The Role of Chemical Substitutions on Bi-2212 Superconductors

Cabassi, R.; Delmonte, Davide; Abbas, M M; Abdulridha, Ali Razzak; Gilioli, E.

doi:10.3390/cryst10060462

Cited by 14 publications

(5 citation statements)

References 14 publications

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“…This improvement can be attributed to the reduction in porosity or resistance to crack propagation among the grains as well as the enhancement of grain connectivity by adding nanoparticles up to 0.05 wt% into the (Bi, Pb)-2212 phase. While, H V reduction for x = 0.10 wt% could be due to a variety of factors including increased grain boundary weak links, specimen cracking/porosity, disorder, and irregular grain orientation distribution [47]. These results are consistent with the results observed from SEM micrographs and the porosity calculations.…”

Section: -5 Vickers Microhardness Measurementssupporting

confidence: 88%

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Thermal and Mechanical Investigations of (Bi, Pb)-2212 Superconductor Added with Different Oxide Nanoparticles

Matar,

Basma,

Abbas

et al. 2024

Materials Performance and Characterization

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In this study, superconducting samples of type Bi 1.6 Pb 0.4 Sr 1.9 Ca 1.1 Cu 2.1 O y ,(Bi, Pb))-2212, added with CdO, CdMnO, and CdFeO nanoparticles, were synthesized using a solid state reaction technique. The samples were examined using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). Thermogravimetric analysis (TGA) was utilized to evaluate the thermal stability of the pure sample throughout the different stages of the phase formation and the effect of the nanoparticles addition. The weight loss/gain by the three additions is related to the excess of oxygen, con rmed via Iodometric titration analysis and from the ndings of oxygen diffusion energy using TGA data. Vickers microhardness measurements were conducted at various applied loads (0.49-9.8 N). All of the prepared samples displayed a typical 'indentation size effect' (ISE) behavior based on the H V measurements. It was found that the optimum addition of nanoparticles, for increasing the microhardness of the (Bi, Pb)-2212 phase, was at x = 0.05 wt. %. Furthermore, various mechanical properties as Elastic modulus (E), yield strength (Y), fracture toughness(K), and brittleness index (B) were calculated for three additions of the samples studied. As for the theoretical examination of H V in the saturation limit regions, the indentationinduced cracking (IIC) model wins the comparison.

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Section: -5 Vickers Microhardness Measurementssupporting

confidence: 88%

“…The diffraction peaks with 2θ between 20° and 60° for all three nano additions are well indexed with the tetragonal structure of Bi-2212 space P4/mmm using the JCPDS card No. 00-082-2278[47]. All XRD spectra demonstrate a single phased Bi-2212 without the detection of impurities.…”

mentioning

confidence: 90%

Thermal and Mechanical Investigations of (Bi, Pb)-2212 Superconductor Added with Different Oxide Nanoparticles

Matar,

Basma,

Abbas

et al. 2024

Materials Performance and Characterization

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“…When looking at the SEM of the Li-0 sample, randomly oriented platelet-shaped grains and interspersed micro-voids stand out. This morphological structure is considered a typical feature of the Bi-2212 system prepared by the solid state method [15]. On the other hand, what we can consider as an interesting result is the emergence of rectangular prism-shaped grain structures as the Licontent increases.…”

Section: Resultsmentioning

confidence: 63%

Enhancement in the critical current density of Bi-2212 superconductor via Li substitution

2023

Proceeding Book of 3rd International Conference on Scientific and Academic Research ICSAR 2023

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This study is about examining the effect of lithium substitution for the copper site of the Bi-2212 superconductor on microstructural, magnetic hysteresis and critical current densities. Superconducting samples given with the nominal formula Bi2Sr2CaCu2-xLixO8+δ where x= 0, 0.05, 0.10, 0.15, and 0.20 were produced by the classical solid state reaction method due to reasons such as ease, repeatability and low cost. To determine the microstructural properties of the samples, SEM photographs at 10 kX were taken and with the increase in Li-content, an evolution from randomly platelet-shaped grains to rectangular prism-shaped grains was observed. Critical transition temperature (Tc) values of the samples increased with Li-level in Bi-2212 observed from M-T measurements. Additionally, it is revealed from M-H measurements that the area of the hysteresis curves expanded with the increase of Li-content . Accordingly, values of remanent magnetization (Mr) and critical current density (Jc) of Bi-2212 samples were found to be increase with Li-substitution for Cu-site.

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“…The plots of figure 1 show the room temperature XRD patterns of Cd-0, Cd-1, Cd-2, Cd-4, and Cd-5 after the last stage of heat treatment. The diffraction peaks with 2θ between 20°and 60°are well indexed with the orthorhombic structure of Bi-2212 space using the ICDD entry N.00-082-2278 [21]. All XRD spectra show a single phase of Bi-2212 with no traces of impurities within the detection limit of the measurement instruments.…”

Section: X-ray Powder Diffraction (Xrd)mentioning

confidence: 91%

Investigation of the structural and electrical properties of CdO/(Bi, Pb)−2212 superconducting phase

et al. 2022

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This investigation reports the effect of the addition of CdO nanoparticles on the (Bi,Pb)-2212 superconducting phase. The superconducting samples of general formula (CdO)x Bi1.6 Pb0.4 Sr1.9 Ca1.1Cu2.1 O8 (x = 0.00, 0.01, 0.02, 0.05, and 0.1 wt%) are synthesized using the conventional solid-state reaction technique. Powder X ray diffraction analysis confirms the formation of a single-phase orthorhombic Bi-2212. The variations in the lattice parameters are explained based on the Jahn Teller distortion induced by the increase in the oxygen content owing to the addition of the CdO nanoparticles. The increase in the oxygen content is confirmed via Idiometric titration analysis. The grain morphology is investigated using scanning electron microscopy (SEM). The effect of CdO addition in enhancing grains connectivity by the filing of pores and voids is revealed. Fourier transform infrared (FTIR) spectroscopy is conducted to analyze the functional groups, based on the effect of calcination temperature and CdO addition. Dc-electrical resistivity measurements and I-V characteristics show an enhancement of the superconducting transition temperature (Tc) and the critical current density (Jc) with CdO addition up to x=0.05 wt%, followed by a further decrease. By analyzing the results of the X-ray photoelectron spectroscopy (XPS), the variations of the superconducting properties are explained based on the preferred substitution of Pb2+ ions in the Bi3+ or Cu2+ sites induced by the variations in the oxygen content generated by the addition of CdO nanoparticles.

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The Role of Chemical Substitutions on Bi-2212 Superconductors

Cited by 14 publications

References 14 publications

Thermal and Mechanical Investigations of (Bi, Pb)-2212 Superconductor Added with Different Oxide Nanoparticles

Thermal and Mechanical Investigations of (Bi, Pb)-2212 Superconductor Added with Different Oxide Nanoparticles

Enhancement in the critical current density of Bi-2212 superconductor via Li substitution

Investigation of the structural and electrical properties of CdO/(Bi, Pb)−2212 superconducting phase

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