Encapsulation method for the synthesis of nearly single-phase superconducting HgBa2Ca2Cu3O8+δ with Tc⩾ 135 K

Isawa, K.; Tokiwa‐Yamamoto, A.; Itoh, Makoto; Adachi, Seiji; Yamauchi, H.

doi:10.1016/0921-4534(94)90111-2

Cited by 82 publications

(18 citation statements)

References 18 publications

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“…One can conclude that the pre-sintering was the reason to predominate the low phase of Cu-1212. In general, the carrier motion directed in the a-c direction for Cu-1223 and Cu-1212 as mentioned before [14]. The small difference in the lattice constants between them related to the extra oxygen, which pumped during the pre-sintering process.…”

Section: Resultsmentioning

confidence: 72%

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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Section: Resultsmentioning

confidence: 72%

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

Maher¹,

Al‐Shakarchi²

2017

JMP

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“…A Hg-1223 sample was prepared by using the method presented by Isawa et al [8]. The other samples were prepared as described in [6].…”

Section: Methodsmentioning

confidence: 99%

Characterization of physicochemical properties of high-temperature superconductor surfaces using nitrogen adsorption

Staszczuk

Sternik

Chądzyński³

et al. 2004

Journal of Alloys and Compounds

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“…However, great difficulty in synthesizing these materials is a bottleneck to commercial production. It was reported that controlled atmosphere using a glove box is required due to the high sensitivity of precursors Ba2Ca,-lCu,0y to moisture and carbon dioxide [2], [3]. Another poor property of Hg-1223 is relatively low irreversibility field (Birr) of -2 T at 77 K in spite of its high Tc [4].…”

Section: Introductionmentioning

confidence: 99%

Properties of (Hg,X)-1223 superconductors synthesized without using a glove box

Fujii

Kumakura²,

Togano³

1999

IEEE Trans. Appl. Supercond.

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We tried to synthesize (Hg,X)BazCa,.iCu,,O, (HgX-12(n-l)n) superconductors for the substitution of various elements X without using a glove box. For X=V, Cr, Mn, Ge, MO, Ru and Re, we succeeded in the formation of the phases of n=2,1,2,1,3,3 and 3, respectively. It is suggested that the substitution of X for Hg is effective to stabilize the structures of HgX-12(n-l)n phases. Studies of microstructure and superconducting properties on HgMo-and HgRe-1223 revealed that the melt texturing was observed only for MgMo-1223 and that the Tc's of both samples were above 130 K, almost equal to that of Hg-1223. The irreversibility fields of HgMo-and HgRe-1223 were roughly estimated to be about 1.6 and 3 T at 90 K, respectively. These values are higher than that of Hg-1223. It is speculated that this enhancement is due to the improved coupling of Cu-0 planes by the contraction of c-axis or the carrier doping by oxygen atoms introduced in the Hg-(0) layer.

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Encapsulation method for the synthesis of nearly single-phase superconducting HgBa2Ca2Cu3O8+δ with Tc⩾ 135 K

Cited by 82 publications

References 18 publications

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

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

Characterization of physicochemical properties of high-temperature superconductor surfaces using nitrogen adsorption

Properties of (Hg,X)-1223 superconductors synthesized without using a glove box

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