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    Wyświetlanie 1-7 z 7
    Tytuł:
    Changes in YBCO Single Grain Bulk Superconductor Exposed to Air Moisture
    Autorzy:
    Piovarči, S.
    Antal, V.
    Kaňuchová, M.
    Radušovská, M.
    Diko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1202072.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.-q
    68.43.-h
    68.37.-d
    Opis:
    Changes in bulk single grain YBCO superconductor at exposition to air were studied. The increase of the sample weight caused by reaction with air moisture was observed by weighing the samples over two months period. Thermal analyses and mass spectrometry of the exposed samples has shown evolution of water and oxygen during sample heating. Observation with scanning electron microscope confirmed the formation of some nanosize phases at the inner sample surfaces. XPS spectra done on the freshly cleaved and on the air exposed (001) surfaces confirmed changes in Ba and Cu bonds. Observed structural changes did not caused systematic changes in measured trapped field.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 364-365
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Doped YBCO Superconductor Crystal Structure Simulation
    Autorzy:
    Kavečanský, V.
    Diko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535386.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.C-
    74.62.Dh
    74.72.-h
    Opis:
    Pinning process plays an important role in improving utility properties of $YBa_2Cu_3O_{7-δ}$ (YBCO) superconductors. As a consequence of the low coherent length, the most effective pinning centers in such type of materials should have nanometer size dimensions. An efficient way of introducing such centers can be a chemical substitution in the YBCO lattice. Computer simulation of locally distorted YBCO crystal structure due to the substitutions has been performed.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1034-1035
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clean bulk YBaCuO superconductors doped by paramagnetic ions of Sm and Yb
    Autorzy:
    Jirsa, M.
    Volochová, D.
    Kováč, J.
    Diko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054700.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.25.Op
    74.25.Sv
    74.60.Ge
    74.72.-h
    Opis:
    The recently developed clean cuprate technology was employed to study the effect of tiny amounts of paramagnetic Yb and Sm ions on electromagnetic properties of bulk YBaCuO. Small samples of about 1.5×1.5×0.5 mm³ were measured by vibrating sample magnetometer in the field range ±9 T and temperatures 30 K to 10 K in the non-superconducting tetragonal state and 300 K to 70 K in the orthorhombic, superconducting state. In the latter case, we observed the reversible paramagnetic moment above T_{C}, similar as in the tetragonal state. Below T_{C} an irreversible magnetic moment was observed from which critical current density, J_c, was evaluated using the extended Bean model. The effect of doping by Yb and Sm ions on J_c was studied and a correlation between J_c and the total paramagnetic moment was found. Both J_c(B) and the normalized pinning force density as a function of the reduced magnetic field were analyzed in terms of the classical model and discussed with respect to the material anisotropy, giving us at least a rough idea on the type of the effective pinning type and mechanism.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1027-1029
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trapped field of YBCO bulk superconductors prepared by infiltration growth process
    Autorzy:
    Vojtkova, L.
    Diko, P.
    Piovarči, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054776.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.81.Bd
    61.50.-f
    74.25.Ha
    81.10.Fq
    Opis:
    Single grain Y₁Ba₂Cu₃O_{7-x} (YBCO) bulk superconductors were prepared from different starting precursors. In the first case, Y₂Ba₁Cu₁O₅ (Y211) powder as the solid phase and the liquid phase of mixture of YBa₂Cu₃O_{7-x}+BaCuO₂+CuO powders were used. In the second case, the solid phase was prepared from the mixture of Y₂O₃+BaCuO₂ instead of the conventionally used Y211, and as the liquid phase a mixture of Y₂O₃+BaCuO₂+CuO powders was used. The trapped field measurements at 77 K were performed and microstructure of samples was studied by polarized light microscopy. The positive influence of Y₂O₃+BaCuO₂ starting precursor on the oxygenation, Y211 particle refinement and measured trapped field is shown.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1048-1050
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic Properties of Melt-Grown YBaCuO Superconductors Doped by Gd and Sm
    Autorzy:
    Jirsa, M.
