JPH0826734A - Magnetic ca-v garnet oxide powder - Google Patents
Magnetic ca-v garnet oxide powderInfo
- Publication number
- JPH0826734A JPH0826734A JP6186624A JP18662494A JPH0826734A JP H0826734 A JPH0826734 A JP H0826734A JP 6186624 A JP6186624 A JP 6186624A JP 18662494 A JP18662494 A JP 18662494A JP H0826734 A JPH0826734 A JP H0826734A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- oxide powder
- garnet oxide
- magnetic garnet
- magnetic
- 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.)
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Classifications
-
- 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
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
- H01F1/346—[(TO4) 3] with T= Si, Al, Fe, Ga
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、Ｃａ−Ｖ系磁性ガーネ
ットの原料となる高純度で、組成が均一で、かつ微細粒
径のＣａ−Ｖ系磁性ガーネット酸化物粉末とその製造方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Ca-V magnetic garnet oxide powder having a high purity, a uniform composition and a fine particle size, which is a raw material for a Ca-V magnetic garnet, and a method for producing the same.
【０００２】[0002]
【従来の技術】以前より、Ｃａ−Ｖ系磁性ガーネット材
料はマイクロ波アイソレータ用材料として用いられてい
る。このアイソレータ用の材料としては低磁界損失が小
さく、飽和磁化の小さいことが要求されるが、Ｃａ−Ｖ
系磁性ガーネット材料はこれらの条件を満たす優れた材
料である。ところで、従来のＣａ−Ｖ系磁性ガーネット
酸化物粉末の製造には、一般的な粉末冶金による固相反
応を利用した製法や共沈法が用いられてきた。2. Description of the Related Art Ca-V based magnetic garnet materials have been used as materials for microwave isolators. As a material for this isolator, low magnetic field loss and small saturation magnetization are required.
The magnetic garnet material is an excellent material that satisfies these conditions. By the way, in the conventional production of Ca-V based magnetic garnet oxide powder, a production method utilizing a solid phase reaction by general powder metallurgy and a coprecipitation method have been used.
【０００３】前者においては、Ｃａ−Ｖ系磁性ガーネッ
トの構成元素であるＦｅ、Ｃａ、Ｖ、および希土類元素
（但し、Ｙを含む）等の酸化物粉末を目標組成になるよ
うに秤量し、湿式もしくは乾式で混合し、乾燥、熱処理
を施して製造する。In the former case, oxide powders such as Fe, Ca, V, which are the constituent elements of the Ca-V magnetic garnet, and rare earth elements (including Y) are weighed so as to have a target composition, and wet. Alternatively, it is produced by dry-mixing, drying and heat treatment.
【０００４】又、共沈法においては、目標の組成になる
ように調整した硝酸塩混合水溶液に、アンモニア水等の
アルカリ溶液をＰＨが９〜１１前後になるように加え、
共沈澱物を得る。この共沈澱物を蒸留水等で充分に洗浄
し、遠心分離機等により脱水した後、乾燥し、５００〜
７００℃で熱処理して磁性ガーネット粉末を製造する。Further, in the coprecipitation method, an alkaline solution such as ammonia water is added to a nitrate mixed aqueous solution adjusted to have a target composition so that the pH is about 9 to 11,
A coprecipitate is obtained. The coprecipitate is thoroughly washed with distilled water or the like, dehydrated by a centrifuge or the like, and then dried to obtain 500-
A magnetic garnet powder is manufactured by heat treatment at 700 ° C.
【０００５】[0005]
【発明が解決しようとする課題】従来の一般的な粉末冶
金法により、Ｃａ−Ｖ系磁性ガーネット酸化物粉末を製
造しようとする場合、Ｆｅ、Ｃａ、Ｖ、および希土類元
素（但し、Ｙを含む）の酸化物原料粉末を均一に混合す
ることは非常に難しく、分散剤を溶媒に加えて粉末同志
の凝集を防ぎながら長時間混合しなければならない。長
時間混合する場合には、外部やボールミル装置等から不
純物が混入する可能性があり、製造工程の管理が難し
い。又長時間混合することはコストアップにもつなが
る。特に湿式混合の場合では、脱水、乾燥の工程を経た
後、熱処理を施さなければならないため非常に手間がか
かりコスト高の要因となっている。When a Ca-V type magnetic garnet oxide powder is to be manufactured by a conventional general powder metallurgy method, Fe, Ca, V, and a rare earth element (provided that Y is included). It is very difficult to uniformly mix the oxide raw material powders in 1), and it is necessary to add a dispersant to the solvent and mix them for a long time while preventing the powders from coagulating. When mixing for a long time, impurities may be mixed in from the outside or a ball mill device, which makes it difficult to control the manufacturing process. Also, mixing for a long time leads to an increase in cost. Particularly in the case of wet mixing, heat treatment must be performed after the steps of dehydration and drying, which is very troublesome and causes a cost increase.
【０００６】又、一般的な粉末冶金による製造方法にお
いては、熱処理の段階における反応が固相反応であるた
め、均一に構成元素同志を反応させることは非常に困難
で、均一な組成のＣａ−Ｖ系磁性ガーネット酸化物粉末
を得ることは難しい。Further, in a general method of manufacturing by powder metallurgy, since the reaction in the stage of heat treatment is a solid phase reaction, it is very difficult to uniformly react the constituent elements, and Ca- having a uniform composition is used. It is difficult to obtain a V-based magnetic garnet oxide powder.
【０００７】一方、共沈法の場合には、組成の均一な粉
末は得られるが、反応に時間がかかるため量産に適して
いない。On the other hand, in the case of the coprecipitation method, a powder having a uniform composition can be obtained, but the reaction takes time, which is not suitable for mass production.
【０００８】近年、積層タイプのアイソレータへの応用
が考えられており、平均粒径０.５μｍ以下でかつ粒度
分布の狭いＣａ−Ｖ系磁性ガーネット酸化物粉末の要求
が高まってきている。しかし、粉末冶金的な製造方法で
は、出発原料の粉末の平均粒径が既に０.５μｍ以上あ
り、更に、熱処理を施すため粒成長を引き起こし、この
要求に応えることができない。一方、共沈法によっても
５００〜７００℃で熱処理を施さねばならず、この熱処
理により粒成長が進み、上記の要求を満たすことができ
ない。従って、粒径が大きいことから、固相反応を完結
するためには、焼成温度が１３００℃以上となり、層状
の磁性粉末と導体との一体焼成を可能とするためには、
内部導体あるいは電極は、融点の高いＰｄ系合金を使わ
なければならず、低コスト化のためにも焼成温度の低下
が可能なＣａ−Ｖ系磁性ガーネット酸化物粉末が望まれ
ている。In recent years, application to a laminated type isolator has been considered, and there is an increasing demand for Ca-V type magnetic garnet oxide powder having an average particle size of 0.5 μm or less and a narrow particle size distribution. However, in the powder metallurgical manufacturing method, the average particle diameter of the powder of the starting material is already 0.5 μm or more, and further, heat treatment is performed, so that grain growth is caused, and this requirement cannot be met. On the other hand, the coprecipitation method also requires heat treatment at 500 to 700 [deg.] C., and this heat treatment promotes grain growth, so that the above requirements cannot be satisfied. Therefore, since the particle size is large, in order to complete the solid phase reaction, the firing temperature is 1300 ° C. or higher, and in order to enable the layered magnetic powder and the conductor to be fired integrally,
A Pd-based alloy having a high melting point must be used for the internal conductor or the electrode, and a Ca-V-based magnetic garnet oxide powder capable of lowering the firing temperature is desired for cost reduction.
【０００９】又、積層タイプのアイソレータを作製する
場合、層状の磁性層を形成するのに、Ｃａ−Ｖ系磁性ガ
ーネット酸化物粉末の粒子形状は、異方的なものが望ま
しい。しかし、粉末冶金法、共沈法、いずれの製法によ
っても異方的な形状を有する粉末粒子を得ることができ
ない。Further, in the case of manufacturing a laminated type isolator, it is desirable that the particle shape of the Ca-V type magnetic garnet oxide powder is anisotropic in order to form a layered magnetic layer. However, powder particles having an anisotropic shape cannot be obtained by any of the powder metallurgy method and the coprecipitation method.
【００１０】従って、本発明の技術的課題は、従来の粉
末冶金法、あるいは共沈法等の製法で得られた粉末より
も微粒で、粒度が揃っており、かつ異方的な形状を有す
るＣａ−Ｖ系磁性ガーネット酸化物粉末、およびその製
法を供するものである。Therefore, the technical problem of the present invention is that the powder obtained is finer than the powder obtained by the conventional powder metallurgical method or the coprecipitation method, and has a uniform particle size and an anisotropic shape. The present invention provides a Ca-V based magnetic garnet oxide powder and a method for producing the same.
