JPH11228217A - Mn-zn ferrite - Google Patents

Mn-zn ferrite

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Publication number
JPH11228217A
JPH11228217A JP10030769A JP3076998A JPH11228217A JP H11228217 A JPH11228217 A JP H11228217A JP 10030769 A JP10030769 A JP 10030769A JP 3076998 A JP3076998 A JP 3076998A JP H11228217 A JPH11228217 A JP H11228217A
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JP
Japan
Prior art keywords
khz
terms
ferrite
magnetic permeability
mol
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
Application number
JP10030769A
Other languages
Japanese (ja)
Inventor
Yutaka Higuchi
豊 樋口
Kensuke Yasuda
賢助 安田
Hitoshi Ueda
等 上田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP10030769A priority Critical patent/JPH11228217A/en
Publication of JPH11228217A publication Critical patent/JPH11228217A/en
Pending legal-status Critical Current

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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

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)
  • Compounds Of Iron (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an Mn-Zn ferrite having high magnetic permeability with improved initial permeability especially in a high-frequency region of 100-500 kHz. SOLUTION: This ferrite contains 50.0-55.0 mol.% of Fe2 O3 , 15.0-25.0 mol.% of ZnO and the remaining part of manganese oxide as main components and further contains 0.005-0.06 wt.% of Bi2 O3 , 0.005-0.04 wt.% of Nb2 O5 , 0.01-0.20 wt.% of ZrO2 , 0.003-0.04 wt.% of CaO and 0.002-0.015 wt.% of SiO2 as subsidiary components.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、高透磁率を有する
Ｍｎ−Ｚｎ系フェライトに関するものである。The present invention relates to a Mn-Zn ferrite having a high magnetic permeability.

【０００２】[0002]

【従来の技術】 従来の高透磁率を有するＭｎ−Ｚｎ系
フェライトは、Ｆｅ2Ｏ3、ＺｎＯ、酸化マンガンを主成
分として構成され、この主成分に対し、種々の添加物を
加えた材料からなっている。このような高透磁率Ｍｎ−
Ｚｎ系フェライトは、各種通信機器のトランスやライン
フィルター等の磁心として用いられている。2. Description of the Related Art A conventional Mn-Zn ferrite having a high magnetic permeability is mainly composed of Fe 2 O 3 , ZnO and manganese oxide, and is made of a material obtained by adding various additives to this main component. Has become. Such high permeability Mn-
Zn-based ferrites are used as magnetic cores for transformers and line filters of various communication devices.

【０００３】[0003]

【発明が解決しようとする課題】最近では、１００〜５
００ｋＨｚの高周波帯域においての用途が増えている。
このため、１００〜５００ｋＨｚの高周波帯域において
高透磁率を有するＭｎ−Ｚｎ系フェライトの要求が拡大
している。従来のＭｎ−Ｚｎ系フェライトにおいて、高
周波での透磁率特性を改善するために、ＣａＯ、ＳｉＯ
2、Ｂｉ2Ｏ3の複合添加が提案されている。しかし、こ
の提案では１００ｋＨｚ程度までしか高透磁率が得られ
ず、５００ｋＨｚまで高い透磁率が要求される高性能ラ
インフィルター用等の磁心を得ることはできなかった。Recently, 100 to 5
Applications in the high frequency band of 00 kHz are increasing.
For this reason, the demand for Mn—Zn-based ferrite having high magnetic permeability in a high-frequency band of 100 to 500 kHz is expanding. In conventional Mn-Zn based ferrites, in order to improve the magnetic permeability characteristics at high frequencies, CaO, SiO
2 , a composite addition of Bi 2 O 3 has been proposed. However, in this proposal, a high magnetic permeability can be obtained only up to about 100 kHz, and a magnetic core for a high-performance line filter or the like which requires a high magnetic permeability up to 500 kHz cannot be obtained.

