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Wyświetlanie 1-15 z 130
Tytuł:
57Fe Mössbauer effect studies of ErFe11Ti and ErFe11TiH compounds
Autorzy:
Gaczyński, P.
Tereshina, I.
Rusakov, V.
Nikitin, S.
Drulis, H.
Powiązania:
https://bibliotekanauki.pl/articles/148892.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
rare earth
iron compounds
metal hydrides
Mössbauer spectroscopy
Opis:
Ferromagnetic compounds ErFe11TiHx (x = 0, 1) have been investigated by 57Fe Mössbauer spectroscopy in the temperature range 20–300 K. Mössbauer spectra were analyzed in terms of a model which takes into account the local environment of Fe atoms on three crystallographic sites (8f, 8j and 8i) and an influence of the random distribution of titanium on the 8i site. The 14 sextets with different intensities have been considered. The temperature dependencies of hyperfine interaction parameters and subspectra contributions were derived from experimental spectra. The hyperfine fields and the isomer shift increasing upon hydrogenation are discussed in terms of the hydrogen-induced Wigner-Seitz unit cell expansion and the s-electrons transfer from Fe atoms to the adjacent hydrogen atoms.
Źródło:
Nukleonika; 2003, 48,suppl.1; 25-29
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
57Fe Mössbauer spectroscopy and X-ray diffraction study of gadolinites REE2Fe2+Be2Si2O10 from Lower Silesia (Poland) and Ytterby (Sweden)
Autorzy:
Malczewski, D.
Powiązania:
https://bibliotekanauki.pl/articles/148858.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
gadolinite
Mössbauer spectroscopy
X-ray diffraction
Opis:
This paper reports the results of 57Fe Mössbauer spectroscopy, X-ray diffraction (XRD) and gamma-ray spectroscopy studies of partially metamict gadolinites from Szklarska Poręba and Zimnik (Lower Silesia, Poland), a fully metamict gadolinite sample from Ytterby (Sweden) and a crystalline sample obtained after annealing of a fragment of the sample from Ytterby at 1373 K in an argon atmosphere. Both fully metamict and crystalline gadolinite show divalent iron exclusively in octahedral coordination. Changes of the amplitudes ratio of high energy to low energy absorption peaks from Fe2+ quadrupole doublets are strictly correlated with calculated absorbed alpha-dose and the metamictization stages of the gadolinite specimens. In this respect, one of the samples is in conflict with the estimated radiation dose based on age and radionuclide concentrations. In this case, Mössbauer spectroscopy shows that the sample had to be naturally annealed over geologic time.
Źródło:
Nukleonika; 2003, 48,suppl.1; 41-44
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
57Fe Mössbauer spectroscopy investigations of iron phase composition in fluidized beds from the ELCHO power plant in Chorzów, Poland
Autorzy:
Kądziołka-Gaweł, M.
Smolka-Danielowska, D.
Powiązania:
https://bibliotekanauki.pl/articles/148850.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer spectroscopy
fly ash
bottom ash
Opis:
The study investigates the physical and chemical properties of fly ash and bottom ash from a power plant ELCHO in Chorzów, Poland. Coal combustion products generated in the process of combustion in circulating fluidized beds (CFBs) are considerably different from fly and bottom ashes obtained from dust furnaces and multi-layer ones. The composition of the iron-bearing phase in the waste of circulating fluidized bed combustion was determined using Mössbauer spectroscopy and X-ray powder diffraction (XRD) methods.
Źródło:
Nukleonika; 2017, 62, 2; 101-107
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
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:
A Mössbauer and structural study of disordered alloys Fe3-xTixAl (0 < x < 1)
Autorzy:
Brząkalik, K.
Frąckowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/148880.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Fe2TiAl Heusler phase
Fe-Ti-Al system
Mössbauer spectroscopy
Opis:
A series of the disordered Fe3-xTixAl (x = 0, 0.2, 0.45, 0.55, 0.65, 0.70, 0.75, 1) alloys obtained by arc-melting were studied. Directly after melting the samples were mechanically crashed and in that form examined by the structural and Mössbauer effect methods. The alloys were strongly disordered, but it was possible to identify, apart from Fe-bcc phase, the origins of forming such phases as Fe2TiAl Heusler phase, Fe3Al with DO3 structure, FeAl and FeTi with B2 structure and non-stechiometric Fe2Ti Laves phase with hexagonal C14 structure. For Ti concentration up to x = 0.45, the disordered Fe-bcc phase dominates. For Ti concentration from x = 0.55 to x = 1, the Fe2TiAl phase coexists with FeAl phase (for x = 0.55, 0.65) and with FeTi phase (x = 0.7 and 0.75). In a sample with the nominal Fe2TiAl composition of Fe2TiAl Heusler phase, a non-stoichiometric Fe2Ti Laves phase with hexagonal C14 structure was observed.
