| Yazarlar |
Cabir Terzioğlu
Abant İzzet Baysal Üniversitesi, Türkiye |
Prof. Dr. Özgür ÖZTÜRK
Kastamonu Üniversitesi, Türkiye |
|
İbrahim Belenli
Abant İzzet Baysal Üniversitesi, Türkiye |
| Özet |
| We have investigated the effect of the gold diffusion on the crystal structure and superconducting properties of Bi-2223 superconducting samples employing X-ray diffraction (XRD), scanning electron microscopy (SEM), critical transition temperature, critical current density, and room temperature resistivity measurements. Doping of Bi-2223 was carried out by means of gold diffusion from an evaporated gold film on pellets during sintering. XRD patterns and SEM micrographs are used to obtain information about Bi-2223 phase ratio, lattice parameters and grain size, respectively. Au doping of the samples 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 gold diffusion in Bi1.8Pb0.35Sr1.9Ca2.1Cu 3Oy has been studied over the temperature range of 500-830 °C using the technique of successive removal of thin layers and measurement of the sample's conductivity at room temperature. The temperature dependence of the Au diffusion coefficient in the range of 500-830 °C was described by the relation D = 5 × 10-4 exp (-1.09 eV/kBT). The possible reasons for the observed improvements in microstructure and superconducting properties due to Au diffusion were discussed. © 2008 Elsevier B.V. All rights reserved. |
| Anahtar Kelimeler |
| Activation energy | Au diffusion | Diffusion coefficient | Transition temperature |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale |
| Dergi Adı | JOURNAL OF ALLOYS AND COMPOUNDS |
| Dergi ISSN | 0925-8388 |
| Dergi Tarandığı Indeksler | SCI |
| Makale Dili | İngilizce |
| Basım Tarihi | 03-2009 |
| Cilt No | 471 |
| Sayı | 1 |
| Sayfalar | 142 / 146 |
| Doi Numarası | 10.1016/j.jallcom.2008.03.122 |
| Makale Linki | http://linkinghub.elsevier.com/retrieve/pii/S0925838808005148 |
| Atıf Sayıları | |
| WoS | 15 |
| SCOPUS | 14 |
| Google Scholar | 20 |
| Google Scholar | 20 |
