The crystal and magnetic structures of Ba sub 3 NiRu sub 2 O sub 9 , Ba sub 3 CoRu sub 2 O sub 9 , and Ba sub 3 ZnRu sub 2 O sub 9

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(90)90309-L· OSTI ID:6107422

Lightfoot, P; Battle, P D ^[1]

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1. Univ. of Leeds (England)

The crystal structures of the 6H perovskites Ba{sub 3}NiRu{sub 2}O{sub 9}, Ba{sub 3}ZnRu{sub 2}O{sub 9}, and Ba{sub 3}CoRu{sub 2}O{sub 9} have been refined from neutron powder diffraction data collected at 5 or 2 K. Ba{sub 3}NiRu{sub 2}O{sub 9} and Ba{sub 3}ZnRu{sub 2}O{sub 9} have hexagonal symmetry, space group P6{sub 3}/mmc: a{sub Ni} = 5.7256(2), c{sub Ni} = 14.0596(2) {angstrom}; a{sub Zn} = 5.7549(2), c{sub Zn} = 14.1328(2) {angstrom}. Ba{sub 3}CoRu{sub 2}O{sub 9} undergoes a phase transition from hexagonal symmetry at room temperature to orthorhombic symmetry at 2 K, space group Cmcm: a{sub Co} = 5.7456(1), b{sub Co} = 9.9177(2), c{sub Co} = 14.0862(3) {angstrom}. In all three compounds the cation sites within the face-sharing octahedra of the 6H structure are occupied by Ru{sup 5+}; the corner-sharing octahedra are occupied by Zn{sup 2+}, Ni{sup 2+}, or Co{sup 2+}. The neutron diffraction data show that Ba{sub 3}NiRu{sub 2}O{sub 9} is magnetically ordered at 5 K, with antiferromagnetic coupling between Ru{sup 5+} ions in the Ru{sub 2}O{sub 9} dimers and ferromagnetic coupling along approximately linear Ni{sup 2+}-O-Ru{sup 5+} superexchange pathways.

• OSTI ID: 6107422
• Journal Information: Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 89:1; ISSN JSSCB; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COBALT COMPOUNDS
COBALT OXIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
HEXAGONAL LATTICES
INFORMATION
LATTICE PARAMETERS
MAGNETIC MOMENTS
NEUTRON DIFFRACTION
NICKEL COMPOUNDS
NICKEL OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
RUTHENIUM OXIDES
SCATTERING
SPACE GROUPS
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
ZINC COMPOUNDS
ZINC OXIDES