JP2008060293A - 磁性材料 - Google Patents
磁性材料 Download PDFInfo
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- JP2008060293A JP2008060293A JP2006234958A JP2006234958A JP2008060293A JP 2008060293 A JP2008060293 A JP 2008060293A JP 2006234958 A JP2006234958 A JP 2006234958A JP 2006234958 A JP2006234958 A JP 2006234958A JP 2008060293 A JP2008060293 A JP 2008060293A
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- magnetic material
- iron oxide
- oxide phase
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- 239000000696 magnetic material Substances 0.000 title claims abstract description 48
- 239000013078 crystal Substances 0.000 claims abstract description 110
- 230000005291 magnetic effect Effects 0.000 claims abstract description 94
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000002245 particle Substances 0.000 claims abstract description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 160
- 239000006249 magnetic particle Substances 0.000 claims description 15
- 230000005415 magnetization Effects 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 230000005381 magnetic domain Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 40
- 239000000693 micelle Substances 0.000 abstract description 36
- 238000003980 solgel method Methods 0.000 abstract description 10
- 239000012071 phase Substances 0.000 description 49
- 235000013980 iron oxide Nutrition 0.000 description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 28
- 239000000203 mixture Substances 0.000 description 26
- 239000000243 solution Substances 0.000 description 25
- 239000006247 magnetic powder Substances 0.000 description 24
- 239000000843 powder Substances 0.000 description 16
- 239000000377 silicon dioxide Substances 0.000 description 14
- 238000006467 substitution reaction Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 12
- 239000012535 impurity Substances 0.000 description 12
- 235000014413 iron hydroxide Nutrition 0.000 description 12
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 12
- 238000002441 X-ray diffraction Methods 0.000 description 10
- 229910000859 α-Fe Inorganic materials 0.000 description 10
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 8
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 7
- 150000001342 alkaline earth metals Chemical class 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000002243 precursor Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 5
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000000634 powder X-ray diffraction Methods 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 150000004690 nonahydrates Chemical class 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 230000006399 behavior Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000011882 ultra-fine particle Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- SWCIQHXIXUMHKA-UHFFFAOYSA-N aluminum;trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Al+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SWCIQHXIXUMHKA-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 150000004696 coordination complex Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 241000238366 Cephalopoda Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910001420 alkaline earth metal ion Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000003937 drug carrier Substances 0.000 description 1
- 239000012776 electronic material Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- -1 silica Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/706—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material
- G11B5/70626—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances
- G11B5/70642—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the composition of the magnetic material containing non-metallic substances iron oxides
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/714—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dimension of the magnetic particles
