JPH09129433A - Soft magnetic hexagonal ferrite - Google Patents
Soft magnetic hexagonal ferriteInfo
- Publication number
- JPH09129433A JPH09129433A JP7308281A JP30828195A JPH09129433A JP H09129433 A JPH09129433 A JP H09129433A JP 7308281 A JP7308281 A JP 7308281A JP 30828195 A JP30828195 A JP 30828195A JP H09129433 A JPH09129433 A JP H09129433A
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- Japan
- Prior art keywords
- cao
- bao
- ferrite
- mol
- soft 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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- Compounds Of Iron (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、透磁率の高周波特
性に優れた軟磁性六方晶フェライトに関する。TECHNICAL FIELD The present invention relates to a soft magnetic hexagonal ferrite excellent in high frequency characteristics of magnetic permeability.
【０００２】[0002]
【従来の技術】軟磁性六方晶フェライト（一般に、フェ
ロックスプレーナー型フェライトと言われている）は、
スピネルフェライトにおいて周知のＳｎｏｅｋの限界を
破る高周波磁性材料である。従って、従来のスピネルフ
ェライトを用いた電波吸収体と比較して、高周波帯域で
の透磁率の減衰が小さく、近年の電子機器の高周波化に
対応可能な軟磁性材料である。2. Description of the Related Art Soft magnetic hexagonal ferrite (generally referred to as Ferroc sprayer type ferrite) is
It is a high-frequency magnetic material that breaks the Snoek limit well known for spinel ferrite. Therefore, it is a soft magnetic material that has a smaller attenuation of the magnetic permeability in the high frequency band as compared with the conventional radio wave absorber using spinel ferrite, and is compatible with the high frequency of electronic devices in recent years.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来のフェロ
ックスプレーナー型フェライトの透磁率の周波数特性
は、スピネルフェライトと比較して、高周波側での減衰
は小さいものの、著しい優位性は存在していない。However, the frequency characteristic of the magnetic permeability of the conventional ferro-sprayer-type ferrite is smaller than that of spinel ferrite at the high frequency side, but there is no significant advantage. .
【０００４】本発明の技術的課題は、透磁率の高周波特
性を改善した軟磁性六方晶フェライト（フェロックスプ
レーナー型フェライト）を得ることである。A technical object of the present invention is to obtain a soft magnetic hexagonal ferrite (ferroc sprayer type ferrite) having improved high frequency characteristics of magnetic permeability.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、Ｂａ
Ｏ：１０〜３０ｍｏｌ％、Ｆｅ2Ｏ3：５６〜６５ｍｏｌ
％、ＭｅＯ：８〜２５ｍｏｌ％（但し、ＭｅはＺｎ，Ｃ
ｏ，Ｎｉ，Ｃｕ，Ｍｎの少なくとも一種の二価の金属イ
オン）、又は、ＢａＯ：１５〜２８ｍｏｌ％、Ｆｅ
2Ｏ3：６５〜７５ｍｏｌ％、ＣｏＯ：５〜１５ｍｏｌ％
で示されるフェロックスプレーナー型フェライトにおい
て、ＳｉＯ2を０.０５〜０.５ｗｔ％、ＣａＯを０.０５
〜０.５ｗｔ％含有することを特徴とするフェロックス
プレーナー型フェライトが得られる。According to the present invention, Ba
O: 10~30mol%, Fe 2 O 3: 56~65mol
%, MeO: 8 to 25 mol% (however, Me is Zn, C
o, Ni, Cu, Mn at least one divalent metal ion), or BaO: 15 to 28 mol%, Fe
2 O 3 : 65-75 mol%, CoO: 5-15 mol%
In the ferlock sprayer type ferrite shown by, SiO 2 is 0.05 to 0.5 wt% and CaO is 0.05.
Ferroc sprayer type ferrite characterized by containing ~ 0.5 wt% is obtained.
【０００６】本発明者は、上述したフェロックスプレー
ナー型フェライトの欠点を解消すべく、透磁率の高周波
での減衰の原因、及びその改善方法について鋭意検討の
結果、本発明をなすにいたった。In order to eliminate the above-mentioned drawbacks of the Ferroc sprayer type ferrite, the inventor of the present invention has completed the present invention as a result of extensive studies on the cause of the attenuation of the magnetic permeability at a high frequency and the improvement method thereof.
【０００７】フェロックスプレーナー型フェライトは、
比抵抗が数千Ωｃｍ程度と低く、誘電率が数百程度と高
いため、高周波では渦電流損失により透磁率が減衰して
しまう。これにＳｉＯ2とＣａＯを含有させると、Ｓｉ
Ｏ2とＣａＯは選択的に粒界に析出し、高抵抗、かつ、
低誘電率のガラス層を形成する。そのため、高周波での
渦電流の損失が抑制され、透磁率の高周波特性が改善さ
れる。Ferroc sprayer type ferrite is
Since the specific resistance is as low as several thousand Ωcm and the dielectric constant is as high as several hundreds, the magnetic permeability is attenuated due to eddy current loss at high frequencies. When SiO 2 and CaO are added to this, Si
O 2 and CaO are selectively precipitated at the grain boundaries, have high resistance, and
A low dielectric constant glass layer is formed. Therefore, the loss of eddy current at high frequencies is suppressed, and the high frequency characteristics of magnetic permeability are improved.
【０００８】又、渦電流損失抑制には、結晶粒径を均一
にすることも有効であるが、ＳｉＯ2とＣａＯが粒界に
析出することで、異常粒成長を抑制し、結晶粒径を均一
にする作用もある。In order to suppress the eddy current loss, it is also effective to make the crystal grain size uniform. However, the precipitation of SiO 2 and CaO at the grain boundaries suppresses abnormal grain growth and suppresses the crystal grain size. It also has the effect of making it uniform.
【０００９】ここで、ＳｉＯ2とＣａＯの添加量を上述
の範囲に限定した理由は、ＳｉＯ2が０.０５ｗｔ％以
下、ＣａＯが０.０５ｗｔ％以下では、ガラス層を形成
するには不十分で、効果が見られず、ＳｉＯ2が０.５ｗ
ｔ％以上、ＣａＯが０.５ｗｔ％以上では、ガラス層は
形成するが、磁性を持つフェロックスプレーナー型フェ
ライトの主層の占める割合が減少し、透磁率の絶対値が
低下してしまうためである。The reason why the addition amounts of SiO 2 and CaO are limited to the above ranges is that SiO 2 is not more than 0.05 wt% and CaO is not more than 0.05 wt% is insufficient for forming a glass layer. And the effect is not seen, and SiO 2 is 0.5w
When the content is t% or more and the CaO content is 0.5 wt% or more, the glass layer is formed, but the proportion of the main layer of the ferroscopic sprayer type ferrite having magnetism decreases, and the absolute value of the magnetic permeability decreases. is there.
