Role of annealing time and temperature on structural and superconducting properties of (Bi, Pb)-2223 thin films produced by sputtering

Yıldırım, G.; Varılcı, A.; Akdoğan, Mustafa; Terzioğlu, C.

doi:10.1007/s10854-011-0522-7

Cited by 26 publications

(3 citation statements)

References 49 publications

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“…In a recent study [38], the role of annealing time and temperature on structural and superconducting properties of (Bi, Pb)-2223 thin films produced by sputtering was investigated and it was found the greatest Bi-2223 phase fraction belongs to the film annealed at 860°C for 3 h. In the present work, we state the effect of the various annealing temperature and time on the microstructure and transport properties of the thin films produced by magnetron reactive sputtering method by means of X-Ray analysis (XRD), scanning electron microscopy (SEM), electron dispersive X-Ray (EDX), resistivity and critical current density (J c ) measurements. The results show that the superconducting thin film annealed at 840°C for 6 h obtains the highest T offset c and J c value among the films prepared.…”

Section: Introductionmentioning

confidence: 93%

Effect of Annealing Time and Temperature on Microstructural and Superconducting Properties of (Bi,Pb)-2212 Thin Films Produced by Magnetron Reactive Sputtering

Bal

Varılcı

2012

J Supercond Nov Magn

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This study deals with the role of various annealing time (1 h, 2 h, 4 h, 6 h and 8 h) and temperature (840 and 850°C) on the microstructural and superconducting properties of thin films with the aid of scanning electron microscopy (SEM), X-Ray analysis (XRD), electron dispersive X-Ray (EDX), resistivity and transport critical current density (J c ) measurements. The T c , J c , variation of transition temperatures, hole-carrier concentration, grain size, phase purity, lattice parameter, surface morphology, element distribution, crystallinity and resistivity (at room temperature) values of the films prepared are compared with each other. Critical transition temperatures (T c ) of the samples are deduced from the dc resistivity measurement while critical current density values are estimated from the critical current and total cross-sectional area values. It is found that maximum T c of 79.7 K and J c of 1520 A/cm 2 are observed for the film annealed at 840°C for 6 h as against 54.9 K and 30 A/cm 2 (minimum values), respectively, for the film annealed at 840°C for 4 h. Moreover, SEM images indicate that the former has the best crystallinity, grain connectivity and largest grain size. Based on these results, T c and J c values of the samples studied are found to depend strongly on the microstructure. Additionally, EDX results show that the elements used for the preparation of all the samples are observed to distribute homogeneously. As for the XRD results, all the samples exhibit the polycrystalline superconducting phase with the changing intensity This study is devoted to Gulnur Ozdemir on the occasion of her 26th Birthday. of diffraction lines. According to the refinement of cell parameters done by considering the structural modulation, the largest lattice parameter a and c are obtained for the film annealed at 840°C for 8 h. To sum up, the aim of the present study is not only to investigate the changes of microstructural and superconducting properties of the samples fabricated in the varied time and temperature but to determine the best ambient for the film fabrication and show the feasibility of obtaining Bi-2212 film with tailored structure, as well.

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Section: Introductionmentioning

confidence: 93%

Effect of Annealing Time and Temperature on Microstructural and Superconducting Properties of (Bi,Pb)-2212 Thin Films Produced by Magnetron Reactive Sputtering

Bal

Varılcı

2012

J Supercond Nov Magn

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“…According to the broadening nature of the XRD peaks of the ceramic, the particle size can be determined from the Scherrer-Warren equation [31][32][33][34].…”

Section: Grain Size Calculationmentioning

confidence: 99%

Investigation of microstructural, Vickers microhardness and superconducting properties of YBa2Cu3−xGdxO7−δ (0 ≤ x ≤ 0.150) superconducting ceramics via experimental and theoretical approaches

