The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 2021
Filed:
Mar. 07, 2018
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 41/08 (2006.01); H01L 41/43 (2013.01); H01L 41/047 (2006.01); H01L 41/187 (2006.01); H01L 41/37 (2013.01); C04B 35/628 (2006.01); C04B 35/26 (2006.01); C04B 35/468 (2006.01); C01G 49/00 (2006.01); C01G 23/00 (2006.01);
U.S. Cl.
CPC ...
H01L 41/08 (2013.01); C01G 23/006 (2013.01); C01G 49/0018 (2013.01); C04B 35/26 (2013.01); C04B 35/4682 (2013.01); C04B 35/62805 (2013.01); C04B 35/62826 (2013.01); H01L 41/0477 (2013.01); H01L 41/1871 (2013.01); H01L 41/1878 (2013.01); H01L 41/37 (2013.01); H01L 41/43 (2013.01); C01P 2002/34 (2013.01); C01P 2004/84 (2013.01); C04B 2235/3215 (2013.01); C04B 2235/3232 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3298 (2013.01); C04B 2235/768 (2013.01); C04B 2235/80 (2013.01); C04B 2235/85 (2013.01);
Abstract
A piezoelectric composition comprises a plurality of crystal particles, wherein the piezoelectric composition includes bismuth, iron, barium, titanium, and oxygen; the crystal particle include a core and a shell having a contents of bismuth higher than that in the core and covering the core; and the total area of the cross sections of the cores exposed to the cross section of the piezoelectric composition is expressed as S, the total area of the cross sections of the shells exposed to the cross section of the piezoelectric composition is expressed as S, and 100·S/(S+S) is 50 to 90.