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Wyświetlanie 1-15 z 21
Tytuł:
Structural, magnetic, and Mössbauer effect studies of bornite
Autorzy:
Przewoźnik, J.
Żukrowski, J.
Gondek, Ł.
Lemański, A.
Kapusta, C.
Piestrzyński, A.
Powiązania:
https://bibliotekanauki.pl/articles/147362.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
bornite
hyperfine interactions
magnetic properties
Mössbauer spectroscopy
Opis:
The results of a combined study of bornite with Mossbauer spectroscopy, X-ray diffraction and DC magnetometry are reported. The orthorhombic crystallographic structure of the mineral is observed at 15 K and 300 K. It exhibits an increase of the orthorhombic distortion with decreasing temperature. Magnetic susceptibility shows a Curie-Weiss like behaviour between 230 K and 380 K corresponding to the effective magnetic moment of 7.2(3) mi B per formula unit. The material undergoes a transition to an antiferromagnetic-like state at 75 K. Mossbauer spectra at the paramagnetic range are doublets with a small quadrupole splitting and the isomer shift corresponding to a high spin Fe3+ state. Upon magnetic ordering, a coexistence of the paramagnetic doublet with a broadened magnetic sextet is observed indicating an inhomogeneous character of the magnetic transition. The hyperfine field of 350 kOe at 4.2 K is much lower than that observed for a high spin Fe3+ in oxides (510 kOe) which is attributed to covalence effects and a possible copper contribution to the effective magnetic moment of the compound.
Źródło:
Nukleonika; 2013, 58, 1; 43-46
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and some magnetic properties of (BiFeO3)x-(BaTiO3)1-x solid solutions prepared by solid-state sintering
Autorzy:
Kowal, K.
Kowalczyk, M.
Czekaj, D.
Jartych, E.
Powiązania:
https://bibliotekanauki.pl/articles/146674.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interactions
magnetization
Mössbauer spectroscopy
multiferroics
Opis:
This paper presents the results of the study on structure and magnetic properties of the perovskite-type (BiFeO3)x-(BaTiO3)1-x solid solutions. The samples differing in the chemical composition (x = 0.9, 0.8, and 0.7) were produced according to the conventional solid-state sintering method from the mixture of powders. Moreover, three different variants of the fabrication process differing in the temperatures and soaking time were applied. The results of X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and vibrating sample magnetometry (VSM) were collected and compared for the set of the investigated materials. The structural transformation from rhombohedral to cubic symmetry was observed for the samples with x = 0.7. With increasing of BaTiO3 concentration Mössbauer spectra become broadened refl ecting various confi gurations of atoms around 57Fe probes. Moreover, gradual decreasing of the average hyperfi ne magnetic fi eld and macroscopic magnetization were observed with x decreasing.
Źródło:
Nukleonika; 2015, 60, 1; 81-85
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compositional dependence of hyperfine interactions and magnetoelectric coupling in (BiFeO3)x-(BaTiO3)1–x solid solutions
Autorzy:
Kowal, K.
Guzdek, P.
Kowalczyk, M.
Jartych, E.
Powiązania:
https://bibliotekanauki.pl/articles/147971.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interactions
magnetoelectric coupling
Mössbauer spectroscopy
Opis:
In this work the compositional dependence of hyperfine interactions and magnetoelectric coupling in (BiFeO3)x-(BaTiO3)1–x solid solutions where x = 0.5–0.9 fabricated from commercial BaTiO3 in terms of the solid-state sintering method at various temperatures and over different time periods is described. In general, as the content of BaTiO3 increases, a decrease in the hyperfine magnetic field (Bhf) at 57Fe nuclei was observed. However, for samples exhibiting lower homogeneity in which the ions of Bi3+ and Fe3+ are replaced by Ba2+ and Ti4+ with lower probability, higher values of Bhf are obtained. For the sample where x = 0.6 that exhibits the coexistence of rhombohedral, regular and tetragonal phases, the highest value of the αME coefficient (3.57 mV/A) was observed, which is more than three times higher when compared to the hitherto published results.
Źródło:
Nukleonika; 2017, 62, 2; 117-122
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mean hyperfine fields at 57Fe in dilute iron-based alloys studied by Mössbauer spectroscopy
Autorzy:
Idczak, R.
Konieczny, R.
Chojcan, J.
Powiązania:
https://bibliotekanauki.pl/articles/147537.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interactions
iron alloys
Mössbauer spectroscopy
Opis:
The room temperature Mössbauer spectra of 57Fe were measured for numerous dilute iron-based alloys Fe1-xDx (D = Al, Co, Cr, Mn, Mo, Ni, Os, Pt, Re, Ru, Ta, Ti, V, W, Zn), annealed at 1270 K for 2 h before the measurements. The spectra were analyzed using the Hesse–Rübartsch method in order to determine the mean hyperfi ne magnetic fi eld at the 57Fe nuclei as a function of concentration x of the minority component of the alloy. As the binary alloys are one-faze solid solutions of an element D in iron, a linear relationship between and x is observed. The result supports the suggestion that Mössbauer spectroscopy is a useful tool for the study of dissolution of different elements in iron.
Źródło:
Nukleonika; 2015, 60, 1; 39-42
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local atomic configuration in mechanically synthesized Co-Fe-Ni alloys
Autorzy:
Pikula, T.
Oleszak, D.
Żurawicz, J.
Jartych, E.
Powiązania:
https://bibliotekanauki.pl/articles/148207.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nanocrystalline alloys
mechanical alloying
hyperfine interactions
Mössbauer spectroscopy
Opis:
Ternary Co-Fe-Ni alloys were prepared from the elemental powders by the mechanical alloying method. Structural properties and hyperfine interactions parameters were determined using X-ray diffraction and Mössbauer spectroscopy. X-ray diffraction proved that during milling Co-Fe-based solid solutions with b.c.c. lattice were formed in the case of Co40Fe40Ni20 and Co50Fe40Ni10 alloys, while for Co52Fe26Ni22 and Co65Fe23Ni12 compositions Co-Ni-based solid solutions with f.c.c. lattice were obtained. Mössbauer spectroscopy revealed similar values of the average hyperfine magnetic fields for all the alloys. These values corresponded to the different surroundings of 57Fe isotopes by Co, Fe and Ni atoms, depending on the chemical composition of the alloy. The possible atomic configurations around 57Fe isotopes were discussed on the basis of the local environment model under the assumption that only the first nearest neighbours contribute to the hyperfine magnetic field at 57Fe site.
Źródło:
Nukleonika; 2007, 52, supl. 1; 47-50
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect studies of (BiFeO3)x-(BaTiO3)1-x solid solutions
Autorzy:
Kowal, K.
Jartych, E.
Guzdek, P.
Stoch, P.
Wodecka-Duś, B.
Lisińska-Czekaj, A.
Czekaj, D.
Powiązania:
https://bibliotekanauki.pl/articles/147352.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
multiferroics
hyperfine interactions
Mössbauer spectroscopy
magnetoelectric effect
Opis:
In this work the hyperfine interactions in (BiFeO3)x-(BaTiO3)1-x solid solutions with relation to their structural properties have been investigated. X-ray diffraction, Mössbauer spectroscopy and magnetoelectric effect measurements have been used for studies of sintered (BiFeO3)x-(BaTiO3)1-x solid solutions with x = 0.9, 0.8 and 0.7. With increasing contents of BaTiO3, the structural transformation from rhombohedral to cubic was observed. The weakening of the hyperfine magnetic fields accompanied by this transformation. On the other hand, the increasing amount of BaTiO3 caused an increase of the magnetoelectric effect.
Źródło:
Nukleonika; 2013, 58, 1; 57-61
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of AgFeO2 delafossite with non-stoichiometric silver concentration
Autorzy:
Siedliska, K.
Pikula, T.
Chocyk, D.
Jartych, E.
Powiązania:
https://bibliotekanauki.pl/articles/148622.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
delafossite
silver ferrite
co-precipitation
hyperfine interactions
Mössbauer spectroscopy
Opis:
The simple co-precipitation method was used to prepare AgxFeO2 delafossite with non-stoichiometric silver concentration in the range of x = 0.05–1. The obtained material was investigated using X-ray powder diffraction and 57Fe Mössbauer spectroscopy at room temperature. The structural and hyperfine interaction parameters were recognized in relation with decreasing silver concentration. The study revealed that the delafossite structure of AgxFeO2 was maintained up to x = 0.9; as the range of silver concentration was decreased to 0.05 ≤ x ≤ 0.8, a mixture of AgFeO2, Fe2O3 or/and FeOOH was formed.
Źródło:
Nukleonika; 2017, 62, 2; 165-170
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine interactions and irreversible magnetic behavior in multiferroic Aurivillius compounds
Autorzy:
Jartych, E.
