Journal ArticleDOI
Compounds and phase compatibilities in the system La2O3SrOCuO at 950°C
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TLDR
In this paper, the subsolidus phase diagram of the system La 2 O 3 SrOCuO at 950°C under 1 bar of pure oxygen has been investigated and a new ternary compound, La 1+ x Sr 2− x Cu 2 O 5.5+δ with 0.05 ≤ x ≤ 0.15, was isolated.About:
This article is published in Journal of Solid State Chemistry.The article was published on 1989-06-01. It has received 60 citations till now. The article focuses on the topics: Perovskite (structure) & Lattice constant.read more
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A new family of copper oxide superconductors Srn+1CunO2n+1+δ stabilized at high pressure
TL;DR: In this paper, a new family of high-pressure phases with the formula Srn+1CunO2N+1+δ (n = 1, 2, 3,...) extending from Sr2CuO3.1.
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Structures of High‐Temperature Cuprate Superconductors
Chan Park,Robert L. Snyder +1 more
TL;DR: Most of the known cuprate superconductors are shown to belong structurally to a single family and are closely related to each other as discussed by the authors, which leads to three significant insights into the nature of, and requirements for, superconductivity in these phases: (1) a nearly planar sheet of CuO{sub 2} supports the supercurrent; (2) as the distance between the n ACuO{ sub 2} blocks in a crystal structure increases, the critical current density decreases at high reduced temperatures due to the magnetic flux lines becoming unpinned; (
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An ionic model of the crystal chemistry in the superconducting copper oxides of stoichiometry (RE)2CuO4
TL;DR: In this paper, the authors investigated the crystal chemistry and phase stability of the mixed rare earth systems La 2− x RE x CuO 4 (RE = NdY) and found a definitive correlation between the size of the RE cation and structure, and the stability limits of the related K 2 NiF 4 (T )-, Nd 2 CuO4 (T′ )-, and hybrid T∗ -type structures.
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La2SrCu2O6: Neutron diffraction study
TL;DR: In this article, a detailed neutron diffraction study of La2SrCu2O6 was conducted to confirm the preliminary X-ray diffraction investigation and showed that the intercalation of oxygen between the copper planes is really favored in this structure owing to the bigger size of the cation interleaved between copper layers compared to the calcium or yttrium in other layered cuprates.
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Energetics of La2−xSrxCuO4−y solid solutions (0.0 ≤ x ≤ 1.0)
Joseph Bularzik,Alexandra Navrotsky,Joseph DiCarlo,Joseph F. Bringley,Bruce A. Scott,Steven Trail +5 more
TL;DR: In this paper, high temperature solution calorimetry in molten lead borate was used to determine the heats of formation from oxide components, and the heat of oxidation was determined to be {minus}129 kJ/(mole O{sub 2}) by a comparison of samples with the same strontium content but a different oxygen content.
References
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Journal ArticleDOI
Possible high Tc superconductivity in the Ba-La-Cu-O system
TL;DR: In this paper, Ba−La−Cu−O system, with the composition BaxLa5−xCu5O5(3−y) have been prepared in polycrystalline form, and samples with x=1 and 0.75,y>0, annealed below 900°C under reducing conditions, consist of three phases, one of them a perovskite-like mixed-valent copper compound.
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Bulk superconductivity at 36 K in La1.8Sr0.2CuO4.
TL;DR: The results of resistivity and magnetic susceptibility measurements in La/sub 2-//sub x/Sr/sub X/CuO/sub 4/ for x less than or equal to 0.3 were reported in this article.
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Anomalous disappearance of high-Tc superconductivity at high hole concentration in metallic La2-xSrxCuO4.
TL;DR: It is found that T/sub c/ is constant at approx.36 K from p = 0.15 to 0.24, where it begins to decrease, and beyond papprox. =0.32, superconductivity disappears, even though the samples are more conducting.
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The structure of La2CuO4 and LaSrVO4
J.M. Longo,P.M. Raccah +1 more
TL;DR: The authors examined the structure of La2CuO4 at room temperature and found it to be an orthorhombic distortion of the K2NiF4 structure (a = 5.363 A, b = 4.409 A, c = 13.17 A).
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The incommensurate structure of (Sr14−xCax)Cu24O41 (0 < x ∼ 8) a superconductor byproduct
TL;DR: The structure of the title compound, Sr8Ca6Cu24O41 and Sr14Cu 24O41, has been determined by x-ray, single-crystal diffraction techniques as discussed by the authors.