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    Wyświetlanie 1-15 z 15
    Tytuł:
    A comparative study on the performance of radiation detectors from the HgI2 crystals grown by different techniques
    Autorzy:
    Martins, J. F. T.
    Costa, F. E.
    dos Santos, R. A.
    de Mesquita, C. H.
    Hamada, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146916.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal growth
    iodide mercury crystal
    physical vapor transport (PVT)
    radiation detector
    semiconductor crystal
    Opis:
    In this work, the establishment of a technology for HgI2 purification and crystal growth is described, aiming at a future application of this crystal as a room temperature radiation semiconductor detector. Two methods of crystal growth were studied in the development of this work: (1) physical vapor transport (PVT) and (2) saturated solution from dimethylsulphoxide (DMSO) complexes. In order to evaluate the crystals obtained using each of these methods, systematic measurements were carried out for determining the stoichiometry, structure, orientation, surface morphology and impurity of the crystal. The influence of these physicochemical properties of the crystals developed was evaluated in terms of their performance as a radiation detector. The best response to radiation was found for the crystals grown by the PVT technique. Significant improvement in the performance of HgI2 radiation detector was found, purifying the crystal by means of two successive growths by the PVT technique.
    Źródło:
    Nukleonika; 2012, 57, 4; 555-562
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Xe and Kr bonding abilities in the single crystal oxygen vacancies of the uranium based fuel
    Autorzy:
    Dąbrowski, L.
    Szuta, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147880.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    noble gases
    chemical bond
    UO2 single crystal
    valence electron density distribution
    atomic force constants
    bond energy
    crystal lattice
    Opis:
    The valence electron density distribution of krypton and xenon located in the oxygen vacancy and in its nearest neighbourhood was performed by application of the method “ab initio”. The results are presented on the graphs. The bonding energies of krypton and xenon in the uranium dioxide crystal lattice were calculated. It was found also that krypton and xenon cause a local increase of UO1.75Xe0.25 and UO1.75Kr0.25 unit cell and cause its deformation what is presented in tables. The force constants of krypton and xenon were also assigned what gives evidence about the strong bond of krypton and xenon with the UO1.75Xe0.25 and UO1.75Kr0.25 single crystal lattice. Obtained results are compared with the analogical studies of He atom incorporation into UO2 single crystal lattice.
    Źródło:
    Nukleonika; 2012, 57, 1; 95-100
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Position of Fe ions in MgO crystalline structure
    Autorzy:
    Szczerba, J.
    Prorok, R.
    Stoch, P.
    Śnieżek, E.
    Jastrzębska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146372.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    MgO
    Fe ions
    crystal structure
    Opis:
    Magnesium oxide (MgO) is one of the most important raw materials in many branches of industry. Magnesium oxide is a popular refractory raw material because of its high refractoriness and high resistance to basic slags and environment. In many cases, use of MgO is limited by its properties, especially the presence of secondary phases like iron oxides. The amount and distribution of iron oxides can strongly infl uence the technological properties of MgO and depend on the manufacturing method, particularly the heat-treatment process. The aim of the study was to evaluate the infl uence of the heat-treatment process on amount and distribution of iron ions in a magnesium oxide lattice. The 57Fe Mössbauer effect measurements of fused and sintered magnesium oxide samples doped by the iron oxide were conducted. Investigation reveals in both cases the presence of Fe2+ as well as Fe3+ ions. Fe2+ ions occupy Mg2+ octahedral sites in the MgO lattice, whereas the Fe3+ ions are located in highly distorted octahedral coordination. The amount of Fe2+ varies from around 66% for fused samples to 30% for sintered samples.
    Źródło:
    Nukleonika; 2015, 60, 1; 143-145
    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:
    Crystal structures and conformers of CyMe4-BTBP
    Autorzy:
    Lyczko, K.
    Ostrowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147806.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    conformers
    crystal structure
    CyMe4-BTBP
    DFT calculations
    Opis:
    The crystal structure of new conformation of the CyMe4-BTBP ligand (ttc) has been presented. The ttt conformer of this compound in a form of THF solvate has been also crystallized. The geometries of six possible conformations (ttt, ttc, tct, tcc, ctc and ccc) of the CyMe4-BTBP ligand have been modeled in the gas phase and in solutions (MeOH and H2O) by DFT calculations using B3LYP/6-31G(d,p) method. According to the calculations, in the three different media the conformers with trans orientation of the N atoms in the bipyridyl moiety are the most stable.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 2; 853-857
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine interactions in Tb0.27Dy0.73(Fe1–xCox)2 compounds at 77 K
    Autorzy:
    Bodnar, W.
    Szklarska-Łukasik, M.
    Stoch, P.
    Zachariasz, P.
    Pszczoła, J.
    Suwalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148142.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intermetallics
    crystal structure
    Laves phase
    Mössbauer effect
    hyperfine interaction
    Slater-Pauling dependence
    Opis:
    The synthesis of materials, crystal structure and 57Fe Mössbauer effect studies at 77 K were performed for intermetallics Tb0.27Dy0.73(Fe1–xCox)2. The starting compound Tb0.27Dy0.73Fe2 of this Fe/Co substituted series is known as Terfenol-D. XRD measurements evidence a pure cubic Laves phase C15, MgCu2-type. The determined unit cell parameter decreases across the series. Co substitution introduces a local area, in the subnanoscale, with random Fe/Co neighbourhoods of the 57Fe atoms. Mössbauer effect spectra for the Tb0.27Dy0.73(Fe1–xCox)2 series collected at 77 K consist of a number of locally originated subspectra due to random composition of Fe and Co atoms in the nearest neighbourhood. Hyperfine interaction parameters: isomer shift, magnetic hyperfine field and a quadrupole interaction parameter were obtained from the fitting procedure of the spectra, both for the local area and for the sample as bulk. As a result of Fe/Co substitution, a Slater-Pauling type curve for the average magnetic hyperfine field vs. Co content in the Tb0.27Dy0.73(Fe1–xCox)2 series is observed. It is found that the magnetic hyperfine fields corresponding to the local area sorted out against Co contribution in the Fe/Co neighbourhoods also create a dependence similar to the Slater-Pauling type curve.
    Źródło:
    Nukleonika; 2009, 54, 4; 227-232
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer effect studies of Dy(Fe0.4-xNixCo0.6)2
    Autorzy:
    Jabłońska, A.
    Suwalski, J.
    Stoch, P.
    Pszczoła, J.
    Guzdek, P.
    Szamański, P.
    Pańta, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148209.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal structure
    Mössbauer effect
    hyperfine interaction
    Slater-Pauling curve
    band structure
    Opis:
    A consequence of the Fe/Ni substitution in the Dy(Fe0.4Co0.6)2 compound was studied in the present paper. For this purpose the synthesis and X-ray analysis (295 K) of the Dy(Fe0.4 xNixCo0.6)2 series were performed. The cubic, MgCu2-type, Fd3m crystal structure was observed across the series. 57Fe Mössbauer effect spectra for the series were collected at 77 K. The obtained crystallographic data and the hyperfine interaction parameters are presented. The magnetic hyperfine fields form a separate branch of the Slater-Pauling curve known for the Dy(Mn1 xFex)2 and Dy(Fe1 xCox)2 series. The data are qualitatively related to the Stoner model.
    Źródło:
    Nukleonika; 2007, 52, supl. 1; 55-58
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of symmetry of solids in some experiments
    Autorzy:
    Kontrym-Sznajd, Grażyna
    Powiązania:
    https://bibliotekanauki.pl/articles/971520.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Brillouin zone (BZ)
    Compton scattering experiment
    crystal symmetry
    electron momentum densities
    lattice harmonics
    Opis:
    It is known that some anisotropic quantities, that describe the properties of solids, can be determined, to a reasonable accuracy, by a limited number of data along the "special directions" (SD). SDs are very useful in various theoretical and experimental investigations. Among other things, they define projections which are the most efficient to reconstruct three-dimensional (3-D) electron momentum densities from Compton scattering spectra. The concept of SDs and their power is illustrated by comparing an isotropic average of the function based on either three high-symmetry directions or even only one, but SD.
