JP2019131438A - 誘電体磁器組成物および積層セラミックコンデンサ - Google Patents
誘電体磁器組成物および積層セラミックコンデンサ Download PDFInfo
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Abstract
Description
組成式(Ba1−x−ySrxCay)m(Ti1−ZZrZ)O3で表されるペロブスカイト型化合物(ただし、前記m、x、y、zは全てモル比を示し、0.9≦m≦1.1、0≦x≦0.5、0≦y≦0.3、0≦(x+y)≦0.6、0.03≦z≦0.3をそれぞれ満たす)からなる主成分と、
希土類元素Rの酸化物(ただし、Rは、Sc、Y、La、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、YbおよびLuから選択される少なくとも1種)からなる第1副成分とを含み、
前記誘電体磁器組成物は誘電体粒子と粒界とを含み、前記誘電体粒子はZrが誘電体粒子全体に固溶している全固溶粒子を含み、
前記誘電体磁器組成物におけるTi原子の濃度を100原子%とした場合の、誘電体磁器組成物におけるZr濃度をZaとし、
前記全固溶粒子におけるTi原子の濃度を100原子%とした場合の、全固溶粒子におけるZrの平均濃度をZbとした際に、
0.7<(Zb/Za)を満足し、
前記Zbを測定した際の測定値の標準偏差と平均値とが、
(標準偏差/平均値)≦0.15
を満足することを特徴としている。
(標準偏差/平均値)<0.10を満足することが好ましい。
0.8<(Zb/Za)を満足することが好ましい。
図1に示すように、セラミック電子部品の非制限的一例としての積層セラミックコンデンサ1は、誘電体層2と、内部電極層3と、が交互に積層された構成のコンデンサ素子本体10を有する。内部電極層3は、各端面がコンデンサ素子本体10の対向する2端部の表面に交互に露出するように積層してある。一対の外部電極4は、コンデンサ素子本体10の両端部に形成され、交互に配置された内部電極層3の露出端面に接続されて、コンデンサ回路を構成する。
誘電体層2の厚みは、特に制限されないが、一層あたり0.5〜20μm程度であることが好ましい。
本実施形態に係る誘電体磁器組成物の主成分は、組成式(Ba1−x−ySrxCay)m(Ti1−ZZrZ)O3で表されるペロブスカイト型化合物である。ここで、m、x、y、zは全てモル比を示す。
本実施形態では、上記の誘電体層2を構成する誘電体磁器組成物は、誘電体粒子と粒界とを含み、偏析相を含んでいても良い。前記誘電体粒子はZrが誘電体粒子全体に固溶している全固溶粒子を含む。誘電体粒子の粒子形状、粒径は特に限定はされない。
また、偏析相23とは、組成が前記範囲を外れ、たとえば過剰のTiあるいは過剰のZr、あるいは過剰のアルカリ土類金属を含む相である。
内部電極層3に含有される導電材は特に限定されないが、誘電体層2を構成する材料が耐還元性を有するため、比較的安価な卑金属を用いることができる。導電材として用いる卑金属としては、NiまたはNi合金が好ましい。Ni合金としては、Mn,Cr,CoおよびAlから選択される1種以上の元素とNiとの合金が好ましく、合金中のNi含有量は95質量%以上であることが好ましい。なお、NiまたはNi合金中には、P等の各種微量成分が0.1質量%程度以下含まれていてもよい。内部電極層3の厚さは用途等に応じて適宜決定すればよいが、通常、0.1〜3μm程度であることが好ましい。
外部電極4に含有される導電材は特に限定されないが、本発明では安価なNi,Cuや、これらの合金を用いることができる。外部電極4の厚さは用途等に応じて適宜決定すればよいが、通常、10〜50μm程度であることが好ましい。
本実施形態の積層セラミックコンデンサ1は、従来の積層セラミックコンデンサと同様に、ペーストを用いた通常の印刷法やシート法によりグリーンチップを作製し、これを焼成した後、外部電極を印刷または転写して焼成することにより製造される。以下、製造方法について非制限的具体例を説明する。
誘電体原料として、主成分の原料と、各副成分の原料とを準備する。これらの原料としては、上記した成分の酸化物やその混合物、複合酸化物を用いることができる。また、焼成により上記した酸化物や複合酸化物となる各種化合物、たとえば、炭酸塩、シュウ酸塩、硝酸塩、水酸化物、有機金属化合物等から適宜選択し、混合して用いることもできる。
本実施形態に係る誘電体磁器組成物を得るためには、上記各原料を一括混合し、これを仮焼きすることが好ましい。
