High pressure synthesis and magnetic properties for Hg1−xRexBa2Ca2Cu3Oy

Higuma, Hiroko; Miyashita, S.; Wakata, Mitsunobu

doi:10.1016/s0921-4534(97)01678-x

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Even though the Hg-based homologous series in the Hg-Ba-Ca-Cu-O system was the last discovered through normal-pressure synthesis, high-pressure synthesis has been advantageously applied for the synthesis of the Hg-1 (Ba) 2(n − 1)n phases as well, especially in the case of the higher members [141,142,[202][203][204][205][206][207][208][209]. Aiming at improving the stability of the Hg-based copper oxide phases, efforts have been made to synthesize Ba-free Hg-12(n − 1)n phases, especially the Hg-1 (Sr) 223 phase.…”

Section: M-12(n − 1)n Seriesmentioning

confidence: 99%

Application of high-pressure techniques: stabilization and oxidation-state control of novel superconductive and related multi-layered copper oxides

Yamauchi

Karppinen

2000

Supercond. Sci. Technol.

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Copper oxide superconductors possess multi-layered structures with a layer sequence of -CuO2 -(Q-CuO2 )n -1 -AO-(MO1± )m -AO- or -CuO2 -B-(O2 -B)s -1 -CuO2 -AO-(MO1± )m -AO- along the elongated c axis. Based on this layer sequence, the known copper oxide structures are categorized as members of the homologous series, Mm Ar Qn -1 Cun Om +r +2n ± (M-mr (n -1)n ; category A) or Mm A2k Bs Cu1+k Om +4k +2s ± (M-m (2k )s (1+k ); category B). Stabilization of such structures especially in the case of high values of the n /s parameter, i.e. the higher members of the homologous series, has been demonstrated to be apparently promoted under high pressures and/or strongly oxidizing conditions. Consequently, techniques for applying both high oxygen gas pressures (10-2000 atm) and ultra-high solid-medium pressures (2-8 GPa) have been advantageously utilized in synthesizing various superconductive copper oxide phases. Especially the ultra-high solid-medium pressure synthesis carried out in the so-called cubic-anvil/belt-type apparatus has proven to be extremely successful in synthesizing novel superconductive phases. In order to achieve high partial pressures of oxygen in the solid-medium environment, `external' oxygen-generating oxides such as KClO4 , KClO3 and Ag2 O2 are commonly added to the precursor mixtures. It is emphasized that in some cases it is possible to utilize `internal' oxidizing agents alone, i.e. highly oxidized precursors such as BaCuO2+ and Ba2 Cu3 O5+ containing metal constituents common with the desired copper oxide phase only. In the present paper, the potential and applications of high-pressure techniques in synthesizing multi-layered copper oxides and related structures are reviewed and discussed with emphasis on the important `historical' discoveries of novel phases and the present status of controlled production of high-quality samples of such phases.

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Section: M-12(n − 1)n Seriesmentioning

confidence: 99%

Application of high-pressure techniques: stabilization and oxidation-state control of novel superconductive and related multi-layered copper oxides

Yamauchi

Karppinen

2000

Supercond. Sci. Technol.

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“…Despite the fabrication difficulties, the Hg-based family has several important features, such as smaller separation of superconducting blocks [2][3][4], 1 Author to whom any correspondence should be addressed. less crystalline anisotropy [5], higher pinning energies and critical current densities [2,3,5,6] compared with the BSCCO and YBCO families. Also recent investigations on Hg-based materials have shown that substitution of Re improved the B irr due to the reduction in crystalline anisotropy and Hg deficiency and has beneficial effects on the phase stability and superconducting properties of Hg-based high-T c materials [5,[7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 97%

Fabrication and properties of (Hg_0.8Re_0.2)Ba₂Ca₂Cu₃O_xsuperconducting thick films

Yakıncı¹,

Aksan

Balci

2005

Supercond. Sci. Technol.

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Approximately 50 µm thick epitaxial c-axis orientated (Hg0.8Re0.2)Ba2Ca2Cu3Ox superconducting films have been prepared on MgO(100) substrates using a spraying process and post-Hg-vapour annealing. The effects of the heating temperature–time combinations and the filling factor of Hg (ffHg) on the physical, electrical and magnetic properties of the thick films have been investigated. The interesting observation was the formation of a thick interfacial layer between the film and the substrates. This interfacial layer was found to be protective against excessive diffusion and dissolution of the Mg2+ ions from the substrate or counter-diffusion of Ba, Ca and Cu ions from the films. The XRD investigations showed that the a–b plane of the HgRe-1223 phase aligns parallel to the substrate surface. The best Tc and Tzero were found to be 131.9 and 129.3 K, respectively. Magnetic properties up to 5 T have been investigated. The calculated value of critical current density, Jc, was found to be 4.82 × 105 A cm−2 at 4.5 K. The results obtained suggested that fabrication of HgRe-1223 thick film superconductors using a spraying process with 130 K transition is possible and they are very promising particularly for electronic applications.

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“…Fax: #46-08- 15 made by Isawa et al (4), as Pb was introduced at this site. Re (5) and Cu (6) have also been reported as charge reservoir substitutents. The (Tl, Hg) Ba Ca Cu O \B (2212) compound here in focus, with the atom ordering } (Tl, Hg)O V }(Tl, Hg)O V }BaO}CuO }Ca}CuO }BaO}, has been thoroughly investigated and subjected to several of the substitutions mentioned above.…”

Section: Introductionmentioning

confidence: 99%

X-Ray Diffraction Studies of 2212-Type Superconductors in the Tl–Hg–Ba–Sr–Ca–Cu–O System

Valldor

Boullay

Axnäs

et al. 2000

Journal of Solid State Chemistry

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High pressure synthesis and magnetic properties for Hg1−xRexBa2Ca2Cu3Oy

Cited by 9 publications

References 6 publications

Application of high-pressure techniques: stabilization and oxidation-state control of novel superconductive and related multi-layered copper oxides

Application of high-pressure techniques: stabilization and oxidation-state control of novel superconductive and related multi-layered copper oxides

Fabrication and properties of (Hg_0.8Re_0.2)Ba₂Ca₂Cu₃O_xsuperconducting thick films

X-Ray Diffraction Studies of 2212-Type Superconductors in the Tl–Hg–Ba–Sr–Ca–Cu–O System

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High pressure synthesis and magnetic properties for Hg1−xRexBa2Ca2Cu3Oy

Cited by 9 publications

References 6 publications

Application of high-pressure techniques: stabilization and oxidation-state control of novel superconductive and related multi-layered copper oxides

Application of high-pressure techniques: stabilization and oxidation-state control of novel superconductive and related multi-layered copper oxides

Fabrication and properties of (Hg0.8Re0.2)Ba2Ca2Cu3Oxsuperconducting thick films

X-Ray Diffraction Studies of 2212-Type Superconductors in the Tl–Hg–Ba–Sr–Ca–Cu–O System

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Fabrication and properties of (Hg_0.8Re_0.2)Ba₂Ca₂Cu₃O_xsuperconducting thick films