JP5067541B2 - 誘電体磁器組成物、複合電子部品および積層セラミックコンデンサ - Google Patents
誘電体磁器組成物、複合電子部品および積層セラミックコンデンサ Download PDFInfo
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- JP5067541B2 JP5067541B2 JP2007095398A JP2007095398A JP5067541B2 JP 5067541 B2 JP5067541 B2 JP 5067541B2 JP 2007095398 A JP2007095398 A JP 2007095398A JP 2007095398 A JP2007095398 A JP 2007095398A JP 5067541 B2 JP5067541 B2 JP 5067541B2
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- 239000000203 mixture Substances 0.000 title claims description 58
- 239000000919 ceramic Substances 0.000 title claims description 48
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- 239000003985 ceramic capacitor Substances 0.000 title claims description 14
- 239000011521 glass Substances 0.000 claims description 91
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- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 claims description 7
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- 238000009413 insulation Methods 0.000 description 19
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- 239000000696 magnetic material Substances 0.000 description 10
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 238000010030 laminating Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
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- 229910017518 Cu Zn Inorganic materials 0.000 description 4
- 229910017752 Cu-Zn Inorganic materials 0.000 description 4
- 229910017943 Cu—Zn Inorganic materials 0.000 description 4
- 229910018100 Ni-Sn Inorganic materials 0.000 description 4
- 229910018532 Ni—Sn Inorganic materials 0.000 description 4
- 229910052454 barium strontium titanate Inorganic materials 0.000 description 4
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 4
- 229910002113 barium titanate Inorganic materials 0.000 description 4
- AOWKSNWVBZGMTJ-UHFFFAOYSA-N calcium titanate Chemical compound [Ca+2].[O-][Ti]([O-])=O AOWKSNWVBZGMTJ-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000002003 electrode paste Substances 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910002367 SrTiO Inorganic materials 0.000 description 3
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- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 2
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- 239000011230 binding agent Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
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- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
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- 229910052737 gold Inorganic materials 0.000 description 2
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- 229910052748 manganese Inorganic materials 0.000 description 2
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- 229910052712 strontium Inorganic materials 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- -1 B 2 O 3: 20 wt% Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910018054 Ni-Cu Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910018481 Ni—Cu Inorganic materials 0.000 description 1