Źródło:
Nukleonika; 2003, 48,suppl.1; 13-16
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A multi-analytical approach for the analysis of cation distribution in a aluminoceladonite structure
Autorzy:
Kądziołka-Gaweł, Mariola
Dulski, Mateusz
Czaja, Maria
Krzykawski, Tomasz
Szubka, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2172615.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminoceladonite
ions position characterization isomorphic substitutions
Fe bearing phyllosilicates
X-ray photoelectron spectroscopy
Mössbauer spectroscopy
Raman spectroscopy
glinokrzemiany
krzemiany warstwowe
rentgenowska spektrometria fotoelektronów
XPS
spektroskopia mössabuerowska
spektroskopia Ramana
Opis:
In this paper cation arrangement in two samples of aluminoceladonite, emerald green and dark-green were studied by Mössbauer, Raman and X-ray photoelectron spectroscopies. The X-ray photoelectron spectroscopy (XPS) spectra obtained in the region of the Si2p, Al2p, Fe2p, K2p, and O1s core levels provided information, for the first time highlighting a route to identify the position of Si, Al, K, and Fe cations in a structure of layered silicates. The XPS analysis showed the presence of Al in tetrahedral and octahedral coordination while the K2p line indicated the possibility of K+ substitution by other cations in interlayer sites. Mössbauer spectroscopy provided information about crystal chemistry with respect to the local electronic and geometric environment around the Fe atom and to distortions of the polyhedra. It turned out that iron was located mostly in the cis-octahedra position wherein about 75% of iron appeared in the form of Fe3+. The most preferred cation combinations around Fe corresponded to 3Fe3+ ions and MgFe2+Fe3+/2MgFe3+. Raman spectroscopy illustrated aluminium substitution in silicon and iron positions wherein the concentration of the aluminium determined the degree of structural distortion within the layered system. These isomorphic substitutions implied a typical band arrangement in the hydroxyl region, which has not been observed in celadonites so far.
Źródło:
Acta Geologica Polonica; 2022, 72, 3; 353--368
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of thermodynamic properties of dilute Fe-Au alloys by the ⁵⁷Fe Mössbauer spectroscopy
Autorzy:
Konieczny, R.
Idczak, R.
Chojcan, J.
Powiązania:
https://bibliotekanauki.pl/articles/1054974.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Mössbauer spectroscopy
hyperfine parameters
binding energy
short-range order
enthalpy of solution
enthalpy of mixing
binary alloys
Opis:
The room temperature Mössbauer spectra of ⁵⁷Fe were measured for Fe_{1-x}Au_x with the gold concentration ranging from 1 at.% till 4.8 at.%. They were analysed in terms of hyperfine parameters of their components related to unlike surroundings of the iron probes, determined by different numbers of gold atoms existing in the neighbourhood of iron atoms. Basing on the intensities of the spectrum components we determined binding energy E_b between two gold atoms in the studied materials. The latter was done for properly annealed samples using the extended Hrynkiewicz-Królas idea. It was found that the binding energy is positive or Au atoms interact repulsively. The extrapolated value of E_b for x =0 was used for computation of an enthalpy of solution of Au in Fe. Finally the obtained value of the enthalpy was used to predict the mixing enthalpy for the Fe-Au solid solutions. The results were compared with both the corresponding values resulting from the cellular atomic model of alloys by Miedema and those derived from experimental calorimetric data given in the literature.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 255-258
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An example of the application of Mössbauer spectroscopy for determination of concentration of iron in lyophilized brain tissue
Autorzy:
Rzepecka, P.
Duda, P.
Giebułtowicz, J.
Sochacka, M.
Friedman, A.
Gałązka-Friedman, J.
Powiązania:
https://bibliotekanauki.pl/articles/147214.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer spectroscopy
background spectrum
iron concentration
brain tissue
calibration curve
Opis:
Mössbauer spectroscopy is not routinely used for the determination of the concentration of iron. However, as this method does not need any pre-treatment of samples before measurements, it may be of extreme importance for the assessment of iron in samples, which can then be used for further investigations. Biological samples are a good example, however, as the concentrations of iron are very low in these, it is important to exclude possible artefacts from the background spectrum related to iron present in the counter and cryostat windows. The aim of this study was to compare two methods of determination of the amounts of iron in investigated sample: one, in which the background spectrum was subtracted from the sample spectrum measured, and the other, in which the obtained non-elaborated spectrum was fitted with two doublets – a doublet for the measured sample and a doublet for the background spectrum. Three samples containing known amounts of natural iron (400, 800 and 1600 µg) and a sample of lyophilized human brain tissue obtained from globus pallidus were assessed. Both methods led to the creation of a very good calibration curve with a correlation coefficient of 0.99. Although both methods gave similar results for the concentration of iron in the sample, the subtraction of the background spectrum had a significantly lower error of the final result.
Źródło:
Nukleonika; 2017, 62, 2; 159-163
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of nuclear techniques for characterization of materials surfaces : own investigations examples
Autorzy:
Sartowska, B.
Piekoszewski, J.
Waliś, L.
Starosta, W.
Barlak, M.
Nowicki, L.
Ratajczak, R.
