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Particles of magnetoplumbite-type hexagonal ferrite, method for manufacturing the same, and radio wave absorber
US2020335247A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020335247-A1 |
| Application number | US-202016904932-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 18, 2020 |
| Priority date | Dec 27, 2017 |
| Publication date | Oct 22, 2020 |
| Grant date | — |
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- Title
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Abstract
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To provide magnetoplumbite-type hexagonal ferrite particles represented by Formula (1) and having a single crystal phase, and the application. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0. AFe (12-x) Al x O 19 Formula ( 1 )
First claim
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What is claimed is: 1 . Particles of a magnetoplumbite-type hexagonal ferrite represented by Formula (1) and having a single crystal phase, AFe (12-x) Al x O 19 Formula (1) in Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0. 2 . The particles of a magnetoplumbite-type hexagonal ferrite according to claim 1 , wherein x in Formula (1) satisfies 1.5≤x≤6.0. 3 . The particles of a magnetoplumbite-type hexagonal ferrite according to claim 1 , wherein the magnetoplumbite-type hexagonal ferrite particles are used for a radio wave absorber. 4 . A method for producing the particles of a magnetoplumbite-type hexagonal ferrite according to claim 1 , the method comprising: a step A of obtaining a precipitate containing Fe, Al, and the at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb by a liquid phase method; and a step B of firing the precipitate obtained in the step A. 5 . The method for producing the particles of a magnetoplumbite-type hexagonal ferrite according to claim 4 , wherein the step A includes a step of mixing an aqueous solution containing an Fe salt, an Al salt, and a salt of the at least one metal element with an alkali aqueous solution to obtain a reaction product. 6 . A radio wave absorber having a planar shape, comprising: the particles of a magnetoplumbite-type hexagonal ferrite according to claim 1 ; and a binder. 7 . A radio wave absorber having a three-dimensional shape, comprising: the particles of a magnetoplumbite-type hexagonal ferrite according to claim 1 ; and a binder.
Assignees
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Classifications
Magnetic properties · CPC title
by a space-group or by other symmetry indications · CPC title
Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title
Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title
Strontium oxides or oxide-forming salts thereof · CPC title
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- What does patent US2020335247A1 cover?
- To provide magnetoplumbite-type hexagonal ferrite particles represented by Formula (1) and having a single crystal phase, and the application. In Formula (1), A represents at least one metal element selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.5≤x≤8.0. AFe (12-x) Al x O 19 Formula ( 1 )
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F27/366. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Oct 22 2020 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).