【００１１】[0011]
【課題を解決するための手段】Ｆｅ、Ｃａ、Ｖ、および
Ｙを含む希土類元素の少なくとも１種（Ｒ）からなる磁
性ガーネット酸化物粉末において、Ｃａ、Ｆｅ、Ｖ、お
よびＲの硝酸塩とアミノ酸との錯体の溶液を溶媒の沸点
以上の温度で加熱して得られたＣａ−Ｖ系磁性ガーネッ
ト酸化物粉末は、積層タイプのアイソレータにも適用可
能な磁性粉末である。In a magnetic garnet oxide powder composed of at least one rare earth element (R) containing Fe, Ca, V and Y, a nitrate of Ca, Fe, V and R and an amino acid are added. The Ca-V based magnetic garnet oxide powder obtained by heating the solution of the complex of above at a temperature not lower than the boiling point of the solvent is a magnetic powder applicable to a laminated type isolator.
【００１２】[0012]
【作用】Ｃａ−Ｖ系磁性ガーネット酸化物粉末の構成元
素の硝酸塩とアミノ酸との錯体の溶液を、その溶媒の沸
点以上の温度で加熱すると、自己燃焼反応が起こり、組
成の均一なＣａ−Ｖ系磁性ガーネット酸化物粉末が得ら
れる。この反応は非常に速やかに起こるため、量産性が
高い。更に、反応が瞬時に進むことから粒成長が起こら
ないため、平均粒径が０.５μｍ以下で粒度分布の幅の
狭いＣａ−Ｖ系磁性ガーネット酸化物粉末を製造するこ
とができる。When a solution of the complex of nitrate of the constituent elements of the Ca-V type magnetic garnet oxide powder and an amino acid is heated at a temperature higher than the boiling point of the solvent, a self-combustion reaction occurs and Ca-V having a uniform composition is produced. A magnetic garnet oxide powder is obtained. Since this reaction occurs very quickly, mass productivity is high. Furthermore, since the reaction proceeds instantaneously and grain growth does not occur, it is possible to produce a Ca—V magnetic garnet oxide powder having an average grain size of 0.5 μm or less and a narrow grain size distribution.
【００１３】又、現在の所、技術的な根拠は不明ではあ
るが、異方的な形状の粉末の製造が可能である。At present, although the technical basis is unknown, it is possible to manufacture an anisotropically shaped powder.
【００１４】更に、本発明により製造された粉末を基板
に塗布した後、熱処理することにより、Ｃａ−Ｖ系磁性
ガーネットの厚膜の製造が可能である。Furthermore, a thick film of Ca-V type magnetic garnet can be manufactured by applying the powder manufactured by the present invention to a substrate and then heat treating it.
【００１５】[0015]
【実施例】以下、本発明の実施例について説明する。Embodiments of the present invention will be described below.
【００１６】（実施例１）Ｃａ、Ｖ、Ｙ、Ｆｅの硝酸塩
を組成が（Ｃａ1.4Ｙ1.6）（Ｆｅ1/3Ｖ2/3）5Ｏ1 2とな
るように秤量し、純水中に溶解させ、その溶液中にアミ
ノ酸を１５ｗｔ％となるように添加し、よく混合した。
次に、この溶液を３００℃に加熱し、水分を蒸発させ
た。水分蒸発後、溶液の残留物は自己燃焼反応を起こ
し、Ｃａ−Ｖ系磁性ガーネット酸化物粉末を得た。[0016] (Example 1) Ca, V, Y, nitrate composition of Fe (Ca 1.4 Y 1.6) (Fe 1/3 V 2/3) 5 O 1 2 and were weighed so as to, pure water Was dissolved in, and the amino acid was added to the solution so as to be 15 wt%, and mixed well.
Next, this solution was heated to 300 ° C. to evaporate water. After evaporation of water, the residue of the solution caused a self-combustion reaction to obtain a Ca-V based magnetic garnet oxide powder.
【００１７】（比較例１）比較例としての共沈法による
粉末の製造は、次のように行った。組成が（Ｃａ1.4Ｙ
1.6）（Ｆｅ1/3Ｖ2/3）5Ｏ12となるように調整したＣ
ａ、Ｙ、Ｖ、Ｆｅの硝酸塩を純水に溶解し、これにアン
モニア水を混入し、共沈澱物を得た。最終的な溶液のＰ
Ｈは、１０.７であった。この沈澱物を５００〜７００
℃で１時間熱処理することにより、粉末を得た。Comparative Example 1 The production of powder by the coprecipitation method as a comparative example was carried out as follows. The composition is (Ca 1.4 Y
1.6 ) C adjusted to be (Fe 1/3 V 2/3 ) 5 O 12
The nitrates of a, Y, V, and Fe were dissolved in pure water, and ammonia water was mixed therein to obtain a coprecipitate. P of final solution
H was 10.7. 500-700 of this precipitate
The powder was obtained by heat-treating at 1 degreeC for 1 hour.
