JP2020007224A - 向上した共鳴周波数を有する改良z型六方晶フェライト材料 - Google Patents
向上した共鳴周波数を有する改良z型六方晶フェライト材料 Download PDFInfo
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- JP2020007224A JP2020007224A JP2019182182A JP2019182182A JP2020007224A JP 2020007224 A JP2020007224 A JP 2020007224A JP 2019182182 A JP2019182182 A JP 2019182182A JP 2019182182 A JP2019182182 A JP 2019182182A JP 2020007224 A JP2020007224 A JP 2020007224A
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- Prior art keywords
- hexagonal ferrite
- resonance frequency
- material composition
- frequency
- replaced
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- 239000000463 material Substances 0.000 title claims abstract description 149
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 84
- 150000002500 ions Chemical class 0.000 claims abstract description 14
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical class [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 10
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical class [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 7
- 239000011591 potassium Chemical class 0.000 claims abstract description 7
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical class [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 64
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 61
- 239000000203 mixture Substances 0.000 claims description 37
- 239000002245 particle Substances 0.000 claims description 26
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical group [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 18
- 229910052788 barium Inorganic materials 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000002243 precursor Substances 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000003801 milling Methods 0.000 claims description 12
- 238000005245 sintering Methods 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical group [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 8
- 230000001965 increasing effect Effects 0.000 claims description 7
- 229910052738 indium Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- 239000011363 dried mixture Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 3
- 229910021644 lanthanide ion Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 230000005291 magnetic effect Effects 0.000 abstract description 39
- 230000035699 permeability Effects 0.000 abstract description 36
- 239000013078 crystal Substances 0.000 abstract description 13
- 238000006467 substitution reaction Methods 0.000 abstract description 12
- 239000000843 powder Substances 0.000 description 18
- 238000012545 processing Methods 0.000 description 12
- 239000003989 dielectric material Substances 0.000 description 10
- 238000001453 impedance spectrum Methods 0.000 description 8
- 229910052783 alkali metal Inorganic materials 0.000 description 7
- 150000001340 alkali metals Chemical class 0.000 description 7
- 238000007654 immersion Methods 0.000 description 7
- 238000010304 firing Methods 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010316 high energy milling Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910020599 Co 3 O 4 Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- DROIAQNRBCUCDS-UHFFFAOYSA-N barium cobalt Chemical compound [Co][Ba] DROIAQNRBCUCDS-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005350 ferromagnetic resonance Effects 0.000 description 2
- 238000001566 impedance spectroscopy Methods 0.000 description 2
- -1 potassium (K) Chemical class 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000012254 powdered material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241000580063 Ipomopsis rubra Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011874 heated mixture Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000003826 uniaxial pressing Methods 0.000 description 1
Classifications
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- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders
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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
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- 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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- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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Abstract
Description
本出願は、「z型六方晶フェライト材料」と題された、2014年9月30日に出願された米国仮出願番号第62/057,827号の利益を主張し、その全体が引用により本明細書に援用される。
み得る。六方晶フェライトは、マグネトプラムバイトセルを主体とするさまざまな異なる結晶構造に形成され得る。これらの構造には、M相(BaFe12O19)、W相(BaMe2Fe16O27)、Y相(Ba2Me2Fe12O22)およびZ相(Ba3Me2Fe24O42)が含まれる。本明細書ではz相六方晶フェライトが記載されるが、開示される方法論は、その他の相にも援用され得ることが理解されるであろう。
方法および処理技術を提供する。
(式中、deff/d0は小型化率であり、εrはアンテナ材料の誘電率であり、μrはアンテナ材料の透磁率である。εrおよびμrはともに磁性酸化物アンテナにおける周波数に依存する。)
次に、有効帯域幅(または効率)は、以下の式によって定められる。
(式中、η/η0は材料の効率(または帯域幅)を示す。)
この効率は、μrが最大化されると最大化される。さらに、μr=εrである場合、自由空間に対する完全なインピーダンス整合が存在する。したがって、小型化率は、ある周波数における透磁率および誘電率の積の平方根に比例する。したがって、無線周波数放射との磁気相互作用を利用して、Co2Z部品などの誘電体部品とともにアンテナを小型化することができる。さらに、材料が絶縁性となり、誘電率および透磁率ができるかぎり互いに近づくことにより、インピーダンス不整合および反射損失を極力抑えるのに有利となり得る。
上記のように、小型化アンテナシステムにおいて使用されるCo2Zなどの誘電材料の共鳴周波数を増加させることが有利となり得る。特に、500MHz、700MHz、900MHz、または1GHzを超える周波数における動作は、最小限の/許容できる信号損失を有するとともに、該材料を用いてより多くの信号が使用可能となるため、より広い
信号の使用可能範囲が得られる。これは特に、商業的にも軍事的にも使用される高マイクロ波周波数用途に有用となり得る。以下に開示される材料の実施形態は、少なくとも一部はCo2Z結晶格子構造内の特定の原子の置換により、このように高い動作周波数を達成可能である。さらに、開示されるCo2Z材料の実施形態は、かなり低い損失を有し得る。
r、Ga、Co、Ni、Fe、Yb、またはランタニドイオンのいずれかが含まれ得て、0<x≦0.5である。いくつかの実施形態では、z型ヘキサフェライトは、上記の式を用いて合成され得る。たとえば、向上したz型六方晶フェライトは、M(III)がSc、Co、Mn、Cr、In、およびYbであり、x=0.5であるときに合成され得る。
ともに行なわれ得ることである。しかし、いくつかの実施形態では、Baを二価イオンに
置換し、Feを三価イオンに置換することによって、高共鳴周波数を維持しつつ、アルカリ添加が回避され得る。このため、材料の実施形態は、約700MHz、約900MHz、約1GHzまたは約700MHz、約900MHz、もしくは約1GHzを超える周波数範囲内で使用可能である。
図4は、いくつかの実施形態に係るCo2Z材料を形成する方法100を示す。図4に
示されるように、適量の前駆材料、すなわち、磁気材料を形成可能なバリウム、コバルト、鉄、1つ以上のアルカリ金属、および酸素を与え得る反応物質がステップ102でともに混合される。いくつかの実施形態では、酸素の少なくとも一部が、バリウム(Ba)、コバルト(Co)、鉄(Fe)、または1つ以上のアルカリ金属の酸素含有化合物の形態で提供されてもよい。たとえば、これらの元素は、炭酸塩もしくは酸化物の形態で、または当該技術分野で知られている他の酸素含有前駆体の形態で提供されてもよい。いくつかの実施形態では、1つ以上の前駆材料は、非酸素含有化合物または純粋な元素の形態で提供されてもよい。いくつかの実施形態では、酸素は、たとえばH2O2などの別個の化合物から、またはガス状酸素または空気から供給されてもよい。たとえば、いくつかの実施形態では、BaCO3、Co3O4、およびFe2O3前駆体は、約0.06重量%〜約3.6重量%のK2CO3とともに、Co2Zの形成に適切な比(たとえば、約22重量%BaCO3、約6重量%Co3O4、および約72重量%Fe2O3)で混合される。これらの前駆化合物は、たとえばコーレスミキサ、ボールミル、または振動ミルを用いて水またはアルコール中で混合または配合されてもよい。これらの前駆体は、乾式で配合されてもよい。
9ミクロンの微粒子径まで粉砕するために、高エネルギーミリングが使用される。この粒子径は、たとえば沈降法粒度分布測定装置(sedigraph)またはレーザ散乱技術を用いて
測定され得る。目標中央粒径は、後のステップにおいて焼結を容易にするために、粒子の十分な表面面積を与えるように選択され得る。より小さい中央直径を有する粒子は、より大きい粒子よりも反応性が高く、より容易に焼結され得る。いくつかの実施形態では、ステップ102ではなくこの時点で、またはステップ102に加えてこの時点で、1つ以上のアルカリ金属またはアルカリ金属前駆体または他のドーパント材料を添加してもよい。いくつかの実施形態では、アルカリ金属が使用されない。
