The effect of Yb addition in Bi2Sr2Ca1 xY bxCu2Oypartial melted thick films

Ilyushechkin, Alexander; Yamashita, Toru; Boskovic, Lucija

doi:10.1088/0953-2048/17/10/022

Cited by 31 publications

(13 citation statements)

References 18 publications

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“…Figure 4 represents the variation of lattice parameter c/c 0 (c 0 is the lattice parameter of the undoped region of the sample) as a function of thickness of the sample, exposed to Au diffusion at 800, 750 and 700 • C for 10 h. The solid curve shows the calculated concentration profile of Au in Bi-2223. The experimental data of figure 4 fit well with the theoretical curve, calculated for D = 1.2 × 10 −8 cm 2 s −1 at 800 • C by using equation (6). The…”

Section: Resultssupporting

confidence: 73%

“…There has been a tremendous amount of work on Bi(Pb)-Sr-Ca-Cu-O (BSCCO) system since its discovery. To improve the superconducting properties, partial substitution and diffusion have been investigated extensively [1][2][3][4][5][6][7][8][9]. Görür et al [10,11] investigated the effect of Ag diffusion on the properties of YBa 2 Cu 3 O 7−x (YBCO) thin films produced by electron-beam deposition techniques and bulk samples.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of the diffusion coefficient of Au in Bi-2223 superconductors

Öztürk¹,

Küçükömeroğlu²,

Terzioğlu³

2007

J. Phys.: Condens. Matter

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Undoped Bi-2223 samples were prepared using a conventional solid-state reaction method. Doping of Au in Bi-2223 was carried out by means of diffusion from an evaporated Au film on pellets. We have investigated the effect of Au diffusion and diffusion-annealing duration on the microstructure and superconducting properties of Au-doped samples by performing x-ray diffraction (XRD), scanning electron microscopy (SEM), dc resistivity and critical current density measurements. Gold diffusion in Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy has been studied over the temperature range 500–800 °C using the technique of successive removal of thin layers and the measurements of lattice parameters from XRD patterns at room temperature. The diffusion doping of Bi-2223 by Au causes a significant increase of the lattice parameter c by about 0.19%. This observation is used for calculation of the Au diffusion coefficient in Bi-2223. The Au diffusion coefficient decreases as the diffusion-annealing temperature decreases. The temperature dependence of the Au diffusion coefficient in the range 500–800 °C is described by the relation D = 4.4 × 10−4exp(−1.08 eV/kBT). Au doping of the sample increased the critical transition temperature and the critical current density from 100 ± 0.2 to 104 ± 0.2 K and from 40 to 125 A cm−2, in comparison with those of undoped samples. The critical transition temperature and critical current density of Au-doped samples increased with increasing diffusion-annealing time from 10 to 50 h. Au doping of the sample also improved the surface morphology and increased the high-Tc phase ratio. The possible reasons for the observed improvement in superconducting properties of the samples due to Au diffusion are discussed.

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Calculation of the diffusion coefficient of Au in Bi-2223 superconductors

Öztürk¹,

Küçükömeroğlu²,

Terzioğlu³

2007

J. Phys.: Condens. Matter

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“…[3][4][5][6][7][8][9] It has been found that the Pb doping at Bi site in Bi-2212 increases the c-axis conductivity by more than one order of magnitude and reduces the anisotropy. The main advantages of Bi-based systems are their layered structure and hence texturing can be easily induced in it.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of critical current density and flux pinning properties of Gd-doped (Bi, Pb)-2212 superconductor

Vinu

Sarun

Shabna

et al. 2008

Journal of Applied Physics

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The enhanced critical current density (JC) and flux pinning properties of Bi1.7Pb0.4Sr2-xGdxCa1.1Cu2.1O8+δ (where x=0.0, 0.1, 0.2, and 0.3) system prepared by solid-state synthesis in bulk polycrystalline form were studied. Phase analysis, microstructural investigation, and superconducting characterization were performed to evaluate the relative performance of the samples. The x-ray diffraction and energy dispersive spectroscopy analyses show that Gd atoms are successfully doped in place of Sr in the system. It is found that Gd in (Bi, Pb)-2212 enhances the critical temperature (TC), JC, and flux pinning strength of the system. The flux pinning force (FP) calculated from the field dependant JC values shows that the irreversibility line of the Gd-doped (Bi, Pb)-2212 shift toward higher fields to different extents depending on the value of x. The samples with x=0.2 show maximum FP of 645 kN m−3 and the peak position of FP shifts to higher fields (0.68 T) as against 26 kN m−3 and 0.12 T for the pure sample. Also, the values of self-field JC and pinning potential (U0) are maximum for this sample (x=0.2). The enhancements of TC, self-field JC, JC(B) characteristics, U0, and FP are explained on the basis of the hole optimization and formation of point defects due to the doping of Gd in (Bi, Pb)-2212 system.

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“…However, it is not clear if this compound acts as a dispersant or as a solvent. 12,13 The suspension stability depends not only on the dispersant but also on the solvent. Ethanol is the most common solvent chosen for different ceramic suspensions because it does not adversely affect the powder, dissolves most of the organic additives and has a very good balance considering different properties as drying rate, cost, dielectric constant or surface tension.…”

Section: Introductionmentioning

confidence: 99%