The effect of Ag diffusion on properties of BiPbSrCaCuO thin films

Dzhafaröv, T. D.; Varılcı, A.; Sadygov, M.; Altunbaş, M.

doi:10.1016/0921-4534(96)00411-x

Cited by 9 publications

(4 citation statements)

References 19 publications

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“…It can be seen that the rate of formation of the high-T c phase in the initial stages of annealing (<2 h) is higher than in the last stages (>2 h). This is in good agreement with the work of Dzhafarov et al [13] indicating that the rate of crystallization of the film is higher within the first 2 h of annealing. Figure 3 displays the XRD patterns of the films on MgO (Fig.…”

Section: Resultssupporting

confidence: 82%

“…We have previously shown that the annealing of films evaporated on MgO(001) and Ag/MgO substrates at 835 or 845 C, respectively, resulted in the formation of mixed Bi-2223 and Bi-2212 phases with a high degree of preferential orientation with the c-axis perpendicular to the substrates [13]. The addition of silver was found to be greatly beneficial to the formation of the 2223 phase by shortening the formation time, extending the annealing temperature range in which the 2223 phase can form, and improving the stability of the 2223 phase [14].…”

Section: Introductionmentioning

confidence: 99%

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Production of BiPbSrCaCuO Thin Films on MgO and Ag/MgO Substrates by Electron Beam Deposition Techniques

Varılcı

Altunbaş

Görür

et al. 2002

phys. stat. sol. (a)

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Superconducting BiPbSrCaCuO thin films were prepared on MgO(001) and Ag/MgO substrates using an electron beam (e‐beam) evaporation technique. The effects of annealing temperature and Ag diffusion on the crystalline structure and some superconducting properties, respectively, were investigated by X‐ray diffraction, atomic force microscopy, and by measurements of the critical temperature and the critical current density. It was shown that an annealing of both types of films at 845 or 860 °C resulted in the formation of mixed Bi‐2223 and Bi‐2212 phases with a high degree of preferential orientation with the c‐axis perpendicular to the substrates. The slight increase of the critical temperature from 103 K to 105 K, the enhancement of the critical current density from 2 × 103 to 6 × 104 A/cm2, and the improved surface smoothness are due to a possible silver doping from the substrate.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Production of BiPbSrCaCuO Thin Films on MgO and Ag/MgO Substrates by Electron Beam Deposition Techniques

Varılcı

Altunbaş

Görür

et al. 2002

phys. stat. sol. (a)

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“…After polishing a SEM picture and several EDX point measurements at different areas (a-j) were taken. The results are given in This gradient in Ag concentration is attributed to Ag diffusion, which is in accordance with results from the literature [8,9]. Simultaneously with the increase in Ag concentration an increase in (Bi + Pb) concentration with respect to Ca, Sr and Cu is observed.…”

Section: Ag Diffusionsupporting

confidence: 91%

Origin of the nanocrystalline interface in superconducting Bi-2223/Ag composites: a SEM/HREM study

Bruneel

Oku

Penneman

et al. 2004

Supercond. Sci. Technol.

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Superconducting Bi-2223/Ag composites were prepared and the microstructure was thoroughly studied. A 20 nm thick amorphous–nanocrystalline phase was observed at the interface between the superconductor and the Ag. SEM/HREM/EDX observations were used to study this nanolayer and the results point to incongruent melting as the most probable cause of this phenomenon. The change in concentration of the Bi-2223 phase with the addition of Ag is elucidated in terms of the difference between the sintering temperature used and the incongruent melting. It is suggested that the frequently observed penetration of the ceramic phase into the Ag can be explained by the interfacial energy model.

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“…Ag, which is in the same column as Cu in the Periodic Table, can be doped in various methods: by mixing with metallic Ag [3], mixing with Ag 2 O [4] and by diffusion [5][6][7]. Some groups used Ag to fabricate the noble metal as buffer layers and contact material for high-T c thin films [3,8]. Several studies showed that Ag addition changes the formation temperature of the superconductor, increases the density, improves the microstructure and mechanical properties, changes critical temperature and critical current density, and influences crystallization at the grain boundaries [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of some physical properties of silver diffusion-doped YBa₂Cu₃O_7−xsuperconductors

Görür

Terzioğlu

Varılcı

et al. 2005

Supercond. Sci. Technol.

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Silver diffusion in superconducting YBa2Cu3O7−x (YBCO) has been studied over the temperature range 500–800 °C by x-ray diffraction measurements. The diffusion coefficient of Ag in YBCO was determined from the observed increase (0.12%) in the lattice parameter c as compared with the undoped sample. It was shown that the diffusion coefficient of Ag in the temperature range 500–800 °C changed from 1 × 10−10 to 5 × 10−9 cm2 s−1 with an activation energy of about 1.06 eV. For the Ag-doped sample, the critical transition temperature and the critical current density were increased from 90 to 92.5 K and from 60 to 98 A cm−2 respectively in comparison with those of undoped YBCO. The possible reasons for the observed increases in Tc and Jc due to Ag diffusion were discussed.

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The effect of Ag diffusion on properties of BiPbSrCaCuO thin films

Cited by 9 publications

References 19 publications

Production of BiPbSrCaCuO Thin Films on MgO and Ag/MgO Substrates by Electron Beam Deposition Techniques

Production of BiPbSrCaCuO Thin Films on MgO and Ag/MgO Substrates by Electron Beam Deposition Techniques

Origin of the nanocrystalline interface in superconducting Bi-2223/Ag composites: a SEM/HREM study

Investigation of some physical properties of silver diffusion-doped YBa₂Cu₃O_7−xsuperconductors

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The effect of Ag diffusion on properties of BiPbSrCaCuO thin films

Cited by 9 publications

References 19 publications

Production of BiPbSrCaCuO Thin Films on MgO and Ag/MgO Substrates by Electron Beam Deposition Techniques

Production of BiPbSrCaCuO Thin Films on MgO and Ag/MgO Substrates by Electron Beam Deposition Techniques

Origin of the nanocrystalline interface in superconducting Bi-2223/Ag composites: a SEM/HREM study

Investigation of some physical properties of silver diffusion-doped YBa2Cu3O7−xsuperconductors

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Investigation of some physical properties of silver diffusion-doped YBa₂Cu₃O_7−xsuperconductors