JPH09165220A - Manganese-zinc ferrite having high magnetic permeability - Google Patents
Manganese-zinc ferrite having high magnetic permeabilityInfo
- Publication number
- JPH09165220A JPH09165220A JP8062271A JP6227196A JPH09165220A JP H09165220 A JPH09165220 A JP H09165220A JP 8062271 A JP8062271 A JP 8062271A JP 6227196 A JP6227196 A JP 6227196A JP H09165220 A JPH09165220 A JP H09165220A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic permeability
- temperature
- ferrite
- high magnetic
- permeability
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高透磁率で温度特性の
優れたＭｎ―Ｚｎ系フェライトに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to Mn--Zn type ferrite having high magnetic permeability and excellent temperature characteristics.
【０００２】[0002]
【従来の技術】高透磁率を有するＭｎ―Ｚｎ系フェライ
トはＦｅ2Ｏ3、ＺｎＯ、ＭｎＯを主成分として構成さ
れ、この主成分に対し、種々の添加物（Ｃａ、Ｓｉ、
Ｖ、Ｂｉ）を加えた材料となっていた。このＭｎ―Ｚｎ
系フェライトは、トランスやノイズフィルタ等の磁心と
して用いられ、高透磁率特性を利用して部品の小型化が
進められている。2. Description of the Related Art Mn--Zn ferrites having high magnetic permeability are mainly composed of Fe 2 O 3 , ZnO and MnO, and various additives (Ca, Si,
V, Bi) was added to the material. This Mn-Zn
The system ferrite is used as a magnetic core of a transformer, a noise filter, and the like, and the miniaturization of components is being promoted by utilizing high magnetic permeability characteristics.
【０００３】[0003]
【発明が解決しようとする課題】例えばＩＳＤＮのＳ／
Ｔ点インターフェースに使用するパルストランスでは、
その回線側のインダクタンスを２０ｍＨ確保すること
が、ＣＣＩＴＴ Ｉ・４３０に定めるインピーダンスマ
スクを満足するための必須条件となる。ここで、その使
用される機器を考えると、公衆電話や回線終端装置（Ｄ
ＳＵ）のように屋外や軒下に設置されるものが考えら
れ、その環境条件は、ＬＳＩでは現在−１０〜７０℃が
保証されており、同様にパルストランスにおいても温度
保証が必要となる。ところが、従来のＭｎ―Ｚｎ系高透
磁率フェライトの場合、低温側（２０℃以下）で初透磁
率が著しく低下し、この環境条件下で設計すると低温側
でのインピーダンス規格を満足するために、巻数を増や
したり、必要以上に高い透磁率の材料を用いるといった
様に非常に非効率になるという問題点があった。本発明
は、上記の事を鑑みて、高透磁率で温度特性の優れたＭ
ｎ―Ｚｎ系フェライトを得ることを目的とする。For example, ISDN S /
In the pulse transformer used for the T point interface,
Ensuring the line side inductance of 20 mH is an essential condition for satisfying the impedance mask defined in CCITT I.430. Here, considering the equipment used, public telephones and line termination devices (D
(SU) is considered to be installed outdoors or under the eaves, and its environmental condition is currently guaranteed at −10 to 70 ° C. in the LSI, and similarly, temperature guarantee is also required in the pulse transformer. However, in the case of the conventional Mn-Zn-based high magnetic permeability ferrite, the initial magnetic permeability is remarkably reduced on the low temperature side (20 ° C. or less), and if designed under this environmental condition, the impedance standard on the low temperature side is satisfied. There has been a problem that the number of turns is increased and a material having a magnetic permeability higher than necessary is used, which is very inefficient. In view of the above, the present invention provides M having high magnetic permeability and excellent temperature characteristics.
The purpose is to obtain an n-Zn ferrite.
【０００４】[0004]
【課題を解決するための手段】本発明はＭｎ―Ｚｎ系フ
ェライトにおいて、Ｆｅ2Ｏ3が５２．５〜５３．０モル
％、ＺｎＯが２２〜２５モル％、残ＭｎＯであり、初透
磁率μｉが温度−２０〜１００℃の範囲で８０００以上
で、かつその変化率が７０％以内であることを特徴とす
る高透磁率Ｍｎ―Ｚｎ系フェライトである。本発明は上
記Ｍｎ―Ｚｎ系フェライトにおいて、初透磁率μｉの温
度特性でμｉのセカンダリーピーク（Ｔｓ）が−２５〜
１０℃の範囲にある事を特徴とする高透磁率Ｍｎ―Ｚｎ
系フェライトである。また、本発明では、前記変化率が
４０％以内のものを得ることもできる。また本発明は、
副成分としてＣａＯを０．０５重量％以下、ＳｉＯ2を
０．０１重量％以下、Ｖ2Ｏ5を０．０５重量％以下、Ｂ
ｉ2Ｏ3を０．１重量％以下含有していても良い。本発明
において、主成分を限定した理由は、Ｆｅ2Ｏ3が５３モ
ル％以上になると初透磁率μｉの温度特性でセカンダリ
ーピーク（Ｔｓ）がマイナス側となり、室温付近での初
透磁率μｉが８０００以上を得られない。またＦｅ2Ｏ3
が５２．５モル％以下になるとセカンダリーピークが高
温側となりマイナス側でのμｉが８０００以上を得られ
ないからである。SUMMARY OF THE INVENTION The present invention is in the Mn-Zn ferrite, Fe 2 O 3 is from 52.5 to 53.0 mol%, ZnO is 22 to 25 mol%, a residual MnO, initial permeability μi is a high magnetic permeability Mn—Zn based ferrite, wherein μi is 8000 or more in a temperature range of −20 to 100 ° C., and its change rate is within 70%. According to the present invention, in the above Mn—Zn-based ferrite, the secondary magnetic permeability (Ts) of μi is −25 to −25 in the temperature characteristic of the initial magnetic permeability μi.
High permeability Mn-Zn characterized by being in the range of 10 ° C
It is a system ferrite. Further, in the present invention, it is also possible to obtain the above-mentioned change rate within 40%. The present invention also provides
As subcomponents, CaO is 0.05% by weight or less, SiO 2 is 0.01% by weight or less, V 2 O 5 is 0.05% by weight or less, B
It may contain 0.1% by weight or less of i 2 O 3 . In the present invention, the reason why the main component is limited is that when Fe 2 O 3 is 53 mol% or more, the secondary peak (Ts) becomes negative in the temperature characteristic of the initial permeability μi, and the initial permeability μi near room temperature is I can't get over 8,000. Fe 2 O 3
Is less than 52.5 mol%, the secondary peak is on the high temperature side, and μi on the negative side cannot be 8,000 or more.
【０００５】[0005]
実施例１ Ｆｅ2Ｏ3、ＭｎＯ、ＺｎＯを表１に示す様な主成分組成
をもつ原料を作製し、これを８５０℃で２時間仮焼、そ
の後ボールミルで８時間粉砕し、リング状に圧縮成形し
て１３６０℃で５時間、酸素濃度５％で焼成した。表１
には、異なった主成分組成をもつ試料の周波数１０ｋＨ
ｚにおける各温度下での初透磁率μｉと温度−２０から
１００℃の範囲におけるμｉの変化率（△μｉ／μｉ）
を示す。また、２０℃でのｔａｎδ／μｉとμｉの温度
特性のセカンダリーピーク（Ｔｓ）も併記する。この表
１において、本発明の範囲内のものは実施例とし、範囲
外のものは比較例としている。また、試料Ｎｏ．２（実
施例２）と試料Ｎｏ．１３（比較例５）との初透磁率μ
ｉの温度に対する変化のグラフを図１に示す。この図１
からもわかるとおり本発明の実施例は、温度−２０℃、
２０℃、１００℃の各温度において、μｉが８０００以
上と高透磁率を有しており、しかもその−２０℃〜１０
０℃の間でμｉの変化率が７０％以下であり、高透磁率
でしかも温度に対する初透磁率の変化が小さい材料であ
ることがわかる。Example 1 A raw material having a main component composition of Fe 2 O 3 , MnO, and ZnO as shown in Table 1 was prepared, calcined at 850 ° C. for 2 hours, and then pulverized by a ball mill for 8 hours and compressed into a ring. It was molded and fired at 1360 ° C. for 5 hours at an oxygen concentration of 5%. Table 1
The frequency of samples with different principal component composition is 10 kHz.
