Transparent polycrystalline garnets

Transparent, polycrystalline garnet bodies having desirable properties for use as laser material, luminescent x-ray scintillator materials and other uses are produced by mixing a chloride source solution of the desired cations with a basic ammonium solution to produce a precipitate having a substant...

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Bibliographic Details
Main Authors CHARLES D. GRESKOVICH, WILLIAM P. MINNEAR, CHESTER R. O'CLARK
Format Patent
LanguageEnglish
Published 27.01.1999
Edition6
Subjects
ADHESIVES
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
CONCRETE
DYES
INORGANIC CHEMISTRY
LIME, MAGNESIA
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
MEASUREMENT OF NUCLEAR OR X-RADIATION
MEASURING
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PHYSICS
POLISHES
REFRACTORIES
SLAG
TESTING
TREATMENT OF NATURAL STONE
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Summary:Transparent, polycrystalline garnet bodies having desirable properties for use as laser material, luminescent x-ray scintillator materials and other uses are produced by mixing a chloride source solution of the desired cations with a basic ammonium solution to produce a precipitate having a substantially uniform composition which can be further processed to provide the desired transparent body. This precipitate is separated from the solution, dried, thermally decomposed at a temperature in the range from 700 to 1,000 DEG C, pressed to form a compact, isostatically pressed at up to 60,000 psi to provide a green, unsintered compact having a density in the vicinity of 55% of theoretic density. That green compact is then sintered in oxygen at a temperature between 1,400 and 1,700 DEG C to produce the desired transparent body. Alternatively, the compact may be sintered in oxygen at temperatures in the range from about 1,400 to about 1,600 DEG C to a closed pore stage and then hot isostatically pressed at high pressure to provide the desired transparent body.
Bibliography:Application Number: CN19911004322