【００１８】（比較例２）比較例としての通常の粉末冶
金法による粉末の製造方法は、次の通りである。原料と
しては、ＣａＯ、Ｖ2Ｏ3、Ｙ2Ｏ3、Ｆｅ2Ｏ3の粉末を
（Ｃａ1.4Ｙ1.6）（Ｆｅ1/3Ｖ2/3）5Ｏ12となるように
秤量し、純水中で４０時間エンプラ製のボールミルで混
合し、脱水、乾燥させた後、７００℃で熱処理して粉末
を得た。(Comparative Example 2) As a comparative example, a method for producing powder by a usual powder metallurgy method is as follows. As raw materials, powders of CaO, V 2 O 3 , Y 2 O 3 , and Fe 2 O 3 were weighed so as to be (Ca 1.4 Y 1.6 ) (Fe 1/3 V 2/3 ) 5 O 12, and then pure. The mixture was mixed in water for 40 hours with an engineering plastic ball mill, dehydrated and dried, and then heat-treated at 700 ° C. to obtain a powder.
【００１９】図１に、本発明により製造されたＣａ−Ｖ
系磁性ガーネット酸化物粉末の粒度分布と、比較例とし
て、従来の製造方法により製造されたＣａ−Ｖ系磁性ガ
ーネット酸化物粉末の粒度分布を示す。図中（１）は、
本発明より製造された粉末の粒度分布であり、（２）
は、比較例として共沈法により製造された粉末の粒度分
布、（３）は、比較例として従来の粉末冶金法により製
造された粉末の粒度分布である。FIG. 1 shows the Ca-V produced according to the present invention.
The particle size distribution of the system magnetic garnet oxide powder and the particle size distribution of the Ca-V system magnetic garnet oxide powder manufactured by the conventional manufacturing method are shown as a comparative example. (1) in the figure
2 is a particle size distribution of the powder produced by the present invention, (2)
Is a particle size distribution of the powder produced by the coprecipitation method as a comparative example, and (3) is a particle size distribution of the powder produced by the conventional powder metallurgy method as a comparative example.
【００２０】この結果からわかるように、本発明によれ
ば、従来の方法に比べて、粒度分布の幅が狭く、平均粒
径の小さな粉末が得られる。As can be seen from these results, according to the present invention, a powder having a narrow particle size distribution and a small average particle size can be obtained as compared with the conventional method.
【００２１】（実施例２）Ｖ、Ｙ、Ｃａ、Ｆｅの硝酸塩
を組成が［（Ｃａ3/4Ｙ1/4）3（Ｆｅ2/3Ｖ1/3）5Ｏ12］
となるように秤量し、純水に溶解し、その溶液中にアミ
ノ酸を１５ｗｔ％添加し、よく混合した。次に、この溶
液を３００℃に加熱し、水分を蒸発させた。水分蒸発
後、溶液の残留物は自己燃焼反応を起こし、Ｃａ−Ｖ系
磁性ガーネット酸化物粉末を得た。(Example 2) V, Y, Ca, and Fe nitrates having a composition of [(Ca 3/4 Y 1/4 ) 3 (Fe 2/3 V 1/3 ) 5 O 12 ].
Were weighed so as to obtain the following, dissolved in pure water, and 15 wt% of amino acid was added to the solution and mixed well. Next, this solution was heated to 300 ° C. to evaporate water. After evaporation of water, the residue of the solution caused a self-combustion reaction to obtain a Ca-V based magnetic garnet oxide powder.
【００２２】（比較例３）比較例としての共沈法による
粉末の製造は、次のように行った。Ｙ、Ｃａ、Ｆｅ、Ｖ
の硝酸塩を（Ｃａ3/4Ｙ1/4）3（Ｆｅ2/3Ｖ1/3）5Ｏ12と
なるように秤量し、純水に溶解し、これにアンモニア水
を混入し、共沈澱物を得た。最終的な溶液のＰＨは１
０.７であった。この沈澱物を５００〜７００℃で１時
間熱処理することにより、粉末を得た。(Comparative Example 3) The production of powder by the coprecipitation method as a comparative example was carried out as follows. Y, Ca, Fe, V
Of nitrate of (Ca 3/4 Y 1/4 ) 3 (Fe 2/3 V 1/3 ) 5 O 12 was weighed, dissolved in pure water, mixed with ammonia water, and coprecipitated. I got a thing. PH of the final solution is 1
It was 0.7. This precipitate was heat-treated at 500 to 700 ° C. for 1 hour to obtain a powder.
