High-pressure synthesis of single-phase superconductors HgzSrxBa2−xCa2Cu3O8+δ and (Hg, M)Sr2Ca2Cu3Oy with MPb and Mo

He, Zhiyuan; Lin, Q. M.; Gao, Li; Sun, Yanyi; Xue, Y. Y.; Chu, C. W.

doi:10.1016/0921-4534(94)02318-2

Cited by 38 publications

(11 citation statements)

References 30 publications

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“…The precursor, which was made of BaCO 3 , CaCO 3 , and CuO in the ratio 2 : 2 : 3, was sintered at 900 C for 12 h in flowing high-purity oxygen gas. Since the stoichiometric mixture ratio, namely, HgO : Ba 2 Ca 2 Cu 3 -O y ¼ 1 : 1, tends to result in the formation of CaHgO 2 as a secondary phase, 7) we adopted the slightly Hg-deficient starting composition of Hg 0:75 Ba 2 Ca 2 Cu 3 O y (HgO : Ba 2 Ca 2 -Cu 3 O y ¼ 0:75 : 1). The mixture was pressed into a cylindrical shape, charged in a gold capsule, and then heated at 830 C under 2 GPa for 0.5 h, using a cubic-anvil HP apparatus (TRY Engineering, 180-ton press).…”

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confidence: 99%

Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

et al. 2013

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We measured the electrical resistivity of a HgBa 2 Ca 2 Cu 3 O 8þ (Hg-1223) polycrystalline sample under high pressure. Owing to the improved sample quality and the nearly hydrostatic pressure, we successfully observed zero resistivity, which is the unambiguous signature of superconductivity, up to the unprecedented temperature of 153.0 K at 15 GPa. This temperature surpasses the previous records by more than 10 K. Referring to the experimental results, we established the exact pressure (P) vs superconducting transition temperature (T c ) relationship. T c increases with P up to 15 GPa, suggesting the possibility of further enhancement of T c at higher pressures.

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Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

et al. 2013

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“…In the following, we analyze the reduction of the c-axis of the Hg-1223 cell due to Sr substitution by comparing the values of the c-axis for undoped Hg-1(Ba,Sr)223 (5, 21) We want to highlight that the synthesis of undoped phase with strontium substitution is possible only under the high-pressure technique (5). All these data are summarized in Table 1.…”

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confidence: 99%

Structural and Superconducting Properties of Hg0.75Re0.25Ba2−xSrxCa2Cu3O8+δ Superconductors Grown by Sol–Gel and Sealed Quartz Tube Synthesis

Sin¹,

Alsina

Mestres

et al. 2001

Journal of Solid State Chemistry

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“…Shimoyama et al demonstrated that partial replacement of Hg by a transition metal cation, M, coupled with the substitution of Ba by Sr, in the (Hg 1−x M x )Sr 2 (Ln 1−y Ca y ) n−1 Cu n O 2n+2+δ system (n = 1 and 2, Ln = trivalent lanthanide) afforded a significant improvement in flux pinning characteristics [6,7]. The transition metal cation adopts a pivotal structural role in such materials, as demonstrated by the fact that members of the hypothetical HgSr 2 Ca n−1 Cu n O 2n+2+δ system cannot be prepared even under the forcing conditions of high pressure methods [8]. The stabilizing influence of the transition metal cation arises from the additional oxygen atoms associated with the tetrahedral or octahedral coordination environment of the transition metal, which serves to fix additional oxygen atoms in the (Hg,M)O δ plane [9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and superconducting properties of the (Hg_1 xRe_x)Sr₂(Nd_1 yCa_y)Cu₂O₆₊system

Hyatt

Gameson

Edwards

2004

Supercond. Sci. Technol.

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The synthesis, structure and superconducting properties of the (Hg 1−x Re x )Sr 2 (Nd 1−y Ca y )Cu 2 O 6+δ system (with 0 x 0.2 and 0.2 y 0.6) have been investigated. Near single phase compositions with x = 0.2 and 0.2 y 0.6 may be prepared by solid state reaction at room pressure. The maximum T c = 100 K in this system is found for the nominal composition (Hg 0.8 Re 0.2 )Sr 2 (Nd 0.6 Ca 0.4 )Cu 2 O 6+δ . Rietveld analysis of time-of-flight neutron powder diffraction data from a sample with the refined composition Hg 0.78 Re 0.22 Sr 2 Nd 0.59 Ca 0.41 Cu 2 O 6.88 indicates that the rhenium cation in the (Hg,Re)O δ layer of this material is hexavalent and six coordinate. On the basis of x-ray and neutron powder diffraction data, the Hg and Re cations in the (Hg,Re)O δ layer of Hg 0.78 Re 0.22 Sr 2 Nd 0.59 Ca 0.41 Cu 2 O 6.88 appear to be randomly distributed, in contrast to the ordered nature of these cations in similar materials prepared by high pressure methods. The irreversibility field of essentially optimally doped Hg 0.78 Re 0.22 Sr 2 Nd 0.59 Ca 0.41 Cu 2 O 6.88 indicates no enhancement of the kind reported in similar materials prepared under high pressure. We suggest that this difference may be associated with (dis)ordering of the Hg and Re cations in the (Hg,Re)O δ layer of these materials.

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High-pressure synthesis of single-phase superconductors HgzSrxBa2−xCa2Cu3O8+δ and (Hg, M)Sr2Ca2Cu3Oy with MPb and Mo

Cited by 38 publications

References 30 publications

Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

Structural and Superconducting Properties of Hg0.75Re0.25Ba2−xSrxCa2Cu3O8+δ Superconductors Grown by Sol–Gel and Sealed Quartz Tube Synthesis

Synthesis, structure and superconducting properties of the (Hg_1 xRe_x)Sr₂(Nd_1 yCa_y)Cu₂O₆₊system

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High-pressure synthesis of single-phase superconductors HgzSrxBa2−xCa2Cu3O8+δ and (Hg, M)Sr2Ca2Cu3Oy with MPb and Mo

Cited by 38 publications

References 30 publications

Zero Resistivity above 150 K in HgBa2Ca2Cu3O8+δat High Pressure

Zero Resistivity above 150 K in HgBa2Ca2Cu3O8+δat High Pressure

Structural and Superconducting Properties of Hg0.75Re0.25Ba2−xSrxCa2Cu3O8+δ Superconductors Grown by Sol–Gel and Sealed Quartz Tube Synthesis

Synthesis, structure and superconducting properties of the (Hg1 xRex)Sr2(Nd1 yCay)Cu2O6+ system

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Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

Zero Resistivity above 150 K in HgBa₂Ca₂Cu₃O_8+δat High Pressure

Synthesis, structure and superconducting properties of the (Hg_1 xRe_x)Sr₂(Nd_1 yCa_y)Cu₂O₆₊system