Piezoelectric element and method to remove extraneous vibration modes
US-9224938-B2 · Dec 29, 2015 · US
Piezoelectric composition and piezoelectric device
US2018261755A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018261755-A1 |
| Application number | US-201815914203-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 7, 2018 |
| Priority date | Mar 9, 2017 |
| Publication date | Sep 13, 2018 |
| Grant date | — |
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- Title
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Abstract
Official abstract text for this publication.
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 CORE , the total area of the cross sections of the shells exposed to the cross section of the piezoelectric composition is expressed as S SHELL , and 100·S CORE /(S CORE +S SHELL ) is 50 to 90.
First claim
Opening claim text (preview).
What is claimed is: 1 . A piezoelectric composition comprising a plurality of crystal particles, wherein the piezoelectric composition includes bismuth, iron, barium, titanium, and oxygen; the crystal particle includes a core and a shell having a content of bismuth higher than that in the core and covering the core; and a total area of cross sections of the cores exposed to a cross section of the piezoelectric composition is expressed as S CORE , a total area of cross sections of the shells exposed to the cross section of the piezoelectric composition is expressed as S SHELL , and 100·S CORE /(S CORE +S SHELL ) is 50 to 90. 2 . The piezoelectric composition according to claim 1 , wherein a number of all particles comprised in the piezoelectric composition is expressed as N, a number of the crystal particles including the cores and the shells is expressed as n, and n/N is 0.10 to 1.00. 3 . The piezoelectric composition according to claim 1 , wherein the piezoelectric composition is a sintered body. 4 . A piezoelectric device comprising the piezoelectric composition according to claim 1 . 5 . The piezoelectric device according to claim 4 , wherein a piezoelectric constant d 33 of the piezoelectric composition to which an electric field of 0.1 to 2.0 kV/mm is applied is 200 pC/N or more.
Assignees
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Classifications
Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite · CPC title
Alkaline earth titanates · CPC title
Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate · CPC title
Phases present in the sintered or melt-cast ceramic products other than the main phase · CPC title
Submicron sized grains, i.e. from 0,1 to 1 micron · CPC title
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- What does patent US2018261755A1 cover?
- 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 …
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H01L41/08. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Sep 13 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).