IR transmitting rare earth gallogermanate glass-ceramics

Details IR transmitting rare earth gallogermanate glass-ceramics IR transmitting rare earth gallogermanate glass-ceramics

1996-11-15

1998-07-28

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 42, 501904, C03C 3253, C03C 410

Patent

active

057862877

ABSTRACT:
A glass-ceramic article or composition which has better thermal and physical properties than the competing materials of zinc sulfide, spinel, or magnesium fluoride comprising 2-30 mole percent yttrium oxide and/or rare earth oxide, 25-80 mole percent germanium oxide, and 5-30 mole percent gallium oxide, based on the total moles of yttrium oxide and/or the rare earth oxide, germanium oxide, and gallium oxide; which article is over 80% by volume crystalline.

REFERENCES:
patent: 4575493 (1986-03-01), Rauch, Sr.
patent: 4999321 (1991-03-01), Kohli
patent: 5305414 (1994-04-01), Higby et al.
patent: 5486495 (1996-01-01), Jewell et al.

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