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 229910009369 Zn Mg Inorganic materials 0.000 description 1
- 229910007573 Zn-Mg Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Description
チタン酸ストロンチウムからなる主成分と、
副成分として、Bの酸化物を含むガラス成分と、Cuの酸化物と、Mnの酸化物と、からなる誘電体磁器組成物であって、
前記主成分100重量%に対して、前記ガラス成分の含有量が2〜5重量%、前記Cuの酸化物の含有量が、CuO換算で、0重量%より多く、10重量%以下、前記Mnの酸化物の含有量が、MnO換算で、0重量%より多く、1.5重量%以下であることを特徴とする。
コイル導体および磁性体層で構成されるコイル部と、
内部電極層および誘電体層で構成されるコンデンサ部と、を有する複合電子部品であって、
前記内部電極層が、導電材としてAgを含んでおり、
前記誘電体層が、上記のいずれかに記載の誘電体磁器組成物で構成されている。
内部電極層と、誘電体層と、が交互に積層された積層セラミックコンデンサであって、
前記内部電極層が、導電材としてAgを含んでおり、
前記誘電体層が、上記のいずれかに記載の誘電体磁器組成物で構成されている。
図1は本発明の一実施形態に係る積層型フィルタの斜視図、
図2は図1に示すII−II線に沿う積層型フィルタの断面図、
図3は本発明の一実施形態に係る積層型フィルタの積層構造を示す分解斜視図、
図4(A)はT型の回路の回路図、図4(B)はπ型の回路の回路図、図4(C)はL型の回路の回路図、
図5は本発明のその他の実施形態に係る積層型フィルタの斜視図、
図6は本発明のその他の実施形態に係る積層型フィルタの積層構造を示す分解斜視図、
図7は本発明のその他の実施形態に係る積層セラミックコンデンサの断面図である。
図1に示すように、本発明の一実施形態に係る積層型フィルタ1は、本体積層部11を主要部とし、図示上の左側面に外部電極21,22,23、図示上の右側面に外部電極24,25,26を有している。積層型フィルタ1の形状に特に制限はないが、通常、直方体状とされる。また、その寸法にも特に制限はなく、用途に応じて適当な寸法とすればよいが、通常、(0.6〜5.6mm)×(0.3〜5.0mm)×(0.3〜1.9mm)程度である。まず、本実施形態に係る積層型フィルタの構造について説明する。
本実施形態の積層型フィルタは、従来の積層型フィルタと同様に、誘電体グリーンシートおよび磁性体グリーンシートを作製し、これらのグリーンシートを積層し、グリーン状態の本体積層部11を形成し、これを焼成した後、外部電極21〜26を形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。
まず、誘電体磁器組成物原料を構成する各主成分原料および、必要に応じて、その他の副成分原料を準備する。
ガラス成分は、該ガラス成分を構成する酸化物等の原料を混合して、焼成し、その後急冷し、ガラス化させることで得られる。
まず、磁性体層用ペーストに含まれる磁性体材料を準備し、これを塗料化して、磁性体層用ペーストを調整する。
なお、磁性体材料は、磁性体層用ペーストとする前に、磁性体材料を構成する各出発原料を仮焼合成等により、あらかじめ反応させておいてもよい。
次に、上記にて作製した各誘電体グリーンシートおよび磁性体グリーンシートを、順に積層し、グリーン状態の本体積層部11を形成する。
まず、最下層に内部電極を形成していない誘電体グリーンシート32cを配置する。内部電極を形成していない誘電体グリーンシート32cは、コンデンサ部を保護するために使用され、その厚みは、適宜調整すれば良い。
次に、誘電体グリーンシートおよび磁性体グリーンシートを順次積層することにより作製したグリーン状態の本体積層部を焼成する。焼成条件としては、昇温速度を好ましくは50〜500℃/時間、さらに好ましくは200〜300℃/時間、保持温度を好ましくは840〜900℃、温度保持時間を好ましくは0.5〜8時間、さらに好ましくは1〜3時間、冷却速度を好ましくは50〜500℃/時間、さらに好ましくは200〜300℃/時間とする。
そして、図5、図6に示す積層型フィルタ101は、図4(C)に示すL型の回路が4つ形成された構成となる。
まず、誘電体磁器組成物原料を構成する主成分原料として、SrTiO3と、副成分原料として、B2O3−ZnO−SiO2系ガラス、CuO、MnCO3とを準備した。なお、SrTiO3のA/B比、すなわち、Sr/Ti比は1.00とし、B2O3−ZnO−SiO2系ガラスのガラス軟化点は、630℃であった。また、MnCO3は、焼成後に、MnOとして誘電体磁器組成物中に含有されることとなる。
また、B2O3−ZnO−SiO2系ガラスは、市販のガラスを用いた。
なお、B2O3−ZnO−SiO2系ガラスの組成は、B2O3:20重量%、ZnO:65重量%、SiO2:15重量%であった。
電極を形成した焼結体に対し、基準温度20℃において、デジタルLCRメータ(YHP社製4274A)にて、周波数1MHz,入力信号レベル(測定電圧)1Vrms/μmの条件下で、静電容量Cを測定した。そして、得られた静電容量と、焼結体の電極面積および電極間距離とから、比誘電率(単位なし)を算出した。評価基準は、200以上を良好とした。結果を表1に示す。
比誘電率の測定条件と同条件下で、誘電損失(tanδ)を測定し、得られた誘電損失(tanδ)に基づいて、損失Q値(=1/tanδ)を算出した。損失Q値は、高い方が好ましい。評価基準は、200以上を良好とした。結果を表1に示す。
電極を形成した焼結体に対し、絶縁抵抗計(HEWLETT PACKARD社製E2377Aマルチメーター)を使用して、25℃においてDC25Vを30秒間印加した後の抵抗値を測定し、この測定値と、焼結体の電極面積および厚みとから、絶縁抵抗ρを算出した。本実施例では、20個の試料について測定を行い、その平均を求めることにより評価した。評価基準は、1.0×108Ω・m以上を良好とした。結果を表1に示す。
一方、ガラス成分の含有量が本発明の範囲よりも小さい場合には(試料1)、焼結しないため、特性が非常に劣っていることが確認できる。また、ガラス成分の含有量が本発明の範囲よりも大きい場合には(試料8および9)、比誘電率が低くなってしまう結果となった。
ガラス成分およびCuOの含有量を、表2に示す量とした以外は、試料2と同様にして、誘電体磁器組成物を作製し、実施例1と同様の評価を行った。結果を表2に示す。
MnOの含有量を、表3に示す量とした以外は、試料3と同様にして、誘電体磁器組成物を作製し、実施例1と同様の評価を行った。結果を表3に示す。
