An electron diffraction study of Bi sub 2 Sr sub 2 (Gd sub x Ca sub 1 minus x ) sub 0. 8 Cu sub 2 O sub 8+. delta
- Texas Center for Superconductivity, University of Houston, Houston, TX (USA)
The compound Bi{sub 2}Sr{sub 2}(Gd{sub {ital x}}Ca{sub 1{minus}{ital x}}){sub 0.8}Cu{sub 2}O{sub 8+{delta}} is examined by electron diffraction for several values of {ital x}. The incommensurate modulation which has been reported for {ital x}=0 persists for all values of {ital x} with the wave vector increasing as {ital x} increases. A secondary modulation with a wave vector equal to one half that of the primary is observed for {ital x}{ge}0.85. This modulation manifests itself through satellite reflections that are highly streaked normal to the (001) planes and that flank certain select positions in reciprocal space. The appearance of this secondary modulation is accompanied by a change in the average crystal structure from {ital B}-centered to {ital F}-centered orthorhombic.
- OSTI ID:
- 6550309
- Journal Information:
- Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 5:8; ISSN JMREE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HIGH-TC SUPERCONDUCTORS
INFORMATION
MODULATION
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS