Synthesis and crystallographic characterization of the mixed-valence reduced nickelate La sub 1. 6 Sr sub 0. 4 (Ni sup +I ,Ni sup +II )O sub 3. 47
- CNRS, Orleans (France)
- Universite d'Orleans (France)
The new mixed-valence nickelate La{sub 1.6}Sr{sub 0.4}(Ni{sup +I}, Ni{sup +II})O{sub 3.47} was prepared by low-temperature reduction of the oxide La{sub 1.6}Sr{sub 0.4}NiO{sub 4.10} at 670 K under hydrogen. This strongly reduced nickelate - 65% Ni{sup +I} - is stable in air, at room temperature. The crystallographic characterization points to an orthorhombic unit cell: a = 3.8729(6) {angstrom}, b = 3.7242(6) {angstrom}, c = 12.767(2) {angstrom}. Structure calculations evidence an oxygen-deficient K{sub 2}NiF{sub 4}-type structure. The oxygen vacancies are found only in the NiO{sub 2} equatorial planes, leading to a lowering of the nickel coordination. The main feature is the occurrence of Ni-O squares systematically orientated along the c-axis.
- OSTI ID:
- 6883608
- Journal Information:
- Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 84:1; ISSN 0022-4596; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-temperature transport properties, thermal expansion and cathodic performance of Ni-substituted LaSr{sub 2}Mn{sub 2}O{sub 7-{delta}}
Crystal structures of the new diphosphates, K{sub 2}NiP{sub 2}O{sub 7} and K{sub 6}Sr{sub 2}Ni{sub 5}(P{sub 2}O{sub 7}){sub 5}
Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DATA ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MEASURING INSTRUMENTS
MEASURING METHODS
NICKEL COMPOUNDS
NICKEL OXIDES
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS