Method of forming yttria-gadolinia ceramic scintillator from ammonium dispersed oxalate precipitates

Patent · Mon Mar 30 23:00:00 EST 1992

OSTI ID:7237955

Dole, S L; Greskovich, C D

This patent describes a method of forming a polycrystalline translucent-to-transparent yttria-gadolinia composition scintillator that does not require milling. It comprises: coprecipitating oxalates of the yttria-gadolinia composition, drying the oxalates at about 75{degrees} to 125{degrees}C.; dispersing the oxalates by agitating an admixture of an aqueous suspension of the oxalates, and an effective amount of an ammonium hydroxide solution to disperse agglomerations of the oxalates; calcining the oxalates to substantially fully oxidize the oxalates and form a powder of the yttria-gadolinia composition; cold pressing the powder to form a compact; and sintering the compact in a reducing atmosphere or vacuum to form the polycrystalline translucent-to-transparent yttria-gadolinia scintillator.

• Assignee: General Electric Co., Schenectady, NY (United States)
• Patent Number(s): A; US 5100598
• Application Number: PPN: US 7-657032
• OSTI ID: 7237955
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
AGGLOMERATION
AMMONIUM COMPOUNDS
AMMONIUM HYDROXIDES
CALCINATION
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COLD PRESSING
COPRECIPITATION
CRYSTALS
DECOMPOSITION
DISPERSIONS
FABRICATION
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
GLASS SCINTILLATORS
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS WORKING
OPTICAL PROPERTIES
OXALATES
OXIDES
OXYGEN COMPOUNDS
PHOSPHORS
PHYSICAL PROPERTIES
POLYCRYSTALS
POWDERS
PRECIPITATION
PRESSING
PYROLYSIS
RARE EARTH COMPOUNDS
SEPARATION PROCESSES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES