Claims
- 1. A perovskite of the general formula:
- 2. The perovskite of claim 1, wherein said perovskite is doped with an element selected from the group consisting of: lanthanum, iron, manganese, niobium, tin, barium, sodium, potassium, nickel, strontium, and combinations thereof.
- 3. The perovskite of claim 1, wherein said perovskite is polycrystalline and exhibits a morphotropic phase boundary between a rhombohedral structure on the bismuth-rich side and a tetragonal structure on the lead-rich side.
- 4. The perovskite of claim 1, wherein said cation is scandium.
- 5. The perovskite of claim 4, wherein x is in the range between about 0.62 to 0.66.
- 6. The perovskite of claim 5, wherein said perovskite has a piezoelectric coefficient about 450 pC/N and a Curie temperature greater than about 450° C.
- 7. The perovskite of claim 5, wherein said perovskite has a polarization greater than about 30 μC/cm2.
- 8. The perovskite of claim 7, wherein said perovskite is exposed to an electric field greater than about 18 kV/cm, thereby attaining said polarization.
- 9. The perovskite of claim 5, wherein said perovskite has a tolerance factor less than about 0.91 and a strain limit greater than about 1.0.
- 10. The perovskite of claim 1, wherein said cation is indium.
- 11. The perovskite of claim 10, wherein said perovskite has a Curie temperature (TC) greater than about 560° C.
- 12. The perovskite of claim 10, wherein said perovskite has a tolerance factor less than about 0.885 and a strain limit greater than about 1.05.
- 13. The perovskite of claim 1, wherein said cation is ytterbium.
- 14. The perovskite of claim 13, wherein said perovskite has a Curie temperature (TC) greater than about 600° C.
- 15. The perovskite of claim 13, wherein said perovskite has a tolerance factor less than about 0.86 and a strain limit greater than about 1.1.
Government Interests
[0001] This invention was made with government support under the grant N00014-98-1-0527 from the Defense Advanced Research Projects Agency, Office of Naval Research. Accordingly, the U.S. Government has certain rights in the invention.