JPH02141430A - Production of oxide-based magnetic powder - Google Patents
Production of oxide-based magnetic powderInfo
- Publication number
- JPH02141430A JPH02141430A JP63294906A JP29490688A JPH02141430A JP H02141430 A JPH02141430 A JP H02141430A JP 63294906 A JP63294906 A JP 63294906A JP 29490688 A JP29490688 A JP 29490688A JP H02141430 A JPH02141430 A JP H02141430A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- ions
- oxide
- crystal structure
- dissolution treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 150000002500 ions Chemical class 0.000 claims abstract description 23
- 239000002253 acid Substances 0.000 claims abstract description 19
- 238000004090 dissolution Methods 0.000 claims abstract description 18
- 239000013078 crystal Substances 0.000 claims abstract description 17
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 4
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 4
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims 1
- 229910052788 barium Inorganic materials 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 230000005415 magnetization Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 8
- 239000000725 suspension Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 235000005074 zinc chloride Nutrition 0.000 description 2
- 239000011592 zinc chloride Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001631 strontium chloride Inorganic materials 0.000 description 1
- AHBGXTDRMVNFER-UHFFFAOYSA-L strontium dichloride Chemical compound [Cl-].[Cl-].[Sr+2] AHBGXTDRMVNFER-UHFFFAOYSA-L 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011882 ultra-fine particle Substances 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
- C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G51/00—Compounds of cobalt
- C01G51/006—Compounds containing, besides cobalt, two or more other elements, with the exception of oxygen or hydrogen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
- C01P2002/52—Solid solutions containing elements as dopants
- C01P2002/54—Solid solutions containing elements as dopants one element only
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Iron (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、磁気記録方式塗布型媒体用材料として使用で
きる酸化物系磁性粉体の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing oxide-based magnetic powder that can be used as a material for magnetic recording type coated media.
従来の技術
従来から、ビデオテープ、音楽テープ、フロッピーディ
スク等の磁気記録方式塗布型媒体の磁性粉材料には、７
−Ｆｅ２ ｏ８．Ｃｏ被着７ Ｆ ｅ２０３ ＋メタ
ル粉等の針状磁性粉が使用されている。2. Prior Art Conventionally, magnetic powder materials for magnetic recording type coated media such as video tapes, music tapes, floppy disks, etc.
-Fe2 o8. Acicular magnetic powder such as Co-coated 7 Fe203 + metal powder is used.
近年、記録媒体の高密度化が要求される中にあっては、
上記磁性粉の微粒子化と高密度充填化による媒体の製造
が行なわれている。In recent years, with the demand for higher density recording media,
Media are being manufactured by making the magnetic powder finer and packing it with higher density.
発明が解決しようとする課題
しかしながら、上記磁性粉の微粒子化は、上記磁性粉が
形状磁気異方性による一軸異方性を利用しているため、
磁気異方性効果の面から考えて限界があるので、記録媒
体の高密度化を図るための磁性粉原料の改良は困難であ
るという課題があった。加えて、記録媒体用材料は、媒
体の信号出力を高くする必要があるため、高飽和磁化の
磁性粉体であることが課題であった。Problems to be Solved by the Invention However, since the magnetic powder utilizes uniaxial anisotropy due to shape magnetic anisotropy, it is difficult to make the magnetic powder into fine particles.
Since there is a limit in terms of magnetic anisotropy effect, it is difficult to improve magnetic powder raw materials to increase the density of recording media. In addition, since the recording medium material needs to increase the signal output of the medium, it has been a problem that it is a magnetic powder with high saturation magnetization.
本発明は、上記課題に鑑み、磁気異方性効果が粒子の長
さと厚さに依存しない結晶磁気異方性による一軸異方性
を持つ高飽和磁化の酸化物系磁性粉体の製造方法を提供
するものである。In view of the above problems, the present invention provides a method for producing oxide-based magnetic powder with high saturation magnetization and uniaxial anisotropy due to magnetocrystalline anisotropy, in which the magnetic anisotropy effect does not depend on the length and thickness of the particles. This is what we provide.
課題を解決するための手段
上記目的である結晶磁気異方性による一軸異方性を持つ
高飽和磁化の酸化物系磁性粉体を得るには、Ｘ線回折的
に、マグネットプランバイト型結晶構造部分を含む磁性
粉体の飽和磁化を向上させる方法を発明する必要があっ
た。Means for Solving the Problem In order to obtain the above-mentioned objective of oxide-based magnetic powder with high saturation magnetization having uniaxial anisotropy due to magnetocrystalline anisotropy, it is necessary to obtain a magnetoplumbite-type crystal structure using X-ray diffraction. There was a need to invent a method for improving the saturation magnetization of magnetic powders containing moieties.
この考えに沿って、上記目的を達成すべく検討を重ねた
結果、該磁性粉体を酸溶解処理して、該磁性粉体中のＢ
ａを溶解することが有効であることを見出し本発明を完
成するに至ったものであり、該磁性粉体を酸溶解処理す
るという構成を備えたものである。In line with this idea, as a result of repeated studies to achieve the above objective, the magnetic powder was subjected to an acid dissolution treatment to reduce the amount of B in the magnetic powder.
The present invention was completed by discovering that it is effective to dissolve a, and the present invention is equipped with a structure in which the magnetic powder is subjected to an acid dissolution treatment.
作用
本発明は、上記した構成のように、磁性粉体を酸性水溶
液中に入れて酸溶解処理することによって、結晶磁気異
方性による一軸異方性を持つ高飽和磁化の酸化物系磁性
粉体が得られるという作用がなされる。Function: As configured above, the present invention produces oxide-based magnetic powder with high saturation magnetization and uniaxial anisotropy due to magnetocrystalline anisotropy by placing magnetic powder in an acidic aqueous solution and subjecting it to acid dissolution treatment. The effect is that the body is gained.
実施例
以下本発明の一実施例の酸化物系磁性粉体の製造方法に
ついて説明する。EXAMPLE A method for producing oxide-based magnetic powder according to an example of the present invention will be described below.
実施例１
ガラス結晶化法によって合成された化学量論のバリウム
フェライト磁性粉体
（ＢａＦｅ、２−２ ＸＣｏｘＴｉＯＩ９）２５ｇをあ
らかじめ用意しておいた３規定の塩酸（ＨＣ１！、）水
溶液ＩＩ！、の入った２℃のビーカーに入れ、攪拌しな
がら１時間放置した。Example 1 25 g of stoichiometric barium ferrite magnetic powder (BaFe, 2-2 The mixture was placed in a beaker at 2° C. and left to stand for 1 hour while stirring.
次に、磁性粉体を取り出し、洗浄し、ろ過し、乾燥した
。The magnetic powder was then taken out, washed, filtered, and dried.
酸溶解処理前の磁性粉体と得られた磁性粉体は、化学分
析を行ないその組成を調べ、Ｘ線回折によりその結晶構
造を調べ、振動式磁力計で磁気特性を測定した。The magnetic powder before the acid dissolution treatment and the obtained magnetic powder were subjected to chemical analysis to examine their composition, X-ray diffraction to examine their crystal structure, and magnetic properties to measurement using a vibrating magnetometer.
表１に、酸溶解処理前と後の磁性粉体の組成、結晶構造
、および磁気特性を示した。Table 1 shows the composition, crystal structure, and magnetic properties of the magnetic powder before and after acid dissolution treatment.
表より明らかなように、磁性粉体を酸溶解処理すること
によって、飽和磁化が向上することがわかる。As is clear from the table, it can be seen that the saturation magnetization is improved by subjecting the magnetic powder to acid dissolution treatment.
以上のように、大方晶系バリウムフェライト磁性粉体を
酸溶解処理することにより、高飽和磁化化されたＢａと
Ｆｅとその他の元素からなる酸化物系磁性粉体を得るこ
とができる。As described above, by subjecting the orthogonal barium ferrite magnetic powder to acid dissolution treatment, it is possible to obtain highly saturated magnetized oxide-based magnetic powder consisting of Ba, Fe, and other elements.
（以 下 余 白）
実施例２
塩化バリウム（Ｂ ａ ２ Ｃ１２・Ｎ２０）４．８６
ｇ。(Left below) Example 2 Barium chloride (B a 2 C12/N20) 4.86
g.
塩化第二鉄（ＦｅＣｆｆｉ３ ・６Ｈ，，０）８１．０
９ｇ塩化コバルト（Ｃｏ Ｃ（！、２ ・６Ｈ２０）５
．７１ ｇ塩化亜鉛（ＺｎＣ１２）３．２７ ｇを水に
溶解し、全量を１０１００Ｏとした。あらかじめ準備し
た水酸化ナトリウム（ＮａＯＨ）水溶液と、上記の酸性
水溶液を、５！のフラスコ中で混合し、ｐＨ＝１３．２
の懸濁液を作製した。次に、この懸濁液を窒素ガスでバ
ブリングして攪拌しながら６０°Ｃで３０分間熟成し、
得られた共沈物を濾過により懸濁液から取り出し、水洗
後、乾燥し、粉砕して、原料粉を得た。Ferric chloride (FeCffi3 ・6H,,0) 81.0
9g cobalt chloride (Co C(!,2 ・6H20)5
．． 71 g of zinc chloride (ZnC12) and 3.27 g were dissolved in water, and the total amount was adjusted to 10,100O. Add the sodium hydroxide (NaOH) aqueous solution prepared in advance and the above acidic aqueous solution to 5! mixed in a flask, pH=13.2
A suspension was prepared. Next, this suspension was bubbled with nitrogen gas and aged at 60°C for 30 minutes while stirring.
The obtained coprecipitate was taken out from the suspension by filtration, washed with water, dried, and pulverized to obtain raw material powder.
得られた原料粉１０ｇを治具に入れ、Ｎ２ガス雰囲気中
において、６６０°Ｃで１時間焼成し、磁性粉を得た。10 g of the obtained raw material powder was placed in a jig and fired at 660° C. for 1 hour in an N2 gas atmosphere to obtain magnetic powder.
さらに、得られた磁性粉５ｇを、１規定の塩酸（ＨＣ／
り水溶液２００ｍｆｆの入った３００ｍＩ！。Furthermore, 5 g of the obtained magnetic powder was added to 1N hydrochloric acid (HC/
300mI containing 200mff of aqueous solution! .
のビーカーに入れ、攪拌しながら８０°Ｃで１時間放置
した。その後、磁性粉を濾過により水溶液から取り出し
、水洗後、乾燥した。The mixture was placed in a beaker and left at 80°C for 1 hour while stirring. Thereafter, the magnetic powder was taken out from the aqueous solution by filtration, washed with water, and then dried.
合成した磁性粉体を試料１−Ａとし、試料１−への酸溶
解処理後の磁性粉体を試料１−Ｂとする。The synthesized magnetic powder is referred to as Sample 1-A, and the magnetic powder after acid dissolution treatment in Sample 1- is referred to as Sample 1-B.
上記と同様の方法を用い作製し、Ｂａのモル数に対する
それ以外の元素のモル数の和の比が１６．０で、含まれ
る元素がＢａ、Ｆｅ、ＮｉＡｕである磁性粉体を、それ
ぞれ試料２−Ａ、試料２−Ｂとし、Ｂａのモル数に対す
るそれ以外の元素のモル数の和の比が１９．０で、含ま
れる元素がＢａ、Ｆｅ、Ｃｏ、Ｔｉ、Ｃｕである磁性粉
体をそれぞれ試料３−Ａ、試料３−Ｂとする。Samples of magnetic powder were prepared using the same method as above, and the ratio of the sum of the moles of other elements to the number of moles of Ba was 16.0, and the elements contained were Ba, Fe, and NiAu. 2-A and Sample 2-B, a magnetic powder in which the ratio of the sum of the moles of other elements to the number of moles of Ba is 19.0, and the elements contained are Ba, Fe, Co, Ti, and Cu. are designated as sample 3-A and sample 3-B, respectively.
得られた磁性粉体は、化学分析を行ないその組成を調べ
、Ｘ線回折によりその結晶構造を調べ、振動式磁力計で
磁気特性を測定した。The obtained magnetic powder was chemically analyzed to determine its composition, its crystal structure was determined by X-ray diffraction, and its magnetic properties were measured using a vibrating magnetometer.
表２に、合成した磁性粉体とその酸溶解処理後の磁性粉
体の組成、結晶構造、および磁気特性を示した。Table 2 shows the composition, crystal structure, and magnetic properties of the synthesized magnetic powder and the magnetic powder after acid dissolution treatment.
表より明らかなように、Ｂａ”イオン、Ｓｒ２”イオン
、Ｐｂ”＋イオン等のマグネットプランバイト型結晶構
造六方晶フェライトを形成する２価イオンのいずれか一
種、あるいは二種以上と、これらに対してモル比が１２
倍以上のＦｅイオンと、さらに、その他の極く少量の添
加金属イオンを含む水溶液と、アルカリ水溶液とを混合
することによって得られた共沈物を、非酸化性雰囲気で
焼成させて磁性粉体を得、さらに、該磁性粉体を酸溶解
処理することによって、−軸異方性を持ち、より高飽和
磁化の酸化物系磁性粉体を得ることができる。As is clear from the table, any one or more divalent ions forming hexagonal ferrite with a magnetoplumbite crystal structure, such as Ba" ions, Sr2" ions, and Pb"+ ions, and and the molar ratio is 12
A coprecipitate obtained by mixing an aqueous solution containing more than double the amount of Fe ions and a very small amount of other added metal ions with an alkaline aqueous solution is fired in a non-oxidizing atmosphere to form magnetic powder. By further subjecting the magnetic powder to an acid dissolution treatment, it is possible to obtain an oxide-based magnetic powder having -axis anisotropy and higher saturation magnetization.
（以 下 余 白）
実施例３
塩化ストロンチウム（ＳｒＣｊ！２−６Ｈ２０）５．４
５ｇ、塩化第二鉄（ＦｅＣＩ！、３・６Ｈ２０）８１．
０９ｇ、塩化コバルト（ＣｏＣｊ！２ ・６Ｈ２０）７
、１３ ｇを水に溶解し、全量を１０００ｍｎとした。(Left below) Example 3 Strontium chloride (SrCj!2-6H20) 5.4
5g, ferric chloride (FeCI!, 3.6H20) 81.
09g, cobalt chloride (CoCj!2 ・6H20) 7
, 13 g was dissolved in water to make a total amount of 1000 mn.
あらかじめ準備した水酸化ナトリウム（ＮａＯＨ）水溶
液と、上記の酸性水溶液を、５２のフラスコ中で混合し
、ｐＨ＝１２．０の懸濁液を作製した。A sodium hydroxide (NaOH) aqueous solution prepared in advance and the above acidic aqueous solution were mixed in a 52 flask to prepare a suspension having a pH of 12.0.
次に、この懸濁液を窒素ガスでバブリングして攪拌しな
がら６０°Ｃで３０分間熟成し、得られた共沈物を濾過
により懸濁液から取り出し、水洗後、乾燥し、粉砕して
、原料粉を得た。Next, this suspension was bubbled with nitrogen gas and aged at 60°C for 30 minutes while stirring, and the resulting coprecipitate was removed from the suspension by filtration, washed with water, dried, and crushed. , raw material powder was obtained.
得られた原料粉１０ｇを治具に入れ、Ｎ２−０．５χＨ
２ガス雰囲気中において、８００°Ｃで１時間焼成し、
磁性粉を得た。Put 10g of the obtained raw material powder into a jig and heat it with N2-0.5χH.
2. Baked at 800°C for 1 hour in a gas atmosphere,
Magnetic powder was obtained.
さらに、得られた磁性粉５ｇを、２規定の塩酸（ＨＣｊ
りと硝酸（ＨＮＯ３）の混酸水溶液２００ｍ１（Ｄ入っ
た３ ００ｍｆのビーカーに入れ、攪拌しながら２時間
放置した。その後、磁性粉を濾過により水溶液から取り
出し、水洗後、乾燥した。Furthermore, 5 g of the obtained magnetic powder was dissolved in 2N hydrochloric acid (HCj
The magnetic powder was placed in a 300 mf beaker containing 200 ml (D) of a mixed acid aqueous solution of nitric acid and nitric acid (HNO3), and left to stand for 2 hours while stirring.Then, the magnetic powder was removed from the aqueous solution by filtration, washed with water, and dried.
合成した磁性粉体を試料４−Ａとし、試料４−Ａの酸溶
解処理後の磁性粉体を試料４−Ｂとする。The synthesized magnetic powder is designated as Sample 4-A, and the magnetic powder obtained after the acid dissolution treatment of Sample 4-A is designated as Sample 4-B.
得られた磁性粉体は、化学分析を行ない、その組成を調
べ、Ｘ線回折によりその結晶構造を調べ、振動式磁力計
で磁気特性を測定した。The obtained magnetic powder was chemically analyzed to examine its composition, its crystal structure was examined by X-ray diffraction, and its magnetic properties were measured using a vibrating magnetometer.
表３に、試料４−Ａと試料１−Ｂの組成、結晶構造、お
よび磁気特性を示した。Table 3 shows the composition, crystal structure, and magnetic properties of Sample 4-A and Sample 1-B.
表より明らかなように、Ｂａ”イオン、Ｓｒ”イオン
Ｐｂ２″″イオン等のマグネットプランバイト型結晶構
造六方晶フェライトを形成する２価イオンのいずれか一
種、あるいは、二種以上と、これらに対してモル比が１
２倍以上のＦｅイオンと、さらに、その他の極く少量の
添加金属イオンを含む水溶液とアルカリ水溶液を混合す
ることによって得られた共沈物を、非酸化性雰囲気で焼
成させて磁性粉体を得、さらに、該磁性粉体を酸溶解処
理することによって、−軸異方性を持ち、より高飽和磁
化の酸化物系磁性粉体を得ることができる。As is clear from the table, Ba” ion, Sr” ion
Any one type or two or more types of divalent ions forming hexagonal ferrite with a magnetoplumbite crystal structure such as Pb2'' ions, and a molar ratio of 1 to these ions.
A coprecipitate obtained by mixing an aqueous solution containing more than twice the amount of Fe ions and a very small amount of other added metal ions with an alkaline aqueous solution is fired in a non-oxidizing atmosphere to form magnetic powder. Furthermore, by subjecting the magnetic powder to an acid dissolution treatment, it is possible to obtain an oxide-based magnetic powder having -axis anisotropy and higher saturation magnetization.
発明の効果
以上のように本発明は、結晶磁気異方性による一軸異方
性を持つ酸化物系磁性粉体を酸溶解処理することにより
、高飽和磁化の酸化物系磁性粉体を提供するので、超微
粒子化と高飽和磁化を兼ね備えた磁性粉体の出現が可能
となる。Effects of the Invention As described above, the present invention provides oxide-based magnetic powder with high saturation magnetization by subjecting oxide-based magnetic powder having uniaxial anisotropy due to magnetocrystalline anisotropy to acid dissolution treatment. Therefore, it becomes possible to create a magnetic powder that has both ultrafine particles and high saturation magnetization.
従って、これを高密度充填することによって、より高密
度の磁気記録方式塗布型媒体を作ることができる。Therefore, by packing them at a high density, a magnetic recording type coated medium with a higher density can be produced.
Claims (2)
理することによって、高飽和磁化化されることを特徴と
する酸化物系磁性粉体の製造方法。(1) A method for producing oxide-based magnetic powder, characterized in that it is made highly saturated magnetized by subjecting hexagonal barium ferrite magnetic powder to acid dissolution treatment.
ネル型結晶構造の部分を同一粒子内に共存して持ち、か
つ、結晶磁気異方性による一軸異方性を持つ酸化物系磁
性粉体の製造方法であって、Ｂａ＾２＾＋イオン，Ｓｒ
＾２＾＋イオン，Ｐｂ＾２イオン等のマグネットプラン
バイト型結晶構造六方晶フェライトを形成する２価イオ
ンのいずれか一種、あるいは、二種以上と、これらに対
してモル比が１２倍以上のＦｅイオンと、さらに、その
他の極く少量の添加金属イオンを含む水溶液と、アルカ
リ水溶液とを混合することによって得られた共沈物を、
非酸化性雰囲気で焼成させて磁性粉体を得、さらに、前
記磁性粉体を酸溶解処理することを特徴とする酸化物系
磁性粉体の製造方法。(2) Production of oxide-based magnetic powder that has a magnetoplumbite-type crystal structure part and a spinel-type crystal structure part coexisting in the same particle, and has uniaxial anisotropy due to magnetocrystalline anisotropy. A method, comprising: Ba^2^+ ion, Sr
Any one type or two or more types of divalent ions forming hexagonal ferrite with a magnetoplumbite crystal structure such as ^2^+ ions, Pb^2 ions, etc., and a molar ratio of 12 times or more to these ions. A coprecipitate obtained by mixing Fe ions, an aqueous solution containing a very small amount of other added metal ions, and an alkaline aqueous solution,
1. A method for producing oxide-based magnetic powder, which comprises firing in a non-oxidizing atmosphere to obtain magnetic powder, and further subjecting the magnetic powder to acid dissolution treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63294906A JPH02141430A (en) | 1988-11-22 | 1988-11-22 | Production of oxide-based magnetic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63294906A JPH02141430A (en) | 1988-11-22 | 1988-11-22 | Production of oxide-based magnetic powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02141430A true JPH02141430A (en) | 1990-05-30 |
Family
ID=17813788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63294906A Pending JPH02141430A (en) | 1988-11-22 | 1988-11-22 | Production of oxide-based magnetic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02141430A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56155023A (en) * | 1980-04-28 | 1981-12-01 | Toshiba Corp | Preparation of ba-ferrite |
| JPS63277523A (en) * | 1987-05-07 | 1988-11-15 | Matsushita Electric Ind Co Ltd | Production of platelike magnetic powder |
-
1988
- 1988-11-22 JP JP63294906A patent/JPH02141430A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56155023A (en) * | 1980-04-28 | 1981-12-01 | Toshiba Corp | Preparation of ba-ferrite |
| JPS63277523A (en) * | 1987-05-07 | 1988-11-15 | Matsushita Electric Ind Co Ltd | Production of platelike magnetic powder |
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