Synthesis and investigation of (Hg1−xCux)Ba2Ca2Cu3O8+δ

Lokshin, Konstantin A.; Pavlov, D. A.; Kovba, M. L.; Putilin, S.N.; Антипов, Е.В.; Bryntse, I.

doi:10.1016/s0921-4534(01)00909-1

Cited by 5 publications

(6 citation statements)

References 23 publications

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“…A different synthesis technique of Hg-1223 has been developed in [32,33]. The authors used a two-temperature technique by annealing the reaction mixture at 900 • C and a CoO/Co 3 O 4 mixture as an oxygen getter to achieve a controlled partial pressure of oxygen (about 2.2 bar).…”

Section: Synthesis Ofmentioning

confidence: 99%

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Chemistry and structure of Hg-based superconducting Cu mixed oxides

Антипов

Abakumov

Putilin

2002

Supercond. Sci. Technol.

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The most relevant aspects of thermodynamics, preparation, crystal structure and superconducting properties under ambient and high pressure of HgBa2Can−1CunO2n+2+δ superconductors are reviewed in this contribution. The ideas which inspired authors to search for the new superconductors among Hg-based complex cuprates are discussed as an example illustrating the benefit of the concept of intergrowth structure formation for the design of new layered materials. Recent results on solid–gas equilibriums useful for reproducible syntheses of different homologues are summarized. The crystal structures are discussed with main attention focused on features such as concentration and location of extra oxygen atoms, static atomic displacements due to partial occupation of oxygen site in a Hg-layer, substitution in a Hg position and a presence of stacking faults. It is shown that these factors have to be taken into account for a correct structure description. The relationships between Tc, doping level, amount and formal charge of extra anions and external pressure are outlined to predict possible paths for enhancement of the superconducting properties in complex cuprates.

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Section: Synthesis Ofmentioning

confidence: 99%

“…This in turn favours the formation of more substituted Hg-1223 phases with increasing temperature. One can suggest that synthesis of stoichiometric Hg-1223 samples at 900 • C requires higher partial pressures of mercury, which is quite difficult to achieve in the common encapsulation method [32].…”

Section: Synthesis Ofmentioning

confidence: 99%

Chemistry and structure of Hg-based superconducting Cu mixed oxides

Антипов

Abakumov

Putilin

2002

Supercond. Sci. Technol.

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“…The common thing was the appearance of Cu-1223 phase like Hg-1223 with some variation in the lattice constant. This result might be a positive effect on the resistivity measurement in order to determine the superconducting phase as mentioned before [11]. The small difference in the crystal structure related to the appearance of low phase Cu-1212, which formed by the ratio 26% of the whole structure.…”

Section: Resultsmentioning

confidence: 76%

“…The normal solid-state reaction was not used in preparation of Hg-family superconductor because of high evaporation of Hg-element in the mixture; to avoid this problem, the technique of a sealed quartz tube applied thermally in solid-state reaction [11]. The solving of this problem was the replacing of a metal ion instead of Hg-ion such as Cu-ion, and producing a new family like Hg-1223 family [12] [13].…”

Section: Introductionmentioning

confidence: 99%

The Correlation of Miller Indices with the Conductivity Mechanism of Cu-Based High-Tc Superconductor

Maher¹,

Al‐Shakarchi²

2017

JMP

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The high temperature superconductor of CuBa 2 Ca 2 Cu 3 O 8+δ (Cu-1223) was synthesized experimentally by solid-state reaction. There were many parameters affecting the preparation technique such as oxygen flow, sintering temperature, sintering time, and compacted pressure. The XRD-pattern exhibited a tetragonal phase for both Cu-1223, and Cu-1212. The resistivity measurement was considered the important experiment to show the predominant phase of superconductor if it was a high phase or low phase. The critical temperature (T c ) was about (128 K) for the high phase of Cu-1223, whereas the low phase of (Cu-1212) appeared at (T c = 64 K). The correlation between the Miller indices and resistivity measurements was a good tool to predicate the expected mechanism of conductivity within the unit cell. It was clear that the arrangement of these planes was aligned in the a-c direction. That should make the motion of the charge to be simpler by a stepping plane toward c-axis.

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“…These alloyed BaCaCu films were electrochemically oxidized from alkaline 1 N KOH solution at +0.7 V vs. SCE for 25 min. Many authors [11][12] presence of BaCuO 2 dominated samples generate the lower phases [13][14][15][16][17][18]. Whereas, the BaCO 3 is non-significant impurity phase formed due to exposure of sample to CO 2 in air.…”

Section: Oxidation Of Bacacu Films and Xrd Studiesmentioning

confidence: 99%

Synthesis of single-phase HgBa₂Ca₂Cu₃O₈₊high-T_csuperconducting films using the multistep electrolytic process

Shivagan

Shirage

Ekal

et al. 2003

Supercond. Sci. Technol.

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We report the multistep electrolytic process for the synthesis of high T c single phase HgBa 2 Ca 2 Cu 3 O 8+δ (Hg-1223) superconducting films. The process includes : i) deposition of BaCaCu precursor alloy, ii) oxidation of BaCaCu films, iii) electrolytic intercalation of Hg in precursor BaCaCuO films and iv) electrochemical oxidation and annealing of Hg-intercalated BaCaCuO films to convert into Hg 1 Ba 2 Ca 2 Cu 3 O 8+δ (Hg-1223).Films were characterized by thermo-gravimetric analysis (TGA) and differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrolytic intercalation of Hg in BaCaCuO precursor is proved to be a novel alternative to high temperature-high pressure mercuration process. The films are single phase Hg-1223 with T c = 121.5 K and J c = 4.3 x 10 4 A/cm 2 .* The corresponding author

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Synthesis and investigation of (Hg1−xCux)Ba2Ca2Cu3O8+δ

Cited by 5 publications

References 23 publications

Chemistry and structure of Hg-based superconducting Cu mixed oxides

Chemistry and structure of Hg-based superconducting Cu mixed oxides

The Correlation of Miller Indices with the Conductivity Mechanism of Cu-Based High-Tc Superconductor

Synthesis of single-phase HgBa₂Ca₂Cu₃O₈₊high-T_csuperconducting films using the multistep electrolytic process

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Synthesis and investigation of (Hg1−xCux)Ba2Ca2Cu3O8+δ

Cited by 5 publications

References 23 publications

Chemistry and structure of Hg-based superconducting Cu mixed oxides

Chemistry and structure of Hg-based superconducting Cu mixed oxides

The Correlation of Miller Indices with the Conductivity Mechanism of Cu-Based High-Tc Superconductor

Synthesis of single-phase HgBa2Ca2Cu3O8+ high-Tcsuperconducting films using the multistep electrolytic process

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Synthesis of single-phase HgBa₂Ca₂Cu₃O₈₊high-T_csuperconducting films using the multistep electrolytic process