WO2017163845A1 - 誘電体組成物、誘電体素子、電子部品及び積層電子部品 - Google Patents
誘電体組成物、誘電体素子、電子部品及び積層電子部品 Download PDFInfo
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Abstract
Description
これらの用途における、特に、車載用などを用途とする積層セラミックコンデンサでは、通常の積層セラミックコンデンサに比べて、より高温領域までの保証が求められることがあり、より高い信頼性が必要である。印加される電圧に対して破壊しない、つまり破壊電圧が高いことが必要である。また、上記のような高い電圧を印加する環境では、大きな静電容量を得るためには、直流電圧が印加された際の比誘電率の変化(以降、DCバイアス特性と記載)が小さいことが要求されている。
また、誘電体組成物中に揮発性の高いカリウムの欠陥が生成し易くなり、伝導電子が生じやすいため高い破壊電圧が得られ難いという問題点があった。
主成分が化学式(Sr1.00-(s+t)BasCat)6.00-xRx(Ti1.00-(a+d)ZraSid)x+2.00(Nb1.00-bTab)8.00-xO30.00で表され、
前記Rが
Y、La、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも一種の元素であり、
s、t、x、a、b、dが、
0≦s≦1.00、
0≦t≦1.00、
0≦s+t≦1.00、
0≦x≦3.00、
0.01≦a≦0.98、
0≦b≦1.00、
0.02≦d≦0.15
0.03≦a+d≦1.00
を満たすタングステンブロンズ型複合酸化物である主成分を有することを特徴とする。
主成分が化学式(Sr1.00-(s+t)BasCat)6.00-xRx(Ti1.00-(a+d)ZraSid)x+2.00(Nb1.00-bTab)8.00-xO30.00で表され、
前記Rが
Y、La、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも一種の元素であり、
s、t、x、a、b、dが、
0≦s≦1.00、
0≦t≦1.00、
0≦s+t≦1.00、
0≦x≦3.00、
0.01≦a≦0.98、
0≦b≦1.00、
0.02≦d≦0.15、
0.03≦a+d≦1.00
を満たすタングステンブロンズ型複合酸化物である主成分を有することを特徴とする。
積層セラミックコンデンサ試料に対し、25℃において、デジタルLCRメータ(YHP社製4284A)にて、周波数1kHz、入力信号レベル(測定電圧)1Vrmsの信号を入力し、静電容量Cを測定した。そして、比誘電率εs(単位なし)を、誘電体層の厚みと、有効電極面積と、測定の結果得られた静電容量C0とに基づき算出した。比誘電率は高いほうが好ましく、300以上を良好であると判断した。
積層セラミックコンデンサ試料に対し、25℃において、直流電圧30V/μmの電界印加状態を保持し、デジタルLCRメータ(YHP社製4284A)にて、周波数1kHz、入力信号レベル(測定電圧)1Vrmsの信号を入力し、静電容量CBiasを測定した。DCバイアス特性は0V/μmの電界下における静電容量C0に対する変化率として式1に基づき算出した。
DCバイアス特性={(CBias-C0)/C0}×100 ・・・(1)
本実施例では、DCバイアス特性が±20%以内を直流電圧の印加による比誘電率の低下が少なく良好であると判断した。
積層セラミックコンデンサ試料に対し、180℃及び200℃において、デジタル抵抗メータ(ADVANTEST社製R8340)にて、測定電圧30V(電界強度6V/μm)、測定時間60秒の条件で絶縁抵抗を測定した。コンデンサ試料の電極面積および誘電体層の厚みから比抵抗の値を算出した。比抵抗は高いほうが好ましく1.00×1012Ωcm以上より好ましくは9.00×1012Ωcm以上を良好であると判断した。比抵抗が低いとコンデンサとしては漏れ電流が大きくなり、電気回路において誤動作を起こしてしまう。
積層セラミックコンデンサ試料に対し、180℃及び200℃において、昇圧速度100V/secで直流電圧を印加し、漏れ電流が10mAを超えた電圧を誘電体層の厚みで割った値を耐電圧(単位はV/μm)とした。耐電圧は高い方が好ましく、150V/μm以上、より好ましくは155V/μm以上、さらに好ましくは160V/μm以上、特に好ましくは175V/μm以上を良好であると判断した。
なお、複数元素の組合せの例として実施例には、試料No.30のLaとSmの2種を用いた場合のみ記載しているが、3種、4種以上を組合せても同様な効果が得られることを確認している。
