JPWO2012096223A1 - 積層セラミックコンデンサ及び積層セラミックコンデンサの製造方法 - Google Patents
積層セラミックコンデンサ及び積層セラミックコンデンサの製造方法 Download PDFInfo
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Abstract
Description
実験例1では、チタン酸バリウムを主成分として、主成分に対してLa、Mg、及びMnの含有量を変化させた誘電体セラミックを用いて積層セラミックコンデンサを作製して、高温負荷寿命試験を実施した。
主成分の出発原料として、BaCO3及びTiO2の各粉末を用意した。そして、これらをTiに対するBaのモル比が1.01となるように秤量して、水を媒体としてボールミルにより一定時間混合した。その後に1000℃で仮焼して、粉砕して主成分のセラミック粉末を得た。
まず、誘電体層となるべきセラミックグリーンシートを形成した。具体的には、上記の原料粉末に、ポリビニルブチラール系バインダ及びエタノールを加えて、ボールミルにより湿式混合した。そして、このスラリーをドクターブレード法によりシート状に成形して、セラミックグリーンシートを得た。
得られた積層セラミックコンデンサについて、高温負荷寿命試験を実施した。
実験例2では、Laの含有量と、Re(Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Y、Ho、Er、Tm、Yb、Lu)元素のLaに対するモル比を変化させた誘電体セラミックを用いて積層セラミックコンデンサを作製した。
まず、実験例1と同様の方法で主成分のセラミック粉末を得た。
次に、副成分の出発原料として、実験例1で示した粉末の他に、Ce2O3、Pr2O3、Nd2O3、Sm2O3、Eu2O3、Gd2O3、Tb2O3、Dy2O3、Y2O3、Ho2O3、Er2O3、Tm2O3、Yb2O3、Lu2O3の各粉末を用意し、これらの粉末を主成分のセラミック粉末中のTi100モル部に対するLaの含有量がa1モル部、Reの含有量がa2モル部、Mgの含有量が3モル部、Mnの含有量が2モル部、Siの含有量が1.5モル部となるように秤量して、主成分のセラミック粉末に配合して、誘電体セラミックの原料粉末を得た。表2に、各実験条件の試料における、a1、a2の値を示す。
上記誘電体セラミックの原料粉末を用いて、実験例1と同様の方法で積層セラミックコンデンサを作製した。
得られた積層セラミックコンデンサについて、実験例1と同様の方法で高温負荷寿命試験を実施した。表2に、各実験条件の試料における、高温負荷寿命試験のMTTFの結果を示す。
2 誘電体層
3、4 内部電極
5 積層体
6、7 外部電極
Claims (15)
- 積層されている複数の誘電体層と、前記誘電体層間の界面に沿って形成されている複数の内部電極と、を有する積層体と、前記積層体の外表面に形成され、前記内部電極と電気的に接続されている複数の外部電極と、を備える積層セラミックコンデンサにおいて、
前記積層体の組成が、BaおよびTiを含むペロブスカイト型化合物(ただし、Baの一部はCa及びSrの少なくとも一方で置換しても良く、Tiの一部はZrで置換しても良い)を主成分とし、さらに、La、MgおよびMnを含み、
前記積層体を溶剤により溶解したときのTiおよびZrの合計含有量を100モル部としたときの、各元素の含有モル部が、
La:2〜6モル部、
Mg:3〜5モル部、
Mn:1.5〜3モル部
であることを特徴とする積層セラミックコンデンサ。 - 前記積層体を溶剤により溶解したときのTiおよびZrの合計含有量を100モル部としたときの、Laの含有モル部が4〜6モル部であることを特徴とする、請求項1に記載の積層セラミックコンデンサ。
- 前記積層体を溶剤により溶解したときのLaの含有量を100モル部としたときの、Ce、Pr、およびNdの合計含有量が20モル部以下(0モル部を含む)であることを特徴とする、請求項1または2に記載の積層セラミックコンデンサ。