Gąska, K.
Przewoźnik, J.
Kapusta, C.
Lisińska-Czekaj, A.
Czekaj, D.
Surowiec, Z.
Powiązania:
https://bibliotekanauki.pl/articles/147358.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Aurivillius compounds
hyperfine interactions
magnetic properties
Mössbauer spectroscopy
multiferroics
Opis:
In this work investigations of structure and magnetic properties of conventionally sintered Bim+1Ti3Fem.3O3m+3 compounds with 4 less-than or equal to m less-than or equal to 8 were performed using X-ray diffraction, Mossbauer spectroscopy and vibrating sample magnetometry. Room-temperature Mossbauer spectra of the compounds correspond to a paramagnetic state, however, low temperature measurements (80 K) reveal the antiferromagnetic state with a residual paramagnetic phase. Temperature dependencies of magnetic susceptibility,chi sigma(T), provided magnetic ordering temperatures and revealed an irreversibility in Aurivillius compounds with m greater-than or equal to 5. In the case of Bi5Ti3FeO15 compound the chi sigma(T) dependence shows a paramagnetic behavior down to 2 K. The Bi6Ti3Fe2O18 compound reveals a magnetic ordering at 11 K. The compounds with m = 6-8 show a magnetic ordering at temperatures higher than 200 K. Highly irreversible character of their temperature dependencies of chi sigma indicates a spin-glass type disordered magnetism with frustration due to a random distribution of Fe on Ti at their sites.
Źródło:
Nukleonika; 2013, 58, 1; 47-51
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and hyperfine interactions of multiferroic Bim+1Ti3Fem-3O3m+3 ceramics prepared by mechanical activation
Autorzy:
Mazurek, M.
Jartych, E.
Oleszak, D.
Powiązania:
https://bibliotekanauki.pl/articles/147810.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Aurivillius compounds
hyperfine interactions
mechanical activation
Mössbauer spectroscopy
Opis:
The structure and hyperfine interactions in the Bi5Ti3FeO15, Bi6Ti3Fe2O18 and Bi7Ti3Fe3O21 multiferroic ceramics were studied using X-ray diffraction and Mössbauer spectroscopy. Samples were prepared by mechanical activation process in a high-energy ball mill from a mixture of TiO2, Fe2O3 and Bi2O3 oxides as polycrystalline precursor materials. The mechanical milling process was completed by thermal processing. A pure single-phased material was obtained in the case of Bi7Ti3Fe3O21 compound. The proposed mechanical activation technology allows to produce the Aurivillius compounds at lower temperature, by about 50 K, as compared to the solid-state sintering method.
Źródło:
Nukleonika; 2013, 58, 1; 143-147
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer study of magnetite nanowire in MCM-41 type mesoporous silica templates
Autorzy:
Surowiec, Z.
Goworek, J.
Ryczkowski, J.
Budzyński, M.
Wiertel, M.
Sarzyński, J.
Powiązania:
https://bibliotekanauki.pl/articles/148203.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interactions
Mössbauer effect
MCM-41 silica
nanowires
Opis:
Arrays of Fe3O4 nanowires embedded in mesoporous ordered silica were obtained in two ways: dissolving Fe3+ ions in an aqueous medium and their adsorption on internal and external surfaces, with the use of a Fe-EDTA complex. Magnetite polycrystalline nanowires were characterized by means of X-ray diffraction and 57Fe Mössbauer spectroscopy (MS). The average length of these nanowires is about 70 nm and their diameter is about 3 nm. Mössbauer studies evidenced that the composites consist of very small Fe3O4 particles. Almost 80% of particles exist in a paramagnetic state.
Źródło:
Nukleonika; 2007, 52, supl. 1; 33-36
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal structure and Mössbauer effect in multiferroic 0.5BiFeO3-0.5Pb(Fe0.5Ta0.5)O3 solid solution
Autorzy:
Stoch, A.
Maurin, J.
Stoch, P.
Kulawik, J.
Szwagierczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/146870.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
BiFeO3
crystal structure
hyperfine interactions
multiferroics
solid solution
Opis:
Multiferroic 0.5BiFeO3-0.5Pb(Fe0.5Ta0.5)O3 solid solution is a material that exhibits ferroelectric and antiferromagnetic orderings in ambient temperature. The solid solution was obtained as a result of a conventional reaction in a solid state. The obtained material is a dense, fine-grained sinter whose surface was observed by scanning electron microscopy (SEM) and stoichiometry was confirmed by energy dispersive X-ray spectroscopic (EDS) analysis. According to the X-ray powder diffraction (XRD) measurements, the main phase is R3c space group with admixture of Pm-3m regular phase. Small contribution of pyrochlore-like phase was also observed. Mössbauer spectroscopy suggested random distribution of Fe3+/Ta5+ cations in the B sites of ABO3 compound. Reduction of the magnetic hyperfine field with an increase in the substitution of Ta5+ in Fe3+ neighbourhood was also observed.
Źródło:
Nukleonika; 2017, 62, 2; 177-181
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Mössbauer spectroscopy studies of mechanically activated (BiFeO3)1-x-(BaTiO3)x solid solutions
Autorzy:
Malesa, B.
Antolak-Dudka, A.
Oleszak, D.
Pikula, T.
Powiązania:
https://bibliotekanauki.pl/articles/148236.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ceramic solid solutions
hyperfine interactions
mechanical activation
Mössbauer spectroscopy
Opis:
(BiFeO3)1-x-(BaTiO3)x solid solutions with x = 0.1–0.4 and 0.7 were investigated. The ceramics were prepared by mechanical activation technology and subsequent heat treatment. As was proved by X-ray diffraction, increase of BaTiO3 concentration causes a change in the crystalline structure from the rhombohedral structure characteristic of BiFeO3 to a cubic one. 57Fe Mössbauer spectroscopy allowed observation of a gradual transformation from an ordered spin structure of Fe3+ ions to the paramagnetic state with an increase of x.
Źródło:
Nukleonika; 2015, 60, 1; 109-114
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the substitution of Ti for Y on structural properties and hyperfine interactions in Y1-xTixFe2 compounds
Autorzy:
Surowiec, Z.
Sarzyński, J.
Budzyński, M.
Wiertel, M.
Powiązania:
https://bibliotekanauki.pl/articles/971534.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interactions
Mössbauer effect
quasibinary Laves phase
Y1 xTixFe2
Opis:
Abstract Room temperature 57Fe Mössbauer spectroscopy and X-ray diffraction measurements are reported for a series of Y1 xTixFe2 polycrystalline samples. Our research shows that except for x = 0 and x = 1, the samples are a mixture of two C15 and C14 pseudobinary Laves phases. Some Ti atoms occupy the crystallographic positions 8a characteristic of the Y atoms in the cubic C15 structure while the rest of them form the hexagonal C14 phase. However, the lattice constant dependencies on concentration x suggest the occurrence of Y atoms in the positions 4f characteristic of Ti atoms in the hexagonal C14 structure. The partial substitution of Ti atoms for Y atoms is responsible for the HMF changes in the cubic phase. Contrary to the situation taking place in the Zr1 xTixFe2 compounds, magnetic arrangement in the pseudobinary hexagonal phases is not observed at room temperature.
Źródło:
Nukleonika; 2004, 49,suppl.3; 17-21
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Sc substitution for Y on structural properties and hyperfine interactions in Y1-xScxFe2 compounds
Autorzy:
Budzyński, M.
Sarzyński, J.
Wiertel, M.
Surowiec, Z.
Powiązania:
https://bibliotekanauki.pl/articles/148816.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hyperfine interactions
Mössbauer effect
quasibinary Laves phase
Y1-xScxFe2
Opis:
Measurements of X-ray diffraction and Mössbauer effect were made on a series of Y1-xScxFe2 polycrystalline samples (x = 0.0, 0.2, 0.5, 0.7, 0.8, 1.0). It was found that the system has the cubic MgCu2 structure except for x = 1.0 where hexagonal MgZn2 structure type is stable. The lattice constant decreases with increasing x. The results of Mössbauer effect study at room temperature show that the easy axes of magnetization remain in the <111> direction for the cubic samples and <100> for the hexagonal one. Curie temperatures TC were determined from temperature dependence of the hyperfine magnetic fields. The concentration dependence of the hyperfine fields and TC show similar trends, exhibiting a maximum at x = 0.8. The magnetic and structural behaviour show that, in spite of being isoelectronic, the substitution of Y by Sc induces clear changes in the structural and magnetic properties of the compounds under investigation.
Źródło:
Nukleonika; 2003, 48,suppl.1; 79-83
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
Wyświetlanie 1-15 z 21

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