The initial permeability μi at each temperature in z and the change rate of μi in the temperature range of −20 to 100 ° C. (Δμi / μi)
Is shown. Further, the secondary peak (Ts) of the temperature characteristics of tan δ / μi and μi at 20 ° C. is also shown. In Table 1, those within the scope of the present invention are examples, and those outside the scope are comparative examples. In addition, the sample No. 2 (Example 2) and sample no. 13 (Comparative Example 5) with initial magnetic permeability μ
A graph of the change of i with temperature is shown in FIG. This figure 1
As can be seen from the above, the embodiment of the present invention has a temperature of −20 ° C.
At each temperature of 20 ° C. and 100 ° C., μi has a high magnetic permeability of 8000 or more, and its −20 ° C. to 10 ° C.
It can be seen that the rate of change of μi is 70% or less at 0 ° C., which is a material having a high magnetic permeability and a small change in the initial magnetic permeability with respect to temperature.
【０００６】[0006]
【表１】 [Table 1]
【０００７】実施例２ Ｆｅ2Ｏ3 ５２．６モル％、ＭｎＯ ２２．９モル％、
ＺｎＯ ２４．５モル％を主成分とし、これにＣａＯ、
ＳｉＯ2、Ｖ2Ｏ5、Ｂｉ2Ｏ3を表２に示す分量含有する
原料を作製し、これを８５０℃で２時間仮焼、その後ボ
ールミルで８時間粉砕し、リング状に圧縮成形して１３
６０℃で５時間、酸素濃度５％で焼成した。その試料に
ついても実施例１と同様、周波数１００ｋＨｚにおける
各温度下でのμｉとμｉの変化率を表２に示す。また、
周波数３００ｋＨｚにおけるμｉも併記する。この表２
に示すように、本発明の実施例は、μｉの周波数特性も
優れている。尚、ＣａＯが０．０６重量％となると、−
２０℃でのμｉが低下した。又、ＳｉＯ2が０．０１３
重量％となると−２０℃でのμｉが低下した。又、Ｂｉ
2Ｏ3が０．１２重量％となると、−２０℃でのμｉが低
下した。Example 2 Fe 2 O 3 52.6 mol%, MnO 22.9 mol%,
24.5 mol% of ZnO as a main component, and CaO,
A raw material containing SiO 2 , V 2 O 5 , and Bi 2 O 3 in the amounts shown in Table 2 was prepared, calcined at 850 ° C. for 2 hours, pulverized by a ball mill for 8 hours, and compression-molded into a ring. 13
Calcination was performed at 60 ° C. for 5 hours at an oxygen concentration of 5%. Table 2 also shows μi and the rate of change of μi at each temperature at a frequency of 100 kHz, as in Example 1. Also,
Μi at a frequency of 300 kHz is also shown. This Table 2
As shown in the above, the embodiment of the present invention also has excellent frequency characteristics of μi. When CaO becomes 0.06% by weight,-
Μi at 20 ° C. decreased. In addition, SiO 2 is 0.013
%, The μi at −20 ° C. decreased. Also, Bi
When the content of 2 O 3 was 0.12% by weight, μi at −20 ° C. decreased.
【０００８】[0008]
【表２】 [Table 2]
【０００９】[0009]
【発明の効果】本発明によれば、低温側（−２０℃）か
ら高温側（１００℃）まで高い透磁率を有し、しかも、
その温度差で透磁率の変化率が小さいＭｎ―Ｚｎ系フェ
ライトを得ることができる。According to the present invention, it has a high magnetic permeability from the low temperature side (-20 ° C) to the high temperature side (100 ° C), and
Due to the temperature difference, it is possible to obtain Mn—Zn based ferrite having a small change rate of magnetic permeability.
【図１】本発明に係る実施例と比較例との初透磁率μｉ
の温度特性である。FIG. 1 shows an initial magnetic permeability μi of an example according to the present invention and a comparative example.
Is the temperature characteristic.
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成９年３月１１日[Submission date] March 11, 1997
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 高透磁率Ｍｎ―Ｚｎ系フェライトTitle of invention High permeability Mn-Zn ferrite
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、高透磁率で温度特性の
優れたＭｎ―Ｚｎ系フェライトに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to Mn--Zn type ferrite having high magnetic permeability and excellent temperature characteristics.
【０００２】[0002]
【従来の技術】高透磁率を有するＭｎ―Ｚｎ系フェライ
トはＦｅ2Ｏ3、ＺｎＯ、ＭｎＯを主成分として構成さ
れ、この主成分に対し、種々の添加物（Ｃａ、Ｓｉ、
Ｖ、Ｂｉ）を加えた材料となっていた。このＭｎ―Ｚｎ
系フェライトは、トランスやノイズフィルタ等の磁心と
して用いられ、高透磁率特性を利用して部品の小型化が
進められている。2. Description of the Related Art Mn--Zn ferrites having high magnetic permeability are mainly composed of Fe 2 O 3 , ZnO and MnO, and various additives (Ca, Si,
V, Bi) was added to the material. This Mn-Zn
The system ferrite is used as a magnetic core of a transformer, a noise filter, and the like, and the miniaturization of components is being promoted by utilizing high magnetic permeability characteristics.
【０００３】[0003]
【発明が解決しようとする課題】例えばＩＳＤＮのＳ／
Ｔ点インターフェースに使用するパルストランスでは、
その回線側のインダクタンスを２０ｍＨ確保すること
が、ＣＣＩＴＴ Ｉ・４３０に定めるインピーダンスマ
スクを満足するための必須条件となる。ここで、その使
用される機器を考えると、公衆電話や回線終端装置（Ｄ
ＳＵ）のように屋外や軒下に設置されるものが考えら
れ、その環境条件は、ＬＳＩでは現在−１０〜７０℃が
保証されており、同様にパルストランスにおいても温度
保証が必要となる。ところが、従来のＭｎ―Ｚｎ系高透
磁率フェライトの場合、低温側（２０℃以下）で初透磁
率が著しく低下し、この環境条件下で設計すると低温側
でのインピーダンス規格を満足するために、巻数を増や
したり、必要以上に高い透磁率の材料を用いるといった
様に非常に非効率になるという問題点があった。本発明
は、上記の事を鑑みて、高透磁率で温度特性の優れたＭ
ｎ―Ｚｎ系フェライトを得ることを目的とする。For example, ISDN S /
In the pulse transformer used for the T point interface,
Ensuring the line side inductance of 20 mH is an essential condition for satisfying the impedance mask defined in CCITT I.430. Here, considering the equipment used, public telephones and line termination devices (D
(SU) is considered to be installed outdoors or under the eaves, and its environmental condition is currently guaranteed at −10 to 70 ° C. in the LSI, and similarly, temperature guarantee is also required in the pulse transformer. However, in the case of the conventional Mn-Zn-based high magnetic permeability ferrite, the initial magnetic permeability is remarkably reduced on the low temperature side (20 ° C. or less), and if designed under this environmental condition, the impedance standard on the low temperature side is satisfied. There has been a problem that the number of turns is increased and a material having a magnetic permeability higher than necessary is used, which is very inefficient. In view of the above, the present invention provides M having high magnetic permeability and excellent temperature characteristics.
