Formation and decomposition of LaBa2Cu3O7 –δ

Skakle, Janet M. S.; West, Anthony R.

doi:10.1039/jm9940401745

Cited by 16 publications

(10 citation statements)

References 23 publications

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“…RECazCu~)a+w, which is seen only for RE=La, is "isostructural" [220,268] with the Sr14Cu24041 prototype {LaCa2CusOs.57; Cccm; 1130.5, 1261.0, 2760.8} [268]. In contrast to the prototype, this phase contains almost exactly divalent copper and is stable up to 1030~ where it melts incongruently [268].…”

Section: A Systems Re(o)--ca(o)-cu(o)mentioning

confidence: 86%

“…The La(O)-Ca(O)--Cu(O) phase diagram as seen at the same conditions [220,268] does not contain the Cal_yCuO2-type phase. Two genuine quaternary oxides are seen instead ( RE2CaCu206, actually a solid-solution phase (Lal_xCax)2CaCu206+ w with 0.0 <x < 0.1 [269][270][271].…”

Section: A Systems Re(o)--ca(o)-cu(o)mentioning

confidence: 88%

“…A mixture of the binary oxides is more stable below 680~ [175], referring to ambient partial pressures of [204,215] oxygen (730~ determined [217] from a change in decomposition products of more complex oxides, whereas 700~ is calculated from thermodynamic data [207]). m-RE2Cu2Os, has been observed [218][219][220] in an extremely narrow region of temperatures just above 1000*C for large trivalent RE=Nd and La. The crystal structure [218][219][220] {Nd2Cu2Os; C2/c; 1372.812), 365.66(2), 27.549(3), 105.1911)} [219], contains Cu-coordination octahedra connected by coordination squares, and has divalent copper.…”

Section: Systems Re(o)-cu(o)mentioning

confidence: 96%

“…m-RE2Cu2Os, has been observed [218][219][220] in an extremely narrow region of temperatures just above 1000*C for large trivalent RE=Nd and La. The crystal structure [218][219][220] {Nd2Cu2Os; C2/c; 1372.812), 365.66(2), 27.549(3), 105.1911)} [219], contains Cu-coordination octahedra connected by coordination squares, and has divalent copper. This phase is considered [218] to be a member of a structural series RE4+4nCus+2nO14+n, seen so far only for n=2 and n=3.…”

Section: Systems Re(o)-cu(o)mentioning

confidence: 96%

“…The crystal structure [221][222][223][224] contains sheets of square-planar, corner-sharing cuprate anions, interchanging with layers of isolated oxide anions, both layers interleaved by RE. Therefore t-RE2CuO4 is [220] really a cuprate oxide, and the formula could as well be written RE2(CuO2)O 2. Also this structure appears to be entropy stabilized [206].…”

Section: Systems Re(o)-cu(o)mentioning

confidence: 99%

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Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

Karen

Kjekshus

1997

Journal of Thermal Analysis

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Phase diagrams for cupratcs of alkaline earth and rare earth elements are presented, covering binary to quintenary oxides and including selected solid solution series with other elements. Elementary crystal chemical data are included for identification of the occurring phases. Chemical stability is discussed with respect to the high-temperature reactions with Lewis acids like CO2, protons, etc. Particularly the occurrence of oxide carbonates is consistently pointed out as one of the possible reasons for contradictory results in phase diagrams which comprise oxides with high basicity.

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Section: A Systems Re(o)--ca(o)-cu(o)mentioning

confidence: 86%

Section: A Systems Re(o)--ca(o)-cu(o)mentioning

confidence: 88%

Section: Systems Re(o)-cu(o)mentioning

confidence: 96%

Section: Systems Re(o)-cu(o)mentioning

confidence: 96%

Section: Systems Re(o)-cu(o)mentioning

confidence: 99%

See 3 more Smart Citations

Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

Karen

Kjekshus

1997

Journal of Thermal Analysis

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Hybrid YBa₂Cu₃O₇ Superconducting–Ferromagnetic Nanocomposite Thin Films Prepared from Colloidal Chemical Solutions

Bartolomé

Cayado

Solano

et al. 2017

Adv Elect Materials

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High T c superconductor-ferromagnetic heterostructures constitute an appealing playground to study the interplay between flux vortices and magnetic moments. Here, the capability of a solution-derived route to grow hybrid YBa 2 Cu 3 O 7 -ferromagnetic nanocomposite epitaxial thin films from preformed spinel ferrite (MFe 2 O 4 , M = Mn, Co) nanoparticles (NPs) is explored. The characterization, performed using a combination of structural and magnetic techniques, reveals the complexity of the resulting nanocomposites. Results show that during the YBCO growth process, most of the NPs evolve to ferromagnetic double-perovskite (DP) phases (YBaCu 2−x−y Fe x Co y O 5 /YBaCoFeO 5 ), while a residual fraction of preformed ferrite NPs may remain in the YBCO matrix. Magnetometry cycles reflect the presence of ferromagnetic structures associated to the DPs embedded in the superconducting films. In addition, a superparamagnetic signal that may be associated with a diluted system of ferromagnetic clusters around complex defects has been detected, as previously observed in standard YBCO films and nanocomposites. The hybrid nanocomposites described in this work will allow studying several fundamental issues like the nucleation of superconductivity and the mechanisms of magnetic vortex pinning in superconducting/ferromagnetic heterostructures.

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ChemInform Abstract: Formation and Decomposition of LaBa2Cu3O7‐δ.

Skakle

West

1995

ChemInform

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1995 electric properties, superconductors, semiconductors electric properties, superconductors, semiconductors D 8000 -009Formation and Decomposition of LaBa2Cu3O7-δ.-Single-phase tetragonal LaBa2Cu3O7-δ (123) can be prepared by heating a mixture of La2O3, BaCO3, and CuO at 875 • C for 4-16 h under flowing argon, while a mixture of La1+xBa2-xCu3O7-δ (x . apprx.0.2) and BaCuO2 is obtained in air or oxygen. The tetragonal 123 phase transforms into an orthorhombic superconductor with Tc (onset) . apprx.94 K on heating in oxygen at 400 • C. The orthorhombic and tetragonal structures (space groups Pmmm and P4/mmm, resp.) are confirmed by powder XRD; an orthorhombic-to-tetragonal transition occurs at δ = 0.2. Under the conditions studied the 123 phase appears to be not an equilibrium phase. -(SKAKLE, J. M. S.; WEST, A. R.; J.

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Formation and decomposition of LaBa₂Cu₃O_{7 –δ}

Cited by 16 publications

References 23 publications

Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

Hybrid YBa₂Cu₃O₇ Superconducting–Ferromagnetic Nanocomposite Thin Films Prepared from Colloidal Chemical Solutions

ChemInform Abstract: Formation and Decomposition of LaBa2Cu3O7‐δ.

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Formation and decomposition of LaBa2Cu3O7 –δ

Cited by 16 publications

References 23 publications

Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

Phase diagrams for the YBa2Cu3O7 family — ANNO 1996

Hybrid YBa2Cu3O7 Superconducting–Ferromagnetic Nanocomposite Thin Films Prepared from Colloidal Chemical Solutions

ChemInform Abstract: Formation and Decomposition of LaBa2Cu3O7‐δ.

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Formation and decomposition of LaBa₂Cu₃O_{7 –δ}

Hybrid YBa₂Cu₃O₇ Superconducting–Ferromagnetic Nanocomposite Thin Films Prepared from Colloidal Chemical Solutions