Laser Induced Cylindrical Zone Melting of Bi2Sr2CaCu2O8+∂ Superconductors

Angurel, L.A.; Díez, J. C.; Fuente, G.F. de la

doi:10.1002/zaac.200900267

Cited by 11 publications

(8 citation statements)

References 27 publications

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“…These results show a similar melting behavior of SSS, CSS5 and CSS7 powders. Taking into account powder properties and processing method requirements, we may conclude that CSS5 presents satisfactory characteristics to be used as precursor for melt-processed Bi-2212 materials, for example, in laser texturing [11,12]. Additional heat treatments do not produce substantial differences in the melting process of these powders.…”

Section: Melting Behavior Of the Analyzed Powdersmentioning

confidence: 99%

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Continuous processing of Bi2Sr2CaCu2O8+δ precursor powders

Laliena

Amaveda

Özçelık

et al. 2018

Ceramics International

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A continuous solid-state process inside a roller furnace has been used to fabricate Bi-2212 powders. These powders were synthesized for their use as precursors to obtain textured monoliths by laser induced directional solidification. A thermal cycle has been defined, which depends on the length of the furnace, the prefixed temperature profile and the velocity of the sample inside the furnace. Powder properties have been studied as a function of the number of processing cycles. Phase evolution has been analyzed using X-ray diffraction, while other relevant properties of the powders, including grain size distribution, thermal behavior and temperature dependence of the AC susceptibility, have also been measured. These properties have been compared with those of commercial powders and precursors prepared using a standard solid-state protocol. Textured samples using these continuous solid-state precursors exhibit superconducting properties comparable to those similarly processed but prepared from commercial powders.

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Section: Melting Behavior Of the Analyzed Powdersmentioning

confidence: 99%

“…As previously reviewed by Angurel et al [11,12], among the texturing methods reported in the literature to produce bulk textured materials, Laser Floating Zone (LFZ) and Laser Zone Melting (LZM) processing methods are appropriate to obtain highly textured BSCCO superconductors with a Bi-2212 stoichiometry.…”

Section: -Introductionmentioning

confidence: 99%

Continuous processing of Bi2Sr2CaCu2O8+δ precursor powders

Laliena

Amaveda

Özçelık

et al. 2018

Ceramics International

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“…Recent advancements published in the literature have demonstrated the advantages of the Laser Zone Melting (LZM) method to process thermal shock sensitive materials, particularly with preheated substrates. Although Larrea and Mora had initially demonstrated the high degree of microstructural control provided by LZM, important improvements were published later, based on the use of preheating and novel optical beam maneuvering and sample translation devices .…”

Section: Introductionmentioning

confidence: 99%

Laser Zone Melting and microstructure of waveguide coatings obtained on soda‐lime glass

Rey-García

Flores-Arias

Estepa

et al. 2017

Int J of Appl Glass Sci

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This study presents a Laser Zone Melting method with potential for producing planar waveguides at large scale, based on the surface coupling of two chemically compatible glass layers which exhibit distinct indices of refraction. The method is based on a recent patent, particularly applicable to process glass and ceramics with low thermal shock resistance. Glass coatings containing 76.24% by weight PbO are thus here reported, as obtained by this method on commercial soda-lime planar glass substrates. Their higher indices of refraction (1.58 vs 1.52 for commercial soda-lime glass) result in attractive waveguiding potential, as demonstrated with measurements using focused light from a He-Ne laser beam. Scanning and transmission electron microscopy studies reveal excellent integration and compatibility between the observed coatings and substrates, where diffusion in the proximity of the interface was studied by EDS analysis. Crystalline phases have not been found within the coating, or within the substrate, as concluded from the absence of Bragg-peaks in XRD experiments.

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“…Lasers are widely used in fabrication of BSCCO rods and coatings while the halogen lamps are mostly preferred in fabrication of BSCCO single crystals in infrared radiation furnaces [6,7]. The main advantage of using laser as heat source in melt processing is the possibility of obtaining very high thermal gradients at the solidification interface, compared to resistive and other type of heaters [8][9][10][11][12][13]. High temperature gradient is a strong requirement to fabricate materials having highly aligned grains in a comparatively fast manner.…”

Section: Introductionmentioning

confidence: 99%

Growth Speed and Substitution Effects on Alignment and Thermal Transport Properties of Bi-2212 Textured Superconductors

Ozabaci

Rasekh

Kızılaslan

et al. 2014

JOM

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Superconducting thin BSCCO rods with nominal compositions of Bi 2 Sr 2 Ca 1 Cu 2-x Fe x O 8+δ (x=0, 0.01, 0.03, 0.05 and 0.1) were fabricated using Laser Floating Zone (LFZ) technique at two different growth speeds, 15 mm/h and 30 mm/h. The influence of growth speed and doping on the grain alignment in the rods were evaluated by means of X-ray pole figure study. The obtained results showed that both applied growth speed and Fe substitution play a crucial role on grain alignment, which is important for technological applications. It was found that the rods grown at 15 mm/h (G15) have stronger orientation than the rods grown at 30 mm/h (G30). However, in contrast to the G15 rods, increased substitution rate improved the orientation in the G30 rods. Another important observation is that the increase on the substitution caused a decrease on the grain size of both G15 and G30 rods. Deterioration of superconducting properties of the rods after substitution was ascribed to both grain size effect and formation of a non-superconducting Fe-rich phase. The influence of an external magnetic field of up to 9 T, applied both parallel and perpendicular to the growth axis of the rods, was also investigated. The highest critical current density (J c. mag) have been calculated to be J c. mag =5.57x10 5 A/cm 2 (at 5 K) for the unsubstituted G15 rod and this value decreased to 3.02x10 5 A/cm 2 (at 5 K) for the unsubstituted G30 rod.

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Laser Induced Cylindrical Zone Melting of Bi₂Sr₂CaCu₂O_8+∂ Superconductors

Cited by 11 publications

References 27 publications

Continuous processing of Bi2Sr2CaCu2O8+δ precursor powders

Continuous processing of Bi2Sr2CaCu2O8+δ precursor powders

Laser Zone Melting and microstructure of waveguide coatings obtained on soda‐lime glass

Growth Speed and Substitution Effects on Alignment and Thermal Transport Properties of Bi-2212 Textured Superconductors

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