Electron microscopy study of the superconductor ''Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+/delta//''

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Mod. Phys. Letters B; (United States)

DOI:https://doi.org/10.1142/S0217984988000060· OSTI ID:5616689

Hervieu, M; Michel, C; Domenges, B; Raveau, B; Laligant, Y; Lebail, A; Ferey, G

The structural study of the superconductor Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+/delta// was performed by X-ray diffraction on a single crystal, electron diffraction and electron microscopy. The structure of this oxide which crystallized in the space group Amaa, with /alpha/ /approx equal/ /alpha//sub rho//radical/ 2,b /approx equal/ a/sub rho/ /radical/ 2 and c /approx equal/ 30.7A can be described as an intergrowth of an oxygen deficient double perovskite layer -Sr/sub 2/CaCu/sub 2/O/sub 6//sub /infinity// with (BiO/sub y/)/sub 2/ layers. The E.D. patterns show the existence of satellites in incommensurate positions. The HREM images and their simulation suggest that the -BiO/sub y//sub /infinity// layers are not -Bi/sub 2/O/sub 2/ Aurivillius type layers. Modulations along the /alpha/ axis and much more rarely along b are observed. Stacking defects are rarely observed along c: they correspond to the intergrowth of a phase Bi/sub 2/Sr/sub 2/CuO/sub 6+/delta// which is assumed to be the superconductor at 22K previously detected for the nominal composition ''Bi/sub 2/Sr/sub 2/Cu/sub 2/O/sub 7/''.

• Research Organization: Laboratoire CRISMAT - ISMRa - Bd du Marechal Juin - 10432 Caen Cedex (FR); Laboratoire des Fluorures Ioniques, U.A. CNRS 449, Faculte des Sciences, Route de Laval, 72017 Le Mans Cedex (FR)
• OSTI ID: 5616689
• Journal Information: Mod. Phys. Letters B; (United States), Journal Name: Mod. Phys. Letters B; (United States) Vol. 2:1; ISSN MPLBE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALLIZATION
CRYSTALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
MICROSCOPY
MICROSTRUCTURE
MINERALS
MONOCRYSTALS
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE STUDIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION