Improved microstructure and flux pinning properties of Gd-substituted (Bi,Pb)-2212 superconductor sintered between 846 and 860 °C

Vinu, S.; Sarun, P.M.; Shabna, R.; Biju, A.; Syamaprasad, U.

doi:10.1016/j.matlet.2008.07.052

Cited by 44 publications

(21 citation statements)

References 7 publications

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“…5). Moreover, no secondary phase containing Cr or any other cation is observed even up to x = 1, indicating that the Cr is incorporated into the crystalline structure of the superconductors produced in this work [26][27][28]. The variation of lattice parameters a and c with Cr content in Bi 1.6 Pb 0.5 Sr 2 Pr x Ca 1.1 Cu 2.1 O y is depicted in Table 1.…”

Section: Xrd Analysesmentioning

confidence: 71%

“…The variation of lattice parameters a and c with Cr content in Bi 1.6 Pb 0.5 Sr 2 Pr x Ca 1.1 Cu 2.1 O y is depicted in Table 1. As seen from the table, the lattice constant, a, increases [29][30][31][32] while the lattice constant, c, decreases with the increase [27,[33][34][35] in the Cr addition. According to these results, the Bi-2212 phase decreases while the Bi-2201 phase starts to increase with the increase of the Cr addition; nevertheless, Fig.…”

Section: Xrd Analysesmentioning

confidence: 83%

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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: Xrd Analysesmentioning

confidence: 71%

Section: Xrd Analysesmentioning

confidence: 83%

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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“…Nearly the same values of U 0 were also obtained by Sharma et al [45] in the measurements up to 14 T on Bi-2212 polycrystalline samples, prepared by sol-gel method and annealed between 760°C and 840°C, where they showed an influence of annealing temperature on U 0 . With lead containing (Bi,Pb)2212 samples doped by a rare earth on Sr site the obtained values are much higher, 0.075 eV to 0.308 eV with an applied field of 0.28 T for Gd doping [40] and 0.077 eV to 0.47 eV with an applied field of 0.32 T and 0.63 T for Tb doping [41].…”

Section: Resultsmentioning

confidence: 92%

“…The pinning properties, expressed in the irreversibility line, have been at this time studied in Y substituted Bi-2212 crystals [33]. To our knowledge, no study has been made before about the effect of Y doping on the activation energy of Bi-2212 ceramic samples as it has been made for undoped Bi-2212 crystal [2], and in more recent works on doped and undoped Bi based polycrystalline samples [41][42][43][44][45]. This effect is presented for the case of Y substitution on the Ca site at the rate varying up to 25 % (x = 0.25), under applied magnetic field having a constant amplitude equal to 0 T, 1 T, 2 T and 3 T.…”

Section: Introductionmentioning

confidence: 99%

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi2Sr2Ca1Cu2O8+δ superconducting ceramics

Menassel

Mosbah

Boudjadja

et al. 2016

Materials Science-Poland

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In high Tc superconductors (HTSC) the activation energy gives information about the pinning properties of a sample under applied magnetic field. Pinning of vortices determines the critical current density Jc which is of great importance for practical applications of HTSC. Instead of magnetic measurements, the activation energy may be calculated from resistivity measurements realized under magnetic field. This kind of measurement has been made in this work for yttrium doped samples of Bi 2 Sr 2 CaCu 2 O 8 + d (Bi-2212) for different values of applied magnetic field. Samples of Bi 2 Sr 2 Ca 1 − x Y x Cu 2 O 8 + d (x = 0, 0.025, 0.1, 0.25) were prepared by a sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive analysis of X-ray. The measurements of resistivity were made using a classical four probe method and DC current. The magnetic field was applied with a constant amplitude of 0 T, 1 T, 2 T and 3 T. The obtained results show that the activation energy decreases with introduction of yttrium, but has a relative maximum when x is equal 0.1. The decrease of the activation energy is explained by the granular nature of the samples which promotes 3D transition to 2D of the vortex lattice.

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“…Introduction of artificial defects, with sizes matching the coherence length, is another method for raising J c values. These defects can be produced by doping, cation substitution, or ion irradiation, producing nanometric ones in the first two cases or columnar defects in the last approach [8][9][10][11][12][13]. Taking into account these different possibilities, it has been reported that properly processed HTSs can reach critical current densities as high as 10 6 Acm -2 below 77 K [14].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of magnetic relaxation behavior by texturing in Bi-2212 superconducting rods

Ozabaci

Kızılaslan

Кират

et al. 2016

Ceramics International

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Time decay of magnetization, known as magnetic relaxation, is crucial for both fundamental and applied point of view in bulk high temperature superconductors (HTS) by setting the limits to the HTS devices stability. Melt-processed Bi 2 Sr 2 Ca 1 Cu 2-x Ga x O 8+δ rods (Bi-2212, x = 0, 0.1) were used to study the effect of both grain alignment and substitution on the samples critical current density, relaxation and pinning behavior. The magnetic field has been applied both perpendicular and parallel to the rods growth axis to determine the effect of grain alignment. It has been found that Ga substitution reduces grains orientation and sizes leading to lower magnetic properties. The peaks of the curves, which indicate the temperature dependence of the samples magnetic relaxation rate (S), have been observed in the 7-35 K temperature range. Characteristic pinning energy (U e /k B ) of samples was determined using the formalism developed by Maley. The change of pinning energy as a function of magnetization has been found to be exponential between 3 and 60 K, which is in agreement with the collective creep theory.

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Improved microstructure and flux pinning properties of Gd-substituted (Bi,Pb)-2212 superconductor sintered between 846 and 860 °C

Cited by 44 publications

References 7 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

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi2Sr2Ca1Cu2O8+δ superconducting ceramics

Enhancement of magnetic relaxation behavior by texturing in Bi-2212 superconducting rods

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