JP7365488B2 - コンデンサ - Google Patents
コンデンサ Download PDFInfo
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- JP7365488B2 JP7365488B2 JP2022503199A JP2022503199A JP7365488B2 JP 7365488 B2 JP7365488 B2 JP 7365488B2 JP 2022503199 A JP2022503199 A JP 2022503199A JP 2022503199 A JP2022503199 A JP 2022503199A JP 7365488 B2 JP7365488 B2 JP 7365488B2
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- Prior art keywords
- crystal
- capacitor
- crystal grains
- particle
- dielectric layer
- Prior art date
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- 239000003990 capacitor Substances 0.000 title claims description 40
- 239000013078 crystal Substances 0.000 claims description 124
- 239000002245 particle Substances 0.000 claims description 99
- 239000000654 additive Substances 0.000 claims description 31
- 230000000996 additive effect Effects 0.000 claims description 30
- 229910002113 barium titanate Inorganic materials 0.000 claims description 15
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 15
- 239000011777 magnesium Substances 0.000 claims description 8
- 239000011575 calcium Substances 0.000 claims description 5
- 239000011258 core-shell material Substances 0.000 claims description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 description 20
- 239000000843 powder Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 230000006866 deterioration Effects 0.000 description 8
- 238000007747 plating Methods 0.000 description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000000635 electron micrograph Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000010191 image analysis Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910018068 Li 2 O Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000007606 doctor blade method Methods 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 238000000921 elemental analysis Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- UODXCYZDMHPIJE-UHFFFAOYSA-N menthanol Chemical compound CC1CCC(C(C)(C)O)CC1 UODXCYZDMHPIJE-UHFFFAOYSA-N 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000010405 reoxidation reaction Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- -1 and for example Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011656 manganese carbonate Substances 0.000 description 1
- 229940093474 manganese carbonate Drugs 0.000 description 1
- 235000006748 manganese carbonate Nutrition 0.000 description 1
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 1
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
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- C04B35/01—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
- 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
- C04B35/462—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
- 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
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- 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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- C04B2235/78—Grain sizes and shapes, product microstructures, e.g. acicular grains, equiaxed grains, platelet-structures
- C04B2235/782—Grain size distributions
- C04B2235/783—Bimodal, multi-modal or multi-fractional
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- 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
- C04B2235/78—Grain sizes and shapes, product microstructures, e.g. acicular grains, equiaxed grains, platelet-structures
- C04B2235/785—Submicron sized grains, i.e. from 0,1 to 1 micron
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B2235/79—Non-stoichiometric products, e.g. perovskites (ABO3) with an A/B-ratio other than 1
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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
- C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
- C04B2235/85—Intergranular or grain boundary phases
-
- 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
Description
前記積層体の表面に位置し、前記内部電極層に電気的に接続された外部電極と、を有するコンデンサであって、
前記誘電体層は、チタン酸バリウムと添加物元素とを含む複数の結晶粒子で構成されており、
前記複数の結晶粒子は、第1結晶粒子と、前記第1結晶粒子より粒子径が大きい第2結晶粒子とを含み、
前記第1結晶粒子の粒子径をd1とし、前記第2結晶粒子の粒子径をd2としたとき、0.13μm≦d1<0.30μmであり、0.30μm≦d2<0.50μmであり、
前記第2結晶粒子の添加物元素含有量が、前記第1結晶粒子の添加物元素含有量より多く、
前記誘電体層の断面における、単位面積あたりの前記第2結晶粒子が占める面積の割合が、4%以上18%以下である。
チタン酸バリウムの原料粉末には、Ba/Ti比が1.006のもの(原料1)とBa/Ti比が1.000のもの(原料2)を用いた。原料1および原料2の平均粒子径は、それぞれ0.15μmおよび0.3μmとした。添加物元素には、ジプロシウムとマグネシウムとをそれぞれDy2O3、Mg2CO3として添加した。その他の添加剤として、炭酸カルシウム粉末(CaCO3)、炭酸マンガン粉末(MnCO3)およびガラス粉末(SiO2=55mol%、BaO=20mol%、CaO=15mol%、Li2O3=10mol%の組成を有するもの)を用いた。これらを直径5mmのジルコニアボールを用いて、溶媒としてトルエンとアルコールとからなる混合溶媒を添加し湿式混合した。
前記積層体の表面に位置し、前記内部電極層に電気的に接続された外部電極と、を有するコンデンサであって、
前記誘電体層は、チタン酸バリウムと添加物元素とを含む複数の結晶粒子で構成されており、
前記複数の結晶粒子は、第1結晶粒子と、前記第1結晶粒子より粒子径が大きい第2結晶粒子とを含み、
前記第1結晶粒子の粒子径をd1とし、前記第2結晶粒子の粒子径をd2としたとき、0.13μm≦d1<0.30μmであり、0.30μm≦d2<0.50μmであり、
前記第2結晶粒子の添加物元素含有量が、前記第1結晶粒子の添加物元素含有量より多い構成である。
3 外部電極
5 誘電体層
6 結晶粒子
6A 第1結晶粒子
6B 第2結晶粒子
7 内部電極層
6B1 コア部
6B2 シェル部
100 コンデンサ
Claims (5)
- 誘電体層と内部電極層とが交互に積層された積層体と、
前記積層体の表面に位置し、前記内部電極層に電気的に接続された外部電極と、を有するコンデンサであって、
前記誘電体層は、チタン酸バリウムと添加物元素とを含む複数の結晶粒子で構成されており、
前記複数の結晶粒子は、第1結晶粒子と、前記第1結晶粒子より粒子径が大きい第2結晶粒子とを含み、
前記第1結晶粒子の粒子径をd1とし、前記第2結晶粒子の粒子径をd2としたとき、0.13μm≦d1<0.30μmであり、0.30μm≦d2<0.50μmであり、
前記第2結晶粒子の添加物元素含有量が、前記第1結晶粒子の添加物元素含有量より多く、
前記誘電体層の断面における、単位面積あたりの前記第2結晶粒子が占める面積の割合が、4%以上18%以下であるコンデンサ。 - 前記誘電体層の断面における、前記第2結晶粒子同士が連なる個数が2個以下である、請求項1に記載のコンデンサ。
- 前記第2結晶粒子は、チタン酸バリウム結晶で構成されるコア部と、前記コア部を取り囲み、チタン酸バリウム結晶に添加物元素が拡散したシェル部と、を含むコアシェル構造を有する、請求項1または2に記載のコンデンサ。
- 前記第1結晶粒子の算術平均粒子径をD1とし、前記第2結晶粒子の算術平均粒子径をD2としたとき、2D1≦D2<3D1である、請求項1~3のいずれか1つに記載のコンデンサ。
- 前記添加物元素が、ジスプロシウム、マグネシウムおよびカルシウムから選ばれる1種以上である、請求項1~4のいずれか1つに記載のコンデンサ。
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