WO2012103020A3 - Specialty materials processing techniques for enhanced resonant frequency hexaferrite materials for antenna applications and other electronic devices - Google Patents

Specialty materials processing techniques for enhanced resonant frequency hexaferrite materials for antenna applications and other electronic devices Download PDF

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Publication number
WO2012103020A3
WO2012103020A3 PCT/US2012/022241 US2012022241W WO2012103020A3 WO 2012103020 A3 WO2012103020 A3 WO 2012103020A3 US 2012022241 W US2012022241 W US 2012022241W WO 2012103020 A3 WO2012103020 A3 WO 2012103020A3
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WIPO (PCT)
Prior art keywords
processing techniques
phase
materials
resonant frequency
magnetic
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Application number
PCT/US2012/022241
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French (fr)
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WO2012103020A2 (en
Inventor
Michael D. Hill
Original Assignee
Skyworks Solutions, Inc.
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Publication date
Application filed by Skyworks Solutions, Inc. filed Critical Skyworks Solutions, Inc.
Publication of WO2012103020A2 publication Critical patent/WO2012103020A2/en
Publication of WO2012103020A3 publication Critical patent/WO2012103020A3/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/0018—Mixed oxides or hydroxides
    • C—CHEMISTRY; METALLURGY
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    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
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    • C01G49/0018—Mixed oxides or hydroxides
    • C01G49/0036—Mixed oxides or hydroxides containing one alkaline earth metal, magnesium or lead
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
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    • H01F1/342—Oxides
    • H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
    • H01F1/348—Hexaferrites with decreased hardness or anisotropy, i.e. with increased permeability in the microwave (GHz) range, e.g. having a hexagonal crystallographic structure
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Abstract

Processing techniques for forming a textured hexagonal ferrite materials such as Z-phase barium cobalt ferrite Ba3Co2Fe24O41 (Co2Z) to enhance the resonant frequency and other magnetic properties of the material for high frequency applications are provided. The processing techniques include magnetic texturing by using fine grain particles and sintering the material at a lower temperature than conventional firing temperatures to inhibit reduction of iron. The processing techniques also may include aligning M-phase (BaFe12O19 uniaxial magnetization) with non-magnetic additives in a static magnetic field and reacting with BaO source and CoO to form Z-phase (Ba3Me2Fe24O42). In some implementations, processing techniques includes aligning Co2Z phase (planar magnetization) with magnetic texturing occurring in a rotating magnetic field.
PCT/US2012/022241 2011-01-24 2012-01-23 Specialty materials processing techniques for enhanced resonant frequency hexaferrite materials for antenna applications and other electronic devices WO2012103020A2 (en)

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US11783975B2 (en) 2019-10-17 2023-10-10 Rogers Corporation Nanocrystalline cobalt doped nickel ferrite particles, method of manufacture, and uses thereof
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CN115974542B (en) * 2023-01-12 2023-11-21 中国科学院赣江创新研究院 Praseodymium-doped strontium ferrite wave-absorbing material and preparation method thereof

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