Glass-ceramics containing NZP-type crystals

Details Glass-ceramics containing NZP-type crystals Glass-ceramics containing NZP-type crystals

1987-11-27

1988-11-15

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 4, C03C 1002

Patent

active

047849762

ABSTRACT:
This invention is directed to the production of glass-ceramic articles wherein a NZP-type crystals constitutes essentially the sole crystal phase. The inventive articles are prepared by heat treating precursor glass articles with compositions having the stoichiometry characterized by the formula A.sub.0-4 B.sub.2 (XO.sub.4).sub.3 wherein A represents at least one monovalent or divalent cation selected from the group consisting of Zn, Mg, Mn, Fe, Co, Ni, Cu, Ca, Cd, Sr, Ba, Tb, Li, Na, and K, B represents at least one trivalent, tetravalent, or pentavalent cation selected from the group consisting of Fe, Ti, Cr, Zr, Nb, Mo, In, Sn, Y, and a RE, and X represents P cations which may be partially replaced by Si cations, and the cation ratio B:X is essentially 2:3.

REFERENCES:
patent: 3881945 (1975-05-01), Trojer et al.
patent: 4698318 (1987-10-01), Vogel et al.

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