Glass–ceramic route of BSCCO superconductors – Fabrication of amorphous precursor

Nilsson, Andréas; Gruner, W.; Acker, Jörg; Wetzig, K.

doi:10.1016/j.physc.2007.04.011

Cited by 1 publication

(3 citation statements)

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“…Results of the study on the elemental composition of the precursor plates shows that there are no significant changes in the content of Bi, Pb, Sr and Cu cations. As for Ca, its content turned out to be less relative to the stoichiometric composition, which is consistent with the data [16,17]. According to the results of the study, a significant change is also observed in the oxygen content.…”

Section: Resultssupporting

confidence: 89%

“…At the same time, there are some difficulties associated with obtaining a phase with a high T c (2223) due to a violation of the stoichiometry of the composition (especially for oxygen). In [15,16], a mixture of Bi 2 Sr 2 Ca 2 Cu 3−x Er x O 10+δ (x = 0.5 and 1.0) was melted in an alumina crucible at 1050 • C and 1250 • C for 30 min to 3 h and the melt was poured onto a cold copper plate and quickly pressed with another cold plate to obtain a glass phase. To obtain the HTSC phases, the samples were annealed for 240 h in oxygen, which is associated with oxygen deficiency.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain the HTSC phases, the samples were annealed for 240 h in oxygen, which is associated with oxygen deficiency. In [16,17], a mixture of Bi 2 Sr 2 CaCu 2 O x and Bi 2 Sr 2 Ca 2 Cu 3 O x was melted in a platinum crucible at a temperature from 1000 • C to 1300 • C, while a significant violation of stoichiometry in terms of oxygen content, as well as calcium (9.7% and 25%, respectively) was found. According to Wong-Ng et al [17,18] to increase the content of the phase with high T c (2223), excessive amounts of calcium and copper are necessary.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Research of Critical Parameters of Bi-HTSC Ceramics Based on Glass Phase Obtained by IR Heating

Uskenbaev,

Nogai,

Uskenbayev

et al. 2023

ChemEngineering

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In this paper influence of the excess Ca and Cu cations on the critical temperature (Tc) and critical transport current density (Jc) of high-temperature superconducting ceramics of the compositions (HTSC) Bi1.6Pb0.4Sr2Ca2.1Cu3.1Oy, Bi1.6Pb0.4Sr2Ca2.25Cu3.25Oy and Bi1.6Pb0.4Sr2Ca3Cu4Oy synthesized by the glass-ceramic method has been studied. The synthesis of superconducting ceramics was carried out on the basis of the glass phase, obtained by ultra-fast quenching of the melt. Melting of the mixture of starting components was carried out without the use of a crucible under the influence of IR radiant heating. Analysis of the elemental composition of the samples of the initial precursors showed a significant deviation from stoichiometry in oxygen (increase), as well as a decrease in calcium content. The synthesis of HTSC ceramics was carried out at a temperature of 849–850 °C for 96 h with intermediate grinding every 24 h. Studies of the phase composition of ceramic samples by X-ray diffraction have shown that HTSC ceramics consist only of a superconducting high-temperature phase Bi-2223. Studies of current-carrying characteristics by the four-point probe method according to the criterion of 1 µV/cm2 have shown that high-temperature superconducting ceramics of the compositions Bi1.6Pb0.4Sr2Ca2.1Cu3.1Oy, Bi1.6Pb0.4Sr2Ca2.25Cu3.25Oy and Bi1.6Pb0.4Sr2Ca3Cu4Oy have an increased density of critical transport current of 9.12 A/cm2, 7.62 A/cm2 and 7.26 A/cm2, respectively. At the same time, it was found that with a decrease in the content of Ca and Cu cations in HTSC ceramics, an increase in the critical current density is observed.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%