【０００４】本発明は、特に１００〜５００ｋＨｚの高
周波帯域における初透磁率を向上した高透磁率を有する
Ｍｎ−Ｚｎ系フェライトを提供することを目的とする。[0004] It is an object of the present invention to provide a Mn-Zn ferrite having a high magnetic permeability with an improved initial magnetic permeability particularly in a high frequency band of 100 to 500 kHz.

【０００５】[0005]

【課題を解決するための手段】本発明は、Ｆｅ、Ｍｎ、
Ｚｎを主成分とし、それぞれＦｅ2Ｏ3換算で５０．０〜
５５．０モル％、ＺｎＯ換算で１５．０〜２５．０モル
％、残部酸化マンガンとなるＭｎ−Ｚｎ系フェライトで
あって、副成分としてＢｉ2Ｏ3換算で０．００５〜０．
０６重量％、Ｎｂ2Ｏ5換算で０．００５〜０．０４重量
％、ＺｒＯ2換算で０．０１〜０．２０重量％、ＣａＯ
換算で０．００３〜０．０４重量％、ＳｉＯ2換算で
０．００２〜０．０１５重量％のＢｉ、Ｎｂ、Ｚｒ、Ｃ
ａ、Ｓｉを含有することを特徴とするＭｎ−Ｚｎ系フェ
ライトである。The present invention provides Fe, Mn,
The Zn as a main component, 50.0～ respectively terms of Fe 2 O 3
55.0 mole%, 15.0 to 25.0 mol% in terms of ZnO, a Mn-Zn ferrite as the balance of manganese oxide, calculated as Bi 2 O 3 as an auxiliary component 0.005 to 0.
06 wt%, 0.005 to 0.04 wt% calculated as Nb 2 O 5, 0.01 to 0.20 wt% in terms of ZrO 2, CaO
0.003 to 0.04% by weight in conversion, 0.002 to 0.015% by weight in conversion of SiO 2 , Bi, Nb, Zr, C
This is a Mn-Zn ferrite containing a and Si.

【０００６】また本発明は、上記発明において、初透磁
率μｉが周波数１００ｋＨｚにおいて８，０００以上、
５００ｋＨｚにおいて３０００以上であることを特徴と
するＭｎ−Ｚｎ系フェライトである。Further, the present invention provides the above-mentioned invention, wherein the initial magnetic permeability μi is 8,000 or more at a frequency of 100 kHz.
It is a Mn-Zn-based ferrite having a frequency of 3000 or more at 500 kHz.

【０００７】また本発明は、Ｆｅ、Ｍｎ、Ｚｎを主成分
とし、それぞれＦｅ2Ｏ3換算で５０．０〜５５．０モル
％、ＺｎＯ換算で１５．０〜２５．０モル％、残部酸化
マンガンとなるＭｎ−Ｚｎ系フェライトであって、副成
分としてＢｉ2Ｏ3換算で０．０２〜０．０６重量％、Ｎ
ｂ2Ｏ5換算で０．００５〜０．０２重量％、ＺｒＯ2換
算で０．０１〜０．０５重量％、ＣａＯ換算で０．００
５〜０．０２重量％、ＳｉＯ2換算で０．００２〜０．
０１重量％のＢｉ、Ｎｂ、Ｚｒ、Ｃａ、Ｓｉを含有する
ことを特徴とするＭｎ−Ｚｎ系フェライトである。Further, the present invention comprises Fe, Mn, and Zn as main components, each containing 50.0 to 55.0 mol% in terms of Fe 2 O 3 , 15.0 to 25.0 mol% in terms of ZnO, and the balance being oxidized. a Mn-Zn ferrite comprising manganese, 0.02 to 0.06 wt% in terms of Bi 2 O 3 as a subcomponent, N
b 2 O 5 converted at 0.005-0.02% by weight, 0.01 to 0.05 wt% in terms of ZrO 2, 0.00 in terms of CaO
5 to 0.02% by weight, 0.002 to 0 in terms of SiO 2.
A Mn-Zn ferrite containing 01% by weight of Bi, Nb, Zr, Ca, and Si.

