Influence of the micro structure on magnetic-shielding properties of (Bi,Pb)-Sr-Ca-Cu-O superconductor

Plecháček, V.; Pollert, E.; Hejtmánek, J.

doi:10.1016/0254-0584(95)01627-7

Cited by 12 publications

(10 citation statements)

References 6 publications

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“…The same results were established for superconducting disks made from YBCO powder and subjected to perpendicular fields [20,21]. Yet other studies on bulk BSCCO tubes [3,22] measured a field attenuation that decreases with frequency, whereas the attenuation was shown to slowly increase with frequency for a YBCO superconducting tube [23].…”

Section: Introductionsupporting

confidence: 72%

“…In the case of a shield that is initially not magnetized and is subjected to an increasing applied field, the internal field remains close to zero until the applied induction rises above B lim . The field then penetrates the inner region of the shield and the induction increases with the applied field [3][4][5][6][7][8]. A second important factor is the geometrical volume over which a shield of given size and shape can attenuate an external field below a given level.…”

Section: Introductionmentioning

confidence: 99%

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Spectra of quantum systems in superstrong inertial force fields

Денисов¹,

Kravtsov²

2002

Quantum Electron.

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We have experimentally studied the magnetic shielding properties of a cylindrical shell of BiPbSrCaCuO subjected to low frequency AC axial magnetic fields. The magnetic response has been investigated as a function of the dimensions of the tube, the magnitude of the applied field and the frequency. These results are explained quantitatively by employing the method of Brandt (1998 Phys. Rev. B 58 6506) with a J c (B) law appropriate for a polycrystalline material. Specifically, we observe that the applied field can sweep into the central region either through the thickness of the shield or through the opening ends, the latter mechanism being suppressed for long tubes. For the first time, we systematically detail the spatial variation of the shielding factor (the ratio of the applied field over the internal magnetic field) along the axis of a high-temperature superconducting tube. The shielding factor is shown to be constant in a region around the centre of the tube, and to decrease as an exponential in the vicinity of the ends. This spatial dependence comes from the competition between two mechanisms of field penetration. The frequency dependence of the shielding factor is also discussed and shown to follow a power law arising from the finite creep exponent n.

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Section: Introductionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Spectra of quantum systems in superstrong inertial force fields

Денисов¹,

Kravtsov²

2002

Quantum Electron.

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“…the maximum induction that can be strongly attenuated by the shield [1], [2]. Manuscript A number of results can be found in the literature on the magnetic shielding properties of bulk polycrystalline tubes [5], [6], [8]. In our previous work in particular [1], [2], we have studied the magnetic shielding of a Bi-2223 polycrystalline tube subjected to an axial field.…”

mentioning

confidence: 99%

DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes

Fagnard

Denis

Lousberg

et al. 2009

IEEE Trans. Appl. Supercond.

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Abstract-We have studied numerically and experimentally the magnetic flux penetration in highsuperconducting tube subjected to a uniform magnetic field parallel to its long axis. This study is carried in view of designing low-frequency magnetic shields by exploiting the diamagnetic properties of high-superconducting ceramics. We have measured the field attenuation for applied magnetic fields in the frequency range 5 mHz-0.1 Hz by Hall probe measurements and at audio frequencies using a sensing coil. A simple 1D analysis using the Kim critical state model was found to be able to reproduce the experimental data satisfactorily. We have also determined the phase shift between the internal and the applied field both experimentally and numerically. Finally, we have studied the sweep rate dependence of the magnetic shielding properties, using data recorded either at several constant sweep rates d d or at several AC fields of various amplitudes and frequencies. Both methods agree with each other and lead to a -value of the n law equal to 40 at 77 K.

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“…for resistanceless cables above 77 K. However there are some low-J c applications [1][2][3], in particular magnetic shielding at very low frequencies [3][4][5][6]. Most potential applications require a critical current density J c as high as possible, e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Treatment on YBa2Cu3O7-x Thick Films Prepared by Electrophoretic Deposition on Ni and Ag Substrates

et al. 2007

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We have studied the sintering parameters of YBa 2 Cu 3 O 7-x (YBCO) coatings produced by electrophoretic deposition (EPD) on Ag and Ni substrates. The maximal sintering temperature is ~ 930∞C due to partial melting and chemical contamination for Ag and Ni substrates respectively. Increasing the sintering duration does not improve significantly the densification. When Ar sintering atmosphere is used, the coating density is strongly increased on Ag substrates while adhesion is poor on Ni substrates. The Ar-sintered YBCO coating deposited on planar Ag substrate displays a significant magnetic shielding effect for low frequency applied magnetic induction.

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Influence of the micro structure on magnetic-shielding properties of (Bi,Pb)-Sr-Ca-Cu-O superconductor

Cited by 12 publications

References 6 publications

Spectra of quantum systems in superstrong inertial force fields

Spectra of quantum systems in superstrong inertial force fields

DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes

Influence of Thermal Treatment on YBa2Cu3O7-x Thick Films Prepared by Electrophoretic Deposition on Ni and Ag Substrates

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