【００１０】本発明のフェロックスプレーナー型フェラ
イトの組成を、ＢａＯ：１０〜３０ｍｏｌ％、Ｆｅ
2Ｏ3：５６〜６５ｍｏｌ％、ＭｅＯ：８〜２５ｍｏｌ％
（但し、ＭｅはＺｎ，Ｃｏ，Ｎｉ，Ｃｕ，Ｍｎの少なく
とも一種の二価の金属イオン）とした理由は、フェロッ
クスプレーナー型フェライトの中でも高い透磁率を有す
るＢａ2Ｍｅ2Ｆｅ12Ｏ22で示されるＹ型構造のフェライ
ト相が、ほぼ単相で得られるためである。Ｍｅを二価の
金属イオンとした理由は、Ｙ型のフェロックスプレーナ
ー構造を得るための必要条件であるためである。Ｍｅを
Ｚｎ，Ｃｏ，Ｎｉ，Ｃｕ，Ｍｎの少なくとも一種の二価
の金属イオンとした理由は、これらの金属イオンであれ
ば、大きな透磁率が得られるためである。なお、これら
の金属イオンは、一種でも組み合わせても良く、必要と
する透磁率とその周波数特性に応じて選択される。The composition of the ferrite of the present invention is as follows: BaO: 10-30 mol%, Fe
2 O 3 : 56-65 mol%, MeO: 8-25 mol%
(However, Me is at least one divalent metal ion of Zn, Co, Ni, Cu, Mn) because Ba 2 Me 2 Fe 12 O 22 which has a high magnetic permeability among ferroscopic sprayer type ferrites. This is because the ferrite phase having the Y-type structure shown is obtained as a substantially single phase. The reason for using Me as a divalent metal ion is that it is a necessary condition for obtaining a Y-type ferlock sprayer structure. The reason that Me is at least one divalent metal ion of Zn, Co, Ni, Cu, and Mn is that a large magnetic permeability can be obtained with these metal ions. These metal ions may be used alone or in combination, and are selected according to the required magnetic permeability and the frequency characteristic thereof.
【００１１】又、本発明のフェロックスプレーナー型フ
ェライトの組成を、ＢａＯ：１５〜２８ｍｏｌ％、Ｆｅ
2Ｏ3：６５〜７５ｍｏｌ％、ＣｏＯ：５〜１５ｍｏｌ％
とした理由は、フェロックスプレーナー型フェライトの
中でも高い透磁率のＢａ3Ｃｏ2Ｆｅ24Ｏ41で示されるＺ
型構造のフェライト相が、ほぼ単相で得られるためであ
る。The composition of the ferrite block sprayer type ferrite of the present invention is BaO: 15 to 28 mol%, Fe
2 O 3 : 65-75 mol%, CoO: 5-15 mol%
The reason for this is that among the Ferroc sprayer type ferrites, Z having a high magnetic permeability, Ba 3 Co 2 Fe 24 O 41 , is used.
This is because the ferrite phase of the mold structure can be obtained as a substantially single phase.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態を実施
例を用いて詳述する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to examples.
【００１３】（実施例１、比較例１）高純度のＦｅ
2Ｏ3，ＢａＣＯ3，ＺｎＯをＦｅ2Ｏ3，ＢａＯ，ＺｎＯ
換算として、表１に示す組成となるように秤量し、秤量
した原料に、水、分散剤を加え、ボールミルで混合し、
濾過した。次に、得られた粉末を１３００℃で予焼を行
った。この粉末に対して、ＣａＯ換算で０.２５ｗｔ％
のＣａ（ＯＨ）2と０.２ｗｔ％のＳｉＯ2を加え、ボー
ルミルにて解砕し、バインダーを加え、スプレードライ
ヤーにて造粒粉末を得た。この粉末を外径１２ｍｍ、内
径８ｍｍ、高さ４ｍｍのリング形状に成形した。この成
形体を１２５０℃の温度に４時間保持して焼結した。こ
のリング状の焼結体を測定試料として１ＭＨｚにおける
透磁率μ(1MH z)を測定した。その結果を表１に示す。本
発明のＢａＯ，Ｆｅ2Ｏ3，ＺｎＯの範囲内（備考欄に本
発明の範囲内、範囲外の別を記載している）での透磁率
が、範囲外と比較して大きいことがわかる。(Example 1, Comparative Example 1) High-purity Fe
2 O 3 , BaCO 3 , ZnO to Fe 2 O 3 , BaO, ZnO
In terms of conversion, the ingredients are weighed so as to have the composition shown in Table 1, water and a dispersant are added to the weighed raw materials, and the ingredients are mixed in a ball mill.