【００２３】（比較例４）比較例として、実施例２と同
一組成のＣａ−Ｖ系磁性ガーネット酸化物粉末を、比較
例２と同様な粉末治金法によって得た。(Comparative Example 4) As a comparative example, a Ca-V type magnetic garnet oxide powder having the same composition as in Example 2 was obtained by the same powder metallurgy method as in Comparative Example 2.
【００２４】これらの粉末をプレス成形して、１２００
〜１３００℃で焼成し、焼結体の相対密度を測定した結
果を図２に示す。図２において、縦軸に相対密度
（％）、横軸に焼結温度（℃）を示している。（４）は
本発明の粉末によるもの、（５）は比較例であって共沈
法によって作製された粉末によるもの、（６）も比較例
であって粉末冶金方法により作製された粉末によるもの
である。These powders were pressed into 1200
FIG. 2 shows the result of measuring the relative density of the sintered body by firing at ˜1300 ° C. In FIG. 2, the vertical axis shows the relative density (%) and the horizontal axis shows the sintering temperature (° C.). (4) is based on the powder of the present invention, (5) is based on the powder prepared by the coprecipitation method as a comparative example, and (6) is also based on the powder manufactured by the powder metallurgy method as a comparative example. Is.
【００２５】図２からわかるように、本発明の方法によ
る粉末を使用したものは、従来の製法による粉末を使用
したものに比べて、低温で相対密度の高い焼結体が得ら
れることがわかる。As can be seen from FIG. 2, the one using the powder according to the present invention can obtain a sintered body having a high relative density at a low temperature, as compared with the one using the powder according to the conventional manufacturing method. .
【００２６】更に、図３に、本発明および従来のＣａ−
Ｖ系磁性ガーネット酸化物粉末の形状を比較して示す。
縦軸は相対頻度を、横軸は粉体のＳＥＭ像より２次元的
な解析により粉体の慣性モーメントを求め、それに相当
する楕円の短軸／長軸の比を示している。なお、粉末試
料は、実施例２および比較例３によるものを使用した。Furthermore, FIG.
The shapes of V-based magnetic garnet oxide powders are shown for comparison.
The vertical axis shows the relative frequency, and the horizontal axis shows the moment of inertia of the powder by two-dimensional analysis from the SEM image of the powder, and shows the minor axis / major axis ratio of the ellipse corresponding thereto. The powder samples used in Example 2 and Comparative Example 3 were used.
【００２７】図３からわかるように、本発明によれば従
来の共沈法に比べて短軸／長軸の比が小さい異方的な粉
末が得られている。As can be seen from FIG. 3, according to the present invention, an anisotropic powder having a smaller minor axis / major axis ratio than the conventional coprecipitation method is obtained.
【００２８】[0028]
【発明の効果】本発明によれば、従来の共沈法等の製造
方法に比べて、微粒で粒度が揃っており、異方的な形状
の粉末が得られる。又、得られた粉末を用いて焼結すれ
ば、従来法よりも低い温度でＣａ−Ｖ系磁性ガーネット
が得られる。EFFECTS OF THE INVENTION According to the present invention, as compared with the conventional manufacturing method such as the coprecipitation method, an anisotropically shaped powder having fine particles and a uniform particle size can be obtained. If the obtained powder is sintered, a Ca-V type magnetic garnet can be obtained at a lower temperature than the conventional method.
【図１】組成が（Ｃａ1.4Ｙ1.6）（Ｆｅ1/3Ｖ2/3）5Ｏ
12で示される本発明によるＣａ−Ｖ系磁性ガーネット酸
化物粉末と、従来法による粉末との粒度分布を比較して
示す特性図。1] The composition is (Ca 1.4 Y 1.6 ) (Fe 1/3 V 2/3 ) 5 O
The characteristic view which compares and shows the particle size distribution of the Ca-V type | system | group magnetic garnet oxide powder by this invention shown by 12 and the powder by the conventional method.
