Electret
US-2021184100-A1 · Jun 17, 2021 · US
Electret
US11558694B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11558694-B2 |
| Application number | US-202017116217-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 9, 2020 |
| Priority date | Dec 13, 2019 |
| Publication date | Jan 17, 2023 |
| Grant date | Jan 17, 2023 |
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- Title
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Abstract
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An electret includes a composite oxide having an ABO 3 type perovskite structure containing two different metal elements A and B. The composite oxide is in a polarized state, at least a part of one of the metal elements A and B is substituted with a dopant element having a lower valence than the one of the metal elements A and B, and the composite oxide has a bandgap energy of 4 eV or more.
First claim
Opening claim text (preview).
What is claimed is: 1. An electret comprising a composite oxide having an ABO 3 type perovskite structure containing two different metal elements A and B, wherein the composite oxide is in a polarized state, at least a part of one of the metal elements A and B is substituted with a dopant element having a lower valence than the one of the metal elements A and B, and the composite oxide has a bandgap energy of 4 eV or more. 2. The electret according to claim 1 , wherein the metal element A occupying an A site of the perovskite structure is a rare earth element R selected from the group consisting of La, Y, Pr, Sm and Nd, and the metal element B occupying a B site is Al. 3. The electret according to claim 1 , wherein the dopant element that substitutes for the metal element A is an alkaline earth metal element, and the dopant element that substitutes for the metal element B is one or more elements selected from the group consisting of alkaline earth metal elements and Zn. 4. The electret according to claim 3 , wherein the alkaline earth metal element is Ca or Sr. 5. The electret according to claim 3 , wherein a substitution ratio of the dopant element that substitutes for the metal element A is 20 atomic % or less, and the substitution ratio of the dopant element that substitutes for the metal element B is 20 atomic % or less. 6. The electret according to claim 3 , wherein a substitution ratio of the dopant element that substitutes for the metal element A is 0.05 atomic % to 18.8 atomic %, and a substitution ratio of the dopant element that substitutes for the metal element B is 0.05 atomic % to 18.8 atomic %. 7. The electret according to claim 3 , wherein a substitution ratio of the dopant element that substitutes for the metal element A is 0.05 atomic % to 2.5 atomic %, and a substitution ratio of the dopant element that substitutes for the metal element B is 0.05 atomic % to 2.5 atomic %.
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- What does patent US11558694B2 cover?
- An electret includes a composite oxide having an ABO 3 type perovskite structure containing two different metal elements A and B. The composite oxide is in a polarized state, at least a part of one of the metal elements A and B is substituted with a dopant element having a lower valence than the one of the metal elements A and B, and the composite oxide has a bandgap energy of 4 eV or more.
- Who is the assignee on this patent?
- Denso Corp, Univ Tokyo Science Found
- What technology area does this patent fall under?
- Primary CPC classification H01G7/026. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 17 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).