High-energy milling of WO[sub 3] oxides: Amorphization and reaction with Cs[sub 2]CO[sub 3]
- Universite de Picardie Jules Verne, Amiens (France)
Three WO[sub 3] oxides with ReO[sub 3]-, pyrochlore-, and hexagonal-type structures have been studied in nonreactive and reactive grinding conditions by high-energy ball milling. In nonreactive grinding conditions, pyrochlore- and hexagonal-type WO[sub 3] oxides amorphize by collapse of the oxide structure. Monoclinic WO[sub 3] cannot be amorphized in these experimental conditions: The effect of high-energy ball milling is to decrease the crystallite size to a limit value. In reactive grinding conditions WO[sub 3] + Cs[sub 2]CO[sub 3] mixtures lead to the formation of a lacunar cubic pyrochlore-type cesium tungstate. The reaction kinetics are strongly influenced by the WO[sub 3] oxide structure and its behavior in nonreactive grinding. The mechanochemical reactivity is higher for monoclinic WO[sub 3] and seems to depend on the presence of intercrystallite boundaries rather than on the amorphous oxide phase.
- OSTI ID:
- 6770044
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 111:1; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
AMORPHOUS STATE
CARBON COMPOUNDS
CARBONATES
CESIUM CARBONATES
CESIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
KINETICS
MACHINING
MILLING
MONOCLINIC LATTICES
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES