JP6881433B2 - 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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- JP6881433B2 JP6881433B2 JP2018507184A JP2018507184A JP6881433B2 JP 6881433 B2 JP6881433 B2 JP 6881433B2 JP 2018507184 A JP2018507184 A JP 2018507184A JP 2018507184 A JP2018507184 A JP 2018507184A JP 6881433 B2 JP6881433 B2 JP 6881433B2
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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6565—Cooling rate
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
- H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1236—Ceramic dielectrics characterised by the ceramic dielectric material based on zirconium oxides or zirconates
- H01G4/1245—Ceramic dielectrics characterised by the ceramic dielectric material based on zirconium oxides or zirconates containing also titanates
Description
また、揮発性の高いアルカリ金属を含むことにより、高温で熱処理を行う脱バインダ工程や焼成工程、再酸化工程で、誘電体組成物中にアルカリ金属に起因した格子欠陥が生成し易く、高い耐電圧が得られ難いという問題点があった。このため、前記特許文献1においては、高温領域において、高い比誘電率と高い耐電圧についての技術の開示はなされていない。
主成分が (Sr1.00−s−tBasCat)6.00−xRx(Ti1.00−aZra)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が、0.70≦s≦1.00、0≦t≦0.30、0.70≦s+t≦1.00、0≦x≦0.50、0.10≦a≦1.00、0≦b≦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−tBasCat)6.00−xRx(Ti1.00−aZra)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が、0.70≦s≦1.00、0≦t≦0.30、0.70≦s+t≦1.00、0≦x≦0.50、0.10≦a≦1.00、0≦b≦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に対し、25℃及び200℃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Cとに基づき算出した。比誘電率は高いほうが好ましく、500以上を良好であると判断した。また、25℃の比誘電率ε25℃に対する200℃の比誘電率ε200℃の変化率を式1に基づき算出した。
比誘電率温度変化率={(ε200℃−ε25℃)/ε25℃}×100 ・・・(1)本実施例では、比誘電率変化率が±20%以内を良好と判断した。
積層セラミックコンデンサ試料に対し、180℃、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、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℃、200℃において、100V/sec昇圧速度で直流電圧を印加し、漏れ電流が10mAを超えたところを直流耐電圧とした。直流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。
(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−tBasCat)6.00−xRx(Ti1.00 −aZra)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が、
0.70≦s≦1.00、
0≦t≦0.30、
0.70≦s+t≦1.00、
0.25≦x≦0.50、
0.10≦a≦1.00、
0≦b≦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、Si、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≦1.00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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