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/04—Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
- C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
- C01P2004/84—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases one phase coated with the other
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
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- Crystallography & Structural Chemistry (AREA)
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- Compounds Of Iron (AREA)
- Magnetic Record Carriers (AREA)
Abstract
【解決手段】 ε−Fe2O3結晶と空間群が同じであり、かつε−Fe2O3結晶のFeサイトの一部がAlで置換された構造の結晶を主相にもつ鉄酸化物相を有し、その鉄酸化物相におけるAlとFeのモル比をAl:Fe=x:(2−x)と表すとき、0<x<1を満たす磁性粉体。前記xは例えば0.3〜0.7の範囲とすることができる。この粉体のTEM写真から求まる平均粒子径は5〜200nm、好ましくは10〜100nmである。この磁性粉体は、逆ミセル法とゾル−ゲル法を組み合わせた手法により製造できる。
【選択図】図1
Description
(2)この磁性材料は、鉄が3価まで酸化された鉄酸化物からなるので、従来のメタル系磁性材料と比べ、大気環境での耐食性が極めて良好である。
(3)この磁性材料は置換元素として安価なAlを使用するので、Ga等の高価な元素で置換したε−Fe2O3と比べ、大幅なコスト低減が可能である。
n−オクタンを油相とするミセル溶液Iの水相には、鉄源としての硝酸鉄(III)、鉄の一部を置換させるためのAl源としての硝酸アルミニウム(III)9水和物、および界面活性剤(例えば臭化セチルトリメチルアンモニウム)を溶かし、同じくn−オクタンを油相とするミセル溶液IIの水相にはアンモニア水溶液を用いる。その際、ミセル溶液Iの水相に適量のアルカリ土類金属(Ba、Sr、Caなど)の硝酸塩を溶解させておくことができる。この硝酸塩は形状制御剤として機能する。すなわち、アルカリ土類金属が液中に存在すると最終的にロッド形状のAl含有ε−Fe2O3結晶を得ることができる。形状制御剤がない場合は、粒状のAl含有ε−Fe2O3結晶を得ることができる。
本例は、ε−Al0.29Fe1.71O3を合成した例である。以下の手順に従った。
ミセル溶液Iとミセル溶液IIの2種類のミセル溶液を調整する。
・ミセル溶液Iの作製
テフロン(登録商標)製のフラスコに、純水6mL、n−オクタン18.3mLおよび1−ブタノール3.7mLを入れる。そこに、硝酸鉄(III)9水和物を0.00240モル、硝酸アルミニウム(III)9水和物を0.00060モルを添加し、室温で良く撹拌しながら溶解させる。さらに、界面活性剤としての臭化セチルトリメチルアンモニウムを、純水/界面活性剤のモル比が30となるような量で添加し、撹拌により溶解させ、ミセル溶液Iを得る。
このときの仕込み組成は、AlとFeのモル比をAl:Fe=x:(2−x)と表すときx=0.40である。
25%アンモニア水2mLを純水4mLに混ぜて撹拌し、その液に、さらにn―オクタン18.3mLと1−ブタノール3.7mLを加えてよく撹拌する。その溶液に、界面活性剤として臭化セチルトリメチルアンモニウムを、(純水+アンモニア中の水分)/界面活性剤のモル比が30となるような量で添加し、溶解させ、ミセル溶液IIを得る。
ミセル溶液Iをよく撹拌しながら、ミセルI溶液に対してミセル溶液IIを滴下する。滴下終了後、混合液を30分間撹拌し続ける。
手順2で得られた混合液を撹拌しながら、当該混合液にテトラエトキシシラン1.5mLを加える。約1日そのまま、撹拌し続ける。
手順3で得られた溶液を遠心分離機にセットして遠心分離処理する。この処理で得られた沈殿物を回収する。回収された沈殿物をクロロホルムとメタノールの混合溶液を用いて複数回洗浄する。
手順4で得られた沈殿物を乾燥した後、大気雰囲気の炉内で1150℃で4時間の熱処理を施す。
手順5で得られた熱処理粉を2モル/LのNaOH水溶液中で24時間撹拌し、粒子表面に存在するであろうシリカの除去処理を行う。次いで、ろ過・水洗し、乾燥する。
本例は、ε−Al0.37Fe1.63O3を合成した例である。
本例は、ε−Al0.45Fe1.55O3を合成した例である。
本例は、ε−Al0.53Fe1.47O3を合成した例である。
本例は、置換元素の添加が無いε−Fe2O3を合成した例である。
Claims (9)
- ε−Fe2O3結晶と空間群が同じであり、かつε−Fe2O3結晶のFeサイトの一部がAlで置換された構造の結晶を主相にもつ鉄酸化物相を有し、その鉄酸化物相におけるAlとFeのモル比をAl:Fe=x:(2−x)と表すとき、0<x<1を満たす磁性材料。
- ε−Fe2O3結晶と空間群が同じであり、かつε−Fe2O3結晶のFeサイトの一部がAlで置換された構造の結晶からなる鉄酸化物相を有し、その鉄酸化物相におけるAlとFeのモル比をAl:Fe=x:(2−x)と表すとき、0<x<1を満たす磁性材料。
- AlとFeのモル比に関する前記xの値が0.3〜0.8である請求項1または2に記載の磁性材料。
- 前記主相を構成する結晶の格子定数がε−Fe2O3結晶の格子定数より小さい値をとる請求項1または2に記載の磁性材料。
- TEM写真により測定される平均粒子径が5〜200nmの範囲にある磁性粒子からなる請求項1または2に記載の磁性材料。
- TEM写真により測定される平均粒子径が5〜200nmの範囲にあり、鉄酸化物相の周囲に非磁性化合物が付着している磁性粒子からなる請求項1または2に記載の磁性材料。
- TEM写真により測定される平均粒子径が5〜200nmの範囲にある磁性粒子からなり、常温で1000〜15000 Oe(7.96×104〜1.19×106A/m)の保磁力を有する請求項1または2に記載の磁性材料。
- TEM写真により測定される平均粒子径が5〜200nmの範囲にあり、単磁区構造の磁性粒子からなる請求項1または2に記載の磁性材料。
- TEM写真により測定される平均粒子径が5〜200nmの範囲にある磁性粒子からなる請求項1または2に記載の磁性材料を、各粒子結晶の磁化容易軸を所定の方向に配向して各粒子の位置を支持体上に固定した状態で支持させた磁気記録媒体の磁性層。
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JP2006234958A JP4728916B2 (ja) | 2006-08-31 | 2006-08-31 | 磁性材料 |
DE602007003787T DE602007003787D1 (de) | 2006-08-31 | 2007-08-16 | Magnetisches Material |
EP07016104A EP1900690B1 (en) | 2006-08-31 | 2007-08-16 | Magnetic material |
US11/892,911 US7781082B2 (en) | 2006-08-31 | 2007-08-28 | Magnetic material |
CN200710148356.XA CN101178965B (zh) | 2006-08-31 | 2007-08-31 | 磁性材料 |
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US7781082B2 (en) | 2010-08-24 |
EP1900690B1 (en) | 2009-12-16 |
DE602007003787D1 (de) | 2010-01-28 |
EP1900690A1 (en) | 2008-03-19 |
CN101178965B (zh) | 2012-05-09 |
CN101178965A (zh) | 2008-05-14 |
US20080057352A1 (en) | 2008-03-06 |
JP4728916B2 (ja) | 2011-07-20 |
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