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    Wyświetlanie 1-4 z 4
    Tytuł:
    Zone-Plate Based Nanospectroscopy with Soft X-Rays at the SLS
    Autorzy:
    Fink, R.
    Hub, C.
    Tzvetkov, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808308.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Yz
    82.80.-d
    82.80.Ej
    07.85.Tt
    Opis:
    With the advance of nanostructuring techniques and the availability of third-generation synchrotron sources, Fresnel-type zone plate optics is widely used for nanospectroscopic investigations with resolutions of several 10 nm. Whereas hard X-rays commonly use diffraction or elemental contrast (e.g. using X-ray fluorescence), soft X-rays are favored to utilize the spectroscopic contrast in the near-edge region of the absorption edge. In particular, for soft materials, the relevant C-, N- and O 1s absorption edges show distinct resonances which allow fingerprint-type chemical identification, even in water surroundings. Few selected examples from modern material science will be discussed to demonstrate that the combination of X-ray absorption spectroscopy with high spatial resolution yields new insight into the nanoscale properties of these materials.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 462-466
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mössbauer Study of Magnetic Properties of $Fe_{80-x}Co_{x}Zr_7Si_{13}$ (x = 0-30~at.%) Boron-Free Amorphous Alloys
    Autorzy:
    Kopcewicz, M.
    Grabias, A.
    Latuch, J.
    Ferenc, J.
    Żuberek, R.
    Nesteruk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428677.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.-d
    76.80.+y
    82.80.Ej
    Opis:
    Amorphous $Fe_{80-x}Co_{x}Zr_7Si_{13}$ (x = 0-30 at.%) alloys in which boron was completely replaced by silicon as a glass forming element have been prepared by melt quenching. Partial substitution of iron by cobalt caused the increase of the hyperfine field and saturation magnetization. The specialized rf-Mössbauer measurements revealed that all amorphous alloys studied are magnetically very soft. The rf-sidebands effect, related to magnetostriction, increases with the increase of Co content. In $Fe_{50}Co_{30}Zr_7Si_{13}$ sample the rf field exposure induced partial crystallization of amorphous phase that was attributed to mechanical deformations related to high frequency magnetostrictive vibrations induced by the rf field. The measurements of the hysteresis loop revealed that coercivity increases for higher Co content.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1257-1260
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Mechanochemical Treatment on Magnetic Properties of Nanodimensional Magnetite-Type Materials
    Autorzy:
    Cherkezova-Zheleva, Z.
    Zaharieva, K.
    Buchkov, K.
    Blagoev, B.
    Mitov, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382568.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.-d
    75.75.-c
    82.80.Ej
    Opis:
    The presented study compares magnetic properties of Ni-doped magnetites $Ni_{0.5}^{2+}Fe_{0.5}^{2+}Fe_{2}^{3+}O_{4}$ to magnetite $(Fe_3O_4)$ sample. Physicochemical properties of materials were registered by means of X-ray powder diffraction, Mössbauer spectroscopy, saturation magnetization and physical properties measurement systems. It was obtained that used preparation procedures lead to synthesis of single phase spinel materials with close nanodimensional size about 8-12 nm. Mechanochemically synthesized sample shows better magnetic properties as lower blocking temperature of superparamagnetic state and minimal coercivity in comparison to other studied materials.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 912-915
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bivalve Characterization Using Synchrotron Micro X-Ray Fluorescence
    Autorzy:
    Jones, K.
    Bronson, S.
    Brink, P.
    Gordon, C.
    Mosher-Smith, K.
    Brown, M.
    Chaudhry, S.
    Rizzo, A.
    Sigismondi, R.
    Whitehurst, M.
    Lukaszewski, A.
    Kranz, D.
    Bland, K.
    Gordan, D.
    Lobel, J.
    Sullivan, J.
    Metzger, M.
    O'Shea, C.
    Harris, C.
    Arezzo, R.
    Kambhampati, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808352.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.40.-d
    07.85.Qe
    82.80.Ej
    87.59.-e
    Opis:
    Bivalves, oysters, mussels, and clams are important constituents of riverine and estuarine ecosystems. Their shells and soft tissues provide information on the environments in which they live. Since they are filter feeders, they also are factors in improving water quality through removal of particulate matter from the water column. Finally, they are a valuable food source that has substantial economic value. Hence, characterization of shells and soft tissues is useful for improved understanding of these factors. Here, we used X-ray microprobes and computed microtomography facilities at the Brookhaven National Synchrotron Light Source to investigate elemental distributions in bivalves taken from locations around New York, Washington, DC, and New Orleans, LA. The results form the initial basis for compilation of a database of relevant parameters that can serve for tracking environmental changes and for assessing toxicity of particular metals. The work was enabled by active collaboration with students from the several regions, community groups, and research scientists. The collaboration was facilitated through use of web conferencing between Brookhaven National Laboratory and the varied locations.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 477-481
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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