Effects of Li Substitution in Bi-2223 Superconductors

Bilgili, Özlem; Selamet, Yusuf; Kocabaş, Kemal

doi:10.1007/s10948-008-0374-4

Cited by 96 publications

(45 citation statements)

References 16 publications

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“…Moreover, alkaline metals have a +1 valence state; hence, their substitution is attractive from the point of changing carrier concentration. The effects of substituting alkaline metals for Bi, Sr, and Cu in BSCCO were studied by [39][40][41] and reported that while the Tc was increased by Li and Na doping, it was decreased by K and Rb. It was also found that alkaline metals drastically decreased the formation temperature of the Bi-2212 phase.…”

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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“…A recently synthesized new Y-based HTS, Y 3 Ba 5 Cu 8 O 18 (Y358), exhibited superconductivity above 100 K [11]. In the previous studies of our group, several types of substitution studies were also done to improve the desired high-T c phase [12][13][14][15]. Research on doping or substitution of other elements into cuprate superconductors not only contributes to the find of applications for superconductivity but also helps to determine the pairing mechanism in HTSs.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Sb Substitution on Structural Properties in YBa2Cu3O7 Superconductors

Akyüz

Kocabaş

Yıldız

et al. 2011

J Supercond Nov Magn

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In this study, the effects of partial Sb 3+ ion substitutions for the Y sites and the Cu sites on the superconducting properties of YBa 2 Cu 3 O y (Y123) ceramic superconductors were investigated. The samples were prepared by the conventional solid-state reaction method and the properties of the samples were investigated by means of X-ray diffraction, AC magnetic susceptibility measurements, scanning electron microscope, and energy dispersive X-ray analysis. The critical temperatures were determined to be in the range of 80-92 K for both Systems I and II. It was found that Sb-addition leads to the formation of the non-superconducting YBa 2 SbO 6 phase, which has a negative effect on the critical temperature, since the highest critical temperature was measured for pure Y123. However, the increasing substitution level has a negligible effect on the X-ray diffraction analysis peak intensities of the superconducting phases. In addition, SEM images showed that Sb substitution decreases the grain size and modifies the microstructure development, which makes the samples denser.

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“…The granular morphology for the un-substituted sample x = 0, consists primly of flaky layers of large platelet-like structure with random alignment distribution as shown in Fig. 2(a), which is a signature of (Bi,Pb)-2223 phase formation [48,49]. The platelet grains are well linked as x increases to 0.025, in which the platelet-like grains still have a flaky structure.…”

Section: Characterization and Investigationmentioning

confidence: 98%

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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Effects of Li Substitution in Bi-2223 Superconductors

Cited by 96 publications

References 16 publications

Improvement of superconducting properties in Na-doped BSCCO superconductor

Improvement of superconducting properties in Na-doped BSCCO superconductor

The Effects of Sb Substitution on Structural Properties in YBa2Cu3O7 Superconductors

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

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