Filtered. Next, the obtained powder was pre-baked at 1300 ° C. 0.25wt% in CaO conversion to this powder
Ca (OH) 2 and 0.2 wt% of SiO 2 were added, the mixture was crushed with a ball mill, a binder was added, and a granulated powder was obtained with a spray dryer. This powder was formed into a ring shape having an outer diameter of 12 mm, an inner diameter of 8 mm and a height of 4 mm. The compact was held at a temperature of 1250 ° C. for 4 hours for sintering. Using this ring-shaped sintered body as a measurement sample, the magnetic permeability μ ( 1 MHz ) at 1 MHz was measured. Table 1 shows the results. It can be seen that the magnetic permeability in the range of BaO, Fe 2 O 3 and ZnO of the present invention (inside the range of the present invention and the outside of the range is described in the remarks column) is large as compared with the outside of the range. .
【００１４】 [0014]
【００１５】（実施例２、比較例２）高純度のＦｅ
2Ｏ3，ＢａＣＯ3，ＺｎＯをＦｅ2Ｏ3，ＢａＯ，ＺｎＯ
換算として、６０ｍｏｌ％、２０ｍｏｌ％、２０ｍｏｌ
％となるように秤量し、秤量した原料に、水、分散剤を
加え、ボールミルで混合し、濾過した。次に、得られた
粉末を１３００℃で予焼を行った。この粉末に対して、
表２に示すＣａＯ量に換算したＣａ（ＯＨ）2と、これ
も表２に示す量のＳｉＯ2を加え、ボールミルにて解砕
し、バインダーを加え、スプレードライヤーにて造粒粉
末を得た。この粉末を実施例１と同様に、成形、焼結を
行った。次に、焼結体の１ＭＨｚにおける透磁率μ
(1MHz)とその透磁率が８０％に減衰する周波数ｆ80%を
測定した。得られた結果を表２に示す。本発明のＣａ
Ｏ，ＳｉＯ2の範囲内での周波数特性が、ＣａＯ，Ｓｉ
Ｏ2の添加量が本発明よりも小さい範囲（表２中のＮｏ.
２，６，７）と比較して、高周波側での減衰が極めて小
さいことがわかる。又、本発明のＣａＯ，ＳｉＯ2の範
囲内での透磁率（μ１ＭＨｚ）の絶対値が、ＣａＯ，Ｓ
ｉＯ2の添加量が本発明よりも大きい範囲（表２中のＮ
ｏ.５，１０）と比較して、大きいことがわかる。(Example 2, Comparative Example 2) High-purity Fe
2 O 3 , BaCO 3 , ZnO to Fe 2 O 3 , BaO, ZnO
As conversion, 60 mol%, 20 mol%, 20 mol
%, And water and a dispersant were added to the weighed raw materials, mixed with a ball mill, and filtered. Next, the obtained powder was pre-baked at 1300 ° C. For this powder,
Ca (OH) 2 converted into the amount of CaO shown in Table 2 and SiO 2 in the amount also shown in Table 2 were added, crushed with a ball mill, a binder was added, and a granulated powder was obtained with a spray dryer. . This powder was molded and sintered in the same manner as in Example 1. Next, the permeability μ at 1 MHz of the sintered body
(1 MHz) and the frequency f 80% at which its magnetic permeability attenuates to 80% were measured. Table 2 shows the obtained results. Ca of the present invention
The frequency characteristics within the range of O and SiO 2 are CaO and Si.
A range in which the amount of O 2 added is smaller than that of the present invention (No.
It can be seen that the attenuation on the high frequency side is extremely small as compared with (2, 6, 7). Further, the absolute value of the magnetic permeability (μ1 MHz) within the range of CaO, SiO 2 of the present invention is CaO, S
A range where the amount of iO 2 added is larger than that of the present invention (N in Table 2
It can be seen that it is large compared with No. 5, 10).