ガラス成分を、表4に示すガラス成分とした以外は、試料3と同様にして、誘電体磁器組成物を作製し、実施例1と同様の評価を行った。結果を表4に示す。
なお、B2O3−SiO2−BaO−CaO系ガラス(試料23)の組成は、B2O3:30重量%、SiO2:20重量%、BaO:25重量%、CaO:25重量%、
B2O3−ZnO−BaO系ガラス(試料24)の組成は、B2O3:30重量%、ZnO:30重量%、BaO:40重量%、
B2O3−ZnO系ガラス(試料25)の組成は、B2O3:65重量%、ZnO:35重量%、
B2O3−ZnO−SiO2−BaO系ガラス(試料26)の組成は、B2O3:45重量%、ZnO:20重量%、SiO2:5重量%、BaO:30重量%であった。
また、試料23〜26のガラス成分のガラス軟化点は、800℃以下であり、試料27のガラス成分(SiO2−Al2O3−BaO)のガラス軟化点は、800℃よりも高かった。
ガラス成分としてB2O3−ZnO系ガラスの含有量を表5に示す量とし(試料25および29)、このガラス成分を構成するB2O3およびZnOの酸化物としての含有量を表5に示す量として(試料28および30)、誘電体磁器組成物を作製し、実施例1と同様の評価を行った。結果を表5に示す。
したがって、本発明に係る誘電体磁器組成物を、LC複合電子部品に適用した場合であっても、コイル部を構成する磁性体層と同時焼成が可能となり、上記した良好な特性を示す誘電体層を有する複合電子部品を提供することができる。
また、本発明の誘電体磁器組成物は、内部電極層がAgで構成された積層セラミックコンデンサの誘電体層としても好適である。
11… 本体積層部
21〜26… 外部電極
30… コンデンサ部
31… 内部電極
32… 誘電体層
40… コイル部
41… コイル導体
42… 磁性体層
Claims (7)
- チタン酸ストロンチウムからなる主成分と、
副成分として、Bの酸化物を含むガラス成分と、Cuの酸化物と、Mnの酸化物と、からなる誘電体磁器組成物であって、
前記主成分100重量%に対して、前記ガラス成分の含有量が2〜5重量%、前記Cuの酸化物の含有量が、CuO換算で、0重量%より多く、10重量%以下、前記Mnの酸化物の含有量が、MnO換算で、0重量%より多く、1.5重量%以下であることを特徴とする誘電体磁器組成物。 - 前記ガラス成分が、Biの酸化物を含まないことを特徴とする請求項1に記載の誘電体磁器組成物。
- 前記ガラス成分の代わりに、前記ガラス成分を構成する各成分が、酸化物として含有されている請求項1または2に記載の誘電体磁器組成物。
- コイル導体および磁性体層で構成されるコイル部と、
内部電極層および誘電体層で構成されるコンデンサ部と、を有する複合電子部品であって、
前記内部電極層が、導電材としてAgを含んでおり、
前記誘電体層が、請求項1〜3のいずれかに記載の誘電体磁器組成物で構成されている複合電子部品。 - 前記誘電体層の厚みが20μm以下である請求項4に記載の複合電子部品。
- 内部電極層と、誘電体層と、が交互に積層してある素子本体を有する積層セラミックコンデンサであって、
前記内部電極層が、導電材としてAgを含んでおり、
前記誘電体層が、請求項1〜3のいずれかに記載の誘電体磁器組成物で構成されている積層セラミックコンデンサ。 - 前記誘電体層の厚みが20μm以下である請求項6に記載の積層セラミックコンデンサ。
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JP2007095398A JP5067541B2 (ja) | 2007-03-30 | 2007-03-30 | 誘電体磁器組成物、複合電子部品および積層セラミックコンデンサ |
TW097109123A TWI412046B (zh) | 2007-03-30 | 2008-03-14 | 介電體陶瓷器組合物、複合電子元件以及層積陶瓷電容元件 |
KR1020080028939A KR101181055B1 (ko) | 2007-03-30 | 2008-03-28 | 유전체 자기 조성물, 복합 전자 부품 및 적층 세라믹콘덴서 |
EP08153547A EP1978004A1 (en) | 2007-03-30 | 2008-03-28 | Dielectric ceramic composition, complex electronic device and multilayer ceramic capacitor |
US12/078,281 US7799718B2 (en) | 2007-03-30 | 2008-03-28 | Dielectric ceramic composition, complex electronic device and multilayer ceramic capacitor |
CNA2008100884774A CN101276660A (zh) | 2007-03-30 | 2008-03-31 | 电介质陶瓷组合物、复合电子部件和叠层陶瓷电容器 |
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JP4618383B2 (ja) * | 2008-05-12 | 2011-01-26 | Tdk株式会社 | 誘電体磁器組成物、積層複合電子部品、積層コモンモードフィルタ、積層セラミックコイルおよび積層セラミックコンデンサ |
US8178456B2 (en) * | 2008-07-08 | 2012-05-15 | Ian Burn Consulting, Inc. | Sintered dielectric ceramic, composition for making, and use thereof in multilayer capacitor and energy storage device |
EP2519089B1 (en) * | 2009-12-24 | 2017-09-13 | Murata Manufacturing Co., Ltd. | Circuit module |
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TW200849299A (en) | 2008-12-16 |
EP1978004A1 (en) | 2008-10-08 |
CN101276660A (zh) | 2008-10-01 |
US7799718B2 (en) | 2010-09-21 |
KR20080089254A (ko) | 2008-10-06 |
US20080254968A1 (en) | 2008-10-16 |
KR101181055B1 (ko) | 2012-09-07 |
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