A new family of structures: the oxides Ln/sub 4-2x/Ba/sub 2+2x/Zn/sub 2-x/O/sub 10-2x/ (Ln = La, Nd) (in French)
Journal Article
·
· J. Solid State Chem.; (United States)
Two original compounds, Ln/sub 4-2x/Ba/sub 2+2x/Zn/sub 2-x/O/sub 10-2x/, were isolated for Ln = La, Nd and 0 less than or equal to x less than or equal to 0.25. These oxides are tetragonal with a and c parameters close to 6.91 and 11.59 angstrom, respectively, for lanthanum, and 6.75 and 11.54 angstrom for neodymium. The structure of these phases was determined from X-ray powder patterns in the most symmetric space group, I4/mcm, using Patterson and Fourier functions for x = 0. The structure should be compared to that of copper oxides La/sub 4-2x/Ba/sub 2+2x/Cu/sub 2-x/O/sub 10-2x/: it is built up of identical Ln/sub 2/O/sub 5/ layers formed from face- and edge-sharing LnO/sub 8/ polyhedra, between which Ba/sup 2+/ and Zn/sup 2+/ ions are inserted. Contrary to the copper compounds, two succesive Ln/sub 2/O/sub 5/ layers are rotated by 90/sup 0/, involving a doubling of c. The result of Zn/sup 2+/ is tetrahedral coordination, while the coordination of Ba/sup 2+/ becomes a bicapped antiprism.
- Research Organization:
- Universite de Caen, France
- OSTI ID:
- 6576793
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Journal Issue: 2 Vol. 42:2; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- French
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Tue Aug 01 00:00:00 EDT 1995
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OSTI ID:86569
Formation of new compounds Ln{sub 4}Al{sub 2}O{sub 9} in the Ln{sub 2}O{sub 3}{center_dot}Al{sub 2}O{sub 3} system (Ln = La, Pr, Tb)
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COORDINATES
CRYSTALS
DATA
DIFFRACTION
DISTANCE
EXPERIMENTAL DATA
FOURIER ANALYSIS
INFORMATION
INTERATOMIC DISTANCES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LATTICE PARAMETERS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
STEREOCHEMISTRY
STRUCTURAL CHEMICAL ANALYSIS
X-RAY DIFFRACTION
ZINC COMPOUNDS
ZINC OXIDES
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COORDINATES
CRYSTALS
DATA
DIFFRACTION
DISTANCE
EXPERIMENTAL DATA
FOURIER ANALYSIS
INFORMATION
INTERATOMIC DISTANCES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LATTICE PARAMETERS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
STEREOCHEMISTRY
STRUCTURAL CHEMICAL ANALYSIS
X-RAY DIFFRACTION
ZINC COMPOUNDS
ZINC OXIDES