JP4999987B2 - 積層セラミックコンデンサ - Google Patents
積層セラミックコンデンサ Download PDFInfo
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- JP4999987B2 JP4999987B2 JP2010505598A JP2010505598A JP4999987B2 JP 4999987 B2 JP4999987 B2 JP 4999987B2 JP 2010505598 A JP2010505598 A JP 2010505598A JP 2010505598 A JP2010505598 A JP 2010505598A JP 4999987 B2 JP4999987 B2 JP 4999987B2
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- 239000003985 ceramic capacitor Substances 0.000 title claims description 62
- 239000013078 crystal Substances 0.000 claims description 191
- 239000002245 particle Substances 0.000 claims description 145
- 239000000919 ceramic Substances 0.000 claims description 91
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 83
- 239000011572 manganese Substances 0.000 claims description 69
- 229910002113 barium titanate Inorganic materials 0.000 claims description 60
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 60
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 57
- 229910052748 manganese Inorganic materials 0.000 claims description 57
- 239000011575 calcium Substances 0.000 claims description 45
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 37
- 229910052791 calcium Inorganic materials 0.000 claims description 37
- 239000011777 magnesium Substances 0.000 claims description 26
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 25
- 229910052749 magnesium Inorganic materials 0.000 claims description 25
- 229910052771 Terbium Inorganic materials 0.000 claims description 24
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 claims description 24
- 229910052720 vanadium Inorganic materials 0.000 claims description 20
- 229910052719 titanium Inorganic materials 0.000 claims description 18
- 239000010936 titanium Substances 0.000 claims description 18
- 229910052727 yttrium Inorganic materials 0.000 claims description 17
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 17
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 16
- 229910052691 Erbium Inorganic materials 0.000 claims description 15
- 229910052689 Holmium Inorganic materials 0.000 claims description 15
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 15
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 14
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 claims description 14
- 238000002441 X-ray diffraction Methods 0.000 claims description 12
- 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 10
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000843 powder Substances 0.000 description 103
- 239000010410 layer Substances 0.000 description 50
- 239000002344 surface layer Substances 0.000 description 28
- 238000012360 testing method Methods 0.000 description 24
- 239000003990 capacitor Substances 0.000 description 16
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 16
- 239000000654 additive Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- 239000011258 core-shell material Substances 0.000 description 11
- 238000010304 firing Methods 0.000 description 11
- 230000000996 additive effect Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 8
- 239000006104 solid solution Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 238000005498 polishing Methods 0.000 description 7
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000000921 elemental analysis Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000000992 sputter etching Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 238000009616 inductively coupled plasma Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229910052573 porcelain Inorganic materials 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000010405 reoxidation reaction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 1
- PPNAOCWZXJOHFK-UHFFFAOYSA-N manganese(2+);oxygen(2-) Chemical class [O-2].[Mn+2] PPNAOCWZXJOHFK-UHFFFAOYSA-N 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
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- C04B35/465—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates
- C04B35/468—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
- C04B35/4682—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates based on BaTiO3 perovskite phase
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- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
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Description
まず、原料粉末として、BT粉末,BCT粉末(組成は(Ba1-xCax)TiO3、X=0.05),MgO粉末,Y2O3粉末,Dy2O3粉末,Ho2O3粉末,Er2O3粉末,Tb4O7粉末,MnCO3粉末およびV2O5粉末を準備した。
次に、得られた積層セラミックコンデンサについて、以下の評価を行った。
(比誘電率および誘電損失)
比誘電率および誘電損失は、静電容量を温度25℃、周波数1.0kHz、測定電圧を0.01Vrmsまたは1Vrmsとして測定し、誘電体層の厚みと内部電極層の有効面積から求めた。この比誘電率および誘電損失の評価は、試料数20個とし、その平均値から求めた。また、比誘電率の評価において、標準偏差σを求め、上記平均値xから変動係数(σ/x)を求めた。
比誘電率の温度特性は、静電容量を温度−55〜150℃の範囲で測定した。比誘電率の温度特性は、X6S(−55〜105℃の範囲において、25℃を基準にしたときに±22%以内)を満足する場合を○、満足しない場合を×とした。この比誘電率の温度特性の評価は、試料数10個とし、その平均値から求めた。
キュリー温度は、比誘電率の温度特性を測定した範囲において、比誘電率が最大となる温度として求めた。
高温負荷試験は、温度105℃または125℃、印加電圧6V/μm、1000時間の条件で行った。高温負荷試験での試料数は、各試料20個とし、1000時間まで不良の無かったものを良品とした。なお、前記温度は、試料No.1〜80については105℃、試料No.81〜110については125℃で行った。
誘電体層を構成する結晶粒子の平均粒径は、以下のようにして求めた。まず、焼成後のコンデンサ本体である試料の破断面を研磨した後、走査型電子顕微鏡を用いて内部組織の写真を撮った(倍率:30,000倍)。次に、その写真上で結晶粒子が20〜30個入る円を描き、円内および円周にかかった結晶粒子を選択した。そして、各結晶粒子の輪郭を画像処理して各粒子の面積を求め、同じ面積をもつ円に置き換えたときの直径を算出し、その平均値より前記平均粒径を求めた。
結晶粒子中のカルシウムの濃度については、積層セラミックコンデンサを構成する誘電体層の断面をイオンミリングにより観察できる程度にまで研磨した研磨面に存在する結晶粒子に対して、元素分析機器を付設した透過型電子顕微鏡を用いて元素分析を行い求めた。
立方晶のチタン酸バリウムを示す(200)面の回折強度と、正方晶のチタン酸バリウムを示す(002)面の回折強度との比の測定は、Cukαの管球を備えたX線回折装置を用いて、角度2θ=44〜46°の範囲で測定し、ピーク強度の比から求めた。
結晶粒子に含まれる希土類元素およびマンガンの濃度の測定は、元素分析器(EDS)を付設した透過電子顕微鏡を用いて行った。分析する試料は、積層セラミックコンデンサを積層方向にイオンミリングにより観察できる程度にまで研磨し、その研磨した誘電体層の表面において、前述のカルシウムの濃度の測定により判定した第1の結晶粒子および第2の結晶粒子をそれぞれ抽出した。
得られた焼結体である試料の組成分析は、ICP(Inductively Coupled Plasma)分析もしくは原子吸光分析により行った。この場合、得られた誘電体磁器を硼酸と炭酸ナトリウムと混合し、溶融させたものを塩酸に溶解させて、まず、原子吸光分析により誘電体磁器に含まれる元素の定性分析を行った。次いで、特定した各元素について標準液を希釈したものを標準試料として、ICP発光分光分析にかけて定量化した。また、各元素の価数を周期表に示される価数として酸素量を求めた。
Claims (6)
- チタン酸バリウムを主成分とし、カルシウム,マグネシウム,バナジウム,マンガンおよびテルビウムと、イットリウム,ディスプロシウム,ホルミウムおよびエルビウムから選ばれる少なくとも1種の希土類元素とを含む誘電体磁器からなる誘電体層と、
内部電極層とを交互に積層してなる積層セラミックコンデンサであって、
前記誘電体磁器が、前記チタン酸バリウムを構成するチタン100モルに対して、
前記バナジウムをV2O5換算で0.02〜0.2モル、
前記マグネシウムをMgO換算で0.2〜0.8モル、
前記マンガンをMnO換算で0.1〜0.5モル、
イットリウム,ディスプロシウム,ホルミウムおよびエルビウムから選ばれる少なくとも1種の前記希土類元素をRE2O3換算で0.3〜0.8モル、
および前記テルビウムをTb4O7換算で0.02〜0.2モル含有するとともに、
前記誘電体磁器を構成する結晶が、前記チタン酸バリウムを主成分とし、前記カルシウムの濃度が0.2原子%以下である第1の結晶粒子からなる第1の結晶群と、前記チタン酸バリウムを主成分とし、前記カルシウムの濃度が0.4原子%以上である第2の結晶粒子からなる第2の結晶群とを有し、
前記誘電体磁器の研磨面に見られる前記第1の結晶粒子の面積をC1、前記第2の結晶粒子の面積をC2としたときに、C2/(C1+C2)が0.3〜0.7であり、
前記誘電体磁器のX線回折チャートにおいて、立方晶のチタン酸バリウムを示す(200)面の回折強度が、正方晶のチタン酸バリウムを示す(002)面の回折強度よりも大きく、
かつキュリー温度が95〜105℃であることを特徴とする積層セラミックコンデンサ。 - 前記第1の結晶粒子および前記第2の結晶粒子の平均粒径が0.14〜0.28μmであることを特徴とする請求項1に記載の積層セラミックコンデンサ。
- 前記C2/(C1+C2)が0.4〜0.6であることを特徴とする請求項1に記載の積層セラミックコンデンサ。
- 前記誘電体磁器が、前記チタン酸バリウムを構成するチタン100モルに対して、
前記バナジウムをV2O5換算で0.02〜0.08モル、
前記マグネシウムをMgO換算で0.3〜0.6モル、
前記マンガンをMnO換算で0.2〜0.4モル、
イットリウム,ディスプロシウム,ホルミウムおよびエルビウムから選ばれる少なくとも1種の前記希土類元素をRE2O3換算で0.4〜0.6モル、
および前記テルビウムをTb4O7換算で0.02〜0.08モル含有することを特徴とする請求項1または3に記載の積層セラミックコンデンサ。 - 前記誘電体磁器が、前記チタン酸バリウムを構成するチタン100モルに対して、前記テルビウムをTb4O7換算で0.05〜0.08モル含有することを特徴とする請求項1に記載の積層セラミックコンデンサ。
- 前記誘電体磁器が、前記チタン酸バリウムを構成するチタン100モルに対して、
前記バナジウムをV2O5換算で0.05〜0.1モル、
前記マグネシウムをMgO換算で0.2〜0.8モル、
前記マンガンをMnO換算で0.2〜0.3モル、
イットリウム,ディスプロシウム,ホルミウムおよびエルビウムから選ばれる少なくとも1種の前記希土類元素をRE2O3換算で0.4〜0.6モル、
および前記テルビウムをTb4O7換算で0.05〜0.1モル含有するとともに、
前記第1の結晶粒子および前記第2の結晶粒子の平均粒径が0.14〜0.19μmであることを特徴とする請求項1に記載の積層セラミックコンデンサ。
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