Transparent polycrystalline garnets

Details Transparent polycrystalline garnets Transparent polycrystalline garnets

C - Chemistry, Metallurgy

09

K

C09K 11/80 (2006.01) C01G 15/00 (2006.01) C04B 35/50 (2006.01) C04B 35/645 (2006.01) C04B 35/65 (2006.01) C09K 11/68 (2006.01) C09K 11/77 (2006.01) G01N 23/04 (2006.01)

Patent

CA 2042263

RD-20,202 TRANSPARENT POLYCRYSTALLINE GARNETS Abstract of the Disclosure 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°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°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°C to a closed pore stage and then hot isostatically pressed at high pressure to provide the desired transparent body.

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