The substitution of CO[sub 3] groups for copper in Y[sub 1[minus]x]Ca[sub x]Ba[sub 2]Cu[sub 3]O[sub 7]: HREM study
Journal Article
·
· Journal of Solid State Chemistry; (United States)
OSTI ID:5047859
- Universite de Caen (France)
The carbonation of the 123-type cuprates (Y[sub 1[minus]x]Ca[sub x])[sub n]Ba[sub 2n]Cu[sub 3n[minus]1]CO[sub 3]O[sub 7n[minus]3] has been studied by high-resolution electron microscopy. The investigation of the system, varying x and n, shows that the most stable phase is the n = 2 member. A structural model is proposed from XRD profile analysis for Y[sub 1.3]Ca[sub 0.7]Ba[sub 4]Cu[sub 5]CO[sub 3]O[sub 11]. The contrast of the HREM images was calculated on the basis of the XRD data and is discussed depending on focus values, carbon substitution, and crystal thickness. The study of the distribution of the CO[sub 3] groups versus composition shows that different n members are locally stabilized, from n = 1 to n = [infinity]. Short thermal treatments involve the formation of local ordering, in domains of some tens of angstroms width, which correspond to local superstructures along [110] and [031]; 90[degrees] oriented domains are frequent phenomena in these materials, and the boundaries are generally parallel to (001). Some intergrowth defects, in the form of [open quotes]124[close quotes] members, are observed.
- OSTI ID:
- 5047859
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 108:2; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
Similar Records
New extended defects in the superconductive [open quotes]123[close quotes] oxycarbonitrate YCaBa[sub 4]Cu[sub 5](NO[sub 3])[sub x](CO[sub 3])[sub 1[minus]x]O[sub 11]: HREM study
Substitution of [open quotes]CO[sub 3][close quotes] groups for copper in YBCO: The oxycarbonates Y[sub n]Ba[sub 2n]Cu[sub 3n[minus]1]Co[sub 3]O[sub 7n[minus]3]
The oxycarbonate Y[sub 1. 6]Ca[sub 0. 4]Ba[sub 4]Cu[sub 5]CO[sub 3]O[sub 11], n = 2 member of the [open quotes]123[close quotes]-type derivatives (Y[sub 1[minus]x]Ca[sub x])[sub n]Ba[sub 2n]Cu[sub 3n[minus]1]CO[sub 3]O[sub 7n[minus]3]
Journal Article
·
Sun Aug 01 00:00:00 EDT 1993
· Chemistry of Materials; (United States)
·
OSTI ID:7207492
Substitution of [open quotes]CO[sub 3][close quotes] groups for copper in YBCO: The oxycarbonates Y[sub n]Ba[sub 2n]Cu[sub 3n[minus]1]Co[sub 3]O[sub 7n[minus]3]
Journal Article
·
Sun Oct 31 23:00:00 EST 1993
· Chemistry of Materials; (United States)
·
OSTI ID:5091605
The oxycarbonate Y[sub 1. 6]Ca[sub 0. 4]Ba[sub 4]Cu[sub 5]CO[sub 3]O[sub 11], n = 2 member of the [open quotes]123[close quotes]-type derivatives (Y[sub 1[minus]x]Ca[sub x])[sub n]Ba[sub 2n]Cu[sub 3n[minus]1]CO[sub 3]O[sub 7n[minus]3]
Journal Article
·
Thu Jul 01 00:00:00 EDT 1993
· Journal of Solid State Chemistry; (United States)
·
OSTI ID:5629327
Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CUPRATES
DIFFRACTION
ELECTRON MICROSCOPY
MICROSCOPY
MILLER INDICES
OXYGEN COMPOUNDS
PHASE STABILITY
PHASE STUDIES
SCATTERING
STABILITY
STOICHIOMETRY
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CUPRATES
DIFFRACTION
ELECTRON MICROSCOPY
MICROSCOPY
MILLER INDICES
OXYGEN COMPOUNDS
PHASE STABILITY
PHASE STUDIES
SCATTERING
STABILITY
STOICHIOMETRY
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS