki.pl/articles/146270.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
intermetallics
intergranular corrosion
Mössbauer spectroscopy
Opis:
The Nd2Fe14B cylindrical magnets were treated with water solutions of alkali, acid, and salt. Mössbauer spectroscopy was applied to study the composition and properties of the surface material of the treated magnets. It is shown that the main phase of the permanent Nd2Fe14B magnet partly decomposes. The released α-Nd at the grain boundaries interacts with water and forms neodymium hydroxide matrix, and the released Fe diffuses into it. The presence of Fe-Nd(OH)3 is refl ected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.
Źródło:
Nukleonika; 2015, 60, 1; 7-10
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of magnetite Fe3O4 nanoparticles for magnetic hyperthermia
Autorzy:
Surowiec, Z.
Miaskowski, A.
Budzyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/147118.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer effect
superparamagnetic nanoparticles
hyperthermia
Opis:
The paper presents the investigation of magnetic nanoparticles (MNPs) dedicated to hyperthermia application. The crystal structure and size distributions have been determined by means of transmission electron microscope (TEM) and X-ray diffraction (XRD). Magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy together with calorimetric experiments. The Mössbauer spectroscopic study of MNPs revealed the existence of a superparamagnetic phase. The relative contribution of the relaxing component to the total spectrum at room temperature was about 10%. The heating effect of these MNPs under alternating magnetic field was examined. The temperature increase has reached 5°C in 10 min. The preliminary temperature rise suggests that the investigated materials are applicable for hyperthermia.
Źródło:
Nukleonika; 2017, 62, 2; 183-186
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic nanowires (Fe, Fe-Co, Fe-Ni) : magnetic moment reorientation in respect of wires composition
Autorzy:
Kalska-Szostko, B.
Wykowska, U.
Satuła, D.
Powiązania:
https://bibliotekanauki.pl/articles/148495.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electrochemistry
electrodeposition
Mössbauer spectroscopy
nanowires
Opis:
Magnetic nanowires of Fe, Fe-Co, and Fe-Ni alloy and layered structure were prepared by electrochemical alternating current (AC) deposition method. The morphology of the nanowires in and without the matrix was studied by energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD), respectively. The wires either show strong dependence on the combination of elements deposition (alloy or layered) or chemical composition (Co or Ni). The magnetic properties of the nanostructures were determined on the basis of Mössbauer spectroscopy (MS).
Źródło:
Nukleonika; 2015, 60, 1; 63-67
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymmetry in Mössbauer spectra of FeIII-azaporphyrin complexes
Autorzy:
Kaczmarzyk, T.
Jackowski, T.
Dziliński, K.
Sinyakov, G.
Powiązania:
https://bibliotekanauki.pl/articles/148331.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer spectroscopy
iron porphyrins
azaporphyrins
asymmetry in Mössbauer spectra
spin-spin and spin-lattice relaxation
Opis:
Temperature dependence of asymmetry as well as isomer shift and quadrupole splitting values of Mössbauer spectra of trivalent iron complexes coordinated to porphyrin ligands such as octaethylporphyrin, monoazaethioporphyrin, diazaoctaethylporphyrin and phthalacyanine is discussed in this paper. All the above mentioned complexes have the chloride axial ligand at the fifth coordination site. Different temperature changes of asymmetry and other parameters of Mössbauer spectra of these complexes can be correlated with a number of methine bridges CH substituted by nitrogen atoms in the porphyrin macrocycle. The form of this asymmetry is such that the higher-energy component of the doublet is more broadened than the lower-energy one, while the areas (intensities) under each of two components are the same. The most distinct asymmetry is observed at room temperature. When temperature is decreasing, the spectrum becomes successively more symmetrical and at liquid helium temperature linewidths of both components of the quadrupole splitting are very close one another. The Mössbauer spectrum of the FeCl-monoazaethioporphyrin complex exhibits reversed asymmetry at liquid helium temperature in comparison with the spectra of the remaining complexes i.e. the lower-energy component of the doublet is slightly more broadened than the higher-energy one. The spin-spin and spinlattice relaxation mechanisms in the context of quantum mechanically mixed spin states S = 5/2 + 3/2 of FeIII ions are considered as a source of the observed asymmetry.
Źródło:
Nukleonika; 2007, 52, supl. 1; 93-98
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase composition of metallurgical slag studied by Mössbauer spectroscopy
Autorzy:
Jonczy, I.
Stanek, J.
Powiązania:
https://bibliotekanauki.pl/articles/147822.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
metallurgical slag
Mössbauer spectroscopy
phase composition
Opis:
The iron bearing phase composition of metallurgical slag currently produced in a tub, converter and electrical furnaces were determined from the Mössbauer spectra and compared with the composition of the slag stored for decades on the dump.
Źródło:
Nukleonika; 2013, 58, 1; 127-131
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of friction products and the surface of tribological system elements
Autorzy:
Brzózka, K.
Żurowski, W.
Górka, B.
Powiązania:
https://bibliotekanauki.pl/articles/147924.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
abrasive wear
Mössbauer spectroscopy
wear resistance
Opis:
The goal of the paper is to identify characteristic features of the surfaces of rubbing bodies and friction products, which come into being when friction processes are realized under optimal conditions, regarding wear resistance. Mössbauer investigations carried out both in scattering and transmission arrangement have evidenced, between others, differences in oxides content and their phase composition, depending on the temperature of tribological system in the course of friction test. It has been found that the wear products obtained at the optimal temperature are composed of the much smaller particles than those produced at lower or at higher temperature.
Źródło:
Nukleonika; 2013, 58, 1; 99-103
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine fields in UFe5Sn compound
Autorzy:
Satuła, D.
Szymański, K.
Tran, V.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/148320.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer studies
uranium intermetallic
magnetic intermetallic
Opis:
Local hyperfine interactions on Fe nuclei in UFe5Sn compound were determined in Mössbauer experiment. The analysis of the Mössbauer spectra measured at room temperature reveals the presence of two doublets only. Absorption line width indicates that neither distribution of quadrupole splitting nor isomer shift exists in the alloy. The measurements at 13 K show the presence of four magnetic components. Because the magnetic dipole and electric quadrupole interactions are present, full Hamiltonian was used to determine the hyperfine interactions for each iron site. Electric field gradient determined at low temperatures agrees with quadrupole splitting observed at room temperature. Absorption areas of the components at low and at high temperatures correspond well to the occupation of
Źródło:
Nukleonika; 2007, 52, supl. 1; 67-69
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
57Fe Mössbauer spectroscopy of annealed metamict davidite
Autorzy:
Malczewski, D.
Frąckowiak, J.
Galuskin, E.
Powiązania:
https://bibliotekanauki.pl/articles/148337.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
davidite
metamict minerals
recrystallization
Mössbauer spectroscopy
Opis:
This paper reports preliminary results of 57Fe Mössbauer spectroscopy and X-ray diffraction (XRD) studies of metamict davidite samples (La,Ce,Ca,Th)(Y,U,Fe)(Ti,Fe,Mn)20(O,OH)38 after high temperature annealing in an argon atmosphere. The Mössbauer spectra show a gradual decrease of quadrupole splitting and line width values of an Fe3+ doublet with increasing annealing temperature. Rather unexpected feature of these spectra for an Fe2+ doublet is a considerable increase of the line width with progressive crystallinity and a simultaneous decrease of both quadrupole splitting and isomer shift values. Changes of the hyperfine parameters as a function of the annealing temperature appeared as sensitive indicators of the thermal recrystallization process of metamict davidite similar to metamict silicates.
Źródło:
Nukleonika; 2007, 52, supl. 1; 81-84
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 183

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