Dependence of superconducting properties and microstructure on heat treatment in Ag-sheathed BiPbSrCaCuO tapes

Jeong, Dae-Yong; Sohn, Myung-Hwan; Ha, Dong Woo; Han, In-Soo; Ryu, Keun; Kim, Y.C.; Han, Sehee

doi:10.1016/0921-4534(91)91368-e

Cited by 6 publications

(2 citation statements)

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“…: +90 3747 2541000; fax: +90 374 2534642. if the noble metals (Ag and Au) are added to the system. Silver addition enhances the critical current density (J c ) [12,13] and improves the superconducting transition temperature (T c ) [14,15], mechanical properties and electrical stability [16]. When added to this system, silver reduces the normal-state resistivity and the contact resistance [15,17].…”

Section: Introductionmentioning

confidence: 99%

The effect of Au diffusion on some physical properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy superconductors

Terzioğlu

Öztürk

Belenli

2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

The effect of Au diffusion on some physical properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Oy superconductors

Terzioğlu

Öztürk

Belenli

2009

Journal of Alloys and Compounds

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“…They found that, for an Ag-doped sample, the critical transition temperature and the critical current density were increased while the room-temperature resistivity values were decreased in comparison with those of undoped YBCO. The researchers found that Ag addition in the BSCCO system enhances the critical current density (J c ) [12,13], improves the superconducting transition temperature (T c ) [14,15], mechanical properties and electrical stability [16], and reduces the normal-state resistivity and the contact resistance [15,17]. On the other hand, it was observed that Au addition degraded the superconductivity of Bi(Pb)-Sr-Ca-Cu-O [17].…”

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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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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