Method of making porous ceramics of a Pb (Zr.sub.x Ti.sub.1-x) O

Details Method of making porous ceramics of a Pb (Zr.sub.x Ti.sub.1-x) O Method of making porous ceramics of a Pb (Zr.sub.x Ti.sub.1-x) O

1997-05-21

1999-09-28

Jones, Deborah

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501 12, 252 629PZ, C04B 3549

Patent

active

059588152

ABSTRACT:
A method of making porous ceramics of lead titanate (PT) or lead zirconate PZT) of a Pb(Zr.sub.x Ti.sub.1-x) O.sub.3 compound from a gel made by mixing at least 2.5 equivalents of water based on the compound with a solution prepared from a polar solvent having complexing and chelating properties, one or more Pb(II) and PB(IV) carboxylates and at least one compound including titanium and zirconium of the general formula M(OR).sub.4 where M is titanium or zirconium and R is similar or different groups representing at least one of a straight chain, cross-linked and cyclic alkyl and alkenyl group with 1 to 10 carbon atoms, aging the resulting gel beyond its gel point, replacing the solvent in the pores of the gel by a chelating solvent, drying the resulting gel under supercritical conditions and tempering the resulting aerogel.

REFERENCES:
patent: 5143636 (1992-09-01), Gaucher et al.
patent: 5443746 (1995-08-01), Harris et al.

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