    Źródło:
    Nukleonika; 2013, 58, 1; 207-210
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer investigations of Mn2-xFexP0.5As0.5
    Autorzy:
    Mitsiuk, V. I.
    Tkachenka, T. M.
    Budzyński, M.
    Surowiec, Z.
    Valkov, V. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/147832.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Fe2P-type crystal structure
    local environment
    magnetic interaction
    Mössbauer effect
    Opis:
    Magnetic and Mossbauer measurements were performed for Mn2.xFexP0.5As0.5, 0.5 less-than or equal to x less-than or equal to 1.0. It was shown that with decreasing Fe content magnetic interaction significantly weakens. Low temperature magnetic structure could be explained as a superposition of ferromagnetic and antiferromagnetic contributions to the whole magnetic moment of the alloy.
    Źródło:
    Nukleonika; 2013, 58, 1; 169-172
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine interactions in Ho(Fe1-xCox)2 compounds at 295 K
    Autorzy:
    Bednarski, M.
    Stoch, P.
    Bodnar, W.
    Zachariasz, P.
    Pszczoła, J.
    Suwalski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148624.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intermetallics
    crystal structure
    Laves phase
    Mössbauer effect
    hyperfine interaction
    Slater-Pauling dependence
    Opis:
    Synthesis of Ho(Fe1–xCox)2 intermetallic compounds, studies of their crystal structure and 57Fe Mössbauer effect analysis were carried out at 295 K. X-ray measurements evidence a pure cubic Fd3m, C15, MgCu2-type Laves phase. The unit cell parameter decreases non-linearly with composition parameter x. Mössbauer effect spectra for the Ho(Fe1–xCox)2 series were composed of a number of locally originated subspectra due to random Fe/Co nearest neighbourhoods. Hyperfine interaction parameters, i.e. isomer shift, the magnetic hyperfine field and a quadrupole interaction parameter were determined from the fitting procedure of the spectra, for both the individual nearest neighbourhoods, and for the sample as bulk. As a consequence of Fe/Co substitution a Slater-Pauling type curve for the average magnetic hyperfine field vs. x is observed. The correlation between the local magnetic hyperfine fields and the average magnetic hyperfine fields is related to weak and strong ferromagnetism of the transition metal sublattice.
    Źródło:
    Nukleonika; 2010, 55, 3; 279-284
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Mössbauer effect studies of Dy(Fe0.4Co0.6-x Alx)2 intermetallics
    Autorzy:
    Stoch, P.
    Pszczoła, J.
    Suwalski, J.
    Pańta, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148809.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal structure
    hyperfine interactions
    Mössbauer spectroscopy
    rare earth
    Slater-Pauling curve
    transition
    Opis:
    The magnetic hyperfine fields observed at the 57Fe nuclei (77 K) in the Dy(Mn1-xFex)2 and Dy(Fe1-xCox)2 intermetallics form a Slater-Pauling curve. In order to study the effect of cobalt atoms on crystal structure and hyperfine interactions, the new Co/Al substituted series Dy(Fe0.4Co0.6-xAlx)2 was prepared and data of X-ray powder analysis are presented (300 K). From the 57Fe Mössbauer measurements at 77 K the hyperfine parameters were obtained. The magnetic hyperfine fields form a branch of the Slater-Pauling curve.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 75-77
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer effect studies of Dy(Mn0.4-xAlxFe0.6)2 intermetallics
    Autorzy:
    Stoch, P.
    Pszczoła, J.
    Guzdek, P.
    Jabłońska, A.
    Suwalski, J.
    Dąbrowski, L.