- 前記積層体を溶剤により溶解したときのLaの含有量を100モル部としたときの、Sm、Eu、Gd、Tb、Dy、Y、Ho、およびErの合計含有量が10モル部以下(0モル部を含む)であることを特徴とする、請求項1ないし3のいずれか1項に記載の積層セラミックコンデンサ。
- 前記積層体を溶剤により溶解したときのLaの含有量を100モル部としたときの、Tm、Yb、およびLuの合計含有量が5モル部以下(0モル部を含む)であることを特徴とする、請求項1ないし4のいずれか1項に記載の積層セラミックコンデンサ。
- 積層されている複数の誘電体層と、前記誘電体層間の界面に沿って形成されている複数の内部電極と、を有する積層体と、前記積層体の外表面に形成され、前記内部電極と電気的に接続されている複数の外部電極と、を備える積層セラミックコンデンサにおいて、
前記誘電体層の組成が、BaおよびTiを含むペロブスカイト型化合物(ただし、Baの一部はCa及びSrの少なくとも一方で置換しても良く、Tiの一部はZrで置換しても良い)を主成分とし、さらに、La、MgおよびMnを含み、
TiおよびZrの合計含有量を100モル部としたときの、各元素の含有モル部が、
La:2〜6モル部、
Mg:3〜5モル部、
Mn:1.5〜3モル部
であることを特徴とする積層セラミックコンデンサ。 - 前記誘電体層の組成が、TiおよびZrの合計含有量を100モル部としたときの、Laの含有モル部が4〜6モル部であることを特徴とする、請求項6に記載の積層セラミックコンデンサ。
- 前記誘電体層の組成が、Laの含有量を100モル部としたときの、Ce、Pr、およびNdの合計含有量が20モル部以下(0モル部を含む)であることを特徴とする、請求項6または7に記載の積層セラミックコンデンサ。
- 前記誘電体層の組成が、Laの含有量を100モル部としたときの、Sm、Eu、Gd、Tb、Dy、Y、Ho、およびErの合計含有量が10モル部以下(0モル部を含む)であることを特徴とする、請求項6ないし8のいずれか1項に記載の積層セラミックコンデンサ。
- 前記誘電体層の組成が、Laの含有量を100モル部としたときの、Tm、Yb、およびLuの合計含有量が5モル部以下(0モル部を含む)であることを特徴とする、請求項6ないし9のいずれか1項に記載の積層セラミックコンデンサ。
- BaおよびTiを含むペロブスカイト型化合物(ただし、Baの一部はCa及びSrの少なくとも一方で置換しても良く、Tiの一部はZrで置換しても良い)を主成分とする主成分粉末を用意する工程と、
La化合物、Mg化合物、Mn化合物を用意する工程と、
前記主成分粉末、前記La化合物、Mg化合物、Mn化合物を混合し、その後、セラミックスラリーを得る工程と、
前記セラミックスラリーからセラミックグリーンシートを得る工程と、
前記セラミックグリーンシートと、内部電極層と、を積み重ねて焼成前の積層体を得る工程と、
前記焼成前の積層体を焼成して、誘電体層間に内部電極が形成された積層体を得る工程と、
を備える積層セラミックコンデンサの製造方法であって、
TiおよびZrの合計含有量を100モル部としたときの、各元素の含有モル部が、
La:2〜6モル部、
Mg:3〜5モル部、
Mn:1.5〜3モル部
であることを特徴とする積層セラミックコンデンサの製造方法。 - TiおよびZrの合計含有量を100モル部としたときの、Laの含有モル部が4〜6モル部であることを特徴とする、請求項11に記載の積層セラミックコンデンサの製造方法。
- Laの含有量を100モル部としたときの、Ce、Pr、およびNdの合計含有量が20モル部以下(0モル部を含む)であることを特徴とする、請求項11または12に記載の積層セラミックコンデンサの製造方法。
- Laの含有量を100モル部としたときの、Sm、Eu、Gd、Tb、Dy、Y、Ho、およびErの合計含有量が10モル部以下(0モル部を含む)であることを特徴とする、請求項11ないし13のいずれか1項に記載の積層セラミックコンデンサの製造方法。
- Laの含有量を100モル部としたときの、Tm、Yb、およびLuの合計含有量が5モル部以下(0モル部を含む)であることを特徴とする、請求項11ないし14のいずれか1項に記載の積層セラミックコンデンサの製造方法。
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