Crystallization and synthesis of HTSC of compositions 2234, 2245 in the Bi-Pb-Sr-Ca-Cu-O system based on amorphous precursors obtained by solar radiation hardening

Gulamova, D. D.; Uskenbaev, D. E.; Chigvinadze, D.G.; Magradze, O. V.

doi:10.3103/s0003701x08010131

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…For instance, results obtained in the synthesis of an optical material under the influence of optical radiation (visible light) demonstrate improvements in the structure and conducting properties of the sample [36]. Specific compositions of bismuth-containing HTSC ceramics, prepared from glass phases synthesized under the influence of optical radiation (visible light), show enhancements in the structure and critical parameters of the samples [37].…”

Section: Introductionmentioning

confidence: 99%

Features of Structures and Ionic Conductivity of Na3Fe2(PO4)3 Polycrystals Obtained by Solid Phase and Melt Methods

Nogai,

Uskenbaev

et al. 2023

Ceramics

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This article investigates the structures and conductive properties of polycrystals of Na3Fe2(PO4)3 obtained by solid-state and melt synthesis methods using concentrated optical radiation. It has been established that in the melt synthesis method, the material is synthesized under significantly non-equilibrium thermodynamic conditions, leading to the creation of deformations in the sample, which contribute to the enhancement of ionic conductivity. Additionally, the synthesis duration is reduced by half. Through a comparative assessment of the structural parameters and conductive properties of these materials, it is demonstrated that polycrystals obtained by the melt method exhibit better texture and higher ionic conductivity. The occurrence of deformations during the synthesis of α-Na3Fe2(PO4)3 under high temperature-gradient conditions indicates the elasticity of the crystalline framework {[Fe2(PO4)]3−}3∞. It is concluded that the non-equilibrium thermodynamic conditions of α-Na3Fe2(PO4)3 synthesis promote the formation of deformations in the crystalline structure of polycrystals, leading to a partial increase in symmetry and ionic conductivity.

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Section: Introductionmentioning

confidence: 99%

Features of Structures and Ionic Conductivity of Na3Fe2(PO4)3 Polycrystals Obtained by Solid Phase and Melt Methods

Nogai,

Uskenbaev

et al. 2023

Ceramics

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“…A method is also used to increase the critical current by creating effective pinning centers to anchor the vortex magnetic flux. A more effective way to increase the density and texture in ceramic superconductors is using glass-ceramic technology, according to which the production of ceramics is associated with the use of precursors from the glass phase [8][9][10][11][12][13][14]. The use of this technology provides advantages such as reducing phase segregation, improving the uniformity of the distribution of components and increasing their mutual solubility, reducing the synthesis time due to the metastable state of the glass phase, flexibility in molding a complex-shaped product, obtaining dense and textured ceramics, which can directly affect the increase in the current-carrying characteristics of superconducting ceramics.…”

Section: Introductionmentioning

confidence: 99%

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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“…In the field of materials science, a separate niche is occupied by materials and products with special electrical properties: ferroelectrics, superionic conductors, semiconductors, and superconductors [1][2][3][4]. tronics, medicine, communications, etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of high-temperature superconducting ceramics in the Bi(Pb)-Sr-Ca-Cu-O system based on amorphous precursors

Uskenbaev

Zhetpisbayev

Beissenov

et al. 2022

EEJET

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The paper presents the results of the synthesis of bismuth superconducting ceramics with compositions Bi1.6Pb0.4Sr2Can-1CunOy (n=2, 3, 5) based on amorphous ceramics obtained by ultrafast melt quenching. In order to increase the rate of formation of superconducting compounds, effective devices have been developed for melting and hardening melts under the action of IR radiation. The sample holder was made of platinum. Melting and hardening were carried out in a continuous mode in an oxidizing environment in a flowing air atmosphere. The study of the elemental composition of the precursor samples established a slight deviation towards a decrease in the cationic composition of the precursors (Bi, Pb and Ca), relative to the stoichiometric composition. An increase in oxygen content by 12–15 % was also found. Synthesis of superconducting compounds was carried out in the temperature range of 843–850 °C, depending on the composition. The study found that in the sample Bi1.6Pb0.4Sr2Ca4Cu5Oy (2245) the superconducting high-temperature phase 2223 crystallizes. It was found that the formation of the superconducting phase 2223 in the Bi1.6Pb0.4Sr2Ca4Cu5Oy composition occurs in a lower and wider temperature range (843–848 °C) compared to the Bi1.6Pb0.4Sr2Ca2Cu3Oy (2223) composition. The complete formation of the superconducting high-temperature phase 2223 in a sample with the nominal composition Bi1.6Pb0.4Sr2Ca2Cu3Oy (2223) was carried out in a narrow temperature range of 849–850 °C, in a strict temperature regime with the participation of the liquid phase. An increase in the rate of formation of the superconducting compound 2223 in both studied compositions by 1.5–2.5 times was established, compared with the solid-phase method and other melt methods

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Crystallization and synthesis of HTSC of compositions 2234, 2245 in the Bi-Pb-Sr-Ca-Cu-O system based on amorphous precursors obtained by solar radiation hardening

Cited by 6 publications

References 5 publications

Features of Structures and Ionic Conductivity of Na3Fe2(PO4)3 Polycrystals Obtained by Solid Phase and Melt Methods

Features of Structures and Ionic Conductivity of Na3Fe2(PO4)3 Polycrystals Obtained by Solid Phase and Melt Methods

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

Synthesis of high-temperature superconducting ceramics in the Bi(Pb)-Sr-Ca-Cu-O system based on amorphous precursors

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