【０００８】また本発明は、上記発明において、初透磁
率μｉが周波数１００ｋＨｚにおいて９，０００以上、
５００ｋＨｚにおいて３０００以上であることを特徴と
するＭｎ−Ｚｎ系フェライトである。Further, according to the present invention, in the above invention, the initial magnetic permeability μi is 9,000 or more at a frequency of 100 kHz,
It is a Mn-Zn-based ferrite having a frequency of 3000 or more at 500 kHz.

【０００９】[0009]

【発明の実施の形態】従来、初透磁率の周波数特性を改
善する手段として、ＣａＯ−ＳｉＯ2添加により結晶粒
界に高抵抗層を形成させ、損失を低減することが行われ
ていた。このとき、１００〜５００ｋＨｚの高周波帯域
で用いられるＭｎ−Ｚｎ系フェライトの初透磁率μｉ
は、５０００〜７０００程度であった。一方、Ｂｉ2Ｏ3
等の低融点化合物の添加により結晶粒を成長させ、Ｃａ
Ｏ−ＳｉＯ2添加をできるだけ少なくし、粒界層を薄く
することにより高透磁率を得る手段がある。しかし、こ
の手段によると、例えば５００ｋＨｚといった高周波帯
域で、逆に初透磁率μｉが低下していた。DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventionally, as a means for improving the frequency characteristic of initial permeability, a high resistance layer is formed at a crystal grain boundary by adding CaO--SiO 2 to reduce loss. At this time, the initial permeability μi of the Mn—Zn-based ferrite used in the high frequency band of 100 to 500 kHz.
Was about 5,000 to 7000. On the other hand, Bi 2 O 3
Crystal grains are grown by adding a low melting point compound such as
And minimize O-SiO 2 addition, there is a means for obtaining a high permeability by reducing the grain boundary layer. However, according to this means, in the high frequency band of, for example, 500 kHz, conversely, the initial magnetic permeability μi was reduced.

【００１０】本発明では、５００ｋＨｚまで高透磁率を
得るためには高密度化、高抵抗化が重要と考えてＢｉ2
Ｏ3、Ｎｂ2Ｏ5、ＺｒＯ2を複合添加した。これにより、
特に１００〜５００ｋＨｚの高周波帯域における初透磁
率を向上させることができた。本発明において、高密度
とは、４．９５ｇ／ｃｍ3以上（好ましくは５．００ｇ
／ｃｍ3以上）、高抵抗とは、０．０６Ω・ｍ以上（好
ましくは０．１０Ω・ｍ以上）である。[0010] In the present invention, densification in order to obtain a high magnetic permeability up to 500 kHz, consider high resistance is important Bi 2
O 3 , Nb 2 O 5 , and ZrO 2 were combined and added. This allows
In particular, the initial permeability in the high frequency band of 100 to 500 kHz could be improved. In the present invention, the high density means 4.95 g / cm 3 or more (preferably 5.00 g / cm 3).
/ Cm 3 or more) and high resistance are 0.06 Ω · m or more (preferably 0.10 Ω · m or more).

【００１１】本発明によると、主成分組成は、Ｆｅ2Ｏ3
換算でが５０．０〜５５．０モル％、ＺｎＯ換算で１
５．０〜２５．０モル％を外れる組成領域では、初透磁
率８，０００以上のフェライト磁心を得ることが困難で
あり、これに伴うキュリーポイント、セカンダリーピー
クの設定温度からも組成領域は限定される。酸化マンガ
ンはその残部である。このキュリーポイントは１００℃
以上が好ましく、さらに好ましくは１２０℃以上であ
る。また、セカンダリーピークは１０〜６０℃が好まし
く、さらに好ましくは２０〜５０℃である。According to the present invention, the main component composition is Fe 2 O 3
50.0 to 55.0 mol% in conversion, 1 in ZnO conversion
In a composition region outside of 5.0 to 25.0 mol%, it is difficult to obtain a ferrite core having an initial magnetic permeability of 8,000 or more, and the composition region is limited also by the Curie point and the secondary peak set temperature. Is done. Manganese oxide is the balance. This Curie point is 100 ℃
The temperature is preferably at least 120 ° C. The secondary peak is preferably from 10 to 60 ° C, more preferably from 20 to 50 ° C.

【００１２】さらに副成分として、Ｂｉ、Ｎｂ、Ｚｒ、
Ｃａ、Ｓｉを含有する。Ｂｉは、含有量が少なすぎると
結晶粒成長や高密度化しないため、特に低周波帯域（１
０〜１００ｋＨｚ）で高透磁率が得られず望ましくな
い。一方、含有量が多すぎると異常粒成長が生じて、初
透磁率の低下、特に高周波帯域における初透磁率の低下
を招くため望ましくない。このため、Ｂｉ2Ｏ3換算で
０．００５〜０．０６重量％が適当である。好ましく
は、０．０２〜０．０６重量％である。Further, Bi, Nb, Zr,
Contains Ca and Si. If the content of Bi is too small, the crystal grains do not grow and the density is not increased.
(0 to 100 kHz), a high magnetic permeability cannot be obtained, which is not desirable. On the other hand, if the content is too large, abnormal grain growth occurs, leading to a decrease in initial magnetic permeability, particularly a decrease in initial magnetic permeability in a high frequency band. Therefore, it is appropriate 0.005 to 0.06 wt% in terms of Bi 2 O 3. Preferably, it is 0.02 to 0.06% by weight.

【００１３】また、Ｎｂ、Ｚｒについては、含有量が少
なすぎると粒界抵抗が低くなるため、高周波帯域（特に
１００〜５００ｋＨｚ）において高透磁率が得られず望
ましくない。一方、含有量が多すぎると初透磁率の低下
を招くため望ましくない。このため、Ｎｂ2Ｏ5換算で
０．０５〜０．０４重量％が適当であり、好ましくは
０．００５〜０．０２重量％である。また、ＺｒＯ2換
算で０．０１〜０．１０重量％が適当であり、好ましく
は０．０１〜０．０５重量％であり、さらに好ましくは
０．０１〜０．０３重量％である。On the other hand, if the contents of Nb and Zr are too small, the grain boundary resistance becomes low, so that high magnetic permeability cannot be obtained in a high frequency band (especially 100 to 500 kHz), which is not desirable. On the other hand, if the content is too large, the initial magnetic permeability is lowered, which is not desirable. Therefore, it is suitably 0.05 to 0.04 wt% calculated as Nb 2 O 5, preferably from 0.005 to 0.02 wt%. Furthermore, a 0.01 to 0.10 wt% in terms of ZrO 2 is suitable, preferably from 0.01 to 0.05 wt%, more preferably from 0.01 to 0.03 wt%.

【００１４】また、Ｃａ、Ｓｉについては、含有量が多
すぎると初透磁率の低下、特にＳｉ過剰では異常粒成長
が生じて、高周波帯域における初透磁率の低下を招くた
め望ましくない。このため、ＣａＯ換算で０．００３〜
０．０４重量％が適当であり、好ましくは０．００５〜
０．０２重量％である。また、ＳｉＯ2換算で０．００
２〜０．０１５重量％が適当であり、好ましくは０．０
０２〜０．０１重量％である。On the other hand, if the contents of Ca and Si are too large, the initial magnetic permeability is lowered. In particular, if the content of Si is excessive, abnormal grain growth occurs, leading to a decrease in the initial magnetic permeability in a high frequency band. For this reason, 0.003 to CaO conversion
0.04% by weight is suitable, preferably 0.005 to
0.02% by weight. In addition, 0.002 in terms of SiO 2
2 to 0.015% by weight is suitable, and preferably 0.02% by weight.
02 to 0.01% by weight.