誘電体原料を調製するために、各成分原料を十分に混合し、混合粉末を得て、これを熱処理(仮焼き)して、仮焼原料を得る。原料の混合は特に限定はされないが、湿式法により20時間程度十分に混合し、その後乾燥する。
次に、誘電体原料を塗料化して、誘電体層用ペーストを調製する。誘電体層用ペーストは、誘電体原料と有機ビヒクルとを混練した有機系の塗料であってもよく、水系の塗料であってもよい。
焼成前に、グリーンチップに脱バインダ処理を施す。脱バインダ条件としては、昇温速度を好ましくは5〜300℃/時間、保持温度を好ましくは180〜900℃、温度保持時間を好ましくは0.5〜24時間とする。また、脱バインダ雰囲気は、空気もしくは還元性雰囲気とする。
このようにして製造された本実施形態の積層セラミックコンデンサは、ハンダ付等によりプリント基板上などに実装され、各種電子機器等に使用される。
(原料)
主成分原料として、炭酸バリウム(BaCO3)、炭酸カルシウム(CaCO3)、炭酸ストロンチウム(SrCO3)、酸化チタン(TiO2)および酸化ジルコニウム(ZrO2)を、それぞれ準備した。さらに、第1副成分原料として希土類酸化物を、第2副成分原料として酸化マグネシウム(MgO)を、第3副成分の原料としてMnおよびCrの酸化物を、焼結助剤の原料としてSiおよびAlの酸化物をそれぞれ準備した。
脱水乾燥後に、室温から1000℃まで昇温速度200℃/時間で昇温し、さらに1000℃から1100℃までを表2に記載の昇温速度で昇温し、1100℃で4時間仮焼成し、必要に応じ粉砕し、仮焼原料(誘電体原料)の粉末を得た。
次いで、得られた誘電体原料:100質量部と、ポリビニルブチラール樹脂:10質量部と、可塑剤としてのジオクチルフタレート(DOP):5質量部と、溶媒としてのアルコール:100質量部とをボールミルで混合してペースト化し、誘電体層用ペーストを得た。
また、上記とは別に、Ni粒子:44.6質量部と、テルピネオール:52質量部と、エチルセルロース:3質量部と、ベンゾトリアゾール:0.4質量部とを、3本ロールにより混練し、ペースト化して内部電極層用ペーストを作製した。
そして、上記にて作製した誘電体層用ペーストを用いて、PETフィルム上に、乾燥後の厚みが15μmとなるようにグリーンシートを形成した。次いで、この上に内部電極層用ペーストを用いて、電極層を所定パターンで印刷した後、PETフィルムからシートを剥離し、電極層を有するグリーンシートを作製した。次いで、電極層を有するグリーンシートを複数枚積層し、加圧接着することによりグリーン積層体とし、このグリーン積層体を所定サイズに切断することにより、グリーンチップを得た。
次いで、得られたグリーンチップについて、脱バインダ処理、焼成およびアニールを下記条件にて行って、素子本体となる焼結体を得た。
蛍光X線分析法により、誘電体磁器組成物におけるTiおよびZrの含有量を測定し、Ti原子の濃度を100原子%とした際の、Zrの濃度(原子%)をZaとする。
走査型透過電子顕微鏡(STEM)に付属のエネルギー分散型X線分光装置(EDS)を用いて、TiとZrについて点分析を行う。この点分析は、各測定粒子において100nm毎の間隔で10点以上を任意に選択して行われ、また10個以上の誘電体粒子について行うことが好ましい。Ti原子の濃度を100原子%とした際の、各分析点のZr濃度(原子%)の測定値を平均してZbとする。
コンデンサ試料に対し、絶縁抵抗計(アドバンテスト社製R8340A)を用いて、20℃において500Vの直流電圧を、コンデンサ試料に10秒間印加し、印加後50秒放置した後の絶縁抵抗IRを測定した。本実施例では、3.0×1012Ω以上を良好(A)とし、3.5×1012Ω以上を優良(S)とし、3.0×1012Ω未満を不良(F)とた。
コンデンサ試料に対し、200℃にて60V/μmの電界下で直流電圧の印加状態を保持し、コンデンサ試料の絶縁劣化時間を測定することにより、高温負荷寿命を評価した。本実施例においては、電圧印加開始から絶縁抵抗が1桁落ちるまでの時間を寿命とし定義した。また、本実施例では、上記の評価を10個のコンデンサ試料について行い、これをワイブル解析することにより算出した平均故障時間(Mean Time To Failure)をその試料の高温負荷寿命と定義した。本実施例では100時間以上を良好(A)とし、130時間以上を優良(S)とし、100時間未満を不良(F)とした。
