JP2008094673A - 誘電体セラミック組成物、積層セラミックコンデンサ及びその製造方法 - Google Patents
誘電体セラミック組成物、積層セラミックコンデンサ及びその製造方法 Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 88
- 239000003985 ceramic capacitor Substances 0.000 title claims abstract description 51
- 239000000203 mixture Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 10
- 238000010304 firing Methods 0.000 claims description 9
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 229910052720 vanadium Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 150000002910 rare earth metals Chemical class 0.000 claims description 6
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 5
- 229910052691 Erbium Inorganic materials 0.000 claims description 5
- 229910052693 Europium Inorganic materials 0.000 claims description 5
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 5
- 229910052689 Holmium Inorganic materials 0.000 claims description 5
- 229910052772 Samarium Inorganic materials 0.000 claims description 5
- 229910052771 Terbium Inorganic materials 0.000 claims description 5
- 229910052775 Thulium Inorganic materials 0.000 claims description 5
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052727 yttrium Inorganic materials 0.000 claims description 5
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000000843 powder Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- ZTQSAGDEMFDKMZ-UHFFFAOYSA-N Butyraldehyde Chemical compound CCCC=O ZTQSAGDEMFDKMZ-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 101100170542 Mus musculus Disp1 gene Proteins 0.000 description 1
- 229910001128 Sn alloy Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [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
- 239000011324 bead Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
【解決手段】 誘電体セラミックスを形成する誘電体セラミック組成物が、BaTiO3+aMgO+bMOx+cReO3/2+dSiO2で表記したとき、BaTiO3 100molに対して0.4 ≦a≦ 3.0mol、0.05≦b≦ 4.0mol、6.0 ≦c≦16.5mol、3.0 ≦d≦ 5.0mol、2.0≦c/d≦3.3の範囲であることを特徴とする。
【選択図】 図1
Description
出発原料として、表1の組成比になるように、粒子径の平均値が0.45μmのBaTiO3と、MgO、Mn2O3(MnO3/2換算)、Ho2O3(HoO3/2換算)及びSiO2を秤量して準備した。なお、BaTiO3の粒子径の平均値は、SEM(走査電子顕微鏡)で粒子を観察して、一定方向で最大径を300個分測定して、この300個分の最大径を算術平均したものである。以降のBaTiO3の粒子径の平均値の表記も同様である。
表3の組成比になるように原料を準備し、実施例1と同様にして誘電体セラミック粉末を形成した。ここではHoをその他の希土類元素に変えてその効果を検証した。
表5の組成比になるように原料を準備し、実施例1と同様にして誘電体セラミック粉末を形成した。ここではMgの添加量をふってその効果を検証した。
表7の組成比になるように原料を準備し、実施例1と同様にして誘電体セラミック粉末を形成した。ここではMnの添加量及びMの種類を変えてその効果を検証した。
組成比を試料No.40と同様にして、BaTiO3について、その粒子径の平均値が表9に示したとおりのものを用意し、実施例1と同様にして誘電体セラミック粉末を形成した。次いでこの誘電体セラミック粉末を、実施例1と同様にして積層セラミックコンデンサを形成し、誘電率、温度特性(TC)、比抵抗及び寿命特性を測定し、表9にまとめた。
組成比が試料No.40と同様の誘電体セラミック組成物を用いて、実施例1と同様にして、積層セラミックコンデンサを形成した。そのときに焼成後に室温まで温度を下げる時の降温速度を、表10に示したとおりにふって、それぞれの試料について誘電率、温度特性(TC)、比抵抗及び寿命特性を測定し、表10にまとめた。
2 セラミック積層体
3 誘電体セラミックス
4 内部電極
5 外部電極
6 第一のメッキ層
7 第二のメッキ層
Claims (6)
- BaTiO3+aMgO+bMOx+cReO3/2+dSiO2
(ただし、MgOはMgO換算であることを示し、MOxはV、Cr及びMnから選ばれる少なくとも1種の金属の1分子中1原子の酸化物換算であることを示し、ReO3/2はSm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb及びYから選ばれる少なくとも1種類の希土類金属の1分子中1原子の酸化物換算であることを示し、SiO2はSiO2換算であることを示す。)
で表記したとき、
BaTiO3 100molに対して
0.4 ≦a≦ 3.0mol
0.05≦b≦ 4.0mol
6.0 ≦c≦16.5mol
3.0 ≦d≦ 5.0mol
2.0≦c/d≦3.3
の範囲であることを特徴とする誘電体セラミック組成物。 - 原料として用いるBaTiO3の粒子径の平均値が0.23〜0.35μmであることを特徴とする請求項1に記載の誘電体セラミック組成物。
- 略直方体形状のセラミック積層体と、該セラミック積層体中に誘電体セラミックスを介して対向しかつ交互に異なる端面へ引出されるように形成された内部電極と、前記セラミック積層体の両端面に形成され、該端面に引き出された前記内部電極のそれぞれに電気的に接続された外部電極と、を有する積層セラミックコンデンサにおいて、
前記誘電体セラミックスの原料となる誘電体セラミック組成物が
BaTiO3+aMgO+bMOx+cReO3/2+dSiO2
(ただし、MgOはMgO換算であることを示し、MOxはV、Cr及びMnから選ばれる少なくとも1種の金属の1分子中1原子の酸化物換算であることを示し、ReO3/2はSm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb及びYから選ばれる少なくとも1種類の希土類金属の1分子中1原子の酸化物換算であることを示し、SiO2はSiO2換算であることを示す。)
で表記したとき、
BaTiO3 100molに対して
0.4 ≦a≦ 3.0mol
0.05≦b≦ 4.0mol
6.0 ≦c≦16.5mol
3.0 ≦d≦ 5.0mol
2.0≦c/d≦3.3
の範囲であり、前記内部電極がNiまたはNi合金で形成されている
ことを特徴とする積層セラミックコンデンサ。 - 前記誘電体セラミックスの原料として用いるBaTiO3の粒子径の平均値が0.23〜0.35μmであることを特徴とする請求項3に記載の積層セラミックコンデンサ。
- 誘電体セラミック組成物をセラミックグリーンシートに成形するステップと、
前記セラミックグリーンシート上に内部電極を形成するステップと、
内部電極を形成した前記セラミックグリーンシートを積み重ねて未焼成セラミック積層体を形成するステップと、
前記未焼成セラミック積層体を焼成するステップと、
外部電極を形成するステップと、
を有する積層セラミックコンデンサの製造方法において、
前記誘電体セラミック組成物が
BaTiO3+aMgO+bMOx+cReO3/2+dSiO2
(ただし、MgOはMgO換算であることを示し、MOxはV、Cr及びMnから選ばれる少なくとも1種の金属の1分子中1原子の酸化物換算であることを示し、ReO3/2はSm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb及びYから選ばれる少なくとも1種類の希土類金属の1分子中1原子の酸化物換算であることを示し、SiO2はSiO2換算であることを示す。)
で表記したとき、
BaTiO3 100molに対して
0.4 ≦a≦ 3.0mol
0.05≦b≦ 4.0mol
6.0 ≦c≦16.5mol
3.0 ≦d≦ 5.0mol
2.0≦c/d≦3.3
の範囲である
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。 - 前記未焼成セラミック積層体を焼成するステップにおいて、焼成温度から室温まで温度を下げるときに、降温速度を100℃/hr〜500℃/hrとしたことを特徴とする請求項5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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