    Pańta, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147206.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intermetallics
    crystal structure
    57Fe Mössbauer effect
    hyperfine interactions
    Slater-Pauling curve
    Opis:
    Both 3d subbands in the Dy(Mn0.4Fe0.6)2 compound are filled up only partially with 3d electrons. So, it was interesting to study the consequence of Mn/Al substitution in the Dy(Mn0.4 xAlxFe0.6)2 series. The cubic, MgCu2-type, Fd3m crystal structure was observed across the series. However, for x = 0.35 and 0.40 a stoichiometric admixture of the hexagonal, MgZn2-type, P63/mmc structure was evidenced. Mössbauer effect measurements at 57Fe nuclei were performed at 77 K. The magnetic hyperfine field decreases vs. the aluminium content x. This dependence is related to the possible 3d-electron band structure.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 23-25
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer effect studies of Dy(Fe0.7-xNixCo0.3)2 intermetallics
    Autorzy:
    Jabłońska, A.
    Suwalski, J.
    Pszczoła, J.
    Guzdek, P.
    Stoch, P.
    Pańta, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147231.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intermetallics
    crystal structure
    57Fe Mössbauer effect
    hyperfine interactions
    Slater-Pauling curve
    band structure
    Opis:
    Abstract A consequence of the Fe/Ni substitution in the series of Dy(Fe0.7 xNixCo0.3)2 was studied in the presented paper. The synthesis and X-ray analysis (300 K) of the Dy(Fe0.7 xNixCo0.3)2 system were performed. The cubic, MgCu2-type, Fd3m crystal structure was evidenced for this solid solution. 57Fe Mössbauer effect measurements for the system were carried out at 77 K. The obtained crystallographic lattice parameters and the hyperfine interaction data are presented. The magnetic hyperfine field values form a separate branch of the Slater-Pauling curve situated above the branch corresponding to the Dy(Fe1 xCox)2 intermetallics.
    Źródło:
    Nukleonika; 2004, 49,suppl.3; 85-88
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal electric field parameters determination for R2Fe14B compounds based on Yamada - Kato model
    Autorzy:
    Bogacz, B. F.
    Pędziwiatr, A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147342.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal electric field parameters
    model Yamada-Kato
    Mössbauer effect
    permanent magnet materials
    spin reorientation
    Opis:
    Semi-empirical model developed by Yamada-Kato enables calculation of magnetic spin directions for R2Fe14B compounds, based on minimization of free energy, and - in further steps - determination of spin reorientation temperatures for transitions from basal plane to axial easy magnetization direction. In our study, this model has been successfully used to determine crystal field and exchange field parameters for Er2-xCexFe14B compounds based on spin reorientation temperatures obtained experimentally from Mössbauer measurements.
    Źródło:
    Nukleonika; 2013, 58, 1; 31-33
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians
    Autorzy:
    Rudowicz, Cz.
    Karbowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971531.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal/ligand field (CF/LF) Hamiltonian electron magnetic resonance (EMR)
    magnetism
    optical spectroscopy
    transition (3dN and 4fN) ions
    zero-field splitting (ZFS)
    Opis:
    The interface between optical spectroscopy, electron magnetic resonance (EMR), and magnetism of transition ions forms the intricate web of interrelated notions. Major notions are the physical Hamiltonians, which include the crystal field (CF) (or equivalently ligand field (LF)) Hamiltonians, and the effective spin Hamiltonians (SH), which include the zero-fi eld splitting (ZFS) Hamiltonians as well as to a certain extent also the notion of magnetic anisotropy (MA). Survey of recent literature has revealed that this interface, denoted CF (LF) ↔ SH (ZFS), has become dangerously entangled over the years. The same notion is referred to by three names that are not synonymous: CF (LF), SH (ZFS), and MA. In view of the strong need for systematization of nomenclature aimed at bringing order to the multitude of different Hamiltonians and the associated quantities, we have embarked on this systematization. In this article, we do an overview of our efforts aimed at providing a deeper understanding of the major intricacies occurring at the CF (LF) ↔ SH (ZFS) interface with the focus on the EMR-related problems for transition ions.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 377-383
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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