The purpose is to obtain an n-Zn ferrite.
【０００４】[0004]
【課題を解決するための手段】本発明はＭｎ―Ｚｎ系フ
ェライトにおいて、Ｆｅ2Ｏ3が５２．５〜５３．０モル
％、ＺｎＯが２２〜２５モル％、残ＭｎＯであり、初透
磁率μｉの温度特性でμｉのセカンダリーピーク（Ｔ
ｓ）が−２５〜１０℃の範囲にある事を特徴とする高透
磁率Ｍｎ―Ｚｎ系フェライトである。本発明のＭｎ―Ｚ
ｎ系フェライトによれば、温度−２０〜１００℃で、初
透磁率μｉが８０００以上の高透磁率を得ることができ
る。しかも、温度−２０〜１００℃で、初透磁率μｉの
変化率も７０％以下となる優れた温度安定性を兼ね備え
ている。 SUMMARY OF THE INVENTION The present invention is in the Mn-Zn ferrite, Fe 2 O 3 is from 52.5 to 53.0 mol%, ZnO is 22 to 25 mol%, a residual MnO, initial
The secondary peak of μi (T
s) is in the range of -25 to 10 ° C, which is a high magnetic permeability Mn-Zn ferrite. Mn-Z of the present invention
According to the n-type ferrite, at a temperature of -20 to 100 ° C,
It is possible to obtain a high magnetic permeability with a magnetic permeability μi of 8000 or more.
You. Moreover, at a temperature of −20 to 100 ° C., the initial magnetic permeability μi
Combines excellent temperature stability with a change rate of 70% or less
ing.
【０００５】また本発明は、副成分としてＣａＯを０．
０５重量％以下、ＳｉＯ2を０．０１重量％以下、Ｖ2Ｏ
5を０．０５重量％以下、Ｂｉ2Ｏ3を０．１重量％以下
含有していても良い。本発明において、主成分を限定し
た理由は、Ｆｅ2Ｏ3が５３モル％を越えると初透磁率μ
ｉの温度特性でセカンダリーピーク（Ｔｓ）がマイナス
側となり、室温付近での初透磁率μｉが８０００以上を
得られない。またＦｅ2Ｏ3が５２．５モル％未満になる
とセカンダリーピークが高温側となりマイナス側でのμ
ｉが８０００以上を得られないからである。一方、Ｚｎ
Ｏが２５モル％を越えると、キュリー温度（Ｔｃ）が１
００℃付近まで低下して温度保証帯域が狭くなるため、
望ましくない。さらに、ＺｎＯが２２モル％未満となる
と、キュリー温度が高くなり、温度特性カーブのうねり
が大きくなるのに伴い、−２０〜０℃においてμｉが８
０００以上を得られないからである。 Further, according to the present invention, CaO is added as a sub-component.
05 wt% or less, the SiO 2 0.01 wt% or less, V 2 O
5 may be contained at 0.05% by weight or less, and Bi 2 O 3 may be contained at 0.1% by weight or less. In the present invention, the main component is limited because the initial magnetic permeability μ when Fe 2 O 3 exceeds 53 mol%.
In the temperature characteristic of i, the secondary peak (Ts) is on the negative side, and the initial permeability μi near room temperature cannot be 8,000 or more. When Fe 2 O 3 is less than 52.5 mol%, the secondary peak becomes the high temperature side and μ on the negative side.
This is because i cannot be 8,000 or more. On the other hand, Zn
When O exceeds 25 mol%, the Curie temperature (Tc) is 1
Since the temperature guarantee band becomes narrower as the temperature drops to around 00 ° C,
Not desirable. Further, ZnO is less than 22 mol%
When the Curie temperature rises, the swell of the temperature characteristic curve
Becomes larger, μi becomes 8 at -20 to 0 ° C.
This is because you cannot get more than 000.
【０００６】[0006]
【実施例】 実施例１ Ｆｅ2Ｏ3、ＭｎＯ、ＺｎＯを表１に示す様な主成分組成
をもつ原料を作製し、これを８５０℃で２時間仮焼、そ
の後ボールミルで８時間粉砕し、リング状に圧縮成形し
て１３６０℃で５時間、酸素濃度５％で焼成した。表１
には、異なった主成分組成をもつ試料の周波数１０ｋＨ
ｚにおける各温度下での初透磁率μｉと温度−２０から
１００℃の範囲におけるμｉの変化率（△μｉ／μｉ）
を示す。また、２０℃でのｔａｎδ／μｉとμｉの温度
特性のセカンダリーピーク（Ｔｓ）も併記する。この表
１において、本発明の範囲内のものは実施例とし、範囲
外のものは比較例としている。また、試料Ｎｏ．２（実
施例２）と試料Ｎｏ．１３（比較例５）との初透磁率μ
ｉの温度に対する変化のグラフを図１に示す。この図１
からもわかるとおり本発明の実施例は、温度−２０℃、
２０℃、１００℃の各温度において、μｉが８０００以
上と高透磁率を有しており、しかもその−２０℃〜１０
０℃の間でμｉの変化率が７０％以下であり、高透磁率
でしかも温度に対する初透磁率の変化が小さい材料であ
ることがわかる。 Example 1 A raw material of Fe 2 O 3 , MnO, and ZnO having a main component composition as shown in Table 1 was prepared, calcined at 850 ° C. for 2 hours, and then pulverized by a ball mill for 8 hours. It was compression molded into a ring shape and baked at 1360 ° C. for 5 hours at an oxygen concentration of 5%. Table 1
The frequency of samples with different principal component composition is 10 kHz.
The initial permeability μi at each temperature in z and the change rate of μi in the temperature range of −20 to 100 ° C. (Δμi / μi)
Is shown. Further, the secondary peak (Ts) of the temperature characteristics of tan δ / μi and μi at 20 ° C. is also shown. In Table 1, those within the scope of the present invention are examples, and those outside the scope are comparative examples. In addition, the sample No. 2 (Example 2) and sample no. 13 (Comparative Example 5) with initial magnetic permeability μ
A graph of the change of i with temperature is shown in FIG. This figure 1
As can be seen from the above, the embodiment of the present invention has a temperature of −20 ° C.
At each temperature of 20 ° C. and 100 ° C., μi has a high magnetic permeability of 8000 or more, and its −20 ° C. to 10 ° C.
It can be seen that the rate of change of μi is 70% or less at 0 ° C., which is a material having a high magnetic permeability and a small change in the initial magnetic permeability with respect to temperature.
【０００７】[0007]
【表１】 [Table 1]
【０００８】[0008]
【発明の効果】本発明によれば、低温側（−２０℃）か
ら高温側（１００℃）まで高い透磁率を有し、しかも、
その温度差で透磁率の変化率が小さいＭｎ―Ｚｎ系フェ
ライトを得ることができる。According to the present invention, it has a high magnetic permeability from the low temperature side (-20 ° C) to the high temperature side (100 ° C), and
Due to the temperature difference, it is possible to obtain Mn—Zn based ferrite having a small change rate of magnetic permeability.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に係る実施例と比較例との初透磁率μｉ
の温度特性である。FIG. 1 shows an initial magnetic permeability μi of an example according to the present invention and a comparative example.
Is the temperature characteristic.
Claims (2)
2Ｏ3が５２．５〜５３．０モル％、ＺｎＯが２２〜２５
モル％、残ＭｎＯであり、初透磁率μｉが温度−２０〜
１００℃の範囲で８０００以上で、かつその変化率が７
０％以内である事を特徴とする高透磁率Ｍｎ―Ｚｎ系フ
ェライト。1. An Mn—Zn ferrite comprising Fe
2 O 3 is 52.5 to 53.0 mol%, ZnO is 22 to 25
Mol%, residual MnO, and the initial permeability μ
8000 or more in the range of 100 ° C. and the rate of change is 7
High magnetic permeability Mn-Zn ferrite characterized by being within 0%.