【図２】組成が（Ｃａ3/4Ｙ1/4）3（Ｖ1/3Ｆｅ2/3）5Ｏ
12で示される本発明によるＣａ−Ｖ系磁性ガーネット酸
化物粉末、および従来法による粉末を使用して作製した
焼結体の相対密度の焼結温度依存性を比較して示す特性
図。[Fig. 2] Composition (Ca 3/4 Y 1/4 ) 3 (V 1/3 Fe 2/3 ) 5 O
12 is a characteristic diagram showing a comparison of the sintering temperature dependence of the relative density of a sintered body produced by using the Ca—V based magnetic garnet oxide powder according to the present invention shown by 12 and the powder according to the conventional method.
【図３】本発明および従来法によるＣａ−Ｖ系磁性ガー
ネット酸化物粉末の形状の解析結果を比較して示した特
性図。FIG. 3 is a characteristic diagram showing comparison of analysis results of the shapes of Ca—V magnetic garnet oxide powders according to the present invention and the conventional method.
（１） 本発明の方法によって得られた粉末（実施例
１） （２） 共沈法によって得られた粉末（比較例１） （３） 粉末治金的な方法によって得られた粉末（比
較例２） （４） 本発明の方法によって得られた粉末（実施例
２） （５） 共沈法によって得られた粉末（比較例３） （６） 粉末冶金的な方法によって得られた粉末（比
較例４）(1) Powder obtained by the method of the present invention (Example 1) (2) Powder obtained by coprecipitation method (Comparative example 1) (3) Powder obtained by powder metallurgical method (Comparative example) 2) (4) Powder obtained by the method of the present invention (Example 2) (5) Powder obtained by coprecipitation method (Comparative Example 3) (6) Powder obtained by powder metallurgical method (Comparison Example 4)
Claims (1)
ジウム（Ｖ）、およびＲ（ここでＲはイットリウムを含
む希土類元素のうち少なくとも１種）からなるＣａ−Ｖ
系磁性ガーネット酸化物粉末において、Ｃａ、Ｆｅ、
Ｖ、およびＲの硝酸塩とアミノ酸との錯体の溶液を、そ
の溶媒の沸点以上の温度で加熱して得られた、平均粒径
が０.５μｍ以下で、異方的な形状を有する粉末である
ことを特徴とするＣａ−Ｖ系磁性ガーネット酸化物粉
末。1. A Ca-V composed of iron (Fe), calcium (Ca), vanadium (V), and R (where R is at least one of rare earth elements including yttrium).
In the system-based magnetic garnet oxide powder, Ca, Fe,
A powder having an anisotropic shape and having an average particle size of 0.5 μm or less, which is obtained by heating a solution of a complex of nitrate of V and R and an amino acid at a temperature higher than the boiling point of the solvent. Ca-V type magnetic garnet oxide powder characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6186624A JPH0826734A (en) | 1994-07-15 | 1994-07-15 | Magnetic ca-v garnet oxide powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6186624A JPH0826734A (en) | 1994-07-15 | 1994-07-15 | Magnetic ca-v garnet oxide powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0826734A true JPH0826734A (en) | 1996-01-30 |
Family
ID=16191842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6186624A Withdrawn JPH0826734A (en) | 1994-07-15 | 1994-07-15 | Magnetic ca-v garnet oxide powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0826734A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005139050A (en) * | 2003-11-10 | 2005-06-02 | Toda Kogyo Corp | Ferrite magnetic powder and resin composition for semiconductor sealing, containing ferrite magnetic powder |
| CN105087924A (en) * | 2015-10-11 | 2015-11-25 | 江西理工大学 | Auxiliary leaching agent used for reinforced leaching of ion-type rare earth ores and leaching method thereof |
| CN105427995A (en) * | 2015-12-21 | 2016-03-23 | 浙江凯文磁业有限公司 | Preparation method for improving NdFeB (neodymium iron boron) coercivity by organic heavy rare earth complex |
-
1994
- 1994-07-15 JP JP6186624A patent/JPH0826734A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005139050A (en) * | 2003-11-10 | 2005-06-02 | Toda Kogyo Corp | Ferrite magnetic powder and resin composition for semiconductor sealing, containing ferrite magnetic powder |
| CN105087924A (en) * | 2015-10-11 | 2015-11-25 | 江西理工大学 | Auxiliary leaching agent used for reinforced leaching of ion-type rare earth ores and leaching method thereof |
| CN105427995A (en) * | 2015-12-21 | 2016-03-23 | 浙江凯文磁业有限公司 | Preparation method for improving NdFeB (neodymium iron boron) coercivity by organic heavy rare earth complex |
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