The influence of fast neutron irradiation on the intra- and intergrain properties of the polycrystalline BiPbSrCaCuO system

Wiśniewski, A.; Baran, M.; Kozioł, Z.; Przysłupski, P.; Piechota, Jacek; Puźniak, R.; Pajączkowska, A.; Pȩkała, M.; Pytel, B.; Pytel, Krzysztof

doi:10.1016/0921-4534(90)90332-9

Cited by 26 publications

(3 citation statements)

References 36 publications

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“…The degradation of the critical current density in the low magnetic field regime is attributed to radiation-induced damage of the weak links. Similar observations have been reported previously for transport measurements on irradiated (Bi,Pb) 2 Sr 2 Ca 2 Cu 3 O 10 ceramics [99]. It should be noted, however, that the overall degradation (B = 0) is not too dramatic.…”

Section: Controlled Introduction Of Defects By Irradiation Damage Is ...supporting

confidence: 89%

Introduction of pinning centres into Bi - (Pb) - Sr - Ca - Cu - O superconductors

Dou

Wang

Guo

et al. 1997

Supercond. Sci. Technol.

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High critical current density is essential for most large-scale applications of high-temperature superconductors (HTSs). In addition to the weak link problem, weak flux pinning is a major cause of the rapid decline of with magnetic field at high temperatures. Through intensive research in the past 10 years the weak pinning problem has been partially overcome and has reached a level approaching the requirement for some commercial applications. In this article, a number of techniques by which effective pinning centres can be introduced to improve flux pinning in Bi - (Pb) - Sr - Ca - Cu - O HTSs are reviewed. These include surface pinning through a spiral growth, fine precipitates produced through phase transformation or phase formation - decomposition, inclusions through chemical doping or addition, cascades and columnar defects created by fast-neutron and heavy ion beam irradiation and various defects induced by mechanical deformation. In particular, the results of Bi-2223 formation - decomposition and cold deformation versus hot deformation have a significant implication for HTS wire fabrication. Comparative studies with comprehensive electrical, magnetic and microstructural characterizations have been carried out to assess the effectiveness of these techniques.

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Section: Controlled Introduction Of Defects By Irradiation Damage Is ...supporting

confidence: 89%

Introduction of pinning centres into Bi - (Pb) - Sr - Ca - Cu - O superconductors

Dou

Wang

Guo

et al. 1997

Supercond. Sci. Technol.

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“…The transition temperature shifts gradually with rising fluence from 77 to 72 K for the highest fluence. The roughly estimated superconductivity degradation rate equal to 13 K/1018 cmp2, is higher as compared with values between 2.1 and However, it is comparable with the value of 9.3 K/lO1* cm-, found for Bi based superconductors [24]. This observation may suggest that the hole density in the samples studied is remarkably different from the optimal one, which facilitates a suppression of superconductivity.…”

Section: Discussionsupporting

confidence: 82%

Thermoelectric Power and Thermal Conductivity of Neutron Irradiated Superconductors YBa₂Cu₄O₈

Pȩkała

Morawski

Łada

et al. 1994

Physica Status Solidi (b)

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The first thermoelectric investigation of fast neutron irradiated polycrystalline superconductors Y Ba,Cu,O, reveals that with a rising fluence the absolute values of thermoelectric power increase gradually, the transition temperature shifts from 77 to 72 K, whereas the thermal conductivity diminishes due to the suppression of electron and phonon mean free paths by the defects created in the CuO, layers.

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“…At fixed field orientation, but at lower temperatures, these ''crossover'' fields are found to shift to the right, i.e., flux pinning becomes dominating at higher magnetic fields, when the temperature is lowered. Since the small decrease of J c in the low field range is readily attributed to residual damage of the grain boundary structure, which leads to an increase of the normal state resistivity 24 and, consequently, to a decrease of the percolative coupling strength, 5 these results indicate that the current transport in the low field regime is clearly and fully dominated by the intergrain properties of the superconductor and that additional strong pinning defects within the grains are irrelevant in this ͑temperature dependent͒ field range. A summary of results on the crossover fields H gbϪp from grain boundary to flux pinning dominated current transport is presented in Fig.…”

mentioning

confidence: 99%

On the current transport limitations in Bi-based high temperature superconducting tapes

Tönies

Weber

Guo

et al. 2001

Applied Physics Letters

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The transport critical current densities, Jc, of superconducting (Bi, Pb)2Sr2Ca2Cu3Ox/Ag tapes were measured before and after employing a special radiation technique, which leaves the grain boundary properties largely unaffected. We identify two regions separated by a temperature dependent crossover field Hgb−p. In the low field region, Jc is limited by the transport currents across the grain boundaries, which remain unchanged after irradiation. Above Hgb−p, Jc is limited by flux pinning. In this field region, the artificial defects optimize flux pinning and enhance Jc.

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The influence of fast neutron irradiation on the intra- and intergrain properties of the polycrystalline BiPbSrCaCuO system

Cited by 26 publications

References 36 publications

Introduction of pinning centres into Bi - (Pb) - Sr - Ca - Cu - O superconductors

Introduction of pinning centres into Bi - (Pb) - Sr - Ca - Cu - O superconductors

Thermoelectric Power and Thermal Conductivity of Neutron Irradiated Superconductors YBa₂Cu₄O₈

On the current transport limitations in Bi-based high temperature superconducting tapes

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The influence of fast neutron irradiation on the intra- and intergrain properties of the polycrystalline BiPbSrCaCuO system

Cited by 26 publications

References 36 publications

Introduction of pinning centres into Bi - (Pb) - Sr - Ca - Cu - O superconductors

Introduction of pinning centres into Bi - (Pb) - Sr - Ca - Cu - O superconductors

Thermoelectric Power and Thermal Conductivity of Neutron Irradiated Superconductors YBa2Cu4O8

On the current transport limitations in Bi-based high temperature superconducting tapes

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Thermoelectric Power and Thermal Conductivity of Neutron Irradiated Superconductors YBa₂Cu₄O₈