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    Wyświetlanie 1-8 z 8
    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:
    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:
    Wybrane właściwości strukturalne i magnetyczne elektroceramniki (BiFeO3)x-(BaTiO3)1-x
    The selected structural and magnetic properties of (BiFe03)x-(BaTi03)1-x electroceramics
    Autorzy:
    Kowal, K.
    Lisińska-Czekaj, A.
    Czekaj, D.
    Jartych, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/407904.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    materiały multiferroiczne
    elektroceramika
    (BiFe03)x-(BaTi03)1-x
    żelazian bizmutu
    tytanian baru
    spektroskopia Mössbauera
    oddziaływania nadsubtelne
    multiferroic materials
    electroceramics
    bismuth ferrite
    barium titanate
    Mössbauer spectroscopy
    byperfine interactions
    Opis:
    Przedmiotem niniejszej pracy były badania oddziaływań nadsubtelnych w roztworach stałych żelazianu bizmutu - tytanianu baru o wzorze ogólnym (BiFe03)x-(BaTi0 3)1-x dla różnych koncentracji BiFe03 (x = 0,7; 0,8 i 0,9). Materiał badań otrzymano metodą swobodnego spiekania w temperaturach T = 1073-1103K. Przeprowadzone pomiary mossbauerowskie i dyfraktometryczne wykazują związek pomiędzy zawartością BiFe0 3 a właściwościami strukturalnymi i magnetycznymi elektroceramiki. Zależność parametrów oddziaływań nadsubtelnych od x nie jest bezpośrednio związana z przejściami fazowymi w badanych materiałach.
    The aim of this article is to present the hyperflne interactions in the solid solutions of bismuth ferrite - barium titanate, described by the general formula (BiFe0 3)x-(BaTi0 3)1-x for different content of BiFe0 3 (x = 0,7; 0,8 and 0,9). The ceramics were synthesized at temperatures in the range of T = 1073-1103K by sintering method. The measurements of both Mossbauer spectroscopy and x-ray diffraction indicate the relationship between the content of BiFe03 and the properties of the electroceramics. However, the compositional dependence of the hyperflne interactions parameters does not harmonize with the phase transitions in this material.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2012, 2; 25-30
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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