JP5409443B2 - 積層セラミックコンデンサ - Google Patents
積層セラミックコンデンサ Download PDFInfo
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- JP5409443B2 JP5409443B2 JP2010046121A JP2010046121A JP5409443B2 JP 5409443 B2 JP5409443 B2 JP 5409443B2 JP 2010046121 A JP2010046121 A JP 2010046121A JP 2010046121 A JP2010046121 A JP 2010046121A JP 5409443 B2 JP5409443 B2 JP 5409443B2
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- 239000003985 ceramic capacitor Substances 0.000 title claims description 28
- 239000000919 ceramic Substances 0.000 claims description 75
- 239000013078 crystal Substances 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 claims description 14
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 4
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 4
- 229910052693 Europium Inorganic materials 0.000 claims description 4
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 4
- 229910052779 Neodymium Inorganic materials 0.000 claims description 4
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 4
- 229910052772 Samarium Inorganic materials 0.000 claims description 4
- 229910052771 Terbium Inorganic materials 0.000 claims description 4
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- 229910052689 Holmium Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 28
- 239000002245 particle Substances 0.000 description 19
- 239000002994 raw material Substances 0.000 description 13
- 238000010304 firing Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 230000005684 electric field Effects 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 150000002902 organometallic compounds Chemical class 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 238000010532 solid phase synthesis reaction Methods 0.000 description 2
- 238000012916 structural analysis Methods 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical group [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
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- C04B35/4682—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates based on BaTiO3 perovskite phase
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Description
この発明に係る積層セラミックコンデンサは、誘電体セラミック層が、厚み1μm未満であり、かつ以下の誘電体セラミックの焼結体からなることを特徴としている。
すなわち、上記誘電体セラミックは、一般式:(Ba1-x/100Cax/100)mTiO3(ただし、0≦x≦20、0.99≦m≦1.04)で表わされる化合物を主成分とし、aMg−bSi−cMn−dR(ただし、Rは、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、DyおよびHoから選ばれる少なくとも1種であり、a、b、cおよびd[モル部]が、前記主成分100モル部に対して、それぞれ、0.1<a≦20.0、0.5<b≦20.0、0.1<c≦10.0、および1.0<d≦30.0の各条件を満たす。)を副成分として含み、かつ、当該誘電体セラミックを焼成して得られた焼結体における結晶粒子の平均粒径が20nm以上かつ100nm未満であることを特徴としている。
(A)誘電体セラミック原料の作製
出発原料として、微粒のBaCO3、CaCO3およびTiO2の各粉末を用意した。次に、これら粉末を、主成分である(Ba1-x/100Cax/100)1.01TiO3の組成となるように秤量した後、ボールミルで混合した。ここで、Ca量xについては、表1の「Ca量x」の欄に示すとおりとした。
上記セラミック原料粉末に、ポリビニルブチラール系バインダおよびエタノールを加えて、ボールミルにより24時間湿式混合した後、フィルタリングを行なうことによって、所定の範囲内の粒径以外の粒径を有する粉末を排除したセラミックスラリーを作製した。
[平均粒径]
各試料に係る積層セラミックコンデンサを破断し、1000℃の温度でサーマルエッチングを行ない、破断面を、走査型顕微鏡を用いて観察した。そして、得られた観察像に現れた結晶粒子について画像解析を行ない、結晶粒子の円相当径を粒径として、結晶粒子の粒径を測定した。ここで、各試料につき、300個の結晶粒子の粒径を測定し、その平均値を求めた。
温度105℃にて、各試料に係る積層セラミックコンデンサに、6.3kV/mmおよび12.6kV/mmの各電界強度となるようにDC電圧を印加する、高温負荷寿命試験を実施した。ここで、各試料につき、100個の試料に対して高温負荷寿命試験を実施し、1000時間経過するまでに、絶縁抵抗値が100kΩ以下になった試料を不良と判定し、試料数100個中の不良個数を求めた。
試料1〜25のいずれも、セラミック層厚は1μm以下であった。
実験例2では、不純物の影響を評価した。
組成式:100(Ba0.95Ca0.05)TiO3+2.0MgO+1.8SiO2+1.0MnO+8.0DyO3/2で表わされる組成に、表3に示した不純物成分を加えたことを除いて、実験例1の場合と同様の操作を経て、誘電体セラミック原料を得た。
上記誘電体セラミック原料を用い、実験例1の場合と同様にして、各試料に係る積層セラミックコンデンサを作製した。内部電極間に介在する誘電体セラミック層の厚みは、表4の「セラミック層厚」に示すとおりであった。
実験例1の場合と同様にして、セラミック構造分析および特性評価を行なった。その結果が表4に示されている。
表4からわかるように、不純物が混入した試料101〜110のいずれにおいても、セラミック層厚は1μm以下であり、平均粒径が20nm以上かつ100nm未満であり、電界強度6.3kV/mmおよび12.6kV/mmの双方において、高温負荷寿命試験での不良個数が0であり、高い信頼性を示した。
2 誘電体セラミック層
3,4 内部電極
5 コンデンサ本体
6,7 外部電極
Claims (1)
- 積層された複数の誘電体セラミック層、および前記誘電体セラミック層間の特定の界面に沿って形成された複数の内部電極をもって構成される、コンデンサ本体と、
前記コンデンサ本体の外表面上の互いに異なる位置に形成され、かつ前記内部電極の特定のものに電気的に接続される、複数の外部電極と
を備え、
前記誘電体セラミック層は、厚みが1μm未満であり、かつ、
一般式:(Ba1-x/100Cax/100)mTiO3(ただし、0≦x≦20、0.99≦m≦1.04)で表わされる化合物を主成分とし、
aMg−bSi−cMn−dR(ただし、Rは、La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、DyおよびHoから選ばれる少なくとも1種であり、a、b、cおよびd[モル部]が、前記主成分100モル部に対して、それぞれ、0.1<a≦20.0、0.5<b≦20.0、0.1<c≦10.0、および1.0<d≦30.0の各条件を満たす。)を副成分として含む誘電体セラミックの焼結体からなり、かつ、
当該焼結体における結晶粒子の平均粒径が20nm以上かつ100nm未満である、
積層セラミックコンデンサ。
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