Powiązania:
https://bibliotekanauki.pl/articles/146726.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
conversion electron Mössbauer spectroscopy (CEMS)
nuclear reaction analysis (NRA)
nuclear techniques
surface characterization
surface modification
Opis:
Different methods and techniques for material characterization are often used as a standard procedure for the determination of material properties. Nuclear techniques provide new and more detailed information about the investigated materials. The main goal of the carried out experiments was to improve surface properties including wear, corrosion and high temperature oxidation resistance. Modification processes were carried out using high intensity pulsed plasma beams - HIPPB (106-108 W.cm-2) generated in a rod plasma injector (RPI). In most solid materials such treatment leads to a fast transient melting of the surface layer of the substrate followed by rapid crystallization. Heating and cooling processes are of non-equilibrium type. Initial and modified materials were characterized using different investigation methods including nuclear techniques. Results of the used nuclear techniques such as nuclear reaction analysis (NRA), Rutherford backscattered spectroscopy (RBS) and conversion electron Mössbauer spectroscopy (CEMS) are presented in the paper.
Źródło:
Nukleonika; 2012, 57, 4; 521-528
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:
Atomic short-range order in mechanically synthesized iron based Fe-Zn alloys studied by 57Fe Mössbauer spectroscopy
Autorzy:
Konieczny, R.
Idczak, R.
Powiązania:
https://bibliotekanauki.pl/articles/148820.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interactions
mechanical alloying
Mössbauer spectroscopy
nanocrystalline materials
short-range order
Opis:
Mechanical alloying method was applied to prepare nanocrystalline iron-based Fe1-xZnx solid solutions with x in the range 0.01 ≤ x ≤ 0.05. The structural properties of the materials were investigated with the Mössbauer spectroscopy by measuring the room temperature spectra of 57Fe for as-obtained and annealed samples. The spectra were analyzed in terms of parameters of their components related to unlike surroundings of the iron probes, determined by different numbers of zinc atoms existing in the neighborhood of iron atoms. The obtained results gave clear evidence that after annealing process, the distribution of impurity atoms in the fi rst coordination spheres of 57Fe nuclei is not random and it cannot be described by binomial distribution. The estimated, positive values of the short-range order parameters suggest clustering tendencies of Zn atoms in the Fe-Zn alloys with low zinc concentration. The results were compared with corresponding data derived from Calphad calculation and resulting from the cellular atomic model of alloys by Miedema.
Źródło:
Nukleonika; 2015, 60, 1; 69-73
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania mössbauerowskie 3 chondrytów zwyczajnych typu L (Beni M’hira, Hyattville, Saratov) – wyznaczanie niepewności powierzchni spektralnych
Mössbauer studies of three ordinary chondrites type L (Beni M’hira, Hyattville, Saratov) – uncertainty of the determination of spectral areas
Autorzy:
Jakubowska, Martyna
Czarnecki, Arkadiusz
Robak, Marta
Zagrobelna, Anita
Bogusz, Patrycja
Woźniak, Marek
Gałązka-Friedman, Jolanta
Karwowski, Łukasz
Duda, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/1032382.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Beni M’hira
Hyattville
Mössbauer spectroscopy
Saratov
percentage of the spectral areas
Opis:
Mössbauer 57Fe measurements of three ordinary chondrites type L were performed at room temperature. The measurements were repeated in the same experimental conditions. The experimental spectra were elaborated with „Recoil” program. The absorption areas of the same ordinary chondrite samples were very similar. The maximum variation was about 2% for doublets (paramagnetic iron) and 3% for sextet (magnetically ordered iron).
Źródło:
Acta Societatis Metheoriticae Polonorum; 2019, 10; 29-33
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania mössbauerowskie chondrytów zwyczajnych typu H potwierdzają stopień ich zwietrzenia określony za pomocą skali W
Mössbauer measurements of ordinary chondrites type H confirm their level of weathering determined by scale W
Autorzy:
Jakubowska, Martyna
Rzepecka, Patrycja
Duda, Przemysław
Woźniak, Marek
Gałązka-Friedman, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/1033083.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Carancas
Gao-Guenie meteorites
Juancheng
Mössbauer spectroscopy
weathering
Opis:
Mössbauer measurements of ordinary chondrites type H performed in room temperature are presented. Three investigated meteorites: Carancas, Juancheng and Gao-Guenie are new falls with different terrestrial history. Results of weathering in different conditions during terrestrial life are well seen in their Mössbauer spectra. The level of weathering determined by scale W is in perfect agreement with Mössbauer measurements of these three ordinary chondrites.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2017, 8; 63-72
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania mossbauerowskie meteorytu Zakłodzie
Autorzy:
Maliszewski, Adam
Gałązka-Friedman, Jolanta
Bakun-Czubarow, Nonna
Powiązania:
https://bibliotekanauki.pl/articles/1032683.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Zakłodzie meteorite
enstatite meteorites
mössbauer spectroscopy
Opis:
The Zakłodzie meteorite is primitive enstatite achondrite. Mössbauer spectra of powdered samples of the Zakłodzie meteorite were obtained. Results from Mössbauer spectroscopy were compared with results electron microprobe measurements.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2009, 1; 110-121
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 130

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