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

Varılcı, A.; Altunbaş, M.; Görür, O.; Karaca, İbrahim; Çelebi, S.

doi:10.1002/1521-396x(200211)194:1<206::aid-pssa206>3.0.co;2-0

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…In particular, Bi-Sr-Ca-Cu-O (BSCCO) superconductor materials discovered by Maeda et al [5] have widely been investigated owing to the fact that the interest in both the fundamental research and applications in technology and industry of these materials in the last decades stems from their remarkable smaller power losses, high current and magnetic field carrying capacity, optical and electronic properties [6][7][8][9][10][11][12][13][14]. The BSCCO system obtaining a layered structure has three different phases with respect to its chemical compositions, the Bi-2201 phase (n = 1, Tc & 20 K), the Bi-2212 phase (n = 2, Tc & 85 K) and the (Bi, Pb)-2223 phase (n = 3, Tc & 110 K) [15].…”

Section: Introductionmentioning

confidence: 99%

Vickers hardness measurements and some physical properties of Pr2O3 doped Bi-2212 superconductors

Asikuzun

Öztürk

Çetinkara

et al. 2011

J Mater Sci: Mater Electron

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This study deals with the effect of Pr 2 O 3 addition on the structural, superconducting and mechanical properties of Bi-2212 superconductor by means of X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), electron dispersive X-ray (EDX), Vickers microhardness and resistivity measurements. The samples studied are prepared using the standard solid-state reaction method. Onset transition temperatures (T c onset ) of the samples are estimated from the dc resistivity measurements. Furthermore, the phase ratio and lattice parameters a and c are determined from XRD patterns when the microstructure, surface morphology and element composition analyses of the samples are investigated by SEM and EDX measurements, respectively. Additionally, vickers microhardness, elastic modulus, yield strength and fracture toughness values of the samples are deduced from microhardness measurements. It is found that T c onset values of the samples increase from 87 to 97 K with the Pr 2 O 3 addition. According to the refinement of cell parameters done by considering the structural modulation, the doping is confirmed by both an increase of the lattice parameter a and a decrease of the cell parameter c of the samples in comparison with that of the pure sample. As for SEM measurements, it is obtained that the surface morphology and grain connectivity degrade with the increase of the Pr 2 O 3 addition. Moreover, EDX images show that the elements used for the preparation of samples distribute homogeneously and the Pr atoms enter into the crystal structure by replacing Sr atoms. To sum up, the Pr 2 O 3 addition is found to suppress the mechanical, microstructural and superconducting properties of the Bi-2212 superconductor.

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Section: Introductionmentioning

confidence: 99%

Vickers hardness measurements and some physical properties of Pr2O3 doped Bi-2212 superconductors

Asikuzun

Öztürk

Çetinkara

et al. 2011

J Mater Sci: Mater Electron

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“…Researches on Bi-based superconductors Bi 2 Sr 2 Ca n − 1 Cu n O x (n = 1, 2, 3) discovered by Maeda et al [1] increase [2][3][4][5][6][7] day by day owing to the fact that the interest in both the fundamental research and applications in technology and industry of these materials in the last decades stems from their remarkable smaller power losses, high current and magnetic field carrying capacity, optical and electronic properties [8][9][10][11]. For years, researchers have tried to improve their superconducting properties by using several techniques [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 82%

Investigation of Gd Addition Added on Magnetic and Structural Properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Gd x O y Superconductors by ac Susceptibility

Yıldırım

Zalaoğlu

Akdoğan

et al. 2011

J Supercond Nov Magn

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This study reports the effect of Gd addition on magnetic and structural properties of Bi 1.8 Pb 0.35 Sr 1.9 Ca 2.1 Cu 3 Gd x O y superconductor with x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5 by means of ac susceptibility measurements at various ac fields (ranging from 270 to 1352 A/m) and scanning electron microscopy (SEM) images. Critical onset (T on c ) and loss peak temperatures (T p ) were qualitatively estimated from the ac susceptibility curves. The peak temperature at zero acmagnetic field (T p0 ) and intergrain critical current densities (J c ) were theoretically calculated from the ac susceptibility plots via the critical state models. The results show that peak temperatures and critical current densities were found to decrease with increasing Gd addition. Moreover, using a self-field approximation together with J c dependence on temperature, the characteristic length (L c ) associated with the pinning force is estimated to be approximately the same as the average grain size (R g ) of the pinning center because of the linear decrease in J c with increasing temperature. Surface morphology and grain connectivity of the samples were also obtained to degrade with increase in the Gd addition from SEM investigations.

