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    Wyświetlanie 1-5 z 5
    Tytuł:
    Microstructure and magnetic properties of amorphous Fe51Co12Si16B8Mo5P8 alloy
    Autorzy:
    Hasiak, M.
    Miglierini, M.
    Amini, N.
    Bujdoš, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147218.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    microstructure
    Mössbauer spectroscopy
    magnetic properties
    Curie point
    Opis:
    Microstructure and thermomagnetic characteristics of the amorphous Fe51Co12Si16B8Mo5P8 alloy in the as-quenched state and after 1 h of annealing at 573 K and 773 K are studied. The structural investigations performed by Mössbauer spectroscopy and X-ray diffractometry confirmed the amorphous structure of the analysed materials. An increase in the annealing temperature up to 773 K does not lead to crystallization of the amorphous alloy. Only structural rearrangement that causes changes in the topological short-range order and annealing out of free volume is observed. This behaviour was confi rmed by modifications of the shapes of hyperfi ne field distributions derived from the corresponding Mössbauer spectra of the investigated alloys. The Curie temperatures of the as-quenched and annealed Fe51Co12Si16B8Mo5P8 alloy at 573 and 773 K are 400, 405 and 421 K, respectively.
    Źródło:
    Nukleonika; 2017, 62, 2; 85-89
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Co, Ni, and Cr addition on microstructure and magnetic properties of amorphous and nanocrystalline Fe86−xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys
    Autorzy:
    Łukiewska, A.
    Świerczek, J.
    Hasiak, M.
    Olszewski, J.
    Zbroszczyk, J.
    Gębara, P.
    Ciurzyńska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/147169.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    amorphous materials
    nanocrystalline materials
    Mössbauer spectroscopy
    invar effect
    Curie temperature
    Opis:
    Mössbauer spectra and thermomagnetic curves for the Fe86-xMxZr7Nb2Cu1B4 (M = Co, Ni, CoCr, and Cr, x = 0 or 6) alloys in the as-quenched state and after the accumulative annealing in the temperature range 600–800 K for 10 min are investigated. The parent Fe86Zr7Nb2Cu1B4 amorphous alloy is paramagnetic at room temperature, and substitution of 6 at.% of Fe by Co, Ni, and CoCr changes the magnetic structure – the alloys become ferromagnetic, whereas replacing 6 at.% of Fe with Cr preserves the paramagnetic state. After the heat treatment at 600 K, the decrease of the average hyperfi ne fi eld induction, as compared to the as-quenched state, is observed due to the invar effect. After this annealing, the Curie temperature for all investigated alloys decreases. The accumulative annealing up to 800 K leads to the partial crystallization; α-Fe or α-FeCo grains with diameters in the range of 12–30 nm in the residual amorphous matrix appear.
    Źródło:
    Nukleonika; 2015, 60, 1; 103-108
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hyperfine interaction and some thermomagnetic properties of amorphous and partially crystallized Fe70−xMxMo5Cr4Nb6B15 (M = Co or Ni, x = 0 or 10) alloys
    Autorzy:
    Rzącki, J.
    Świerczek, J.
    Hasiak, M.
    Olszewski, J.
    Zbroszczyk, J.
    Ciurzyńska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/148195.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    amorphous alloys
    magnetic properties
    X-ray diffraction
    Curie temperature
    Opis:
    As revealed by Mössbauer spectroscopy, replacement of 10 at.% of iron in the amorphous Fe70Mo5Cr4Nb6B15 alloy by cobalt or nickel has no effect on the magnetic structure in the vicinity of room temperature, although the Curie point moves from 190 K towards ambient one. In the early stages of crystallization, the paramagnetic crystalline Cr12Fe36Mo10 phase appears before α-Fe or α-FeCo are formed, as is confi rmed by X-ray diffractometry and transmission electron microscopy. Creation of the crystalline Cr12Fe36Mo10 phase is accompanied by the amorphous ferromagnetic phase formation at the expense of amorphous paramagnetic one.
    Źródło:
    Nukleonika; 2015, 60, 1; 121-126
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study of ZnO:Co thin films grown by the PLD method
    Autorzy:
    Cieniek, B.
    Stefaniuk, I.
    Virt, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146744.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron paramagnetic resonance (EPR)
    diluted magnetic semiconductor (DMS)
    ZnO:Co
    Curie temperature
    Opis:
    We have studied magnetic properties of zinc-oxide composite doped with a relatively high concentration (4%) of Co ions. Samples were obtained by the pulsed laser deposition (PLD) method with different parameters of the laser ablation. For various samples, the power of laser was changed as well as the temperature of sample heating. Electron paramagnetic resonance (EPR) measurements were carried out and temperature dependence of the EPR spectra was obtained. Analysis of the temperature dependences of the integral intensity of EPR spectra was carried out using the Curie-Weiss law. Fitting yields the following values θCW = 150 K and C = 1.6710, where C is the Curie constant, and θCW is the paramagnetic Curie temperature.
    Źródło:
    Nukleonika; 2013, 58, 3; 359-363
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Marie Skłodowska-Curie: teacher, mentor, research center founder, and “la Patronne
    Autorzy:
    Hoffman, D. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/146680.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    1903 Physics Nobel Prize
    1911 Chemistry Nobel Prize
    marriage of Maria Skłodowska and Pierre Curie 1985
    polonium and radium discoveries 1898
    1906 death of Pierre Curie
    Laboratory Director 1904-1934
    Opis:
    This year (2011) marks the 100th Anniversary of the award of the Nobel Prize in Chemistry to Marie Skłodowska-Curie for her discoveries of radium and polonium and her studies of their properties. The United Nations has proclaimed 2011 as the “International Year of Chemistry”, partly in recognition of this 100th anniversary. A resolution of the Sejm of the Republic of Poland has also established 2011 as the Year of Maria Skłodowska-Curie. Marie Curie has been celebrated this year by a host of prestigious societies and in many countries all around the world for winning Nobel Prizes in both Physics (1903), for the discovery of radioactivity together with husband Pierre Curie and Henri Becquerel, and Chemistry (1911). She was the first woman to win Nobel Prizes in both Physics and Chemistry and the only one to date to win prizes in both physics and chemistry. Also remarkable was that after Pierre Curie’s tragic and untimely death in 1906, she was put in charge of his lectures and laboratory, thus marking the first time in France that a woman occupied such a prestigious academic position, and opening the way for other women to follow. The current article will focus on some of the other notable accomplishments of Marie Curie that are not as commonly recognized, including her organizational and persuasive abilities, and her unique contributions as a teacher, mentor, research center founder, and laboratory “la Patronne”.
    Źródło:
    Nukleonika; 2011, 56, 3; 195-202
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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