Neutron diffraction study of LaBa/sub 2/Cu/sub 3/O/sub 7-delta/

Journal Article · Thu Sep 01 00:00:00 EDT 1988 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(88)90213-7· OSTI ID:7046065

Sequeira, A; Rajagopal, H; Ganapathi, L; Rao, C N.R.

The correlation between structure and oxygen content in the LaBa/sub 2/Co/sub 3/O/sub 7+delta/ was investigated by neutron powder diffraction. It is shown that the structure is orthorhombic (Pmmm) when delta = -0.04 and tetragonal (P4/mmm) when delta = -0.06. Such a change in structure accompanying a very small variation in oxygen stoichiometry is remarkable. In the orthorhombic structure of the delta = -0.04 sample, there is 70% oxygen occupancy for the linear chain site (0, 1/2, 0) and 34% for the (1/2, 0, 0) site. The La sites have 13.6% Ba when delta = -0.04 and 11.2% Ba when delta = -0.06; the Ba sites have 10% La in both cases.

• Research Organization: Bhabha Atomic Research Centre, Bombay (India)
• OSTI ID: 7046065
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 76:1; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NEUTRON DIFFRACTION
NONMETALS
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN
OXYGEN ADDITIONS
OXYGEN COMPOUNDS
POWDERS
QUANTITY RATIO
RARE EARTH COMPOUNDS
SCATTERING
STOICHIOMETRY
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS