Sol-gel preparation of lead magnesium niobate (PMN) powders and thin films
AssigneeSandia Corporation
InventorTimothy J. Boyle
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Abstract
A method of preparing a lead magnesium niobium oxide (PMN), Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3, precursor solution by a solvent method wherein a liquid solution of a lead-complex PMN precursor is combined with a liquid solution of a niobium-complex PMN precursor, the combined lead- and niobium-complex liquid solutions are reacted with a magnesium-alkyl solution, forming a PMN precursor solution and a lead-based precipitate, and the precipitate is separated from the reacted liquid PMN precursor solution to form a precipitate-free PMN precursor solution. This precursor solution can be processed to form both ferroelectric powders and thin films.
Claims20
A method of preparing a lead magnesium niobium oxide (PMN), Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3, precursor solution by a solvent method, comprising the steps of:
- (a) combining a liquid solution of a lead-complex PMN precursor with a liquid solution of a niobium-complex PMN precursor;
- (b) reacting the combined lead- and niobium-complex liquid solutions with a magnesium-alkyl solution, forming a PMN precursor solution and a lead-based precipitate;
- and
- (c) separating said precipitate from the reacted liquid PMN precursor solution, forming a precipitate-free PMN precursor solution.
A method of preparing the lead magnesium niobium oxide (PMN), Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3, powder by a solvent method, comprising the steps of:
- (a) combining a liquid solution of a lead-complex PMN precursor with a liquid solution of a niobium-complex PMN precursor;
- (b) reacting the combined lead- and niobium-complex liquid solutions with a magnesium-alkyl solution, forming a PMN precursor solution and a lead-based precipitate;
- (c) separating said precipitate from the reacted liquid PMN precursor solution, forming a precipitate-free PMN precursor solution;
- (d) removing the volatiles of the PMN precursor solution under vacuum of about 10.sup.-3 Torr to produce a PMN precursor powder;
- and
- (e) sintering the PMN precursor powder in a furnace under ambient atmosphere by heating from room temperature to about 650.degree. C. at a rate of about 25.degree. C./min, holding at about 650.degree. C. for about 30 min, and allowing the powder to furnace cool to produce the PMN ferroelectric powder.
A method of preparing the lead magnesium niobium oxide (PMN), Pb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3, thin film by a solvent method, comprising the steps of:
- (a) combining a liquid solution of a lead-complex PMN precursor with a liquid solution of a niobium-complex PMN precursor;
- (b) reacting the combined lead- and niobium-complex liquid solutions with a magnesium-alkyl solution, forming a PMN precursor solution and a lead-based precipitate;
- (c) separating said precipitate from the reacted liquid PMN precursor solution, forming a precipitate-free PMN precursor solution;
- (d) forming a PMN precursor thin film by spin-cast deposition in air of the precursor solution at about 3000 rpm for about 10 s through a filter with pore size of about 0.1 .mu.m;
- and
- (e) sintering the PMN precursor thin film in a furnace under ambient atmosphere by heating from room temperature to about 650.degree. C. at a rate of about 25.degree. C./min, holding at about 650.degree. C. for about 30 min, and allowing the thin film to furnace cool to produce the PMN ferroelectric thin film.
Dependencies are inferred from the claim text.