Solvolytic disproportionation of mixed-valence compounds. II. Tb/sub 11/O/sub 20/

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(88)90303-9· OSTI ID:6809499

Kang, Z C; Eyring, L

The intermediate higher oxides of terbium are solvolytically disproportionated in acid solution to yield Tb/sup 3 +/ (aq) ions and a residue of TbO/sub 2/(c). The starting material and the final solid product have fluorite-like structures requiring no reconstruction of the cation substructure. Tb/sub 11/O/sub 20/ was leached with a mixture of concentrated to hydrochloric and acetic acids and the product examined utilizing electron microscopy to reveal the mechanism of the reaction. It is apparent that all the oxide is dissolved from selected reaction pits to yield Tb/sup 3 +/ (aq) ions and H/sub 2/O. This dissolution is accompanied by oxygen transport into remote regions where Tb/sub 11/O/sub 20/ is oxidized to TbO/sub 2/. This forms an insoluble skeletal fragment of the original crystal. The reaction pits occur at dislocation/surface intersections.

• Research Organization: Arizona State Univ., Tempe (USA)
• OSTI ID: 6809499
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 75:1; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DECOMPOSITION
DIFFRACTION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INFORMATION
MICROSCOPY
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POWDERS
RARE EARTH COMPOUNDS
REDUCTION
SCATTERING
SOLVOLYSIS
TERBIUM COMPOUNDS
TERBIUM OXIDES
X-RAY DIFFRACTION