【００１５】[0015]

【実施例】主成分組成がＦｅ2Ｏ3 ５２．５モル％、Ｍ
ｎＯ ２４．５モル％、ＺｎＯ２３．０モル％となるよ
う計量混合して、これを９００℃で２時間仮焼した。こ
れにＣａＯ ０．０１重量％（ＣａＣＯ3を使用）、Ｓ
ｉＯ2 ０．０１重量％、さらに表１に示す副成分を含
有させ、湿式ボールミルで８時間粉砕した。これらにバ
インダー添加、スプレードライヤー造粒後、リング状に
圧縮成形して、１３２０℃で５時間、酸素濃度を制御し
た窒素雰囲気中で焼成した。EXAMPLE The main component composition was 52.5 mol% of Fe 2 O 3 , M
The mixture was weighed and mixed so that nO was 24.5 mol% and ZnO was 23.0 mol%, and was calcined at 900 ° C. for 2 hours. To this, CaO 0.01% by weight (using CaCO 3 ), S
0.01% by weight of iO 2 and the subcomponents shown in Table 1 were further added, and pulverized by a wet ball mill for 8 hours. After adding a binder thereto and granulating with a spray drier, the mixture was compression-molded into a ring shape and baked at 1320 ° C. for 5 hours in a nitrogen atmosphere having a controlled oxygen concentration.

【００１６】上記により得られた外径２５ｍｍ、内径１
５ｍｍ、高さ５ｍｍのそれぞれの焼結体について、２３
℃における初透磁率μｉを測定した。このときの周波数
１００、５００ｋＨｚの初透磁率μｉ、焼成密度、抵抗
値を表１に示す。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。The outer diameter of 25 mm and the inner diameter of 1 obtained above
For each sintered body of 5 mm and height of 5 mm, 23
The initial magnetic permeability μi at ℃ was measured. Table 1 shows the initial magnetic permeability μi, the firing density, and the resistance at the frequencies of 100 and 500 kHz. In Table 1, those within the scope of the present invention are examples, and those outside the scope are comparative examples.

【００１７】[0017]

【表１】 [Table 1]

【００１８】この表１に示すとおり、Ｂｉ2Ｏ3、Ｎｂ2
Ｏ5、ＺｒＯ2の含有量は、本発明の範囲で変わっても広
い周波数帯域、特に１００〜５００ｋＨｚの高周波帯域
において高い初透磁率を得ることができる。つまり、１
００ｋＨｚで８１００以上、５００ｋＨｚで３２００以
上の高透磁率を得ている。また、焼成密度は５．００ｇ
／ｃｍ3以上が得られ、抵抗値は０．０７Ω・ｍ以上が
得られている。また、この実施例のキュリーポイントは
１３０℃で、セカンダリーピークは４０℃であった。こ
こで、比較例１では異常粒成長により初透磁率μｉの低
下がみられた。As shown in Table 1, Bi 2 O 3 , Nb 2
O 5, ZrO 2 content is wide frequency band be varied in the scope of the present invention, it is possible to obtain particularly high initial permeability in a high frequency band of 100-500 kHz. That is, 1
High magnetic permeability of 8100 or more at 00 kHz and 3200 or more at 500 kHz. The firing density is 5.00 g.
/ Cm 3 or more and a resistance value of 0.07 Ω · m or more. The Curie point of this example was 130 ° C., and the secondary peak was 40 ° C. Here, in Comparative Example 1, the initial magnetic permeability μi was reduced due to abnormal grain growth.

【００１９】次に、主成分組成がＦｅ2Ｏ3 ５２．５モ
ル％、ＭｎＯ ２４．５モル％、ＺｎＯ ２３．０モル
％となるよう計量混合して、これを９００℃で２時間仮
焼した。これにＢｉ2Ｏ3 ０．０６重量％、Ｎｂ2Ｏ5
０．０１重量％、ＺｒＯ2０．０２重量％、さらに表２
に示す副成分を含有させ、湿式ボールミルで８時間粉砕
した。これらにバインダー添加、スプレードライヤー造
粒後、リング状に圧縮成形して、１３２０℃で５時間、
酸素濃度を制御した窒素雰囲気中で焼成した。Next, the main components were mixed and weighed so that the composition was 52.5 mol% of Fe 2 O 3 , 24.5 mol% of MnO, and 23.0 mol% of ZnO, and this was calcined at 900 ° C. for 2 hours. did. 0.06% by weight of Bi 2 O 3 and Nb 2 O 5
0.01% by weight, ZrO 2 0.02% by weight, and Table 2
And pulverized by a wet ball mill for 8 hours. After adding a binder to these and granulating with a spray drier, compression molding into a ring shape was performed at 1320 ° C. for 5 hours.
The firing was performed in a nitrogen atmosphere with a controlled oxygen concentration.

