JP5092750B2 - 多結晶セラミック磁性材料、マイクロ波磁性部品、及びこれを用いた非可逆回路素子 - Google Patents
多結晶セラミック磁性材料、マイクロ波磁性部品、及びこれを用いた非可逆回路素子 Download PDFInfo
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Description
(1) 組成
本発明の多結晶セラミック磁性材料は、一般式:(Y3-x-y-zBixCayGdz)(Fe5-α-β-γ-εInαAlβVγZrε)O12(ただし、それぞれ原子比で、0.4<x≦1.5、0.5≦y≦1、0≦z≦0.4、y+z<1.3、0≦α≦0.6、0≦β≦0.45、0.25≦γ≦0.5、0≦ε≦0.25、及び0.15≦α+β≦0.75)により表される基本組成を有し、主にガーネット構造を有する相からなり、850〜1050℃と低い温度で焼成可能である。
上記基本組成を有する多結晶セラミック磁性材料は、850〜1050℃の低温焼成性を有するので、銀及び銅のような高い導電率を有する金属からなる電極と一体的に焼成することができる。また60〜130 mTの飽和磁化4πMs(温度係数αm=−0.38%/℃〜−0.2%/℃)、及び20000 A/m以下の強磁性共鳴半値幅ΔHを有するので、磁性材料の高いQ値と電極の電気抵抗による損失を抑えた極めて低損失のマイクロ波磁性体が得られ、アイソレータ、サーキュレータ等のマイクロ波非可逆回路素子に使用すると、優れたマイクロ波特性及び低損失を実現できる。
酸化イットリウム(Y2O3)、酸化ビスマス(Bi2O3)、炭酸カルシウム(CaCO3)、酸化ガドリニウム(Gd2O3)、酸化鉄(Fe2O3)、酸化インジウム(In2O3)、酸化アルミニウム(Al2O3)、酸化バナジウム(V2O5)及び酸化ジルコニウム(ZrO2)のような出発原料を水等の溶剤と混合し、ボールミル等で20〜50時間湿式混合し、乾燥する。得られた混合粉末を800〜900℃の温度で1.5〜2時間仮焼する。仮焼温度は、後の焼成温度より50℃以上低い温度に設定するのが好ましい。仮焼粉末に水等の溶剤を加え、ボールミル等で20〜30時間湿式粉砕し、乾燥する。得られた磁性セラミック組成物粉末の平均粒径は0.5〜2μmが好ましい。磁性セラミック組成物粉末をバインダー及び水、有機溶剤等の溶剤と混錬し、1〜2 ton/cm2の圧力で成形する。得られた成形体を850〜1050℃の温度で焼成する。
上記磁性セラミック組成物粉末にバインダー及び水、有機溶剤等の溶剤を混錬してなる坏土から、複数のグリーンシートを作製する。各グリーンシートに、必要に応じてビアホールを形成した後導電ペーストを印刷し、重ねて熱圧着し、得られた積層体を850〜1050℃の温度で焼成する。これにより、磁性セラミック組成物の焼成と、導電ペーストの焼成とが同時に起こり、一体的に電極を有する磁性セラミック積層体(マイクロ波磁性部品)が得られる。
図1は、本発明の一実施例による非可逆回路素子に用いるマイクロ波磁性部品(中心導体組立体)の外観を示し、図2はその内部構造を示す。図3は本発明の一実施例による非可逆回路素子の内部構造を示す。この非可逆回路素子は、中心導体組立体4と、中央開口部に中心導体組立体4を組み込むコンデンサ積層体5と、コンデンサ積層体5に搭載されたチップ又は抵抗膜からなる抵抗体90と、中心導体組立体4に直流磁界を印加する永久磁石3と、及び磁性ヨークとして機能する磁性金属製の上下ケース1,2と、コンデンサ積層体5と下ケース2の間に設けられた樹脂基板6とを具備する。樹脂基板6は、実装基板との接続端子と、中心導体組立体4とコンデンサ積層体5を接続する電極とを有する。
