Beginning point of metal to insulator transition for Bi-2223 superconducting matrix doped with Eu nanoparticles

Yıldırım, G.

doi:10.1016/j.jallcom.2013.07.016

Cited by 51 publications

(11 citation statements)

References 53 publications

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“…Eventually, 2% Co doping level exterminate the superconductivity in Bi-2212 system resulting in a metal-insulator type transition (MIT) [40,43]. 3 for different Co3O4-content at temperatures of 10, 15 and 20 K, respectively.…”

Section: Resultsmentioning

confidence: 99%

Rapid Suppression of Superconductivity in Co3O4 nanoparticles-added Bi-2212 ceramics

Gürsul

2023

Türk Doğa Ve Fen Dergisi

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Bu çalışma, sırasıyla x = 0, 0.5, 1 ve 2 için %x ağırlıkça Co3O4 nano parçacıklarıyla eklenmiş Bi-2212 seramiğindeki kristal kalitesi, faz bileşimleri, süperiletken özellikler ve çivileme kuvvetindeki dikkate değer değişimlerle ilgilidir. XRD analizi, Co3O4-içeriği XRD piklerinde genişlemeye, kristal kalitesinin düşmesine ve Bi-2212 miktarının azalmasına yol açtığı sonucuna varır. SEM'den Co3O4 ilavesiyle çubuksu yapıdan plakamsı yapıya doğru bir evrilme olduğu görülmektedir. Kritik geçiş sıcaklığı (Tc), M-T ölçümlerinden saf örnekte 82 K olarak bulunmuş ve 0.5% Co örneğinde 65 K’ye 1% Co örneğinde 42 K’ye kademeli olarak düştükten sonra süperiletkenlik 2% Co örneğinde kaybolmuştur. M-H ölçümlerinden, histerezis eğrilerinin Co3O4 eklenmesi ve sıcaklıkla birlikte daraldığı görülmektedir. Buna bağlı olarak, kritik akım yoğunlukları (Jc) ve çivileme kuvvetleri (Fp), Co3O4 içeriğindeki artışın neden olduğu süper iletken tanecikler arasındaki bağlantıdaki bozulmalar nedeniyle azalmıştır.

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Section: Resultsmentioning

confidence: 99%

Rapid Suppression of Superconductivity in Co3O4 nanoparticles-added Bi-2212 ceramics

Gürsul

2023

Türk Doğa Ve Fen Dergisi

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“…The increases in the Bi-2223 phase fraction as both increasing the sintering temperature from 840 to 850 o C and substituting Na to Ca site might suggest that the two experiment techniques enhance the formation of the Bi-2223 phase. The average size of the Bi-2223 grains was deduced from the corresponding peak by using the Scherrer equation [14]: t = 0.9λ/(Δθcosθ B ), where t is the size needed to be calculated,  is the wavelength of the X-ray Cu-K radiation, and Δθ is the full width at half maximum of the Bi-2223 peak at the angle  B (half of the 2 value shown in Figure. 1).…”

Section: Resultsmentioning

confidence: 99%

A comparative study of enhancements of critical temperature in Bi-Pb-Sr-Ca-Cu-O superconductors

Tran

Duong

et al. 2017

MaP

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Abstract:In this work, the effects of sintering temperature and Na subtitution on zero critical temperature (T c,0 ) in Bi-Pb-Sr-Ca-Cu-O superconductors were investigated. The Bi 1.6 Pb 0.4 Sr 2 Ca 2-x Na x Cu 3 O 10+ bulk samples with x = 0.00 and 0.05 (BPSCCO) were prepared by using the solid state reaction technique at elevated sintering temperatures of 840 and 850 o C. To examine the improvements of structural and superconducting properties of the BPSCCO samples, the X-ray diffraction (XRD), scanning electronic microscope (SEM) and DC resistance versus temperature (R-T) measurements were carried out. The experimental findings exhibit a co-existence of the high T c (Bi-2223) and low T c (Bi-2212) phases in all samples. The estimated volume fraction of the Bi-2223 phase was increased from 71.4 to 75.7%, and the average size of the Bi-2223 grains was enlarged from 4.5 to 9.8 m as changing the sample preparation conditions. The improved connectivities between the Bi-2223 grains were also obtained by quantitively analyzing the relation between T c,0 and residual resistance ratio (RRR). These improvements were likely to be reasons for the enhancements of T c,0 in the BPSCCO samples.