【００２０】上記により得られた外径２５ｍｍ、内径１
５ｍｍ、高さ５ｍｍのそれぞれの焼結体について、２３
℃における初透磁率μｉを測定した。このときの周波数
１００、５００ｋＨｚの初透磁率μｉ、焼成密度、抵抗
値を表２に示す。この表２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。An outer diameter of 25 mm and an inner diameter of 1
For each sintered body of 5 mm and height of 5 mm, 23
The initial magnetic permeability μi at ℃ was measured. Table 2 shows the initial magnetic permeability μi, firing density, and resistance at the frequencies of 100 and 500 kHz. In Table 2, those within the scope of the present invention are examples, and those outside the range are comparative examples.

【００２１】[0021]

【表２】 [Table 2]

【００２０】この表２に示すとおり、ＣａＯ、ＳｉＯ2
の含有量は、本発明の範囲で変わっても、１００ｋＨｚ
で８３００以上、５００ｋＨｚで３０００以上の高透磁
率を得ることができた。また、焼成密度は５．０１ｇ／
ｃｍ3以上、抵抗値は０．０６Ω・ｍ以上が得られてい
る。また、この実施例のキュリーポイントは１３０℃
で、セカンダリーピークは４０℃であった。As shown in Table 2, CaO, SiO 2
Is 100 kHz even if it varies within the scope of the present invention.
And high magnetic permeability of 500 or more and 3000 or more at 500 kHz. The firing density was 5.01 g /
cm 3 or more and a resistance value of 0.06 Ω · m or more. The Curie point of this example is 130 ° C.
The secondary peak was at 40 ° C.

【００２１】[0021]

【発明の効果】本発明によれば、Ｍｎ−Ｚｎ系フェライ
トにおいて、特に１００〜５００ｋＨｚの高周波帯域に
おいて高透磁率が得られ、初透磁率μｉが周波数１００
ｋＨｚにおいて８，０００以上、５００ｋＨｚにおいて
３０００以上の高透磁率Ｍｎ−Ｚｎ系フェライトを得る
ことができる。さらには初透磁率μｉが周波数１００ｋ
Ｈｚにおいて９，０００以上、５００ｋＨｚにおいて３
０００以上の高透磁率Ｍｎ−Ｚｎ系フェライトを得るこ
とができる。本発明のＭｎ−Ｚｎ系フェライトの磁心を
用いることにより、高周波で用いられるラインフィルタ
ーの小型化・高性能化が可能となる。According to the present invention, high permeability can be obtained in the high frequency band of 100 to 500 kHz especially in the Mn-Zn based ferrite, and the initial permeability μi is 100 MHz.
High permeability Mn-Zn based ferrite of 8,000 or more at kHz and 3000 or more at 500 kHz can be obtained. Furthermore, the initial permeability μi is 100 k
9,000 or more in Hz and 3 in 500 kHz
A high permeability Mn-Zn ferrite of 000 or more can be obtained. By using the magnetic core of the Mn-Zn-based ferrite of the present invention, the size and performance of a line filter used at a high frequency can be reduced.

