Method for the mechanochemical preparation of high performance ceramics
AssigneeAlliedSignal Inc.
InventorsChangxing Cui, Ji Su, Ray H. Baughman
Life of this patent
Estimating the term…
Abstract
Disclosed are mechanochemical processes for the synthesis of high performance electroceramics from organometallic precursors, and compositions resulting from the processes.
Claims31
A ferroelectric ceramic powder of substantially single-phase orthorhombic lead metaniobate made by a process comprising the steps of:
- (a) mechanically grinding together two or more precursor components, at least one of which is an organometallic compound containing a metallic element of said ceramic, so that a polymerization or oligomerization reaction of said organometallic compound occurs, and
- (b) thermally treating the reaction product of said mechanical grinding so that the ceramic powder is produced,
- wherein the ceramic powder contains essentially no chlorine.
A ferroelectric ceramic powder of lead magnesium niobate which contains greater than 98% perovskite lead magnesium niobate and less than 1% pyrochlore phase made by a process comprising the steps of:
- (a) mechanically grinding together two or more precursor components, at least one of which is an organometallic compound containing a metallic element of said ceramic, so that a polymerization or oligomerization reaction of said organometallic compound occurs, and
- (b) thermally treating the reaction product of said mechanical grinding so that a ceramic powder is produced;
- wherein the ceramic powder contains metals selected from the group consisting of lead, magnesium and niobium;
- and
- wherein the ceramic powder contains essentially no chlorine.
A ferroelectric ceramic powder of lead magnesium niobate which contains greater than 98% perovskite lead magnesium niobate made by a process comprising the steps of:
- (a) mechanically grinding together two or more precursor components, at least one of which is an organometallic compound containing a metallic element of said ceramic, so that a polymerization or oligomerization reaction of said organometallic compound occurs, and
- (b) thermally treating the reaction product of said mechanical grinding so that a ceramic powder is produced;
- wherein the ceramic powder contains metals selected from the group consisting of lead, magnesium and niobium;
- and
- wherein the ceramic powder contains essentially no chlorine;
- and
- wherein the ceramic powder of lead magnesium niobate contains above 99% perovskite lead magnesium niobate.
Dependencies are inferred from the claim text.