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Wyszukujesz frazę "Piovarči, S." wg kryterium: Autor


Wyświetlanie 1-4 z 4
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:
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:
Microstructure and Properties of Y-123/Y-211 Bulk Superconductors with $BaCeO_{3}$ and $BaO_{2}$ Addition
Autorzy:
Zmorayova, K.
Antal, V.
Radusovska, M.
Piovarci, S.
Volochova, D.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1371616.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.25.Ha
74.62.Bf
74.62.Dh
81.10.Fq
81.30.Fb
Opis:
$YBa_{2}Cu_{3}O_{7-δ}$ (YBCO) bulk single-grain superconductors were prepared by a TSMG process. $CeO_{2}$, $BaCeO_{3}$ and $BaO_{2}$ powders were added to nominal composition $Y_{1.5}Ba_{2}Cu_{3}O_{7}$ with the aim to refine $Y_{2}BaCuO_{5}$ (Y-211) secondary particles. Added powders were refined by milling in a friction milling and characterized by X-ray powder difractometry. Thermal properties of the systems were characterized by DTA. Microstructure of samples was studied by PLM. Successful refinement of Y-211 particles size was confirmed by IP measurements. Transition temperatures and field dependences of the magnetic moment for further determination of the critical current densities were obtained using a VSM.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 366-367
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth Rate of $YBa_2Cu_3O_7$ Bulk Crystals in $Y_{1.5}Ba_2Cu_3$ System with $CeO_2$ Addition
Autorzy:
Zmorayová, K.
Šefčiková, M.
Volochová, D.
Kalmanová, M.
Piovarči, S.
Diko, P.
Powiązania:
https://bibliotekanauki.pl/articles/1418272.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.62.Bf
74.62.Dh
81.10.Fq
81.20.Ev
81.30.Fb
Opis:
The growth rate of $Y_1Ba_2Cu_3O_{x}$ bulk single grain (in fact single crystal) superconductors in the system with composition $Y_{1.5}Ba_2Cu_3O_{x}$ and $CeO_2$ addition was studied in the temperature range 991-1001°C. It is shown that the growth rate of bulk crystal is different for a- and c-growth direction. Slower measured growth rate in studied system than in pure $Y_1Ba_2Cu_3O_{x}$ is related to the composition shift to the three-phase field containing CuO.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 725-727
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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