図5に試料9〜12のZb/Zaと高温負荷寿命(MTTF)との関係を示す。図5よりZb/Zaが0.7を超えると、高温負荷寿命が顕著に向上することが分かる。図6に試料13〜18における全固体粒子のZb測定時のばらつき(標準偏差/平均値)とIRとの関係を示す。図6より全固体粒子におけるZr濃度のばらつきが0.15以下であるとIRが顕著に向上することが分かる。
2… 誘電体層
21… コアシェル構造粒子
22… 全固溶粒子
3… 内部電極層
4… 外部電極
10… コンデンサ素子本体
Claims (5)
- 組成式(Ba1−x−ySrxCay)m(Ti1−ZZrZ)O3で表されるペロブスカイト型化合物(ただし、前記m、x、y、zは全てモル比を示し、0.9≦m≦1.1、0≦x≦0.5、0≦y≦0.3、0≦(x+y)≦0.6、0.03≦z≦0.3をそれぞれ満たす)からなる主成分と、
希土類元素Rの酸化物(ただし、Rは、Sc、Y、La、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、YbおよびLuから選択される少なくとも1種)からなる第1副成分とを含む誘電体磁器組成物であって、
前記誘電体磁器組成物は誘電体粒子と粒界とを含み、前記誘電体粒子はZrが誘電体粒子全体に固溶している全固溶粒子を含み、
前記誘電体磁器組成物におけるTi原子の濃度を100原子%とした場合の、誘電体磁器組成物におけるZr濃度をZaとし、
前記全固溶粒子におけるTi原子の濃度を100原子%とした場合の、全固溶粒子におけるZrの平均濃度をZbとした際に、
0.7<(Zb/Za)を満足し、
前記Zbを測定した際の測定値の標準偏差と平均値とが、
(標準偏差/平均値)≦0.15
を満足する誘電体磁器組成物。 - 前記(標準偏差/平均値)が、
(標準偏差/平均値)<0.10
を満足する請求項1に記載の誘電体磁器組成物。 - 前記ZaとZbとが、
0.8<(Zb/Za)
を満足する請求項1または2に記載の誘電体磁器組成物。 - 請求項1〜3の何れかに記載の誘電体磁器組成物を含む電子部品。
- 請求項1〜3の何れかに記載の誘電体磁器組成物を含む誘電体層と、内部電極層とを有する積層セラミックコンデンサ。
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20230000965A (ko) | 2021-06-25 | 2023-01-03 | 다이요 유덴 가부시키가이샤 | 유전체, 적층 세라믹 콘덴서, 유전체의 제조 방법, 및 적층 세라믹 콘덴서의 제조 방법 |
US20230041011A1 (en) * | 2021-07-26 | 2023-02-09 | Samsung Electro-Mechanics Co., Ltd. | Dielectric ceramic composition and capacitor component |
KR20230120997A (ko) | 2022-02-10 | 2023-08-17 | 다이요 유덴 가부시키가이샤 | 유전체 조성물, 적층 세라믹 전자 부품, 유전체 조성물의 제조 방법, 및 적층 세라믹 전자 부품의 제조 방법 |
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JP7406952B2 (ja) | 2019-10-17 | 2023-12-28 | 太陽誘電株式会社 | 圧電セラミックス及びその製造方法、並びに圧電素子 |
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JP6841036B2 (ja) * | 2016-12-28 | 2021-03-10 | Tdk株式会社 | 積層セラミック電子部品 |
JP6939611B2 (ja) * | 2018-01-31 | 2021-09-22 | Tdk株式会社 | 誘電体磁器組成物および積層セラミックコンデンサ |
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JP7276659B2 (ja) * | 2019-08-27 | 2023-05-18 | Tdk株式会社 | 誘電体組成物および電子部品 |
CN113200744B (zh) * | 2021-04-25 | 2021-11-30 | 湖南省美程陶瓷科技有限公司 | 一种无铅压电陶瓷传感器材料及其制备方法 |
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