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“…Once the omnipresent flaws (stress raisers and crack initiation sites) and surface cracks in the ceramic compounds can be eliminated in the crystal structure belonging to these kinds of materials, the key mechanical design properties such as the mechanical durability, ductility, hardness, stiffness, toughness, fracture and especially flexural strengths can reach their maximum points due to the diversion or deceleration of crack propagation, crack-producing flaws and dislocation movement. The considerable increment in the mechanical performance enables the mechanical engineers and scientists to pay much more attention to a new question about the application fields including the future heavy-industrial technology, electro-optic and innovative energy infrastructure application fields [13][14][15][16][17][18][19]. All in all, the improvement in the mechanical performance of Bi-based superconducting parents is inevitably reality for the appearance of the materials in the future application fields.…”

Section: Introductionmentioning

confidence: 99%

A VALUABLE VIEW ON EVALUATION OF GENERAL MECHANICAL PERFORMANCES PERTAINING TO Bi-2223 SUPERCONDUCTING CERAMICS WITH VANADIUM ADDITION

Soykan

Valiyeva

2020

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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In this research, our scientific group investigates the effect of vanadium addition in the Bi-2223 superconducting matrix on the general mechanical performance features by the help of experimental microhardness measurements conducted by a small indenter between the well-defined stress loads of 0.245 N and 2.940 N. Moreover, we determine the key mechanical design parameters including the elastic moduli with the hardness, stiffness coefficients, fracture toughness, yield strength, brittleness index and its opposite behavior (ductility) in the applied test loads given using the experimental data deduced from the microindentation tests. According to the experimental findings, it is oberved that the presence of vanadium content in the Bi-2223 crystal structure surpasses seriously the general mechanical performance and related parameters due to the degradation in the quality of grain boundary couplings, crystal structure and basic structural quantities as a consequence of the increment in the structural problems, permanent plastic deformations, crack-producing flaws and dislocations. In other words, the augmentation of vanadium compounds in the Bi-2223 superconducting lattice brings about the considerable enlargement in the responsibility to the static indentation loads. Namely, the sensitive level to the applied loads increases rapidly with the vanadium concentration. We also search the variation of graphs between the Vickers hardness parameters and applied test loads. In this respect, all the materials prepared in this work exhibit the standard ISE (indentation size effect) characteristics but within the decrement trend as the vanadium content level increases. In more detail, the impurity atoms damage harshly the ISE feature of Bi-2223 type-II superconducting ceramics. Additionally, we discuss the change of plateau limit regions coincided with the permeant artificial structural problems in the graphics. The vanadium leads to shorten the applied test load values for the plateau limit regions of Bi-2223 materials, stemmed from the enhancement the general structural problems. To conclude, the vanadium inclusions are ploughed to improve the general mechanical performance features and key mechanical design parameters.

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Beginning point of metal to insulator transition for Bi-2223 superconducting matrix doped with Eu nanoparticles

Cited by 51 publications

References 53 publications

Rapid Suppression of Superconductivity in Co3O4 nanoparticles-added Bi-2212 ceramics

Rapid Suppression of Superconductivity in Co3O4 nanoparticles-added Bi-2212 ceramics

A comparative study of enhancements of critical temperature in Bi-Pb-Sr-Ca-Cu-O superconductors

A VALUABLE VIEW ON EVALUATION OF GENERAL MECHANICAL PERFORMANCES PERTAINING TO Bi-2223 SUPERCONDUCTING CERAMICS WITH VANADIUM ADDITION

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