約5.36g/cm3であり得る。ドープドヘキサフェライトの所望の透磁率は、所望の
粒径を有する結晶粒を生成するために材料の熱処理を調整することによって達成され得る。プレスされ、さらに焼結されたヘキサフェライトは、ステップ116において破砕され、最終ヘキサフェライト生成物が形成されてもよい。
サフェライト群のメンバーであってもよい。
態に係るテクスチャリングされた(textured)Co2Zを形成する方法200を示す。方法200は、微粒子六方晶フェライト粉末が形成されるステップ202から始まる。ある実現例では、微粒子六方晶フェライト粉末は、本明細書に記載されるものなどの置換バリウムコバルトフェライトz相(Co2Z)粉末である。Co2Z粉末は、共沈殿など、当該技術分野で知られる化学プロセスを用いて合成され得る。Co2Zは、ネッチ(Netzsch)社製ゼータミルなどを用いたゾル−ゲル、仮焼、および機械的粉砕を介しても合成さ
れ得る。いくつかの実施形態では、Co2Z粉末は、約1ミクロン未満の粒径および約6m2/gを超える表面積を有する。いくつかの実施形態では、Co2Z粉末は、約1ミクロン未満の平均粒径および約6m2/gを超える平均表面積を有する。いくつかの実施形態では、Co2Z粉末は、300〜600nmの中央粒径および約15m2/gを超える表面積を有する。用途に依存して、六方晶フェライト粉末は、Y、W、U、X、またはM相六方晶フェライト材料もさらに含み得ることが認識されるであろう。
係る。いくつかの実施形態では、Co2Zを形成する際に使用される磁気テクスチャリングの方法は、反応焼結方法を使用することに係り、該方法は、静磁界下でM相(BaFe12O19 一軸磁化)を非磁性添加物により配向させるステップと、BaO源およびCoOと反応させて、z相(Ba3Me2Fe24O42)を形成するステップとを含む。いくつかの実施形態では、Co2Zを形成する際に使用される磁気テクスチャリングの方法は、回転磁界方法を使用することに係り、この方法は、Co2Z相(平面磁化)を回転磁界下で起きる磁気テクスチャリングにより配向させるステップを含む。発明者は、配向の度合い、ひいては透磁率ゲインが回転磁界下ではるかに優れていることを見出した。
末をゼータミリングし、焼成することで、該材料の共鳴周波数が増加することが証明される。さらに、図7および図8を比較すると、焼成温度を1140℃から1100℃に下げることによって、該材料の共鳴周波数のさらなる増加が得られることがわかる。このような共鳴周波数の増加は、ゼータミリングされ、低温焼成されたCo2ZからなるRF装置部品が、ゼータミリングされず、高温焼成されたCo2Zからなる同様の装置または装置部品よりも高い周波数範囲または広い周波数範囲内で透磁率を保持し、動作可能であり得ることを示している。
上に開示された誘電材料の実施形態、および製造方法は、さまざまな無線周波数装置の製造に使用可能である。これらの装置には、限定されないが、フィルタ、アイソレータ、サーキュレータ、共振器、携帯電話部品、ラップトップ部品、個人用携帯情報端末部品、タブレット部品、または基地局部品が含まれる。さらに、開示された誘電材料は、Bluetooth(登録商標)信号などの携帯または無線周波数信号に関連する部品において使用可能
である。いくつかの実施形態では、開示された誘電材料は、高周波数アンテナなどのアンテナに使用可能である。開示された誘電材料の実施形態が組込まれる装置のタイプは、限定されないが、以下にいくつかの例を示す。
化され得ることが理解されるべきである。さらに、他の実現例が本開示の範囲内である。
Claims (20)
- 一部のバリウム原子がストロンチウム原子に置換され、一部の鉄原子がアルミニウム原子に置換された、向上したz型六方晶フェライトを含み、前記向上したz型六方晶フェライトは、式Ba3−xSrxCo2Fe24−yAlyO41を有し、約500MHzを超える共鳴周波数を有する、高共鳴周波数材料組成物。
- 0<x<1.5、0<y<0.9である、請求項1に記載の高共鳴周波数材料組成物。
- x=1.5、y=0.9である、請求項2に記載の高共鳴周波数材料組成物。
- x=1.5、y=0.3である、請求項2に記載の高共鳴周波数材料組成物。
- 前記向上したz型六方晶フェライトは、1GHzを超える共鳴周波数を有する、請求項1に記載の高共鳴周波数材料組成物。
- 請求項1に記載の前記高共鳴周波数材料組成物を含む、無線周波数装置。
- 請求項1に記載の前記高共鳴周波数材料組成物を含む、高周波数アンテナ。
- 有利なマイクロ波特性を有する材料組成物であって、前記材料組成物は、
バリウム原子の一部がカリウム原子に置換され、コバルト原子の一部が三価イオンに置換された、向上したz型六方晶フェライトを含み、前記向上したz型六方晶フェライトは、式Ba3−xKxCo2−xM(III) xFe24O41(式中、M(III)は三価イ
オンである。)を有する、材料組成物。 - M(III)は、Sc、Mn、In、Cr、Ga、Co、Ni、Fe、Yb、または任意のランタニドイオンからなる群から選択される、請求項8に記載の材料組成物。
- 0<x<0.5である、請求項8に記載の材料組成物。
- M(III)は、Co、Mn、Cr、In、またはYbであり、x=0.5である、請求項8に記載の材料組成物。
- 前記材料は、1GHzを超える共鳴周波数を有する、請求項8に記載の材料組成物。
- 請求項8の前記材料組成物を含む、高周波数アンテナ。
- 六方晶フェライト材料の共鳴周波数を増加させる方法であって、
バリウム、コバルト、鉄、および酸素を含む前駆材料の混合物を配合するステップであって、前記前駆材料中のバリウムの少なくとも一部はストロンチウムに置換えられ、および前記前駆材料中のアルミニウムの少なくとも一部は鉄に置換えられているか、または前記バリウムの少なくとも一部はカリウムにより置換えられているステップと、
前記混合物を乾燥させるステップと、
前記乾燥された混合物を加熱するステップと、
前記乾燥された混合物を粉砕して粒子のブレンドを形成するステップと、
前記粒子を乾燥させるステップと、
前記乾燥された粒子をプレス成形するステップと、
前記プレス成形された粒子を焼結して、500MHzを超える共鳴周波数を有する六方晶フェライト材料を形成するステップとを含む、方法。 - アルカリ添加が使用されない、請求項14に記載の方法。
- 前記六方晶フェライト材料は、Ba3−xSrxCo2Fe24−yAlyO41(式中、xは0〜1.5であり、yは0〜0.9である。)である、請求項14に記載の方法。
- 前記六方晶フェライト材料は、Ba3−xKxCo2−xM(III) xFe24O41(式中、M(III)は三価イオンであり、xは0〜0.5である。)である、請求項14に記載の方法。
- 前記六方晶フェライト材料は、1GHzを超える共鳴周波数を有する、請求項14に記載の方法。
- 前記六方晶フェライト材料から無線周波数装置を形成するステップをさらに含む、請求項14に記載の方法。
- 前記六方晶フェライト材料から高周波数アンテナを形成するステップをさらに含む、請求項14に記載の方法。
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