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Nguyen-van-Huong, C; Hinnen, C.; Siffre, J. M.

doi:10.1023/a:1018571832434

Cited by 40 publications

(27 citation statements)

References 29 publications

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“…The lattice parameter calculations were based on orthorhombic symmetry assumed for (Bi,Pb)-2212. It is observed that the substitution of rare earths in Bi-2212 causes contraction of c-axis length as reported in some of the earlier works [24][25][26][27]. This contraction in c-axis length also shows that the doped atoms enter into the crystal structure.…”

Section: Methodssupporting

confidence: 72%

“…Bi, Ca, and Sr. We choose the doping amount of Yb as 0. 25 ichiometric level because for Yb the maximum T C and J C have been obtained in this range [22][23][24]. We show that Yb substitution at these cationic sites in (Bi,Pb)-2212 leads to significant improvement in the flux pinning strength of the samples along with increase of T C and J C. Most of the reported studies on the flux pinning have been conducted by estimating the magnetic J C by dc magnetisation measurement.…”

Section: Introductionmentioning

confidence: 69%

“…Studies show that addition or substitution of rare earths in Bi-2212 enhances its superconducting properties such as J C , and T C . These substitution studies using rare earths on Ca, and Sr sites of (Bi,Pb)-2212 show that in the case of most of the rare earths the T C , and J C become maximum when the doping amount is between 0.2 and 0.3 in the stoichiometric level, irrespective of the site it is substituted [20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Flux pinning properties of Yb substituted (Bi,Pb)-2212 superconductor

Biju

Sarun

Aloysius

et al. 2008

Journal of Alloys and Compounds

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Section: Methodssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Flux pinning properties of Yb substituted (Bi,Pb)-2212 superconductor

Biju

Sarun

Aloysius

et al. 2008

Journal of Alloys and Compounds

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“…Thus the carrier concentration increases. And the change of carrier concentration is crucial for the superconducting properties of Bi-2212 [34].…”

Section: Resultsmentioning

confidence: 99%

Influences of Ca nonstoichiometry on the superconducting properties of Bi-2212 superconducting bulks

Zhang

Hao

et al. 2015

J Mater Sci: Mater Electron

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Polycrystalline bulks of Bi 2 Sr 2 Ca x Cu 2.0 O 8?d (Bi-2212) with x = 0.90, 0.95, 1.00 and 1.05 were fabricated by spark plasma sintering technique. The influences of Ca nonstoichiometry on the microstructures, carrier concentration, as well as the related superconducting properties were systematically investigated. XRD analyses revealed the corresponding change of lattice parameters of Bi-2212 phase with the Ca nonstoichiometry. The average particle radius in the sintered bulks underwent an obvious change with the increase of Ca content, which could be attributed to the variation of thermodynamic properties. AC susceptibility measurements exhibited the optimization of intergrain connections in Ca = 0.95 bulk, which lead to the optimization of both self-and in-field critical current density, J c of this system. The optimization of microstructures also caused the enhancement of surface pinning. Based on the enhancements of both intergrain connections and flux pinning properties, an obvious improvement of critical current density was obtained with the optimal doping content of Ca = 0.95.

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“…Namely, the presence of the different aliovalent substitutions through the Bi-2223 crystal structure results in the positive charge in the oxygen deficient Bi-O double layers, and so the positive charge appeared needs to be balanced by the valency/oxygen for the charge neutrality [24][25][26][27][28]. Hence, the interlayer distances between the Cu-Ca-Cu and Ca-Sr sites in the layered structure enlarge; however, the interlayer spaces of the Sr-Bi, Bi-Bi and Sr-Bi-Bi-Sr sites shorten automatically, so does c cell parameter [29]. Moreover, it is natural to confirm that the required extra energy for the bond formation gives rise to the contraction (from 37.02 to 30.72 Å ) of the c-axis length [30].…”

Section: Xrd Measurement Evidencesmentioning

confidence: 99%

Solubility limit of tetravalent Zr nanoparticles in Bi-2223 crystal lattice and evaluation of fundamental characteristic properties of new system

Sarıtekin

Terzioğlu

Pakdil

et al. 2015

J Mater Sci: Mater Electron

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In this comprehensive work, we focus sensitively on the changes of microstructural, electrical, superconducting and mechanical properties belonging to the bulk Bi 1.7 Pb 0.4 Sr 2.0 Ca 2.0 Zr x Cu 3.1 O y materials with the different Zr nanoparticles (0 B x B 1.0) inserted in the superconducting matrix. The characterizations of the materials prepared are experimentally performed by bulk density, dc resistivity (q-T), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), electron dispersive X-ray (EDX) and Vickers microhardness (H v ) investigations. It is found that all the characteristics given above (especially superconducting properties) degrade considerably with the increment in the Zr addition level, and in fact they reach to the global minimum points in case of the maximum dopant level. The main reason of the rapid decrement in the electrical and superconducting properties stems from the presence of the localization problem in the Cu-O 2 consecutively stacked layers. Likewise, the Zr foreign addition increases the artificial random defects, dislocations and grain boundary weak-links in the superconducting system, even being favored by the SEM examinations. At the same time, the EDX surveys indicate that the Zr nanoparticles in the tetravalent state prefer to substitute for the divalent states of the Cu inclusions through the crystal structure as a result of their close ionic radius values (86 pm for Zr 4? ion and 87 pm for Cu 2? ion). Thus, the differentiation of the electronegativity reduces the mobile hole concentration in the Cu-O 2 slabs. Additionally, the XRD experimental findings show that there is a systematic decrement in the Bi-2223 (high) phase up to the Zr concentration level of x = 0.70 beyond which new characteristics peaks of ZrO 2 appear immediately. This is in relation to the fact that the solubility limit corresponding to the Zr foreign impurity in the Bi-2223 system is about x = 0.70. Similarly, the regular decrement in both the c-axis length and crystallite size with the dopant confirms the deterioration of the superconducting properties. Furthermore, the dramatic reduction of the H v values stems from the suppression of the crystallinity and connection quality in the intergrain coupling of the superconducting samples exhibiting typical Indentation Size Effect behavior due to the existence of both elastic and plastic deformations in the system.

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Cited by 40 publications

References 29 publications

Flux pinning properties of Yb substituted (Bi,Pb)-2212 superconductor

Flux pinning properties of Yb substituted (Bi,Pb)-2212 superconductor

Influences of Ca nonstoichiometry on the superconducting properties of Bi-2212 superconducting bulks

Solubility limit of tetravalent Zr nanoparticles in Bi-2223 crystal lattice and evaluation of fundamental characteristic properties of new system

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