【００１６】 [0016]
【００１７】（実施例３）実施例２で示したＺｎＯの代
わりに、Ｃｏ2Ｏ3，ＮｉＯ，ＣｕＯ，Ｍｎ3Ｏ4に、それ
ぞれ替えて、実施例１と同様に、混合、濾過、予焼を行
った。得られた粉末に対して、ＣａＯ換算で０.２５ｗ
ｔ％のＣａ（ＯＨ）2と０.２ｗｔ％のＳｉＯ2を加え、
ボールミルにて解砕し、バインダーを加え、スプレード
ライヤーにて造粒粉末を得た。この粉末を実施例１と同
様に、成形、焼結を行った。得られた焼結体について、
実施例２と同様な評価を行った。結果を表３に示す。(Example 3) Instead of ZnO shown in Example 2, Co 2 O 3 , NiO, CuO, Mn 3 O 4 were respectively replaced, and mixing, filtration and pre-treatment were carried out in the same manner as in Example 1. I baked it. 0.25w in terms of CaO for the obtained powder
Add t% Ca (OH) 2 and 0.2 wt% SiO 2 ,
It was crushed with a ball mill, a binder was added, and a granulated powder was obtained with a spray dryer. This powder was molded and sintered in the same manner as in Example 1. About the obtained sintered body,
The same evaluation as in Example 2 was performed. Table 3 shows the results.
【００１８】 [0018]
【００１９】（比較例３）実施例３でＣａ（ＯＨ）2と
ＳｉＯ2を添加しないこと以外は、同様にして、粉末を
作製し、評価した。得られた結果を表３に示す。Comparative Example 3 A powder was prepared and evaluated in the same manner as in Example 3 except that Ca (OH) 2 and SiO 2 were not added. Table 3 shows the obtained results.
【００２０】実施例３と比較例３より、本発明範囲の二
価の金属イオンでは、ＣａＯとＳｉＯ2が含有されるこ
とにより、透磁率の高周波側での減衰が小さくなってい
ることがわかる。From Example 3 and Comparative Example 3, it can be seen that the divalent metal ions within the scope of the present invention contain CaO and SiO 2 so that the attenuation of the magnetic permeability on the high frequency side is small. .
【００２１】（実施例４、比較例４）高純度のＦｅ
2Ｏ3，ＢａＣＯ3，ＣｏＯをＦｅ2Ｏ3，ＢａＯ，ＣｏＯ
換算として、表４に示す組成となるように秤量し、秤量
した原料に、水、分散剤を加え、ボールミルで混合し、
濾過した。次に、この粉末を１２５０℃で予焼を行っ
た。得られた粉末に対して、ＣａＯ換算で０.２５ｗｔ
％のＣａ（ＯＨ）2と、０.２ｗｔ％のＳｉＯ2を加え、
ボールミルにて解砕し、バインダーを加え、スプレード
ライヤーにて造粒粉末を得た。この粉末を外径１２ｍ
ｍ、内径８ｍｍ、高さ４ｍｍのリング形状に成形した。
この成形体を１２５０℃の温度に４時間保持して焼結し
た。この焼結体を測定試料として、１ＭＨｚにおける透
磁率μ(1MHz)を測定した。その結果を表４に示す。本発
明のＢａＯ，Ｆｅ2Ｏ3，ＣｏＯの範囲内での透磁率が、
範囲外と比較して、大きいことがわかる。(Example 4, Comparative Example 4) High-purity Fe
2 O 3 , BaCO 3 , CoO to Fe 2 O 3 , BaO, CoO
In terms of conversion, the ingredients were weighed so as to have the composition shown in Table 4, water and a dispersant were added to the weighed raw materials, and the ingredients were mixed in a ball mill.
Filtered. Next, this powder was pre-baked at 1250 ° C. 0.25wt% of the obtained powder in terms of CaO
% Ca (OH) 2 and 0.2 wt% SiO 2 are added,
It was crushed with a ball mill, a binder was added, and a granulated powder was obtained with a spray dryer. This powder has an outer diameter of 12 m
m, the inner diameter was 8 mm, and the height was 4 mm.
