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:
Oct. 20, 2020
Filed:
Mar. 07, 2018
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 41/187 (2006.01); C04B 35/628 (2006.01); C04B 35/26 (2006.01); C04B 35/468 (2006.01); C04B 35/475 (2006.01); C04B 35/626 (2006.01); C04B 35/64 (2006.01); H01L 41/43 (2013.01);
U.S. Cl.
CPC ...
H01L 41/1871 (2013.01); C04B 35/26 (2013.01); C04B 35/4682 (2013.01); C04B 35/475 (2013.01); C04B 35/6262 (2013.01); C04B 35/6264 (2013.01); C04B 35/62655 (2013.01); C04B 35/62826 (2013.01); C04B 35/62886 (2013.01); C04B 35/62897 (2013.01); C04B 35/64 (2013.01); H01L 41/1878 (2013.01); H01L 41/43 (2013.01); C04B 2235/3215 (2013.01); C04B 2235/3236 (2013.01); C04B 2235/3274 (2013.01); C04B 2235/3298 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/6567 (2013.01); C04B 2235/75 (2013.01); C04B 2235/768 (2013.01); C04B 2235/78 (2013.01); C04B 2235/80 (2013.01); C04B 2235/96 (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 particles include a core and a shell covering the core; the average value of the contents of bismuth in the cores is expressed as C% by mass, the average value of the contents of bismuth in the shells is expressed as C% by mass, and the Cis lower than the C; and the number of all the particles comprised in the piezoelectric composition is expressed as N, the number of the crystal particles including the core and the shell is expressed as n, and n/N is 0.10 to 1.00.