Title:
PIEZOELECTRIC/DIELECTRIC CERAMIC, PIEZOELECTRIC ELEMENT AND SOUNDER
Document Type and Number:
WIPO Patent Application WO/2023/112661
Kind Code:
A1
Abstract:
A piezoelectric/dielectric ceramic according to one aspect of the present invention is composed of crystal grains which are mainly composed of an alkali niobate salt having a perovskite structure and contain at least one alkaline earth metal element that is selected from among calcium and barium; and at least one of the crystal grains has a higher ratio of the total number of moles of calcium and barium contained therein to the number of moles of niobium contained therein at a position where the distance from the surface toward the central part is equal to 5% of the diameter of the grain than in the central part.
Inventors:
HATANO KEIICHI (JP)
TSUKAGOSHI KOICHI (JP)
HAMADA HIROSHI (JP)
ISHII SHIGEO (JP)
TSUKAGOSHI KOICHI (JP)
HAMADA HIROSHI (JP)
ISHII SHIGEO (JP)
Application Number:
PCT/JP2022/043943
Publication Date:
June 22, 2023
Filing Date:
November 29, 2022
Export Citation:
Assignee:
TAIYO YUDEN KK (JP)
International Classes:
H10N30/853; C04B35/495; H10N30/20; H10N30/50
Domestic Patent References:
| WO2012086449A1 | 2012-06-28 |
Foreign References:
| JP2016117599A | 2016-06-30 | |||
| JP2007204336A | 2007-08-16 | |||
| JP2012020918A | 2012-02-02 | |||
| JP2013035746A | 2013-02-21 | |||
| JP2017163055A | 2017-09-14 |
Attorney, Agent or Firm:
AIDA Satoru (JP)
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