The compact was held at a temperature of 1250 ° C. for 4 hours for sintering. Using this sintered body as the measurement sample, the magnetic permeability μ (1 MHz) at 1 MHz was measured. Table 4 shows the results. The magnetic permeability in the range of BaO, Fe 2 O 3 and CoO of the present invention is
It can be seen that it is large compared to outside the range.
【００２２】 [0022]
【００２３】（実施例５、比較例５）高純度のＦｅ
2Ｏ3，ＢａＣＯ3，ＣｏＯをＦｅ2Ｏ3，ＢａＯ，ＣｏＯ
換算として、７０ｍｏｌ％、２０ｍｏｌ％、１０ｍｏｌ
％となるように秤量し、秤量した原料に、水、分散剤を
加え、ボールミルにて混合し、濾過した。次に、この粉
末を１２５０℃で予焼を行った。得られた粉末に対し
て、表５に示すＣａＯ量に換算したＣａ（ＯＨ）2と、
これも表５に示す量のＳｉＯ2を加え、ボールミルにて
解砕し、バインダーを加え、スプレードライヤーにて造
粒粉末を得た。この粉末を実施例１と同様に、成形、焼
結を行った。次に、焼結体の１ＭＨｚにおける透磁率μ
(1MHz)とその透磁率が８０％に減衰する周波数ｆ80%を
測定した。得られた結果を表５に示す。本発明のＣａ
Ｏ，ＳｉＯ2の範囲内での透磁率の周波数特性が、Ｃａ
Ｏ，ＳｉＯ2の添加量が本発明よりも小さい範囲（表５
中のＮｏ.２，６，７）と比較して、高周波側での減衰
が極めて小さいことがわかる。又、本発明のＣａＯ，Ｓ
ｉＯ2の範囲内での透磁率の絶対値が、ＣａＯ，ＳｉＯ2
の添加量が本発明よりも大きい範囲（表５中のＮｏ.
５，１０）と比較して、大きいことがわかる。(Example 5, Comparative Example 5) High-purity Fe
2 O 3 , BaCO 3 , CoO to Fe 2 O 3 , BaO, CoO
As conversion, 70 mol%, 20 mol%, 10 mol
%, And water and a dispersant were added to the weighed raw materials, mixed by a ball mill, and filtered. Next, this powder was pre-baked at 1250 ° C. With respect to the obtained powder, Ca (OH) 2 converted into the amount of CaO shown in Table 5, and
The amount of SiO 2 shown in Table 5 was also added, the mixture was crushed with a ball mill, the binder was added, and a granulated powder was obtained with a spray dryer. This powder was molded and sintered in the same manner as in Example 1. Next, the permeability μ at 1 MHz of the sintered body
(1 MHz) and the frequency f 80% at which its magnetic permeability attenuates to 80% were measured. Table 5 shows the obtained results. Ca of the present invention
The frequency characteristic of magnetic permeability within the range of O and SiO 2 is Ca
A range in which the amounts of O and SiO 2 added are smaller than those of the present invention (Table 5
It can be seen that the attenuation on the high frequency side is extremely small as compared with Nos. 2, 6, 7) in the inside. In addition, CaO, S of the present invention
The absolute value of the magnetic permeability within the range of iO 2 is CaO, SiO 2
In the range where the addition amount of is larger than in the present invention (No.
It can be seen that it is large as compared with 5, 10).
【００２４】 [0024]
【００２５】[0025]
【発明の効果】以上、述べたように、本発明によれば、
透磁率の高周波特性が大幅に改善されたフェロックスプ
レーナー型の軟磁性六方晶フェライトが得られ、近年の
電子機器の高周波化に対して有効な軟磁性材料として、
工業上、極めて重要である。As described above, according to the present invention,
Ferroc sprayer type soft magnetic hexagonal ferrite with greatly improved high frequency characteristics of magnetic permeability is obtained, and as a soft magnetic material effective for high frequency electronic devices in recent years,
It is extremely important industrially.