(比較例)
2 誘電体層
3 内部電極層
4 外部電極
10 コンデンサ素子本体
Claims (6)
- 主成分が化学式(Sr1.00-(s+t)BasCat)6.00-xRx(Ti1.00-(a+d)ZraSid)x+2.00(Nb1.00-bTab)8.00-xO30.00で表され、
前記Rが
Y、La、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Luから選ばれる少なくとも一種の元素であり、
s、t、x、a、b、dが、
0≦s≦1.00、
0≦t≦1.00、
0≦s+t≦1.00、
0≦x≦3.00、
0.01≦a≦0.98、
0≦b≦1.00、
0.02≦d≦0.15、
0.03≦a+d≦1.00
を満たすタングステンブロンズ型複合酸化物である主成分を有する誘電体組成物。 - 前記主成分100モルに対して、副成分としてMn、Mg、Co、V、W、Mo、Li、B、Alから選択される少なくとも一種を0.10モル以上20.00モル以下含むことを特徴とする請求項1に記載の誘電体組成物。
- 前記化学式中のZr置換量aが0.50≦a≦0.98であることを特徴とする請求項1記載の誘電体組成物。
- 請求項1~3のいずれかに記載の誘電体組成物を備える誘電体素子。
- 請求項1~3のいずれかに記載の誘電体組成物からなる誘電体層を備える電子部品。
- 請求項1~3のいずれかに記載の誘電体組成物からなる誘電体層と内部電極層とを交互に積層されてなる積層部分を有する積層電子部品。
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JP7035914B2 (ja) | 2018-08-31 | 2022-03-15 | Tdk株式会社 | 誘電体組成物および電子部品 |
JP2020037490A (ja) * | 2018-08-31 | 2020-03-12 | Tdk株式会社 | 誘電体組成物および電子部品 |
CN110894160B (zh) * | 2018-09-13 | 2022-02-18 | Tdk株式会社 | 电介质组合物及电子部件 |
CN110894159B (zh) * | 2018-09-13 | 2022-03-01 | Tdk株式会社 | 电介质组合物及电子部件 |
JP7099212B2 (ja) | 2018-09-13 | 2022-07-12 | Tdk株式会社 | 誘電体組成物および電子部品 |
CN110894160A (zh) * | 2018-09-13 | 2020-03-20 | Tdk株式会社 | 电介质组合物及电子部件 |
CN110894159A (zh) * | 2018-09-13 | 2020-03-20 | Tdk株式会社 | 电介质组合物及电子部件 |
JP7196484B2 (ja) | 2018-09-13 | 2022-12-27 | Tdk株式会社 | 誘電体組成物および電子部品 |
JP2020043299A (ja) * | 2018-09-13 | 2020-03-19 | Tdk株式会社 | 誘電体組成物および電子部品 |
JP2020043310A (ja) * | 2018-09-13 | 2020-03-19 | Tdk株式会社 | 誘電体組成物および電子部品 |
JP2020152622A (ja) * | 2019-03-22 | 2020-09-24 | Tdk株式会社 | 誘電体組成物および電子部品 |
JP7168914B2 (ja) | 2019-03-22 | 2022-11-10 | Tdk株式会社 | 誘電体組成物および電子部品 |
JP7338533B2 (ja) | 2020-03-30 | 2023-09-05 | Tdk株式会社 | 誘電体組成物および電子部品 |
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EP3434660B1 (en) | 2021-07-21 |
JPWO2017163845A1 (ja) | 2019-02-28 |
CN108779031A (zh) | 2018-11-09 |
EP3434660A4 (en) | 2019-11-27 |
US10513464B2 (en) | 2019-12-24 |
JP6809528B2 (ja) | 2021-01-06 |
US20190112235A1 (en) | 2019-04-18 |
EP3434660A1 (en) | 2019-01-30 |
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