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“…Therefore, the researchers have attempted to improve the superconducting, mechanical, structural and flux pinning properties of the superconductors to make them suitable for high temperature and magnetic field applications [1][2][3][4]. The Bi-Sr-Ca-Cu-O (BSSCO) materials, one of the cuprate high-temperature superconductor families, have widely been investigated because of their higher critical temperature, remarkable smaller power losses, higher current and magnetic field carrying capacity, optical and electronic properties [5][6][7][8][9][10][11][12][13]. Moreover, in the literature there have been several reports relating to BSCCO films for high frequency applications including filters, antennas and magnetic shield devices [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Field Direction on Magnetoresistivity, Activation Energy, Irreversibility and Upper Critical Field of Bi-2212 Thin Film Fabricated by DC Sputtering Method

Bal

Varılcı

2012

J Supercond Nov Magn

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This study aims to investigate the effect of magnetic field direction on superconducting properties of Bi-2212 thin film fabricated on MgO (100) substrate using the direct current (DC) magnetron reactive sputtering technique at 100 watt with the aid of magnetoresistivity measurements. The zero resistivity transition temperatures (T c ), irreversibility fields (μ 0 H irr ) and upper critical fields (μ 0 H c2 ) are deduced from the magnetoresistivity versus temperature curves under DC magnetic fields (parallel and perpendicular to c-axis) up to 5 T. Moreover, thermally activated flux flow (TAFF) model is studied for activation energy (U 0 ) values of the sample. It is found that the T c value decreases from 76.4 K to 39.1 K for the applied magnetic field perpendicular to c-axis (μ 0 H ⊥c-axis); likewise, the T c reduces towards 28.8 K with the increase in the applied field parallel to c-axis (μ 0 H c-axis). Furthermore, the U 0 values are found to decrease considerably with increasing applied magnetic field. In fact, the U 0 of 134.5 K is obtained to be smallest at 5 T field parallel to the c-axis. Additionally, both the μ 0 H irr and μ 0 H c2 values determined are also observed to reduce with the increase of the applied magnetic field. At absolute zero temperature (T = 0 K), the extrapolation of the μ 0 H irr (T ) and μ 0 H c2 (T ) curves is used to obtain the μ 0 H irr (0) and μ 0 H c2 (0) values of the film, respectively. The inner is found to be about 22.216 T (19.046 T) for the applied field perpendicular (parallel) to c-axis whereas the latter is determined to be about 54.095 T (126.522 T) for the applied field parallel (perpendicular) to c-axis, respectively, as a result of anisotropic behavior of the film prepared. On the other hand, penetration depths (λ) and coherence lengths (ξ ) inferred from μ 0 H irr (0) and μ 0 H c2 (0) values are obtained to be about 38.519 Å (41.601 Å) and 16.147 Å (24.685 Å) in the case of applied field perpendicular (parallel) to c-axis, respectively. Based on all the results, the change of the superconducting properties as a function of the magnetic field direction presents the anisotropy of the sample produced. X-ray diffraction (XRD) and scanning electron microscopy (SEM) examinations are also conducted for microstructural and phase analyses of the film.

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

Cited by 8 publications

References 24 publications

Vickers hardness measurements and some physical properties of Pr2O3 doped Bi-2212 superconductors

Vickers hardness measurements and some physical properties of Pr2O3 doped Bi-2212 superconductors

Investigation of Gd Addition Added on Magnetic and Structural Properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Gd x O y Superconductors by ac Susceptibility

Effect of Magnetic Field Direction on Magnetoresistivity, Activation Energy, Irreversibility and Upper Critical Field of Bi-2212 Thin Film Fabricated by DC Sputtering Method

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