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US 8,075,996 B2Granted
Ceramic sintered compact and piezoelectric element
AssigneeHitachi Metals, Ltd.
InventorGenei Nakajima
Life of this patent
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Abstract
A ceramics sintered compact is provided in which a relative dielectric constant and an electromechanical coupling coefficient are improved in superior balance and which shows a relatively high piezoelectric coefficient. A ceramics sintered compact having a perovskite structure is provided in which a (002)/(200) ratio by X-ray diffraction after polarization is applied is 1.0 or greater.
Claims5
A polarized ceramics sintered compact having a tetragonal perovskite structure, wherein the sintered compact has:
- a (002) full width at half maximum by X-ray diffraction that is equal to or greater than 0.12 degrees;
- a (002)/(200) ratio by X-ray diffraction that is equal to or greater than 1.0;
- a relative density, obtained by dividing an actual density by a theoretical density of the sintered compact, that is from 97% to 100%;
- and
- an average crystal particle size of from 1 μm to 10 μm.
2 more elements
Dependencies are inferred from the claim text.