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US 12,738,665 B2Granted
Radio wave absorber and radio wave absorbing composition
AssigneeFUJIFILM Corporation
InventorHirokazu Hashimoto
Life of this patent
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Abstract
A radio wave absorber including a magnetic powder and a binder, in which the magnetic powder is a powder of a hexagonal ferrite in which a ratio (σs/β) of a saturation magnetization as to a half-width β of a diffraction peak on a (107) plane is 240 emu·g−1·degree−1 or more, where the half-width β is determined by X-ray diffraction analysis.
Claims13
A radio wave absorber comprising:
- a magnetic powder;
- and
- a binder,
- wherein the magnetic powder is a powder of a hexagonal ferrite in which a ratio of a saturation magnetization σs to a half-width β of a diffraction peak on a (107) plane, σs/β, is 240 emu·g−1·degree−1 or more, where the half-width β is determined by X-ray diffraction analysis,
- wherein the hexagonal ferrite is a substitution-type hexagonal ferrite,
- wherein the saturation magnetization σs is 65.0 emu/g or less and 42.0 emu/g or more,
- wherein the substitution-type hexagonal ferrite has a composition represented by Formula 1,
- A1Fe(12-x)AlxO19 Formula 1:
- in Formula 1, A1 represents one or more kinds of atoms selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.50≤x≤8.00.
6 more elements
A radio wave absorbing composition comprising:
- a magnetic powder;
- and
- a binder,
- wherein the magnetic powder is a powder of a hexagonal ferrite in which a ratio of a saturation magnetization σs to a half-width β of a diffraction peak on a (107) plane, σs/β, is 240 emu·g−1·degree−1 or more, where the half-width β is determined by X-ray diffraction analysis,
- wherein the hexagonal ferrite is a substitution-type hexagonal ferrite,
- wherein the saturation magnetization σs is 65.0 emu/g or less and 42.0 emu/g or more,
- wherein the substitution-type hexagonal ferrite has a constitution represented by Formula 1,
- A1Fe(12-x)AlxO19 Formula 1:
- in Formula 1, A1 represents one or more kinds of atoms selected from the group consisting of Sr, Ba, Ca, and Pb, and x satisfies 1.50≤x≤8.00.
6 more elements
Dependencies are inferred from the claim text.