Laser technologies applied to the fabrication and characterization of bulk Bi‐2212 superconducting materials for power applications

Angurel, L.A.; Díez, J. C.; Fuente, G.F. de la; Gimeno, F.; Lera, F.; López-Gascón, C.; Martínez, Elena; Mora, M.; Navarro, Rafael; Sotelo, A.; Andrés, Nieves; Recuero, S.; Arroyo, M. P.

doi:10.1002/pssa.200667005

Cited by 23 publications

(18 citation statements)

References 26 publications

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“…In early studies [14,16], it was observed that the BSCCO thin films produced by PLD have exhibited poor supercondu cting properties compared to alternative fabricatio n techniques. It has been recently reported, for example, that high T C and J C values may be obtained for these high-T C materials produced by continuous laser irradiation methods [40][41][42]. On the other hand, it was reported that a significant improvement in supercon ducting propertie s of the thin films could be obtained, deposited by PLD and applying a post-anneal ing heat treatment in an atmosph ere containing a mixture of argon and oxygen (Ar: 93, O 2 : 7) [9,13,15,17].…”

Section: Introductionmentioning

confidence: 99%

The effects of the post-annealing temperature on the growth mechanism of Bi2Sr2Ca1Cu2O8+ thin films produced on MgO (1 0 0) single crystal substrates by pulsed laser deposition (PLD)

Nane

Özçelık

Abukay

2013

Journal of Alloys and Compounds

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a b s t r a c tThe effects of post-annealing temperature were investigated on Bi 2 Sr 2 Ca 1 Cu 2 O 8+o thin films deposited on MgO (1 0 0) substrates by pulsed laser deposition (PLD). The structural and superconducting properties of the films have been determined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), temperature depende nt resistivity (R-T), and DC magnetization measure ments. The films which were deposited at 600 °C were post-annealed in an atmosphere of a gas mixture of Ar (93%) and O 2 (7%), at temperature ranging between 800 and 880 °C. This resulted in films which exhibited a single phase of 2212 with a high crystallini ty (FWHM % 0.16°) and texturing along the c-axis, perpendicular to the plane of the substrate. An optimum temperature of 860 °C was found for the post-annealing thermal treatment. The critical temperature, T C , of the films was measure d as 82 K and the critical current density, J C , was calcu lated as 3 Â 10 7 A/cm 2 for the film annealed at 860 °C.

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Section: Introductionmentioning

confidence: 99%

The effects of the post-annealing temperature on the growth mechanism of Bi2Sr2Ca1Cu2O8+ thin films produced on MgO (1 0 0) single crystal substrates by pulsed laser deposition (PLD)

Nane

Özçelık

Abukay

2013

Journal of Alloys and Compounds

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“…After thermal treatment, typical resistance values of these contacts are below 1 lX. 39 Moreover, for the magnetic measurements, smaller pieces ($0.5 cm long) were cut from as-grown bars and directly subjected to the thermal treatment process. After these annealing processes, some of the samples were kept to be used as reference, while others were subjected to secondary annealing treatments.…”

Section: Methodsmentioning

confidence: 99%

Effect of Secondary Annealing Process on Critical Current Density in Highly Textured Bi-2212 Superconducting System

Aksan

Madre

Rasekh

et al. 2015

JOM

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Bi-2212 samples prepared by a solid-state reaction technique have been grown from the melt using the laser floating zone method. After annealing the as-grown bars, the samples showed a good grain alignment and a high transport critical current density. Secondary annealing processes were performed on the annealed samples with the aim of producing Bi-2212 phase controlled decomposition. Hence, the Bi-2201 phase and the secondary phases, which act as effective pinning centers, were obtained with the secondary annealing process. After these thermal treatments, the transport critical current densities of samples significantly increased, when compared to the annealed ones. The maximum critical current density was achieved when the samples were subjected to secondary annealing at 680°C for 168 h with an improvement of $80%, compared to the annealed ones. Moreover, it was found that magnetization of the secondarily annealed samples was also increased. The magnetic critical current densities in these secondary annealed samples were about 3 times higher than the values obtained for the annealed ones. These results clearly indicate that the secondary annealing processes lead to the formation of effective pinning centers in the bulk material.

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“…In the case of the field parallelly applied with respect to the ab-plane, the current mostly flows along the c-axis and encounters a higher number of grain boundaries due to the intrinsic nature of Bi-2212 phase (see Figure 6b). The preferential growth of this phase is along the ab-plane, which allows the production of grains easily exceeding 100 m in the a-, or b-direction using the LFZ technique [30]. On the other hand, they are in the range of tenths of nm in the c-direction producing a drastic raise on the number of grain boundaries which cause a decrease of J c in this direction.…”

Section: Magnetic Relaxation Investigationsmentioning

confidence: 99%

Enhancement of magnetic relaxation behavior by texturing in Bi-2212 superconducting rods

Ozabaci

Kızılaslan

Кират

et al. 2016

Ceramics International

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Time decay of magnetization, known as magnetic relaxation, is crucial for both fundamental and applied point of view in bulk high temperature superconductors (HTS) by setting the limits to the HTS devices stability. Melt-processed Bi 2 Sr 2 Ca 1 Cu 2-x Ga x O 8+δ rods (Bi-2212, x = 0, 0.1) were used to study the effect of both grain alignment and substitution on the samples critical current density, relaxation and pinning behavior. The magnetic field has been applied both perpendicular and parallel to the rods growth axis to determine the effect of grain alignment. It has been found that Ga substitution reduces grains orientation and sizes leading to lower magnetic properties. The peaks of the curves, which indicate the temperature dependence of the samples magnetic relaxation rate (S), have been observed in the 7-35 K temperature range. Characteristic pinning energy (U e /k B ) of samples was determined using the formalism developed by Maley. The change of pinning energy as a function of magnetization has been found to be exponential between 3 and 60 K, which is in agreement with the collective creep theory.

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Laser technologies applied to the fabrication and characterization of bulk Bi‐2212 superconducting materials for power applications

Cited by 23 publications

References 26 publications

The effects of the post-annealing temperature on the growth mechanism of Bi2Sr2Ca1Cu2O8+ thin films produced on MgO (1 0 0) single crystal substrates by pulsed laser deposition (PLD)

The effects of the post-annealing temperature on the growth mechanism of Bi2Sr2Ca1Cu2O8+ thin films produced on MgO (1 0 0) single crystal substrates by pulsed laser deposition (PLD)

Effect of Secondary Annealing Process on Critical Current Density in Highly Textured Bi-2212 Superconducting System

Enhancement of magnetic relaxation behavior by texturing in Bi-2212 superconducting rods

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