Wavelength dependance in laser floating zone processing. A case study with bi‐SR‐CA‐CU‐O superconductors*

Fuente, G.F. de la; Díez, J. C.; Angurel, L.A.; Peña, J. I.; Sotelo, A.; Navarro, Rafael

doi:10.1002/adma.19950071008

Cited by 63 publications

(48 citation statements)

References 30 publications

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“…This phase appears in all the samples, except in the one grown at 5 mm/h, due to the low growth speed which can promote a higher reaction between secondary phases in the heat-affected zone after the solidification process. Other interesting feature observed for this phase is that it is initially well aligned with the rod axis (at 15 mm/h growth rate), as expected from the flat solidification interface observed in the growth process [26], with an increased misalignment when the growth speed is raised. White phase (marked as #2) shows a composition close to the ideal Bi-2201 stoichiometry.…”

Section: Methodsmentioning

confidence: 65%

Relationship Between Growth Speed and Magnetic Properties in Bi-2212/Ag Textured Composites

Özkurt

Madre

Sotelo

et al. 2012

J Supercond Nov Magn

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In this paper, the magnetic properties of Bi 2 Sr 2 CaCu 2 O x /3 wt.%Ag textured composite materials prepared by a LFZ melting technique at different growth speeds (5, 15, 30 and 60mm/h) are presented. X-ray diffraction patterns showed that in all cases the Bi-2212 phase is the major one. The magnetization measurements have been carried out as a function of the magnetic field up to 10 kOe. J c values of the samples calculated using Bean's model indicate that the different growth speeds have significant effect on the J C values. It has been found that the maximum critical density J C , 4.42x10 5 A/cm 2 at 10K, has been obtained for the 15 mm/h grown sample.

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Section: Methodsmentioning

confidence: 65%

Relationship Between Growth Speed and Magnetic Properties in Bi-2212/Ag Textured Composites

Özkurt

Madre

Sotelo

et al. 2012

J Supercond Nov Magn

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“…Applications of these materials as (5). Radiation of 1.06 mm (Nd:YAG) seems to be more appropiate than 10.6 mm radiation (C0 2 ) for BSCCO superconductors on the basis of the different degrees of texture observed (1).…”

Section: Extended Abstractmentioning

confidence: 88%

“…The photographs (Figure 1) show selected regions of transverse (a, b and c) and longitudinal (d) sections of typical eutectic fibers grown by the LFZ method using a C0 2 láser system described elsewhere (1). Applications of these materials as (5).…”

Section: Extended Abstractmentioning

confidence: 99%

Properties of ceramic oxides processed by laser

Virto¹,

Peña²,

Díez³

et al. 1998

REVMETAL

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Láser tloating zone melting method is of relevant importance. The high absorbance of the energy generated by C0 2 and Nd:YAG láser systems into ceramics specimens allows its transformation in monocrystals structures (Zr0 2 or A1 2 0 3 ), in eutectic crystals (Zr0 2 -Ca), or in textured polycrystal as Bi 2 Sr 2 CaCu 2 0 8 . The flexible control of láser parameters allows to obtain products with interesting properties.Keywords: Láser floating zone. C0 2 láser. Nd:YAG láser. Ceramics. Propiedades de óxidos cerámicos procesados con láserResumen La utilización de equipos láser como fuente de calor para el procesado de cerámicas presenta importantes ventajas, como el alcanzar temperaturas muy elevadas, próximas a los 3000 C, efectuar tratamientos muy localizados en superficies sin afectar el volumen del material, así como la realización de tratamientos en zonas de difícil acceso, entre muchas otras. La fusión zonal asistida por láser constituye actualmente una de las técnicas más versátiles en el campo del crecimiento cristalino; la elevada absorción de la energía láser generada con sistemas C0 2 y YAG:Nd en el interior de un compacto cerámico permite su eficaz transformación en monocristal, como es el caso del Zr0 2 y A1 2 0 3 , eutéctico monocristalino de dos o más fases, caso del Zr0 2 -CaO, o policristal texturado como el superconductor Bi 2 Sr 2 CaCu 2 0 8 . La flexibilidad de control de los parámetros de crecimiento permite obtener productos con propiedades muy atractivas para su utilización en dispositivos de diversa naturaleza y de gran interés comercial.Palabras clave: Fusión zonal. C0 2 láser. Nd:YAG láser. Cerámicas.