Doğruer

Öztürk

Varılcı

et al. 2012

J Mater Sci: Mater Electron

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This study manifests the change of pinning mechanism, electrical, structural, physical, mechanical and superconducting properties of YBa 2 Cu 3-x Gd x O 7-d superconductors samples prepared by the conventional solidstate reaction method (x = 0, 0.025, 0.050, 0.100 and 0.150) by use of dc resistivity, X-ray analysis (XRD), scanning electron microscopy (SEM) and Vickers microhardness measurements. Zero resistivity transition temperatures (T c offset ) of the samples are deduced from the dc resistivity measurements. Additionally, the lattice parameters are determined from XRD measurements when the microstructure, surface morphology and microhardness of the samples studied are examined by SEM and mechanical measurements, respectively. The results obtained demonstrate that T c offset values of the samples decrease slowly with the increase in the Gd content. The maximum T c offset (92.0 K) is obtained for the pure sample prepared at 940°C for 20 h in air atmosphere while the minimum value of 83.3 K is found for the sample doped with 0.150 Gd content. Moreover, it is obtained that J c values reduce from 132 to 34 A/cm 2 with the enhancement of the Gd level in the crystalline structure. Further, the peak intensities belonging to Y123 (major) phase are obtained to decrease whereas the peak intensities of the minor phases such as BaCuO 2 and Y211 are found to enhance systematically with the increment in the Gd content in the system, illustrating that partial substitution of Cu 2? ions by Gd 3? ions are carried out successfully. Moreover, SEM images display that the undoped sample obtains the best crystallinity and connectivity between superconducting grains and largest grain size whereas the worst surface morphology is observed for the maximum doped sample (x = 0.150). At the same time, Vickers microhardness, elastic modulus, load independent hardness, yield strength, fracture toughness and brittleness index values, playing important roles on the mechanical properties, are computed for all the samples. The experimental results of the microhardness measurements are examined using the Meyer's law, PSR (proportional specimen resistance), modified PRS, ElasticPlastic deformation model (EPD) and Hays-Kendall (HK) approach. The microhardness values obtained increase with the enhancement of the Gd content in the samples. Besides, it is noted that the Hays-Kendall approach is the most successful model explaining the mechanical properties of the samples studied in this work.

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“…In addition, the Bi-2223 lead with a high phase-forming temperature and a low melting point is often added to form some liquid phases so as to lower the reaction temperature and promote the reaction [26][27][28]. Yildirim et al fabricated a (Bi, Pb)-2223 thin film through sputtering and found that the (Bi, Pb)-2223 phase content in the film obtained after 3 h of annealing at 870 • C was up to 88.65% [29]. Qu et al produced a (Bi, Pb)-2223 thin film with a thickness of about 100 nm on a LAO single-crystal substrate.…”

Section: Introductionmentioning

confidence: 99%

Preparation of high purity phase (Bi, Pb)-2223 superconducting films by sol–gel method

Shen,

Lei,

et al. 2024

Supercond. Sci. Technol.

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In this work, a (Bi, Pb)2Sr2Ca2Cu3O10+δ ((Bi, Pb)-2223) solution with good film-forming capability and chemical stability was synthesized through using metal acetates as raw materials, acrylic acid as an additive, and anhydrous methanol as a solvent to adjust the sol formula. Subsequently, (Bi, Pb)-2223 thin films were fabricated on LaAlO3 (LAO) single-crystal substrates via dip-coating technology at different heat treatment temperatures, and the structures and properties of (Bi, Pb)-2223 films were characterized. It was found that when the sol stoichiometric ratio of Bi : Pb : Sr : Ca : Cu was controlled at 1.9 : 0.35 : 2 : 2 : 3 and the gel film was heat-treated at 860℃ and dwelled for 120 minutes in an mixed atmosphere of N2 : O2 = 96 : 4, the prepared thin film with a pure (Bi, Pb)-2223 superconducting phase exhibited excellent biaxial texture, a dense surface structure, and had a Tc of 106 K and a ΔTc of 6 K. The microstructure analysis revealed a layered epitaxial growth of the film along the LAO substrate with a regular arrangement of atoms and a consistent interlayer spacing.

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Role of annealing time and temperature on structural and superconducting properties of (Bi, Pb)-2223 thin films produced by sputtering

Cited by 26 publications

References 49 publications

Effect of Annealing Time and Temperature on Microstructural and Superconducting Properties of (Bi,Pb)-2212 Thin Films Produced by Magnetron Reactive Sputtering

Effect of Annealing Time and Temperature on Microstructural and Superconducting Properties of (Bi,Pb)-2212 Thin Films Produced by Magnetron Reactive Sputtering

Investigation of microstructural, Vickers microhardness and superconducting properties of YBa2Cu3−xGdxO7−δ (0 ≤ x ≤ 0.150) superconducting ceramics via experimental and theoretical approaches

Preparation of high purity phase (Bi, Pb)-2223 superconducting films by sol–gel method

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