ライトにおいて、初透磁率μｉの温度特性でμｉのセカ
ンダリーピーク（Ｔｓ）が−２５〜１０℃の範囲にある
事を特徴とする高透磁率Ｍｎ―Ｚｎ系フェライト。2. The Mn—Zn-based ferrite according to claim 1, wherein a secondary peak (Ts) of μi in a temperature characteristic of an initial magnetic permeability μi is in a range of −25 to 10 ° C. Magnetic permeability Mn-Zn ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8062271A JPH09165220A (en) | 1996-03-19 | 1996-03-19 | Manganese-zinc ferrite having high magnetic permeability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8062271A JPH09165220A (en) | 1996-03-19 | 1996-03-19 | Manganese-zinc ferrite having high magnetic permeability |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5070988A Division JP2907253B2 (en) | 1993-03-05 | 1993-03-05 | High permeability Mn-Zn ferrite |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9056699A Division JPH1072217A (en) | 1997-03-11 | 1997-03-11 | High permeability mn-zn ferrite and pulse transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09165220A true JPH09165220A (en) | 1997-06-24 |
Family
ID=13195328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8062271A Pending JPH09165220A (en) | 1996-03-19 | 1996-03-19 | Manganese-zinc ferrite having high magnetic permeability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09165220A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6217789B1 (en) | 1997-03-13 | 2001-04-17 | Tdk Corporation | Mn-Zn system ferrite |
-
1996
- 1996-03-19 JP JP8062271A patent/JPH09165220A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6217789B1 (en) | 1997-03-13 | 2001-04-17 | Tdk Corporation | Mn-Zn system ferrite |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH06290925A (en) | High frequency low loss ferrite for power supply | |
| JPH09165220A (en) | Manganese-zinc ferrite having high magnetic permeability | |
| JP3550251B2 (en) | Ferrite sintered body for high frequency region and signal chip inductor using the same | |
| JP2907253B2 (en) | High permeability Mn-Zn ferrite | |
| JPH0433755B2 (en) | ||
| JPH11302069A (en) | High permeability mn-zn-based ferrite and ferrite core for pulse transformer | |
| JP2802839B2 (en) | Oxide soft magnetic material | |
| JPH1072217A (en) | High permeability mn-zn ferrite and pulse transformer | |
| JP2726388B2 (en) | High magnetic permeability high saturation magnetic flux density Ni-based ferrite core and method of manufacturing the same | |
| JPH10256025A (en) | Manganese-zinc ferrite | |
| JP4436493B2 (en) | High frequency low loss ferrite material and ferrite core using the same | |
| JP2939035B2 (en) | Soft magnetic oxide substance | |
| JP3245206B2 (en) | Manganese-zinc ferrite | |
| JP2731358B2 (en) | Method for producing Mn-Zn ferrite | |
| JP2510788B2 (en) | Low power loss oxide magnetic material | |
| JP3238735B2 (en) | Manganese-zinc ferrite | |
| JP2002353024A (en) | Ferrite magnetic core having low-temperature coefficient, and electronic component | |
| JPH11199235A (en) | Ferrite material | |
| JP3044666B2 (en) | Low loss ferrite for power supply | |
| JP3678479B2 (en) | Low temperature coefficient ferrite core and electronic components | |
| JPH097814A (en) | Oxide magnetic material and its manufacturing method | |
| JP2731357B2 (en) | Method for producing Mn-Zn ferrite | |
| JP2627676B2 (en) | Manufacturing method of oxide magnetic material | |
| JP2718276B2 (en) | Oxide magnetic material | |
| JP2000299217A (en) | High permeability oxide magnetic material |