    Rameš, M.
    Volochová, D.
    Radušovská, M.
    Diko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371409.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.25.Op
    74.25.Sv
    74.60.Ge
    74.72.-h
    Opis:
    Electromagnetic properties of $YBa_{2}Cu_{3}O_{y}$ samples melt-grown in air and doped with small amounts of light rare earth (LRE) ions Gd and Sm were studied. The LRE doping creates a point-like disorder contributing to the second peak on the magnetization curve. In the field range of the second peak the average magnetic moment, $M_{av}$, deduced from the magnetization curves exhibited strong fluctuations. $M_{av}$ is commonly regarded as an equilibrium moment close to the thermodynamic reversible one, obeying in intermediate fields a logarithmic field dependence. However, in our experiments $M_{av}(B)$ curves failed to follow such a dependence below irreversibility line. $M_{av}(B)$ curves deduced from rather static measurements, done by SQUID magnetometer still showed the disturbance but significantly weaker. It indicates that this feature reflects the vortex dynamics in the second peak region. Its scaling with temperature was found to coincide with that of the pinning force.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 326-327
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of Sm addition on the microstructure and superconducting properties of YBCO bulk superconductors
    Autorzy:
    Volochová, D.
    Diko, P.
    Piovarči, S.
    Antal, V.
    Kováč, J.
    Jirsa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054772.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.62.Dh
    81.10.Fq
    61.72.-y
    74.25.Ha
    74.25.Sv
    Opis:
    The effect of Sm addition on the microstructure and superconducting properties of Y-Ba-Cu-O (YBCO) bulk superconductors has been studied. Nominal composition: 1 mol YBa₂Cu₃O_{7-δ} + 0.25 mol Y₂O₃ + 1 wt% CeO₂ was enriched with different amounts of SmBa₂Cu₃O_y powder with the aim to increase critical current density, J_c, especially in higher magnetic fields by introducing additional pinning centers. Single grain YBCO bulk superconductors with SmBa₂Cu₃O_y (Y123-Sm) addition were prepared by the optimized top seeded melt growth process. Microstructure analysis, performed by polarized light microscope, revealed that SmBa₂Cu₃O_y addition leads to a higher amount of slightly coarser Y₂BaCuO₅ particles, which is related to lower critical current densities (J_c ≈ 6×10⁴ A/cm²) of the YBCO samples with SmBa₂Cu₃O_y addition in low magnetic fields. On the other hand, an enhancement of critical current density, J_c, in higher magnetic fields was observed for Y123-Sm samples. Moreover, a maximum trapped magnetic field, B_{tmax}, of 564 mT at 77 K in Y123-Sm, x=0.0025 sample (Ø 17.2 mm) was 43% higher than that for YBCO sample without any addition.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1009-1011
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Sm and Yb Pollution on Superconducting Properties of YBCO Bulk Superconductors
    Autorzy:
    Volochová, D.
    Jurek, K.
    Radušovská, M.
    Piovarči, S.
    Antal, V.
    Kováč, J.
    Jirsa, M.
    Diko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371573.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.60.Bf
    74.72.-h
    81.40.Rs
    74.25.Ha
    74.81.Bd
    74.25.Op
    Opis:
    $YBa_{2}Cu_{3}O_{7-δ }$ (YBCO, Y-123) bulk superconductors with a nominal composition $Y_{1.5}Ba_{2}Cu_{3}O_{x}$ and 1 wt% $CeO_{2}$ addition were prepared by the Top Seeded Melt Growth (TSMG) process. Small single-crystalline pieces, cut from the $SmBa_{2}Cu_{3}O_{y}$ (Sm-123) bulk, were used for seeding of epitaxial growth. Wavelength-dispersive spectrometry (WDS) confirmed the presence of 0.1 wt% Sm from the seed and 0.25 wt% Yb from the substrate, practically in the whole sample volume. The influence of this Sm and Yb contamination on superconducting properties of grown bulk materials is reported.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 358-359
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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