Physical, Mechanical and Magnetic Properties of the Yb-Substituted Bi2Sr2Ca1Cu2O y Textured Superconductor

Gündoğmuş, Hakan; Özçelık, Bekir; Özkurt, Berdan; Sotelo, A.; Madre, M. A.

doi:10.1007/s10948-012-1725-8

Cited by 24 publications

(11 citation statements)

References 12 publications

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“…In previous works, the effects of several substitutions for Ca or Cu have been studied in detail [42][43][44][45]. On the other hand, in the best of our knowledge, no studies about the Na-substitution effect on the Bi-2212 properties have been made.…”

Section: Introductionmentioning

confidence: 99%

Improvement of superconducting properties in Na-doped BSCCO superconductor

Özçelık

Gürsul

Sotelo

et al. 2014

J Mater Sci: Mater Electron

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In this study, the effect of Na substitution on the structural, electrical and magnetic properties of Bi 2 Sr 2 Ca 1-x Na x Cu 2 O 8+y superconductor with x=0.0, 0.05, 0.075, 0.1, 0.15, and 0.2 has been investigated. The effects of partial replacement of Na for Ca have been investigated by electrical resistivity (ρ-T), scanning electron microscopy (SEM), X-ray diffraction (XRD), and magnetic characterizations. XRD results have shown that the Bi-(2212) phase is the major one independently of the Na-concentration. SEM results indicate that the microstructure of samples is improved with increasing of Na-contents. From the electrical resistivity measurements it has been found that Tc is slightly higher than 92 K for Na-concentrations up to 0.20. Moreover, this trend is maintained in the magnetic measurements where the hysteresis loops are increased with increasing Na-concentrations. The maximum calculated Jc, using Bean's model, is around 10*10 6 A/cm 2 at 10 K and ∼ 1000 Oe for the 0.075 Na doped samples.

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Section: Introductionmentioning

confidence: 99%

Improvement of superconducting properties in Na-doped BSCCO superconductor

Özçelık

Gürsul

Sotelo

et al. 2014

J Mater Sci: Mater Electron

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“…On the other hand, there are some  problems which limit the practical applications of (Bi,Pb)-2223; the most limiting parameters for the practical applications of this phase are critical current density J c and mechanical properties [2]. Since the discovery of high temperature superconductors (HTSCs), many substitutions have been carried out in BSCCO system in order to improve its T c and J c , and better understand the structural, physical, and mechanical properties [3][4][5][6][7][8]. The rare-earth element chemical substitution has an effective route in improving the flux pinning centers, which in turn enhance J c and other transport properties of (Bi,Pb)-2223 phase [9].…”

Section: Introductionmentioning

confidence: 99%

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

et al. 2016

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Abstract:The effect of the partial substitution of Ca 2+ by Ho 3+ ions on the electrical and mechanical properties of the superconducting phase (Bi,Pb)-2223 was studied. Superconducting samples of the type (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ were prepared by solid-state reaction technique under ambient pressure, and characterized by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The superconducting transition temperature T c and pseudogap temperature T * were estimated from electrical resistivity measurements, while the critical current density J c was determined from I-V curves. The electrical resistivity data were discussed according to bipolaron model in the absence of thermally excited individual polarons. The sample with x = 0.025 showed the highest phase volume fraction, T c , and J c . Room temperature Vickers microhardness measurements were carried out at different applied loads (0.25-5 N) in order to investigate the performance of the mechanical properties of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ phase. It was found that all the samples exhibit normal indentation size effect (ISE). The Vickers microhardness number H V increased as x increased from 0 to 0.025. The experimental results were discussed in view of Meyer's law, Hays-Kendall (HK) approach, elastic/plastic deformation (EPD) model, and proportional specimen resistance (PSR) model. The load independent (true) microhardness of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2.1−x Ho x Cu 3.1 O 10+δ superconducting samples showed identical behavior to that of the PSR model.

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“…From these micrographs, it is clear that the grey contrast in all samples is the major one which has been associated by EDX to the Bi-2212 phase. Note that the different contrasts found in the micrographs indicate the different phases which can be easily analyzed by EDX analysis [34,35]. However, the amount of dark grey and white contrasts increase with increasing Yb content, implying that the increase in Yb content produces non-superconducting phases in the bulk samples.…”

Section: Resultsmentioning

confidence: 95%

Effect of Yb substitution in Bi-2212 ceramics prepared by laser floating zone technique

Özkurt

Özçelık

Madre

et al. 2015

J Mater Sci: Mater Electron

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In the present work, the influence of Yb substitution for Bi on the structural, electrical and magnetic properties of textured Bi-2212 ceramics has been investigated. X-ray diffraction studies indicated that the major peaks correspond to the Bi-2212 phase. The SEM images clearly show that there is an increase in the number of secondary phases with raising Yb content while all samples maintain similar grain morphology. Magnetic analysis of all samples has been done by magnetic hysteresis measurements, indicating that an enhancement in the M-H loops is obtained by a low Yb doping. The critical current density of samples was calculated from the M-H curves by using Bean's critical state model, indicating that sample with 0.05 Yb substitution possesses the highest J c values.

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Physical, Mechanical and Magnetic Properties of the Yb-Substituted Bi2Sr2Ca1Cu2O y Textured Superconductor

Cited by 24 publications

References 12 publications

Improvement of superconducting properties in Na-doped BSCCO superconductor

Improvement of superconducting properties in Na-doped BSCCO superconductor

Electrical and mechanical properties of (Bi,Pb)-2223 substituted by holmium

Effect of Yb substitution in Bi-2212 ceramics prepared by laser floating zone technique

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