Room temperature chemical oxidation of delafossite-type oxides
- Laboratoire de Chimie du Solide du CNRS, Talence (France)
- Universite Cadi Ayyad, Marrakech (Morocco)
Examination of the delafossite-type structure of CuLaO[sub 2] and CuYO[sub 2] suggests that there is room enough to accommodate intercalated oxide ions and the charge compensation resulting simply from the oxidation of an equivalent amount of Cu[sup +] into Cu[sup 2+]. Reaction with hypohalites in an aqueous solution leads to color change. Evidence of the formation of Cu[sup 2+] is given by TGA, iodometric titration, and magnetic (static and EPR) measurements. The obtained La and Y compounds seem to behave in a different way: Whereas CuLaO[sub 2+x] appears as a single phase, CuYO[sub 2+x] corresponds to a two-phase mixture, with respectively low and high x values, the latter being isostructural with the thermally oxidized compound recently reported. Comparison is stressed between the oxides obtained at higher temperatures.
- OSTI ID:
- 6922964
- Journal Information:
- Journal of Solid State Chemistry; (United States), Vol. 111:1; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
COPPER OXIDES
OXIDATION
LANTHANUM OXIDES
YTTRIUM OXIDES
ELECTRON SPIN RESONANCE
THERMAL GRAVIMETRIC ANALYSIS
TITRATION
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COPPER COMPOUNDS
GRAVIMETRIC ANALYSIS
LANTHANUM COMPOUNDS
MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
RESONANCE
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies