Chemical Weak-Link Modification Responsible for High Intergrain
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                    in Bi-Based 2223 Superconducting Ceramics Prepared by the “Glassy Route”

Cloots, Rudi; Rulmont, A.; Godelaine, P. A.; Vanderschueren, Hyacinthe; Bougrine, Hassan; Ausloos, Marcel

doi:10.1209/0295-5075/30/8/008

Cited by 6 publications

(7 citation statements)

References 14 publications

(6 reference statements)

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“…At a lower temperature (T Coff ) the percolation transition is marked by a second step, associated with zero resistance when the optimum phase coupling arises between the superconducting grains. It will be seen that the technique which was used in the present work, and in [9], provides informations strictly on the intergrain coupling component of the susceptibility, thus on the percolation transition only.…”

Section: Introductionmentioning

confidence: 82%

“…[7][8] We recently studied a 2223-2212 mixture prepared by the glass route. [9] Thus it is of interest to further probe the intergranular coupling of such 123-211 composites. We do so here for 123-211 magnetically textured composite materials through electrical and magnetic susceptibility measurements as a function of magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…At the percolation threshold however, the induced currents are able to establish a bulk shielding path through the sample by intergrain phase coupling. We emphasize that the field geometry used for this system, and in [9] for 2223-2212 mixture, allows us to study one and only one isolated transition, i.e. that at T Coff .…”

Section: Introductionmentioning

confidence: 99%

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Field percolation and high current density in 80/20 DyBa2Cu3O7 − x/Dy2BaCuO5 bulk magnetically textured composite ceramics

Cloots

Dang

Vanderbemden

et al. 1996

Zeitschrift für Physik B Condensed Matter

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Abstract:We measured the AC susceptibility of magnetically textured (123) 80%/211(20%) DyBaCuO composite in a special set-up in order to enhance the intergrain contribution. The synthesis process led to very clean "weak links" at grain boundaries. At the percolation threshold bulk shielding paths were such that the intergrain critical current density J C was above 10 5 A/cm 2 . The field dependence of J C was understood through an analytical form indicating a distribution of currents similar to the law of clusters at fracture/percolation thresholds.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Field percolation and high current density in 80/20 DyBa2Cu3O7 − x/Dy2BaCuO5 bulk magnetically textured composite ceramics

Cloots

Dang

Vanderbemden

et al. 1996

Zeitschrift für Physik B Condensed Matter

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“…The susceptibility onset occurs at the 2223 phase critical temperature (109.5 K), which corresponds to the inflection point in the ρ(T ) curve (upper maximum of dρ/ dT ). It clearly appears that the intergranular shielding becomes really efficient below the zero-resistivity temperature (100 K), when a percolation path is well established throughout the sample [9,10].…”

Section: Electrical Resistivity and Ac Magnetic Susceptibilitymentioning

confidence: 99%

Magnetic flux penetration and creep in BSSCO-2223 composite ceramics

Vanderbemden

Destombes

Cloots

et al. 1998

Supercond. Sci. Technol.

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Abstract. We have experimentally investigated the magnetic flux penetration through a Bi-2223 polycrystalline superconductor synthesized by a classical solid-state reaction method. Electrical resistance, AC susceptibility, the Campbell method and magnetic flux waveform recordings have been analysed and compared in order to separate clearly intergrain and intragrain contributions. The AC susceptibility frequency dependence has been also examined at T = 77 K in a broad field range (0.01 G< B AC < 100 G). The activation energy as a function of AC applied magnetic field is found to present a pronounced minimum for an induction (8 G) corresponding to full magnetic flux penetration through the intergranular matrix.

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“…The differences are usually ascribed to different preparation methods [1,2]. Among all the factors, it seems that the initial starting compounds can have a special role on determining of properties and microstructure of YBa 2 Cu 3 O 7-δ [3,4].…”

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confidence: 99%

The dependence of the properties of YBa₂Cu₃O_7–δ on the starting Ba compounds

Farbod¹,

Shoushtari

Bajestani

2006

Phys. Status Solidi (c)

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PACS 74.25. Fy, 74.25.Sv, 74.62.Dh, 74.72.Bk Y123 samples were prepared by a solid state method using BaCO 3 , BaO 2 and Ba(NO 3 ) 2 as Ba source under same sintering conditions. The X-ray patterns, T c , J c (77 K), stiffness, room temperature thermopower and lattice parameters were measured for as sintered, underdoped and well oxygenated samples. The results show these parameters are not the same for samples prepared using different Ba sources at different regime, reflecting the effect of Ba source on microstructure of Y123 compound.1 Introduction In spite of numerous experiments on Y123, there are still many questions to be answered and more works are needed to illustrate the mysterious of this compound.The authors, who have worked on Y123, could prepare the single phase of this compound successfully using different preparation methods and different starting sources of Y, Ba and Cu. But it is seen frequently that the results such as T c , J c , oxygen content, stiffness and other parameters are not quite the same. The differences are usually ascribed to different preparation methods [1,2]. Among all the factors, it seems that the initial starting compounds can have a special role on determining of properties and microstructure of YBa 2 Cu 3 O 7-δ [3,4].Agostino et al.[5] prepared the single phase of Y123 using different starting Ba compounds and they found that using Ba nitrate as precursor is the best choice for obtaining good quality superconductor samples.In this work, the single phase of Y123 samples were prepared by solid state method under the same conditions using BaO 2 , BaCO 3 and Ba(NO 3 ) 2 as the starting Ba compound. The samples were characterized by XRD, SEM, T c , J c (77 K), room temperature thermopower and stiffness measurements. The same measurements were performed on underdoped and oxygenated samples.A comparative analysis of results, showed that samples prepared using different Ba sources have their own advantages.

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Chemical Weak-Link Modification Responsible for High Intergrain J _c in Bi-Based 2223 Superconducting Ceramics Prepared by the “Glassy Route”

Cited by 6 publications

References 14 publications

Field percolation and high current density in 80/20 DyBa2Cu3O7 − x/Dy2BaCuO5 bulk magnetically textured composite ceramics

Field percolation and high current density in 80/20 DyBa2Cu3O7 − x/Dy2BaCuO5 bulk magnetically textured composite ceramics

Magnetic flux penetration and creep in BSSCO-2223 composite ceramics

The dependence of the properties of YBa₂Cu₃O_7–δ on the starting Ba compounds

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Chemical Weak-Link Modification Responsible for High Intergrain J c in Bi-Based 2223 Superconducting Ceramics Prepared by the “Glassy Route”

Cited by 6 publications

References 14 publications

Field percolation and high current density in 80/20 DyBa2Cu3O7 − x/Dy2BaCuO5 bulk magnetically textured composite ceramics

Field percolation and high current density in 80/20 DyBa2Cu3O7 − x/Dy2BaCuO5 bulk magnetically textured composite ceramics

Magnetic flux penetration and creep in BSSCO-2223 composite ceramics

The dependence of the properties of YBa2Cu3O7–δ on the starting Ba compounds

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Product

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Chemical Weak-Link Modification Responsible for High Intergrain J _c in Bi-Based 2223 Superconducting Ceramics Prepared by the “Glassy Route”

The dependence of the properties of YBa₂Cu₃O_7–δ on the starting Ba compounds