JPWO2006132086A1 - 誘電体セラミック、及び積層セラミックコンデンサ - Google Patents
誘電体セラミック、及び積層セラミックコンデンサ Download PDFInfo
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- JPWO2006132086A1 JPWO2006132086A1 JP2007520054A JP2007520054A JPWO2006132086A1 JP WO2006132086 A1 JPWO2006132086 A1 JP WO2006132086A1 JP 2007520054 A JP2007520054 A JP 2007520054A JP 2007520054 A JP2007520054 A JP 2007520054A JP WO2006132086 A1 JPWO2006132086 A1 JP WO2006132086A1
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Abstract
Description
3 誘電体層
4、5 内部電極
8、9 外部電極
0.001≦x≦0.03…(2)
0≦t≦0.1…(3)
0≦u≦0.06…(4)
また、特定の希土類元素Reとしては、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、LuおよびYから選ばれる少なくとも1種を使用することができ、特定の金属元素Mとしては、Mn、Ni、Fe、Co、V、W、Cr、Mo、Alから選ばれる少なくとも1種を使用することができる。
0.1≦b≦0.6…(6)
0.1≦c≦1.5…(7)
0.1≦d≦2.0…(8)
本誘電体セラミックは、Cuが、主成分中のTi元素と同一サイト(以下、「Tiサイト」という。)に固溶しており、主成分を構成する主相粒子内に均一に存在している。
mは(Ba1-tCat)で表されるBaサイトとTiサイトとのモル比を示すが、モル比mが0.96未満の場合は静電容量の温度特性が悪化してJISに規定するB特性を満足しなくなり、さらには、高温負荷時の寿命低下を招くおそれがあり、信頼性を損なうおそれがある。一方、モル比mが1.02より大きくなると、比誘電率εrが2500未満に低下し、所望の高比誘電率を有する積層セラミックコンデンサを得ることができなくなる。
Tiサイト中のTiの一部をCuで置換し、CuをTiサイト中に固溶させて均一に分散させて存在させることにより、信頼性を損なうこともなく静電容量の経時変化を抑制することが可能となる。しかしながら、CuのTiサイト中のモル比xが0.001未満の場合は、Cuの含有量が少なすぎるため、所期の作用効果を発揮することができず、高温負荷時の寿命低下を招いたり静電容量の経時変化が大きくなるおそれがある。一方、モル比xが0.03を超えた場合は、Cuの含有量が過剰となってTiサイトに固溶しきれなくなったCuが結晶粒界に析出したり、或いは結晶粒内で均一に分散せずに偏在し、その結果高温負荷時の寿命低下を招いたり絶縁破壊電圧が低下し、信頼性を損なうおそれがある。
Baの一部を必要に応じてCaで置換し、用途に応じた誘電体セラミックを得るのも好ましいが、Baサイト中のCaのモル比tが0.1を超えると、比誘電率εrが2500未満に低下し、高比誘電率を有する積層セラミックコンデンサを得ることができなくなる。
Tiの一部を必要に応じてZrで置換し、用途に応じた誘電体セラミックを得るのも好ましいが、Tiサイト中のZrのモル比uが0.06を超えると、高温負荷時の寿命低下を招くおそれがあり、信頼性を損なうおそれがある。
誘電体セラミック中に特定の希土類元素Reを含有させることにより、誘電体セラミックの特性を向上させることができるが、主成分100モル部に対するモル部aが0.1未満の場合は、高温負荷時の寿命低下が顕著になり、信頼性を損なうおそれがある。一方、主成分100モル部に対するモル部aが1.5を超えると静電容量の温度特性が悪化し、好ましくない。
誘電体セラミック中に特定の金属元素Mを含有させ、これら金属元素Mを結晶粒内又は/及び結晶粒界に存在させることにより誘電体セラミックの特性を向上させることができるが、主成分100モル部に対するモル部bが0.1未満の場合は、高温負荷時の寿命低下を招き、信頼性を損なうおそれがある。また絶縁破壊電圧を低くなる。一方、主成分100モル部に対するモル部bが0.6を超えた場合も高温負荷時の寿命低下を招き、信頼性を損なうおそれがあり、また絶縁破壊電圧を低くなる。しかもこの場合は静電容量の経時変化も大きくなり、好ましくない。
特定の金属元素Mと同様、Mgを誘電体セラミック中に含有させ、これらMgを結晶粒内又は/及び結晶粒界に存在させることにより誘電体セラミックの特性を向上させることができるが、主成分100モル部に対するモル部cが0.1未満の場合は、高温負荷時の寿命低下が顕著になり、また静電容量の経時変化も大きくなる。一方、主成分100モル部に対するモル部cが1.5を超えると静電容量の温度特性が悪化し、好ましくない。
Siは焼結助剤としての作用効果を奏することから、結晶粒界中にSi成分を存在させることにより、焼結性を向上させることができるが、主成分100モル部に対するモル部dが0.1未満の場合は、高温負荷時の寿命低下を招き、信頼性を損なうおそれがある。一方、主成分100モル部に対するモル部dが2.0を超えた場合も高温負荷時の寿命低下が顕著になり、しかもこの場合は静電容量の経時変化が大きくなり、好ましくない。
Claims (3)
- 一般式:(Ba1-tCat)m(Ti1-u-xZruCux)O3(ただし、0.96≦m≦1.02、0.001≦x≦0.03、0≦t≦0.1、0≦u≦0.06)で表される化合物を主成分とすると共に、
副成分として、Re(ReはLa、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、LuおよびYから選ばれる少なくとも1種)、M(MはMn、Ni、Fe、Co、V、W、Cr、Mo、Alから選ばれる少なくとも1種)、MgおよびSiを含有し、
前記Cuが前記主成分を構成する主相粒子中に均一に分散して存在すると共に、前記各副成分の含有量が、前記主成分100モル部に対し、それぞれ
Re:0.1〜1.5モル部、
M :0.1〜0.6モル部、
Mg:0.1〜1.5モル部、
Si:0.1〜2.0モル部
であることを特徴とする誘電体セラミック。 - 前記Reが前記主相粒子に固溶している領域の平均値は、断面における面積比で40%以下であることを特徴とする請求項1記載の誘電体セラミック。
- 複数の誘電体層と内部電極とが交互に積層されたセラミック積層体が焼結されてなる積層焼結体と、該積層焼結体の外表面に形成された外部電極とを備えた積層セラミックコンデンサにおいて、
前記誘電体層が、請求項1又は請求項2記載の誘電体セラミックで形成されていることを特徴とする積層セラミックコンデンサ。
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TW200705484A (en) | 2007-02-01 |
WO2006132086A1 (ja) | 2006-12-14 |
CN101193836A (zh) | 2008-06-04 |
TWI298893B (ja) | 2008-07-11 |
KR100906079B1 (ko) | 2009-07-02 |
KR20080017344A (ko) | 2008-02-26 |
DE112006001440B4 (de) | 2010-06-02 |
JP4626892B2 (ja) | 2011-02-09 |
US20080112109A1 (en) | 2008-05-15 |
DE112006001440T5 (de) | 2008-04-17 |
CN101193836B (zh) | 2010-09-29 |
US7397649B2 (en) | 2008-07-08 |
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