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 Ｆｅ、Ｍｎ、Ｚｎを主成分とし、それぞ
れＦｅ2Ｏ3換算で５０．０〜５５．０モル％、ＺｎＯ換
算で１５．０〜２５．０モル％、残部酸化マンガンとな
るＭｎ−Ｚｎ系フェライトであって、副成分としてＢｉ
2Ｏ3換算で０．００５〜０．０６重量％、Ｎｂ2Ｏ5換算
で０．００５〜０．０４重量％、ＺｒＯ2換算で０．０
１〜０．２０重量％、ＣａＯ換算で０．００３〜０．０
４重量％、ＳｉＯ2換算で０．００２〜０．０１５重量
％のＢｉ、Ｎｂ、Ｚｒ、Ｃａ、Ｓｉを含有することを特
徴とするＭｎ−Ｚｎ系フェライト。1. Main components are Fe, Mn, and Zn, each being 50.0 to 55.0 mol% in terms of Fe 2 O 3 , 15.0 to 25.0 mol% in terms of ZnO, and the balance being manganese oxide. Mn-Zn based ferrite, and Bi as a subcomponent
0.005 to 0.06 wt% in 2 O 3 basis, 0.005 to 0.04 wt% calculated as Nb 2 O 5, in terms of ZrO 2 0.0
1 to 0.20% by weight, 0.003 to 0.0 in terms of CaO
4 wt%, Mn-Zn ferrite, characterized in that it contains 0.002 to 0.015 wt% of Bi in terms of SiO 2, Nb, Zr, Ca, and Si. 【請求項２】 初透磁率μｉが周波数１００ｋＨｚにお
いて８，０００以上、５００ｋＨｚにおいて３０００以
上であることを特徴とする請求項１に記載のＭｎ−Ｚｎ
系フェライト。2. The Mn—Zn according to claim 1, wherein the initial magnetic permeability μi is 8,000 or more at a frequency of 100 kHz and 3000 or more at a frequency of 500 kHz.
System ferrite. 【請求項３】 Ｆｅ、Ｍｎ、Ｚｎを主成分とし、それぞ
れＦｅ2Ｏ3換算で５０．０〜５５．０モル％、ＺｎＯ換
算で１５．０〜２５．０モル％、残部酸化マンガンとな
るＭｎ−Ｚｎ系フェライトであって、副成分としてＢｉ
2Ｏ3換算で０．０２〜０．０６重量％、Ｎｂ2Ｏ5換算で
０．００５〜０．０２重量％、ＺｒＯ2換算で０．０１
〜０．０５重量％、ＣａＯ換算で０．００５〜０．０２
重量％、ＳｉＯ2換算で０．００２〜０．０１重量％の
Ｂｉ、Ｎｂ、Ｚｒ、Ｃａ、Ｓｉを含有することを特徴と
するＭｎ−Ｚｎ系フェライト 3. Mainly containing Fe, Mn and Zn, 50.0 to 55.0 mol% in terms of Fe 2 O 3 , 15.0 to 25.0 mol% in terms of ZnO, and the balance being manganese oxide. Mn-Zn based ferrite, and Bi as a subcomponent
2 O 3 0.02 to 0.06 wt% in terms of 0.005-0.02 wt% calculated as Nb 2 O 5, 0.01 in terms of ZrO 2
-0.05% by weight, 0.005 to 0.02 in terms of CaO
Wt%, Mn-Zn ferrite, wherein 0.002 to 0.01 wt% of Bi in terms of SiO 2, Nb, Zr, Ca, in that it contains Si 【請求項４】 初透磁率μｉが周波数１００ｋＨｚにお
いて９，０００以上、５００ｋＨｚにおいて３０００以
上であることを特徴とする請求項３に記載のＭｎ−Ｚｎ
系フェライト。4. The Mn—Zn according to claim 3, wherein the initial magnetic permeability μi is 9,000 or more at a frequency of 100 kHz and 3000 or more at a frequency of 500 kHz.
System ferrite.
JP10030769A 1998-02-13 1998-02-13 Mn-zn ferrite Pending JPH11228217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10030769A JPH11228217A (en) 1998-02-13 1998-02-13 Mn-zn ferrite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10030769A JPH11228217A (en) 1998-02-13 1998-02-13 Mn-zn ferrite

Publications (1)

Publication Number Publication Date
JPH11228217A true JPH11228217A (en) 1999-08-24

Family

ID=12312899

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JPH11228217A (en)

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