出発原料として、それぞれ純度99.0%以上のGd2O3、Y2O3、CaCO3、Bi2O3、Fe2O3、In2O3、V2O5、Al2O3及びZrO2を表1に示す組成比に秤量し、スラリー濃度が40質量%となるようにイオン交換水を加え、ボールミルで40時間湿式混合し、乾燥した。得られた粉末を825℃の温度で2時間仮焼した。得られた仮焼粉末に、スラリー濃度が40質量%となるようにイオン交換水を加え、ボールミルで24時間湿式粉砕し、乾燥した。得られた磁性セラミック組成物粉末の平均粒径は0.7μmであった。この磁性セラミック組成物粉末にバインダー(PVA)の水溶液を添加し、混錬することにより得た造粒粉末を2 ton/cm2の圧力で、直径14 mm及び厚さ7 mmの円板に成形した。この成形体を空気中で表1に示す温度で8時間焼成した。
対向する第一及び第二の主面と両主面を連結する側面とを備えた矩形状のマイクロ波磁性体に中心導体を積層した構造を有する図4及び図5に示す中心導体組立体4を、以下の手順で作製した。まず表1に示す試料No. 20の組成を有するY2O3、Bi2O3、CaCO3、Fe2O3、In2O3、Al2O3、及びV2O5からなる出発原料をボールミルで湿式混合し、得られたスラリーを乾燥した後、850℃の温度で仮焼し、ボールミルで湿式粉砕し、式:(Y1.45Bi0.85Ca0.7)(Fe3.95In0.3Al0.4V0.35)O12(原子比)により表される多結晶セラミック磁性材料粉末を作製した。この磁性材料粉末に有機バインダー(ポリビニルブチラールPVB)、可塑剤(ブチルフタリル・ブチルグリコレートBPBG)、及び有機溶剤(エタノール、ブタノール)をボールミルで混合し、粘度を調整した後、ドクターブレード法により厚さ40μmと80μmの磁性セラミックグリーンシートを作製した。
Claims (5)
- 一般式:(Y3-x-y-zBixCayGdz)(Fe5-α-β-γ-εInαAlβVγZrε)O12(ただし、それぞれ原子比で、0.4<x≦1.5、0.5≦y≦1、0≦z≦0.4、y+z<1.3、0≦α≦0.6、0≦β≦0.45、0.25≦γ≦0.5、0≦ε≦0.25、及び0.15≦α+β≦0.75)により表される基本組成を有し、主にガーネット構造を有する相からなり、850〜1050℃の温度で焼成可能であって、飽和磁化4πMsが60〜130 mTであり、その温度係数αmが−0.38%/℃〜−0.2%/℃であり、強磁性共鳴半値幅ΔHが20000 A/m未満であることを特徴とする多結晶セラミック磁性材料。
- 請求項1に記載の多結晶セラミック磁性材料において、
0.5≦x≦0.9、0<α≦0.4であって、強磁性共鳴半値幅ΔHが13000 A/m未満であることを特徴とする多結晶セラミック磁性材料。 - マイクロ波磁性体と、前記マイクロ波磁性体の内部及び/又は表面に形成された電極パターンとを有するマイクロ波磁性部品であって、請求項1又は2に記載の多結晶セラミック磁性材料からなる成形体の内部及び/又は表面に、Ag、Cu、Ag合金、及びCu合金からなる群から選ばれた少なくとも一種を含む導電ペーストを前記電極パターンを形成するように印刷し、一体的に焼成してなることを特徴とするマイクロ波磁性部品。
- 請求項3に記載のマイクロ波磁性部品を具備する非可逆回路素子であって、前記電極パターンは中心導体を構成し、さらに前記中心導体に接続したコンデンサと、前記マイクロ波磁性部品に直流磁界を与えるフェライト磁石とを具備することを特徴とする非可逆回路素子。
- 請求項4に記載の非可逆回路素子において、前記フェライト磁石の残留磁束密度Brは420 mT以上であり、その温度係数が−0.15%/℃〜−0.25%/℃であることを特徴とする非可逆回路素子。
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JP2011073937A (ja) * | 2009-09-30 | 2011-04-14 | Hitachi Metals Ltd | 多結晶磁性セラミック、マイクロ波磁性体及びこれを用いた非可逆回路素子 |
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