Study on the heat treatment condition to improve coupling of grains in Bi2−xPbxSr2CaCu2Oy/Ag tapes

Fujii, Hiroki; Hishinuma, Yoshimitsu; Kitaguchi, Hitoshi; Kumakura, Hiroaki; Togano, K.

doi:10.1016/s0921-4534(99)00621-8

Cited by 38 publications

(20 citation statements)

References 15 publications

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“…Several techniques [6][7][8][9][10][11][12][13][14] have widely been used to improve their superconducting properties for years. Rare-earth addition and substitution are the most commonly used techniques [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Structural and Superconducting Properties of Cr Added Bi-2212 Superconducting Ceramics

Yıldırım

Yücel

Bal

et al. 2011

J Supercond Nov Magn

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This study reports the effect of Cr addition on the structural and superconducting properties of Bi 1.8 Sr 2.0 Crx Ca 1.1 Cu 2.1 O y superconductor with x = 0, 0.1, 0.3, 0.5 0.7, and 1 by means of X-ray analysis (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and resistivity measurements. The samples studied in this work were prepared using the standard solid-state reaction method. Zero resistivity transition temperatures (T c ) are qualitatively estimated from the dc resistivity measurements. The zero resistivity transition temperatures are obtained to decrease from 81 K to 53 K with the increase in Cr addition. Moreover, the phase and lattice parameters were determined from XRD measurements. Based on the refinement of cell parameters done by considering the structural modulation, the Cr addition was confirmed by an increase of the lattice parameter a and decrease of the cell parameter a of the samples in comparison with that of the undoped sample (Cr0). As for the microstructure and element composition analyses on the surface of the samples produced, SEM and EDS measurements were investigated. According to the measurements, not only were the grain sizes of the samples noted to decrease, but also the surface morphology and grain connectivity were obtained to degrade with increase in the

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Section: Introductionmentioning

confidence: 99%

Investigation of Structural and Superconducting Properties of Cr Added Bi-2212 Superconducting Ceramics

Yıldırım

Yücel

Bal

et al. 2011

J Supercond Nov Magn

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“…Also regardless the annealing conditions, the lead-containing glass has significantly better superconducting properties. The reasons of large differences between the two materials have been discussed before but no convincing conclusion has been reached [1,3]. For instance, it has been proposed that in the BiPbSrCaCuO glass-ceramics Ca 2 PbO 4 forms and enhances the oxygen diffusion through the glass [1].…”

Section: Resultsmentioning

confidence: 99%

“…The glass was cut into bars (2 × 1 × 8 mm 3 ) and polished before further annealing. Glass-ceramic samples were produced by annealing at 820…”

Section: Methodsmentioning

confidence: 99%

Superconducting Properties of BiPbSrCsCuO and BiSrCaCuO Glass-Ceramics

et al. 2006

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In this work we study the main differences between the superconducting properties of the Bi4Sr3Ca3Cu4Ox and (Bi0.8Pb0.2)4Sr3Ca3Cu4Ox glass-ceramics. The Bi 4 Sr 3 Ca 3 Cu 4 O x and (Bi 0.8 Pb 0.2 ) 4 Sr 3 Ca 3 Cu 4 O x glass--ceramics prepared in the same conditions contain similar amounts of the superconducting 2212 phase, however their superconducting and normal--state electrical properties differ significantly. The main reason which makes BiSrCaCuO glass-ceramics worse superconductor than BiPbSrCaCuO is its microstructure.

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“…For years, researchers have tried to improve their superconducting properties by using several techniques [12][13][14][15][16][17][18][19][20]. The improvement of the critical current density means the enhancement of trapped flux in the superconductor material [21,22] and single domain structure [23,24].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Gd Addition Added on Magnetic and Structural Properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Gd x O y Superconductors by ac Susceptibility

Yıldırım

Zalaoğlu

Akdoğan

et al. 2011

J Supercond Nov Magn

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This study reports the effect of Gd addition on magnetic and structural properties of Bi 1.8 Pb 0.35 Sr 1.9 Ca 2.1 Cu 3 Gd x O y superconductor with x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5 by means of ac susceptibility measurements at various ac fields (ranging from 270 to 1352 A/m) and scanning electron microscopy (SEM) images. Critical onset (T on c ) and loss peak temperatures (T p ) were qualitatively estimated from the ac susceptibility curves. The peak temperature at zero acmagnetic field (T p0 ) and intergrain critical current densities (J c ) were theoretically calculated from the ac susceptibility plots via the critical state models. The results show that peak temperatures and critical current densities were found to decrease with increasing Gd addition. Moreover, using a self-field approximation together with J c dependence on temperature, the characteristic length (L c ) associated with the pinning force is estimated to be approximately the same as the average grain size (R g ) of the pinning center because of the linear decrease in J c with increasing temperature. Surface morphology and grain connectivity of the samples were also obtained to degrade with increase in the Gd addition from SEM investigations.

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Study on the heat treatment condition to improve coupling of grains in Bi2−xPbxSr2CaCu2Oy/Ag tapes

Cited by 38 publications

References 15 publications

Investigation of Structural and Superconducting Properties of Cr Added Bi-2212 Superconducting Ceramics

Investigation of Structural and Superconducting Properties of Cr Added Bi-2212 Superconducting Ceramics

Superconducting Properties of BiPbSrCsCuO and BiSrCaCuO Glass-Ceramics

Investigation of Gd Addition Added on Magnetic and Structural Properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Gd x O y Superconductors by ac Susceptibility

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