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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effects of Gd/Ba Nonstoichiometry in $Gd_{1+x}Ba_{2-x}Cu_{3}O_{7-δ}$ on Superconducting and Magnetic Properties
    Autorzy:
    Majerová, M.
    Cigáň, A.
    Bystrický, R.
    Maňka, J.
    Dvurečenskij, A.
    Škrátek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371559.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Ha
    75.30.Cr
    75.30.Et
    75.60.-d
    75.60.Ch
    75.60.Nt
    Opis:
    Effects of slight nonstoichiometry in $Gd_{1+x}Ba_{2-x}Cu_{3}O_{7-δ}$ compounds on superconducting and magnetic properties were studied. The series of single-phase samples of $Gd_{1+x}Ba_{2-x}Cu_{3}O_{7-δ}$ with composition deviation x from the stoichiometric value of 0 to 0.1 and to -0.1 were synthesized by the solid-state reaction method from $Gd_{2}O_{3}$, $BaCO_{3}$ and CuO precursors, sintered at the temperature of ~ 1000°C in flowing oxygen and annealed at 450°C for 24 h.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 354-355
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $V_{2}O_{3}$ Nanooxide Prepared Mechanochemically With and Without Salt Matrix
    Autorzy:
    Dvurečenskij, A.
    Billik, P.
    Cigáň, A.
    Bystrický, R.
    Maňka, J.
    Škrátek, M.
    Majerová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1372489.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.25.Dq
    75.75.-c
    61.46.+w
    Opis:
    We present a new technological route of synthesis of $V_{2}O_{3}$ nanocrystals based on mechanochemical reduction of $V_{2}O_{5}$ with $Na_{2}SO_{3}$ as a reductant, followed by low temperature vacuum annealing. The structural and magnetic properties of the $V_{2}O_{3}$ nanocrystals were studied.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 398-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Ru Addition on the Superconducting Properties of the Eu-123 System
    Autorzy:
    Škrátek, M.
    Cigáň, A.
    Dvurečenskij, A.
    Majerová, M.
    Bystrický, R.
    Billik, P.
    Maňka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1384837.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Ha
    75.30.Et
    75.60.-d
    Opis:
    Effects of the Ru addition on the structural and superconducting properties of the Eu-123 system were studied. Samples of the nominal composition $EuBa₂Cu_{3-x}Ru_{x}O_{7-δ}$ with x ranging from 0.0 to 0.7 were prepared by the solid state reaction technique from Eu₂O₃, BaCO₃, CuO and RuO₂ precursors at the temperature of 1050°C for 72 h in flowing oxygen and oxygen-annealed at 580°C for 24 h. X-ray diffraction data show the presence of another Ba-Eu-Ru-O phase, for x ≥ 0.03, in addition to the main superconducting phase. AC and DC magnetization characteristics were measured by the compensation method using the second-order SQUID gradiometer at ≈ 77 K and the QD SQUID magnetometer MPMS XL-7 at 20 K. The superconducting properties, $T_{c}$, $ΔT_{c}$, change only weakly up to x = 0.2, and magnetization M(H) deteriorates with an increasing Ru content.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 225-227
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Studies of $EuBa₂Cu_{3-x}RuₓO_{7-δ}$ Compounds
    Autorzy:
    Dvurečenskij, A.
    Cigáň, A.
    Bystrický, R.
    Škrátek, M.
    Billik, P.
    Majerová, M.
    Maňka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385423.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Ha
    75.30.Et
    75.60.-d
    Opis:
    Effects of Ru addition on magnetic properties of $EuBa₂Cu_{3-x}RuₓO_{7-δ}$ compounds were studied. Samples of $EuBa₂Cu_{3-x}RuₓO_{7-δ}$ with x from 0.00 to 0.70 were prepared by the solid state reaction technique from Eu₂O₃, BaCO₃, CuO and RuO₂ precursors. Temperature dependences of the zero-field cooled (ZFC) and the field cooled (FC) DC magnetic moment at low and high applied magnetic field Hₐ were measured by the QD SQUID magnetometer MPMS XL-7 and AC magnetization $M_{AC}(H)$ curves at 77 K by the compensation method using the second-order SQUID gradiometer. The molar susceptibility χ of the samples was corrected to the effects of the sample holder and diamagnetism and χ* also was corrected to the temperature independent paramagnetic/diamagnetic contribution $χ^{TN}$ and fitted by the Curie-Weiss relation. The values of the Weiss temperature and the effective magnetic moment have been estimated at low and high value of applied magnetic field.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 300-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting and Magnetic Properties of $Sn-Doped EuBa_2Cu_3O_{7-δ}$ Compound
    Autorzy:
    Dvurečenskij, A.
    Cigáň, A.
    van Driessche, I.
    Škrátek, M.
    Majerová, M.
    Bruneel, E.
    Maňka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398306.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Ha
    Opis:
    Influence of Sn-substitution on structural, superconducting and magnetic properties of $EuBa_2Cu_3O_{7-δ}$ (Eu-123) compound was studied by X-ray diffraction and SQUID magnetic measurements. Transition process from normal to superconducting state and temperature dependences of zero field cooling and field cooling characteristics of magnetic moment and magnetization curves were measured and analysed. Samples of the nominal composition of $EuBa_2Cu_{3-x}Sn_xO_{7-δ}$ with x ranging from 0.0 to 1.5 were prepared by the solid state reaction technique. The increasing Sn-content decreases the volume of the main superconducting phase (Eu-123) and for higher Sn-contents, semiconducting tetragonal Eu₃Ba₃Cu₆O₁₄(Eu-336) and Ba-Sn-O phases are the dominant ones.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1045-1047
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Synthetic Gehlenite Glass Microspheres
    Autorzy:
    Majerová, M.
    Dvurečenskij, A.
    Cigáň, A.
    Škrátek, M.
    Prnová, A.
    Kraxner, J.
    Galusek, D.
    Maňka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032688.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Kf
    75.50.Kj
    91.60.Pn
    75.20.-g
    75.50.Lk
    Opis:
    In the paper, gehlenite amorphous microspheres were prepared by the flame synthesis of a powder precursor. In the first step, the precursor was prepared from a stoichiometric mixture of CaCO₃, Al₂O₃ and SiO₂ by a standard solid-state reaction method. Next, the precursor was sprayed into a CH₄-O₂ flame with the temperature of around 2200°C and molten droplets of synthetic gehlenite were rapidly cooled by distilled water. Structural and detailed magnetic properties were studied by the optical microscopy, X-ray diffraction and QD SQUID magnetometer. The gehlenite microspheres show a complex magnetic behaviour that is a function of the temperature and the magnetic field, e.g. diamagnetism and paramagnetism at 300 K and 2 K, respectively.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 699-701
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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