JP7396157B2 - 誘電体磁器組成物および電子部品 - Google Patents
誘電体磁器組成物および電子部品 Download PDFInfo
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- JP7396157B2 JP7396157B2 JP2020056534A JP2020056534A JP7396157B2 JP 7396157 B2 JP7396157 B2 JP 7396157B2 JP 2020056534 A JP2020056534 A JP 2020056534A JP 2020056534 A JP2020056534 A JP 2020056534A JP 7396157 B2 JP7396157 B2 JP 7396157B2
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Description
前記R元素はEu,Gd,Tb,Dy,Y,HoおよびYbからなる群から選ばれる1以上の元素であり、
前記M元素はMg,Ca,Mn,VおよびCrからなる群から選ばれる1以上の元素であり、
R2O3換算での前記R元素の酸化物の含有量とSiO2換算での前記Siを含む酸化物の含有量との比が0.8:1~2.2:1の間に含まれ、
MO換算での前記M元素の酸化物の含有量とSiO2換算での前記Siを含む酸化物の含有量との比が0.2:1~1.8:1の間に含まれ、
前記誘電体磁器組成物を構成する誘電体粒子の個数の50%以上がコアシェル構造を有するコアシェル誘電体粒子であり、
前記コアシェル誘電体粒子のシェル部ではチタン酸バリウムに前記R元素、前記M元素およびSiから選ばれる少なくとも1つが固溶しており、
前記コアシェル誘電体粒子のコア部は実質的にチタン酸バリウムから成ることを特徴としている。
R2O3換算で前記R元素の酸化物が1.0モル部以上3.2モル部以下含まれ、
MO換算で前記M元素の酸化物が0.2モル部以上1.6モル部以下含まれ、
SiO2換算で前記Siを含む酸化物が0.8モル部以上3.2モル部以下含まれることが好ましい。
前記誘電体粒子の少なくとも一部は全固溶誘電体粒子であり、
前記誘電体層と一方の前記内部電極層との境界から、前記誘電体層と他方の前記内部電極層との境界までを結ぶ前記内部電極層に垂直な線分の長さをLAとし、
前記線分上の前記シェル部および前記全固溶誘電体粒子の長さの合計をLBとしたとき、
前記LAに対する前記LBの比(LB/LA)が0.2以上0.9以下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の製造方法は、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、製造方法について具体的に説明する。
脱バインダ条件に特に制限はないが、昇温速度を好ましくは5~300℃/時間、保持温度を好ましくは180~400℃、温度保持時間を好ましくは0.5~48時間とする。また脱バインダの雰囲気は、空気中もしくは還元雰囲気中とすることが好ましい。
脱バインダ後、グリーンチップの焼成を行う。焼成条件に特に制限はないが、昇温速度を好ましくは100~10000℃/時間とする。焼成時の保持温度は、好ましくは1350℃以下、より好ましくは1150~1280℃であり、焼成時の保持時間は、好ましくは0.5~20時間、より好ましくは1.0~15時間である。保持温度を上記の範囲にすることにより、内部電極層3を構成する材料の拡散を防ぐことができ、温度特性がより向上する。
還元性雰囲気中で焼成した後、素子本体10にはアニール処理を施すことが好ましい。アニールは、誘電体層2を再酸化するための処理であり、これにより誘電体層2の絶縁抵抗(IR)を著しく上げることができ、信頼性(IR寿命)もより向上させることができる。
実験1では、実施例1~7および比較例1~4に関する実験を行った。
コンデンサ試料を内部電極層に垂直な面で切断後、表面に対してエッチング処理を行った。次にコンデンサ試料の誘電体層についてTEM-EDSを用いて各元素の特性X線の定量分析を行い、各元素についてのマッピング画像を得た。TEM像とTEM-EDS像とを比較し、BaおよびTiの濃度が周囲に比べ高い粒子を誘電体粒子20であると認定した。
コンデンサ試料に対し、周波数1.0kHz、入力信号レベル(測定電圧)1.0Vr msの条件下で、-55℃~125℃における静電容量を測定し、25℃における静電容量を基準として静電容量の変化率ΔCを算出し、EIA規格の温度特性であるX7S特性を満足するか否かについて評価した。本実施例では高温側(125℃)での容量変化率ΔCが±22%以内であるか否かを評価した。125℃での容量変化率が±22%を満足していれば-55℃での容量変化率もX7S特性を満足できる。結果を表2に示す。
コンデンサ試料に対し、200℃にて40V/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定義した。また、本実施例では、上記の評価を20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(MTTF)をそのコンデンサ試料の平均寿命と定義した。本実施例では、平均寿命5時間以上を良好とし、7時間以上を特に良好とした。結果を表2に示す。
コアシェル誘電体粒子比率が50%以上であり、温度特性がX7S特性を満たし、高温負荷寿命が7時間以上である場合をAとし、コアシェル誘電体粒子比率が50%以上であり、温度特性がX7S特性を満たし、高温負荷寿命が5時間以上7時間未満である場合をBとし、それ以外をCと判定した。結果を表2に示す。
実験2では、比較例5に関する実験を行った。
実験3では、実施例8~10に関する実験を行った。
実験4では、実施例11~24に関する実験を行った。
実験5では、実施例23、25、11、26および27に関して実験を行った。
125℃で20分間加熱したコンデンサ試料に対し、温度を125℃で維持した状態で絶縁抵抗計(アドバンテスト社製R8340A)を用いて、25V/μmの直流電圧を1分間印加した後の絶縁抵抗値を測定した。コンデンサ試料の平均層間厚み及び重なり面積から高温絶縁比抵抗値を算出した。本実施例では、5.0×109Ωm以上を良好とした。結果を表10に示す。
比誘電率εrは、コンデンサ試料に対し、150℃にて1時間熱処理を行い、24時間後の静電容量値を基準温度25℃においてデジタルLCRメータ(YHP社製4274A)にて、周波数1.0kHz、入力信号レベル(測定電圧)1.0Vrmsの条件下で測定した。コンデンサ試料に対し、静電容量および平均層間厚み、重なり面積から比誘電率εrを算出した(単位なし)。比誘電率は高い方が好ましく、本実施例では2000以上を良好として、Aと記載し、2000以下の場合をBと記載している。結果を表10に示す。
実験6では、実施例14、11、12、2、21および3に関して実験を行った。
上記の方法により線分VL1~VL10の各LB/LAを求め、その中での最小値および最大値を表12に示す。なお、図4のgraph αおよびgraph βは実施例11に関する。
実験7では、実施例22、12および23に関して実験を行った。
誘電体粒子の平均粒径の測定方法としては、まず、得られたコンデンサ試料を内部電極層に垂直な面で切断し、その切断面を研磨した。そして、その研磨面にケミカルエッチングを施し、その後、走査型電子顕微鏡(SEM)により観察を行い、約1000個の粒子をカウントし誘電体粒子の形状を球と仮定して算出した。結果を表14に示す。
コンデンサ試料に対し、周波数1.0kHz、入力信号レベル(測定電圧)1.0Vrmsの条件下で、-55℃~125℃における静電容量を測定し、25℃における静電容量を基準として静電容量の変化率ΔCを算出し、EIA規格の温度特性であるX7R特性を満足するか否かについて評価した。本実施例では高温側(125℃)での容量変化率ΔCが±15%以内であるか否かを評価した。125℃での容量変化率が±15%を満足していれば-55℃での容量変化率もX7R特性を満足できる。結果を表14に示す。
10… 素子本体
2… 誘電体層
20… 誘電体粒子
200… コアシェル誘電体粒子
200a… コア部
200b… シェル部
202… 全固溶誘電体粒子
22… 偏析粒子
3… 内部電極層
4… 外部電極
Claims (3)
- 誘電体磁器組成物で構成される誘電体層を有し、前記誘電体層を挟んでいる一対の電極層をさらに有する電子部品であって、
前記誘電体磁器組成物はチタン酸バリウムと、R元素の酸化物と、M元素の酸化物と、Siを含む酸化物と、を有し、
前記R元素はEu,Gd,Tb,Dy,Y,HoおよびYbからなる群から選ばれる1以上の元素であり、
前記M元素はMg,Ca,Mn,VおよびCrからなる群から選ばれる1以上の元素であり、
R2O3換算での前記R元素の酸化物の含有量とSiO2換算での前記Siを含む酸化物の含有量との比が0.8:1~2.2:1の間に含まれ、
MO換算での前記M元素の酸化物の含有量とSiO2換算での前記Siを含む酸化物の含有量との比が0.2:1~1.8:1の間に含まれ、
前記チタン酸バリウム100モル部に対して、
R2O3換算でR元素の酸化物が2.2モル部以上3.2モル部以下含まれ、
MO換算で前記M元素の酸化物が0.2モル部以上1.0モル部以下含まれ、
前記誘電体磁器組成物を構成する誘電体粒子の個数の50%以上がコアシェル構造を有するコアシェル誘電体粒子であり、
前記コアシェル誘電体粒子のシェル部ではチタン酸バリウムに前記R元素、前記M元素およびSiから選ばれる少なくとも1つが固溶しており、
前記コアシェル誘電体粒子のコア部は実質的にチタン酸バリウムから成り、
前記誘電体粒子の少なくとも一部は全固溶誘電体粒子であり、
前記誘電体層と一方の前記内部電極層との境界から、前記誘電体層と他方の前記内部電極層との境界までを結ぶ前記内部電極層に垂直な線分の長さをLAとし、
前記線分上の前記シェル部および前記全固溶誘電体粒子の長さの合計をLBとしたとき、
前記LAに対する前記LBの比(LB/LA)が0.3以上0.9以下である電子部品。 - 前記チタン酸バリウム100モル部に対して、
SiO2換算で前記Siを含む酸化物が0.8モル部以上3.2モル部以下含まれる請求項1に記載の電子部品。 - 前記誘電体粒子の平均粒径が0.15μm以上0.30μm以下である請求項1または2に記載の電子部品。
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