Claims (2)
2Ｏ3：５６〜６５ｍｏｌ％、ＭｅＯ：８〜２５ｍｏｌ％
（但し、ＭｅはＺｎ，Ｃｏ，Ｎｉ，Ｃｕ，Ｍｎの少なく
とも一種の二価の金属イオン）を主成分とし、前記主成
分に対し、ＳｉＯ2を０.０５〜０.５ｗｔ％、ＣａＯを
０.０５〜０.５ｗｔ％含有したことを特徴とする軟磁性
六方晶フェライト。1. BaO: 10 to 30 mol%, Fe
2 O 3 : 56-65 mol%, MeO: 8-25 mol%
(However, Me is at least one divalent metal ion of Zn, Co, Ni, Cu, and Mn) as a main component, and SiO 2 is 0.05 to 0.5 wt% and CaO is 0 based on the main component. A soft magnetic hexagonal ferrite characterized by containing 0.05 to 0.5 wt%.
2Ｏ3：６５〜７５ｍｏｌ％、ＣｏＯ：５〜１５ｍｏｌ％
を主成分とし、前記主成分に対し、ＳｉＯ2を０.０５〜
０.５ｗｔ％、ＣａＯを０.０５〜０.５ｗｔ％含有した
ことを特徴とする軟磁性六方晶フェライト。2. BaO: 15-28 mol%, Fe
2 O 3 : 65-75 mol%, CoO: 5-15 mol%
Is used as a main component, and SiO 2 is added to the main component in an amount of 0.05 to
Soft magnetic hexagonal ferrite characterized by containing 0.5 wt% and CaO of 0.05 to 0.5 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7308281A JPH09129433A (en) | 1995-10-31 | 1995-10-31 | Soft magnetic hexagonal ferrite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7308281A JPH09129433A (en) | 1995-10-31 | 1995-10-31 | Soft magnetic hexagonal ferrite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09129433A true JPH09129433A (en) | 1997-05-16 |
Family
ID=17979152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7308281A Pending JPH09129433A (en) | 1995-10-31 | 1995-10-31 | Soft magnetic hexagonal ferrite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09129433A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002260911A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| JP2002260912A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| JP2002260913A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| JP2002260914A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| EP1707536A2 (en) | 2005-03-31 | 2006-10-04 | Hitachi Metals, Ltd. | Ferrite sintered body and method of manufacturing same |
| JP2007119321A (en) * | 2005-10-31 | 2007-05-17 | Hitachi Metals Ltd | Ferrite sintered compact and method of manufacturing the same |
-
1995
- 1995-10-31 JP JP7308281A patent/JPH09129433A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002260911A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| JP2002260912A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| JP2002260913A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| JP2002260914A (en) * | 2001-03-01 | 2002-09-13 | Tdk Corp | Sintered magnetic oxide and high-frequency circuit part using the same |
| EP1707536A2 (en) | 2005-03-31 | 2006-10-04 | Hitachi Metals, Ltd. | Ferrite sintered body and method of manufacturing same |
| JP2006306693A (en) * | 2005-03-31 | 2006-11-09 | Hitachi Metals Ltd | Ferrite sintered body and method for manufacturing same |
| US7390425B2 (en) | 2005-03-31 | 2008-06-24 | Hitachi Metals, Ltd. | Ferrite sintered body and method of manufacturing same |
| JP4683327B2 (en) * | 2005-03-31 | 2011-05-18 | 日立金属株式会社 | Ferrite sintered body and manufacturing method thereof |
| JP2007119321A (en) * | 2005-10-31 | 2007-05-17 | Hitachi Metals Ltd | Ferrite sintered compact and method of manufacturing the same |
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