Japanese Journal of Applied Physics · 1987 · 67 citations · 17 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsCrystal ChemistryCrystal LatticeCrystallographyStructure DeterminationSuperconducting MaterialsX-ray CrystallographyCrystal Structure RefinementCuprate SuperconductorsLattice ConstantsNeutron Powder RefinementPowder Diffraction AnalysisPowder Neutron DiffractionRietveld AnalysisRietveld Refinement
The structure parameters of a superconductor with the nominal composition Ba 1.8 Nd 1.2 Cu 3 O 7- y were refined by the Rietveld analysis of TOF neutron powder diffraction data. This material is tetragonal with lattice constants a =3.8919 Å and c =11.6811 Å and isomorphous with Ba 1.5 La 1.5 Cu 3 O 7± y with an oxygen-deficient triperovskite structure. An oxygen site at (0, 1/2, 0) is 49% occupied, the Nd 3+ ion at (1/2, 1/2, 1/2) is coordinated to eight oxide ions, and a metal site at (1/2, 1/2, 0.1842) is 90% and 10% occupied by Ba 2+ and Nd 3+ ions, respectively.
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Structure of the single-phase high-temperature superconductor YBa2Cu3O7−δ
Mark A. Beno, L. Soderholm, D. W. Capone et al. · Applied Physics Letters · 1987 · 665 citations
New superconducting cuprate perovskites
D. W. Murphy, S. A. Sunshine, R. B. van Dover et al. · Physical Review Letters · 1987 · 400 citations