JP4827011B2 - セラミック粉末及びこれを用いた誘電体ペースト、積層セラミック電子部品、その製造方法 - Google Patents
セラミック粉末及びこれを用いた誘電体ペースト、積層セラミック電子部品、その製造方法 Download PDFInfo
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- JP4827011B2 JP4827011B2 JP2006065944A JP2006065944A JP4827011B2 JP 4827011 B2 JP4827011 B2 JP 4827011B2 JP 2006065944 A JP2006065944 A JP 2006065944A JP 2006065944 A JP2006065944 A JP 2006065944A JP 4827011 B2 JP4827011 B2 JP 4827011B2
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- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 40
- 238000004458 analytical method Methods 0.000 claims description 34
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- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 14
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- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 description 1
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- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/761—Unit-cell parameters, e.g. lattice constants
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/762—Cubic symmetry, e.g. beta-SiC
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
- C04B2235/765—Tetragonal symmetry
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- Life Sciences & Earth Sciences (AREA)
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- Physics & Mathematics (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Description
粉末X線回折(XRD)測定は、粉末X線回折装置(リガク社製、商品名Rint2000)を用いて行い、リートベルト解析用のXRDプロファイルデータを得た。このとき、ステップ幅は0.01°、最大ピークカウントが約10000カウントとなるように電流、電圧を設定して測定を行った。
得られたXRDプロファイルについて、リートベルト解析用ソフトウエアRIETAN−2000(Rev.2.4.1)(ウインドウズ用)を用いて解析を行った。各相の質量分率を求めるにあたっては、マイクロアブソープション(Microabsorption)を補正して質量分率を求めた。
ペロブスカイト型結晶構造を有するチタン酸バリウム粉末(比表面積SSA6.16m2/g、走査型電子顕微鏡SEMによる平均粒径0.16μm)について、リートベルト法による解析を試みた。リートベルト解析としては、テトラゴナル相(正方晶)単相としての解析、キュービック相(立方晶)単相としての解析、テトラゴナル相(正方晶)+キュービック相(立方晶)の2相としての解析の3種類である。各解析における信頼度因子を表1に示す。
各種セラミック粉末(チタン酸バリウム粉末)を用い、前述した製造方法に準じて積層セラミックコンデンサを作製した(実施例1〜3、比較例1、2)。作製した積層セラミックコンデンサの寸法は、1.0mm×0.5mm×0.5mmであり、誘電体セラミック層の積層数は160、誘電体セラミック層1層あたりの厚みは1.6μm、内部電極層の厚みは1.0μmとした。使用したセラミック粉末の比表面積SSA、走査型電子顕微鏡SEMによる平均粒径(SEM径)、テトラゴナル相の含有量Wt、キュービック相の含有量Wc、これらの重量比率Wt/Wc(=X)、テトラゴナル相及びキュービック相の格子定数、作製した積層セラミックコンデンサの比誘電率、誘電損失、容量変化率ΔC/C(−25℃及び85℃)を表2に示す。
比表面積SSAの異なるセラミック粉末について、テトラゴナル相とキュービック相の重量比率Wt/Wc≧3の場合と、Wt/Wc<3の場合の特性を比較した。結果を表3に示す。
Claims (8)
- 誘電体セラミック層と内部電極層とが交互に積層された積層セラミック電子部品の前記誘電体セラミック層を形成するためのセラミック粉末であって、
組成式ABO 3 (式中、Aサイトは、Sr、Ca及びBaから選ばれる少なくとも1種の元素で構成される。Bサイトは、Ti及びZrから選ばれる少なくとも1種の元素で構成される。)で表されるペロブスカイト型結晶構造を有し、テトラゴナル相の含有量Wtとキュービック相の含有量Wcの重量比率Wt/WcをXとしたときに、3.2≦X≦5であることを特徴とするセラミック粉末。 - 前記テトラゴナル相の含有量Wtとキュービック相の含有量Wcは、リートベルト法による多相解析により求められた値であることを特徴とする請求項1記載のセラミック粉末。
- 比表面積が4〜10m2/gであることを特徴とする請求項1または2記載のセラミック粉末。
- チタン酸バリウム粉末を主成分とすることを特徴とする請求項1から3のいずれか1項記載のセラミック粉末。
- 誘電体セラミック層と内部電極層とが交互に積層された積層セラミック電子部品の前記誘電体セラミック層を形成するための誘電体ペーストであって、
セラミック粉末として請求項1から4のいずれか1項記載のセラミック粉末を含むことを特徴とする誘電体ペースト。 - 誘電体セラミック層と内部電極層とが交互に積層された積層セラミック電子部品であって、
前記誘電体セラミック層は、請求項5記載の誘電体ペーストにより誘電体グリーンシートを形成し、これを焼成することにより形成されることを特徴とする積層セラミック電子部品。 - 高誘電積層セラミックコンデンサであることを特徴とする請求項6記載の積層セラミック電子部品。
- 誘電体ペーストと導電ペーストにより誘電体グリーンシートと電極前駆体層とを交互に積層形成した後、これを焼成して積層セラミック電子部品とするに際し、
前記誘電体ペーストとして請求項5記載の誘電体ペーストを用いることを特徴とする積層セラミック電子部品の製造方法。
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TW096104225A TW200740712A (en) | 2006-03-10 | 2007-02-06 | Ceramic powder, dielectric paste using the same, laminated ceramic electronic part, and method for production thereof |
KR1020070020357A KR100832367B1 (ko) | 2006-03-10 | 2007-02-28 | 세라믹 분말 및 이것을 사용한 유전체 페이스트, 적층세라믹 전자부품, 그 제조방법 |
US11/714,133 US20070213201A1 (en) | 2006-03-10 | 2007-03-06 | Ceramic powder, dielectric paste using same, multilayer ceramic electronic component, and method for production thereof |
EP07250941A EP1832563A2 (en) | 2006-03-10 | 2007-03-07 | Ceramic powder, dielectric paste using same, multilayer ceramic electronic component, and method for production thereof |
CNA2007100860898A CN101034599A (zh) | 2006-03-10 | 2007-03-09 | 陶瓷粉末、电介质浆、层积陶瓷电子部件及其制造方法 |
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US8929054B2 (en) * | 2010-07-21 | 2015-01-06 | Cleanvolt Energy, Inc. | Use of organic and organometallic high dielectric constant material for improved energy storage devices and associated methods |
KR101486983B1 (ko) | 2011-08-02 | 2015-01-27 | 가부시키가이샤 무라타 세이사쿠쇼 | 적층 세라믹 콘덴서 |
JP7025695B2 (ja) * | 2018-01-31 | 2022-02-25 | Tdk株式会社 | 誘電体磁器組成物、電子部品および積層セラミックコンデンサ |
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KR20070092613A (ko) | 2007-09-13 |
KR100832367B1 (ko) | 2008-05-26 |
CN101034599A (zh) | 2007-09-12 |
US20070213201A1 (en) | 2007-09-13 |
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