(Bi,Pb)2Sr2Ca2Cu3O10+δ superconductor composites: Ceramics vs. fibers

Huang, Yibing; Fuente, G.F. de la; Sotelo, A.; Badı́a, A.; Lera, F.; Navarro, Rafael; Rillo, C.; Ibáñez, Rafael; Beltrán, Daniel; Sapiña, Fernando; Beltrán, Antonio

doi:10.1016/0921-4534(91)91325-x

Cited by 30 publications

(20 citation statements)

References 3 publications

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“…Due to their high structural anisotropy, the alignment of plate-like grains by mechanical and/or chemical processes is necessary to attain macroscopic properties comparable to those obtained on single crystals. It has been established that the Laser Floating Zone (LFZ) technique is adequate to obtain a good grain orientation in several oxide ceramic systems (9)(10)(11). With the LFZ processing, a reduction of the electrical resistivity is expected.…”

Section: Introductionmentioning

confidence: 99%

Cerámicas termoeléctricas Bi2Ca2Co1.7Ox texturadas mediante fusión zonal flotante inducida por láser

Sotelo¹,

Guilmeau²,

Madre³

et al. 2008

Bol. Soc. Esp. Ceram. Vidr.

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Thermoelectric performance on cobaltite ceramics can be increased raising the electrical conductivity. This can be performed by increasing grain size and aligning them along a preferential direction by the Laser Floating Zone (LFZ) method. In this work, Bi 2 Ca 2 Co 1.7 O x ceramics have been directionally grown at three different speeds, 15, 30 and 50 mm/h. It has been found a small influence of the growth conditions on the thermoelectric properties. In all the cases, the microstructure shows alternated cobaltite layers with small CoO inclusions. In despite, the thermopower is higher than usual in misfit cobaltites obtained by conventional solid state routes. This preliminary result originates probably from oxygen vacancies. Keywords: Electrical properties, cobaltites, thermoelectric power.Cerámicas termoeléctricas Bi 2 Ca 2 Co 1.7 O x texturadas mediante fusión zonal flotante inducida por láser Las prestaciones termoeléctricas de las cerámicas basadas en óxidos de cobalto pueden ser aumentadas por la disminución de la resistividad eléctrica. Esto puede realizarse aumentando el tamaño de grano y alineándolo en una dirección preferencial, utilizando el método de zona flotante inducida por láser (LFZ). En este trabajo, se han crecido cerámicas termoeléctricas de composición Bi 2 Ca 2 Co 1.7 O x a tres velocidades diferentes, 15, 30 y 50 mm/h. Se ha encontrado que las condiciones de crecimiento tienen poca influencia en las propiedades termoeléctricas. En todos los casos, la microestructura está formada por capas alternadas de cobaltitas, con pequeñas inclusiones de CoO. A pesar de ello, el poder termoeléctrico medido es mayor de lo habitual para este tipo de materiales preparados por métodos convencionales en estado sólido. Este resultado preliminar está originado, probablemente, por la formación de vacantes de oxígeno.Palabras clave: Propiedades eléctricas, cobaltitas, poder termoeléctrico.

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Section: Introductionmentioning

confidence: 99%

Cerámicas termoeléctricas Bi2Ca2Co1.7Ox texturadas mediante fusión zonal flotante inducida por láser

Sotelo¹,

Guilmeau²,

Madre³

et al. 2008

Bol. Soc. Esp. Ceram. Vidr.

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“…In this scenario, synthesis methods play an important role on the production of higher homogeneity materials due to the fact that precursors are composed by smaller grains with higher reactivity [5,6]. On the other hand, it is well-known that a good grain orientation is necessary to obtain high electrical current capabilities in these materials [7]. Among other successful techniques to produce well oriented grains, the laser texturing ensures a high degree of texture at relatively high rates [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 98%

“…On the other hand, it is well-known that a good grain orientation is necessary to obtain high electrical current capabilities in these materials [7]. Among other successful techniques to produce well oriented grains, the laser texturing ensures a high degree of texture at relatively high rates [7][8][9][10][11]. Besides these useful methods used in the preparation of ceramic superconductors such as the laser floating zone (LFZ) [12] and the electrically assisted laser floating zone (EALFZ) techniques [13], cation doping [14][15][16][17][18][19][20][21][22][23][24][25][26][27] or metallic additions [28][29][30] can also ensure the important improvements in the basic properties of the BSCCO system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Yb substitution in Bi-2212 ceramics prepared by laser floating zone technique

Özkurt

Özçelık

Madre

et al. 2015

J Mater Sci: Mater Electron

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In the present work, the influence of Yb substitution for Bi on the structural, electrical and magnetic properties of textured Bi-2212 ceramics has been investigated. X-ray diffraction studies indicated that the major peaks correspond to the Bi-2212 phase. The SEM images clearly show that there is an increase in the number of secondary phases with raising Yb content while all samples maintain similar grain morphology. Magnetic analysis of all samples has been done by magnetic hysteresis measurements, indicating that an enhancement in the M-H loops is obtained by a low Yb doping. The critical current density of samples was calculated from the M-H curves by using Bean's critical state model, indicating that sample with 0.05 Yb substitution possesses the highest J c values.

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“…As a consequence, many strategies have been used in order to improve the properties of BSCCO materials. Some of them are related with the preparation of high homogeneous precursors with small particle sizes using different synthetic methods [14][15][16][17] while other ones have been centered on the grain orientation [18][19][20]. Moreover, the effect of cationic substitution on the superconducting properties of these materials has been studied in previous works, as for example Pb 2+ by Bi 3+ [21][22][23], or metallic additions, typically metallic Ag [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Postannealing on Structural and Superconducting Properties of Bi-2212 Ceramics

Özkurt

Madre

Sotelo

et al. 2013

J Supercond Nov Magn

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(Bi,Pb)2Sr2Ca2Cu3O10+δ superconductor composites: Ceramics vs. fibers

Cited by 30 publications

References 3 publications

Cerámicas termoeléctricas Bi<sub>2</sub>Ca<sub>2</sub>Co<sub>1.7</sub>O<sub>x</sub> texturadas mediante fusión zonal flotante inducida por láser

Cerámicas termoeléctricas Bi<sub>2</sub>Ca<sub>2</sub>Co<sub>1.7</sub>O<sub>x</sub> texturadas mediante fusión zonal flotante inducida por láser

Effect of Yb substitution in Bi-2212 ceramics prepared by laser floating zone technique

The Influence of Postannealing on Structural and Superconducting Properties of Bi-2212 Ceramics

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