Decrement in metastability with Zr nanoparticles inserted in Bi-2223 superconducting system and working principle of hybridization mechanism

Sarıtekin, N. K.; Pakdil, Murat; Öz, Muhammed; Turgay, T.

doi:10.1007/s10854-015-3839-9

Cited by 19 publications

(6 citation statements)

References 51 publications

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“…Furthermore, the other well-known diffraction peaks of 008 and 0012 for the Bi-2223 (0012 for the Bi-2212) improve (worsen) steadily with the increment of the milling duration time up to 3 h beyond which the peaks degrade (upgrade) significantly as a consequence of the deterioration in crystal plane alignments and the crystallinity in the Bi-2223 structure. The volume fraction values of the lowtemperature (2212) and high-temperature (2223) phases were calculated using the following correlations [7,8]. and In the equations, I H shows the intensities of the hightemperature phase peaks and I L shows the intensity of the low-temperature phase peaks here, and the calculated results are given in Table 1.…”

Section: Xrd Measurement Evidencesmentioning

confidence: 99%

Improving Superconductivity, Microstructure, and Mechanical Properties by Substituting Different Ionic Pb Elements to Bi and Ca Elements in Bi-2223 Superconductors

Sarıtekin

Uzumcu

2022

J Supercond Nov Magn

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In this detailed study, the changes of microstructural, mechanical, and superconducting features of bulk Bi1.8Pb0.2Sr2.0Ca1.8Pb0.2Cu3Oy materials prepared at different milling time intervals (0.5 h ≤ x ≤ 8 h) were investigated in the most precise manner. The measurements of X-ray powder diffraction (XRD) and Vickers microhardness (Hv) were designed to scrutinize the bulk BSCCO samples. All the results of the measurements and calculations show that the characteristics responsible for the applications of the technology, industry, and engineering are significantly improved up to the 3 h milling time beyond that they tend to deteriorate. The enhancement of the characters is generally related to the transition from underdoped level of the (Bi, Pb)-2223 to the optimum level with the milling duration and this event approves that sufficient Pb nanoparticles penetrate the crystal structure. On the other hand, some of the reasons for the suppression in the superconducting properties are the presence of the porosity, disorder, defects, and the localization problem in the Cu-O2 consecutively stacked layers. In addition to those mentioned above, the other reasons are degradation in the crystallinity, reduction in the average crystallite size, and decrease in mobile hole concentration in the Cu-O2 layers. Similarly, the Pb inclusion rises the artificial random dislocations and grain boundary weak-links in the (Bi, Pb)-2223 superconducting system. Vickers microhardness measurements show that (Bi, Pb)-2223 bulk superconducting specimens exhibit typical indentation size behavior depending on the presence of both elastic and plastic deformations in the system. The results obtained from the hardness measurements have been analyzed by using Meyer law, PRS model, MPRS model, elastic–plastic deformation model, and Hays-Kendall approach. As a result, the Hays-Kendall approach was identified as the most successful model in describing the mechanical properties of the samples.

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Section: Xrd Measurement Evidencesmentioning

confidence: 99%

Improving Superconductivity, Microstructure, and Mechanical Properties by Substituting Different Ionic Pb Elements to Bi and Ca Elements in Bi-2223 Superconductors

Sarıtekin

Uzumcu

2022

J Supercond Nov Magn

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“…The qualitative improvement in the grain connectivity was supported by the residual resistance ratio (RRR) defined as R(300 K)/R(120 K) [18]. The RRR values of the BPSCCO samples are also presented in Table 2.…”

Section: Resultsmentioning

confidence: 96%

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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“…A sensitive methodology to analyze the relation between the transition temperatures and the structural disorders was examining the variation of T c,0 as a function of the residual resistance ratio (RRR) parameter. The RRR defined by R(300K)/R(120 K) has been applied as a measure of sample quality [10]. The results are presented in Figure 7.…”

Section: Resultsmentioning

confidence: 99%

A CLOSE CORRELATION BETWEEN DISORDERS-DEFECTS AND SUPERCONDUCTING TRANSITION TEMPERATURE OF Bi1.6Pb0.4Sr2Ca2-xNaxCu3O10+δ SUPERCONDUCTORS

Duc¹

2018

JST

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The enhancements of zero superconducting transition temperature (T c,0 ) in Bi 1.6 Pb 0.4 Sr 2 Ca 2-x Na x Cu 3 O 10+δ (BPSCCO) are reported. The BPSCCO samples (with x ranging from 0.00 to 0.06) were prepared by using the conventional solid state reaction technique. The properties of the samples were examined by using the X-ray diffraction (XRD), scanning electron microscopy (SEM), and the resistance versus temperature (R-T) measurements. From the XRD resuts, all samples revealed the orthorhombic structure, and the volume fraction of the Bi-2223 phase was varied as increasing x, and reached the maximum value of 82.72 % for x = 0.05 sample. Improvements of connectivity between the Bi-2223 grains in the Na-substituted BPSCCO samples were obtained by using the surface SEM images and a quantitive analysis of a correlation between T c,0 and residual resistance ratio (RRR). A similar variation of T c,0 of the samples as increasing x was observed. The highest T c,0 enhancement of 107.5 K was obtained for x = 0.05 sample. Variations of the hole carrier concentrations in the CuO 2 layers were investigated, which also showed the highest value achieved for x = 0.05 sample.

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Decrement in metastability with Zr nanoparticles inserted in Bi-2223 superconducting system and working principle of hybridization mechanism

Cited by 19 publications

References 51 publications

Improving Superconductivity, Microstructure, and Mechanical Properties by Substituting Different Ionic Pb Elements to Bi and Ca Elements in Bi-2223 Superconductors

Improving Superconductivity, Microstructure, and Mechanical Properties by Substituting Different Ionic Pb Elements to Bi and Ca Elements in Bi-2223 Superconductors

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

A CLOSE CORRELATION BETWEEN DISORDERS-DEFECTS AND SUPERCONDUCTING TRANSITION TEMPERATURE OF Bi1.6Pb0.4Sr2Ca2-xNaxCu3O10+δ SUPERCONDUCTORS

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