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“…The above coatings were subsequently processed using two LASER heating techniques described previously (14,15). On the one hand, Laser Induced Zone Melting was applied on a XY-coordinate axis table on which the CO 2 LASER (Laser Quanta, λ = 10.6 µm) was programmed to incide, adjusting the Laser beam focusing area to a thin long line (aprox.…”

Section: Methodsmentioning

confidence: 99%

Tratamiento de depósitos electroforéticos de YBa2Cu3O7 sobre substratos policristalinos mediante fusión zonal por láser

Tejada-Rosales¹,

Ondoño-Castillo²,

Díez³

et al. 2002

Bol. Soc. Esp. Ceram. Vidr.

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Obtaining coatings on metallic substrates of irregular geometries is not easy by traditional methods. In those cases electrochemical methods show important advantages and have been used successfully. To date only silver has shown to be inert with respect to superconducting cuprates, although progress has been made in the development of intermediate buffer layers. However, in the particular case of YBa 2 Cu 3 O 7 , annealing above the cuprate superconducting melting point to attempt densification or texturing is hard on silver because of the lower melting point of the metal. . Focalized heating of superconducting oxides over metallic substrates, using LASER techniques on controlled geometries, allows densification of coatings. The Laser processed sample may be amorphous but the crystallinity is easily recovered, as well as the optimal oxygen content for the oxide, but the preferential orientation induced by the electrophoretic deposition is lost upon the recrystallization process occurring over polycrystaline substrates. Keywords: superconductors, electrochemistry, electrophoresis, annealing, LFZTratamiento de depósitos electroforéticos de YBa 2 Cu 3 O 7 sobre substratos policristalinos mediante fusión zonal por láser La realización de depósitos de óxidos superconductores sobre substratos metálicos de geometría compleja y en general policristalinos está prácticamente basada en métodos electroforéticos o electroquímicos que permiten la utilización de un campo eléctrico de geometría definida para inducir el movimiento de partículas de óxido o de precursores de éste, hacia el electrodo elegido. Dichos métodos son fundamentales cuando el substrato es metálico o puede hacerse metálico con facilidad. Hasta el presente tan sólo la plata ha mostrado ser lo suficientemente inerte para permitir recocidos posteriores, aunque se está progresando en el desarrollo de capas "buffer". Sin embargo, cuando el óxido depositado es YBa 2 Cu 3 O 7 , el proceso de recocido posterior no permite la obtención de textura sobre Ag mediante métodos térmicos dado el inferior punto de fusión de este metal. El presente trabajo presenta un estudio de fusión zonal por láser que permite recocer el óxido sin fundir el substrato metálico de plata. El control de las distintas variables permite llegar a una solución en la que se puede preservar la naturaleza superconductora del depósito y su densificación. Ello requiere un tratamiento térmico posterior que recupera la cristalinidad y el contenido óptimo de oxígeno. Sin embargo, el tratamiento disminuye la orientación preferencial de las partículas de YBa 2 Cu 3 O 7 que se obtiene mediante la deposición electroforética.

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Wavelength dependance in laser floating zone processing. A case study with bi‐SR‐CA‐CU‐O superconductors*

Cited by 63 publications

References 30 publications

Relationship Between Growth Speed and Magnetic Properties in Bi-2212/Ag Textured Composites

Relationship Between Growth Speed and Magnetic Properties in Bi-2212/Ag Textured Composites

Properties of ceramic oxides processed by laser

Tratamiento de depósitos electroforéticos de YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> sobre substratos policristalinos mediante fusión zonal por láser

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