Efecto de la adición de Ag en Bi-2212 texturado mediante laser

Mora, M.; Sotelo, A.; Amaveda, H.; Madre, M. A.; Díez, J. C.; Angurel, L.A.; Fuente, Germán F. de la

doi:10.3989/cyv.2005.v44.i4.375

Cited by 46 publications

(20 citation statements)

References 12 publications

(18 reference statements)

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“…Consequently, it can be expected that metallic Ag could be found finely dispersed all along the samples in agreement with previous works [19,20,37,38]. Further Ag addition starts to raise the amount of this secondary phase.…”

Section: Resultssupporting

confidence: 77%

“…In those micrographs, some Ag particles are indicated by arrows in the sake of clarity, as they show nearly the same contrast observed in the thermoelectric phase. Furthermore, these Ag particles show an elongated shape and appear between the thermoelectric grains, probably improving their electrical connectivity, as reported in previous works in similar textured systems [19,20], or in solid state sintered materials [39]. Moreover, Ag addition seems to slightly decrease porosity of samples, probably due to the formation of a eutectic phase, as it was already found in similar systems [38].…”

Section: Resultssupporting

confidence: 63%

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Role of Ag in textured-annealed Bi2Ca2Co1.7Ox thermoelectric ceramic

et al. 2016

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Bi 2 Ca 2 Co 1.7 O x thermoelectric ceramics with small Ag additions (0, 1, 2, 3, 4, and 5 wt.%) have been successfully grown from the melt, using the laser floating zone method and subsequently annealed at 800 ºC for 24 h. The microstructure has shown a reduction of the amount of secondary phases for Ag contents up to 4 wt.%.This microstructural evolution leads to a decrease of the electrical resistivity values until an Ag content of 4 wt.%, whereas Seebeck coefficient has been maintained unchanged. This is in agreement with the presence of metallic Ag in all samples, confirmed not only by Energy Dispersive Spectrometry but also by X-ray photoelectron and Auger spectroscopy. These electrical properties lead to maximum power factor values of about 0.30 mW/K 2 .m at 650 ºC for the 4 wt.% Ag containing samples, which is among the best results obtained for this type of materials.

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Section: Resultssupporting

confidence: 77%

Section: Resultssupporting

confidence: 63%

Role of Ag in textured-annealed Bi2Ca2Co1.7Ox thermoelectric ceramic

et al. 2016

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“…Since the discovery of Bi-based high-temperature superconductors [1], which are among the most promising materials for technological and industrial applications, many experimental studies have been performed [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] in order to improve their critical temperature (Tc), critical current density (Jc), and better understand the structural properties of the system. The BSCCO families can be described by the Bi 2 Sr 2 Ca n-1 Cu n O 2n+4+y general formula, where n=1, 2 and 3.…”

Section: Introductionmentioning

confidence: 99%

Improvement of superconducting properties in Na-doped BSCCO superconductor

Özçelık

Gürsul

Sotelo

et al. 2014

J Mater Sci: Mater Electron

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In this study, the effect of Na substitution on the structural, electrical and magnetic properties of Bi 2 Sr 2 Ca 1-x Na x Cu 2 O 8+y superconductor with x=0.0, 0.05, 0.075, 0.1, 0.15, and 0.2 has been investigated. The effects of partial replacement of Na for Ca have been investigated by electrical resistivity (ρ-T), scanning electron microscopy (SEM), X-ray diffraction (XRD), and magnetic characterizations. XRD results have shown that the Bi-(2212) phase is the major one independently of the Na-concentration. SEM results indicate that the microstructure of samples is improved with increasing of Na-contents. From the electrical resistivity measurements it has been found that Tc is slightly higher than 92 K for Na-concentrations up to 0.20. Moreover, this trend is maintained in the magnetic measurements where the hysteresis loops are increased with increasing Na-concentrations. The maximum calculated Jc, using Bean's model, is around 10*10 6 A/cm 2 at 10 K and ∼ 1000 Oe for the 0.075 Na doped samples.

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“…One of the main advantages of this method is that the materials can be rapidly grown due to the large thermal gradients present at the solid-liquid interface 6 . Furthermore, the LFZ technique has shown to be useful to obtain good textured samples in other systems 7,8 . However, the low slope of the superconducting to normal transition on the electrical current curve, E-I, imposes severe limitations for their application as fault current limiters.…”

Section: Introductionmentioning

confidence: 99%

Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB

Amaveda¹,

Mora²,

Moñux³

et al. 2006

Bol. Soc. Esp. Ceram. Vidr.

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Vitreous cylinders with compositions Bi 2-x Pb x Sr 2 CaCu 2 O y , (x = 0, 0.2, 0.4 and 0.6) were prepared and used as precursors to fabricate textured bars through a laser floating zone melting method (LFZ). The resulting textured cylindrical bars were annealed, followed by their electrical characterization. The microstructure was determined and correlated with the electrical measured properties. The influence of Pb doping on the sharpness of the superconducting to normal transition on the E-I curves has been determined. The sharpest transitions have been obtained for samples doped with 0.4Pb.Keywords: Bi-2212, superconductivity, electrical properties, Pb. Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB.Se han preparado precursores de tipo vítreo en forma de cilindro con composiciones nominales Bi 2-x Pb x Sr 2 CaCu 2 O y , con x = 0, 0.2, 0.4 y 0.6. Estos cilindros se han utilizado como precursores para fabricar barras texturadas por medio de una técnica de fusión zonal inducida por láser (LFZ). Estas barras texturadas se recocieron a diferentes temperaturas y se caracterizaron eléctricamente. Además, se examinó su microestructura para correlacionarla con las propiedades eléctricas medidas. La variación de la transición del estado superconductor al normal se ha relacionado con el dopaje con Pb a través de las curvas E-I. Las mejores transiciones se han obtenido para muestras dopadas con 0.4 Pb.. Bi-2212, superconductividad, propiedades eléctricas, Pb. Palabras clave:

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Efecto de la adición de Ag en Bi-2212 texturado mediante laser

Cited by 46 publications

References 12 publications

Role of Ag in textured-annealed Bi2Ca2Co1.7Ox thermoelectric ceramic

Role of Ag in textured-annealed Bi2Ca2Co1.7Ox thermoelectric ceramic

Improvement of superconducting properties in Na-doped BSCCO superconductor

Variación de las curvas E-I en la transición normal superconductor de cerámicas texturadas BI-2212 por adición de PB

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