US 12,232,423 B2
Piezoelectric ceramic composition
Takeshi Hirayama, Kirishima (JP); Shuhei Tabata, Kirishima (JP); and Gen Shimura, Kirishima (JP)
Assigned to KYOCERA CORPORATION, Kyoto (JP)
Appl. No. 17/438,402
Filed by KYOCERA CORPORATION, Kyoto (JP)
PCT Filed Mar. 2, 2020, PCT No. PCT/JP2020/008601
§ 371(c)(1), (2) Date Sep. 10, 2021,
PCT Pub. No. WO2020/184242, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019-046104 (JP), filed on Mar. 13, 2019.
Prior Publication US 2022/0158076 A1, May 19, 2022
Int. Cl. H10N 30/853 (2023.01); B41J 2/14 (2006.01); C01G 33/00 (2006.01); C01G 35/00 (2006.01)
CPC H10N 30/8542 (2023.02) [C01G 33/006 (2013.01); C01G 35/006 (2013.01); B41J 2/14201 (2013.01); C01P 2002/52 (2013.01); C01P 2002/60 (2013.01); C01P 2006/40 (2013.01)] 14 Claims
OG exemplary drawing
 
3. A piezoelectric ceramic composition represented by a composition formula AxBO3, the piezoelectric ceramic composition comprising:
potassium sodium niobate containing K and Na that account for 80% or more of an amount of A-site elements and containing Nb that accounts for 70% or more of an amount of B-site elements,
wherein the piezoelectric ceramic composition comprises Ta and Fe at a B-site,
wherein the piezoelectric ceramic composition comprises a Ta segregation part in which Ta is unevenly distributed, and
wherein a ratio of an amount of Fe element to an amount of all elements in the Ta segregation part is larger than a ratio of an amount of Fe element to an amount of all elements in a reference part having at least a portion different from the Ta segregation part.