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    Wyświetlanie 1-5 z 5
    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:
    Analysis of heat capacity and Mössbauer data for LuZnSn2 compound
    Autorzy:
    Łątka, K.
    Przewoźnik, J.
    Żukrowski, J.
    Verbovytskyy, Y.
    Gonçalves, A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147720.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    heat capacity
    Mössbauer studies
    rare earth ternary compounds
    Opis:
    New analysis of heat capacity data is presented for LuZnSn2 compound that takes into account anharmonic effects together with the existence of Einstein modes. 119mSn Mössbauer spectroscopy was used to monitor the hyperfi ne parameters at the two crystallographically inequivalent Sn sites in the studied compound. The problem of non-unique mathematical resonance spectrum description and the problem how to choose physically meaningful set of hyperfi ne parameters will be thoroughly discussed. Measured quadrupole interaction constants by 119mSn Mössbauer spectroscopy give estimations for Vzz component of electric fi eld gradient tensor at both Sn sites in LuZnSn2.
    Źródło:
    Nukleonika; 2015, 60, 1; 97-101
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    155Gd isomer shifts : the case study : GdT2Si2
    Autorzy:
    Łątka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147398.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    isomer shifts
    Mössbauer studies
    rare earth ternary compounds
    Opis:
    The experimentally obtained 155Gd Mössbauer effect results in isomer shifts for GdT2Si2 compounds (where T are transition metals for the 3d, 4d and 5d series) are analysed in terms of charge-transfer effects and s, d redistribution by means of the extended Miedema and van der Woude model. The comparison between the theoretically predicted and measured values is discussed. Although these theoretical predictions of isomer shifts are in reasonable agreement with those found in the experiment, nevertheless they do not follow the experimental dependence on T metal acquired for each nd-series.
    Źródło:
    Nukleonika; 2013, 58, 1; 23-26
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    119Sn hyperfine interactions in REAuSn (RE = rare earth)
    Autorzy:
    Łątka, K.
    Gurgul, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148307.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    antiferromagnetism
    Mössbauer studies
    rare earth ternary compounds
    magnetically ordered materials
    Opis:
    Intermetallic REAuSn (RE = rare earth elements) compounds were studied by means of X-ray diffraction (XRD), magnetic measurements and 119Sn Mössbauer spectroscopy. It was shown that the majority of them exhibit complex antiferromagnetic ordering at low temperatures. The nature of hyperfine interactions has been discussed based on gamma-ray absorption spectroscopy together with magnetic and structural data. Lanthanide contraction is reflected in the lattice parameters and isomer shifts. Strong experimental arguments support correlation between crystallographic type of structure and magnetic disordering in investigated compounds.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 63-66
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of low temperature diffusion of carbon in martensite by Mössbauer spectroscopy and X-ray diffraction
    Autorzy:
    Jabłońska, A.
    Dąbrowski, L.
    Suwalski, J.
    Neov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147492.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    martensite
    diffusion coefficients
    Mössbauer specroscopy
    X-ray studies
    Opis:
    Martensite containing 0.87 wt.% carbon was studied by Mössbauer spectroscopy at temperatures, T = 10, 15, 25, 40 and 78 K and by X-ray diffraction at T = 78 K in the course of 35 days. Samples in the form of 30 mm thick foil of pure carbon martensite with enhanced tetragonality were synthesized applying non-standard technology. The measured by X-rays (c/a - 1) ratio varies within the limits 0.044-0.055 by pulsations with a period of few hours. According to Kurdimov’s model any changes in tetragonality of martensite are fully related to the passage of carbon atoms from Oc to Oa and Ob octahedral sites or vice versa. Pulsations of the central and satellite sextets were observed by Mössbauer spectroscopy. In accordance with the conventional interpretation of satellites, these pulsations result from different spatial distribution of carbon around the Fe atoms in the diffusion process. The data of (c/a - 1) pulsations were used to determine the diffusion coefficient below 78 K. The measured diffusion coefficient of carbon in a-iron below 78 K contradicts the classical approach to the observed temperature dependence. As the temperature is lowered below 78 K, the diffusion constant approaches the nearly temperature-independent value. The low temperature branch is apparently characteristic of a quantum mechanical process dominated by tunnelling in the ground state.
    Źródło:
    Nukleonika; 2006, 51, 2; 101-104
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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