JP2014239226A - 積層セラミックコンデンサ、誘電体セラミックおよび積層セラミックコンデンサの製造方法 - Google Patents
積層セラミックコンデンサ、誘電体セラミックおよび積層セラミックコンデンサの製造方法 Download PDFInfo
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- JP2014239226A JP2014239226A JP2014128102A JP2014128102A JP2014239226A JP 2014239226 A JP2014239226 A JP 2014239226A JP 2014128102 A JP2014128102 A JP 2014128102A JP 2014128102 A JP2014128102 A JP 2014128102A JP 2014239226 A JP2014239226 A JP 2014239226A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 95
- 239000003985 ceramic capacitor Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 42
- 229910052788 barium Inorganic materials 0.000 claims abstract description 38
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 24
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 24
- 150000001875 compounds Chemical class 0.000 claims abstract description 22
- 239000013078 crystal Substances 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims description 25
- 238000010304 firing Methods 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 229910052700 potassium Inorganic materials 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 abstract description 4
- 238000001354 calcination Methods 0.000 abstract description 2
- 229910052708 sodium Inorganic materials 0.000 description 6
- 238000007747 plating Methods 0.000 description 5
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 3
- 229910002113 barium titanate Inorganic materials 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
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- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 2
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 229910010293 ceramic material Inorganic materials 0.000 description 1
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- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
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- 150000002739 metals Chemical class 0.000 description 1
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- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
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- 238000007650 screen-printing Methods 0.000 description 1
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- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
まず、水熱合成法を利用してチタン酸バリウムの微粒粉末を作製し、これを仮焼することで、主成分粉末を得る。水熱合成法は、微粒の原料粉末を得るのに適した方法であるが、固相合成法を用いても構わない。
まず、水熱合成法を利用してチタン酸バリウムの微粒粉末を作製し、これを仮焼することで、所定の平均粒子径を有する主成分粉末を得た。
が確認された。
Claims (6)
- 積層された複数の誘電体セラミック層と、前記誘電体セラミック層間の界面に沿って形成される複数の内部電極とを備える積層体と、前記積層体の外表面上に形成された外部電極と、を含む積層セラミックコンデンサにおいて、
前記積層体の組成が、BaおよびTiを含むペロブスカイト型化合物(ただし、Baの一部はCaで置換されていても良く、Tiの一部はZrで置換されていても良い)を主成分とし、さらに、Q(QはBa、CaおよびSrのうちの少なくとも一種)とBiとを含み、
TiおよびZrの合計含有量を100モル部としたときの、(Ba、Ca、SrおよびBiの合計含有量−TiおよびZrの合計含有量)が3モル部以上であり、
前記誘電体セラミック層の結晶粒径が30nm以上150nm以下であること
を特徴とする積層セラミックコンデンサ。 - 前記積層体の組成が、TiおよびZrの合計含有量を100モル部としたときの、(Ba、Ca、SrおよびBiの合計含有量−TiおよびZrの合計含有量)が12モル部以下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。
- BaおよびTiを含むペロブスカイト型化合物(ただし、Tiの一部はZrで置換されていても良い)を主成分とし、さらに、Q(QはBa、CaおよびSrのうちの少なくとも一種)とBiとを含む誘電体セラミックであって、
TiおよびZrの合計含有量を100モル部としたときの、(Ba、Ca、SrおよびBiの合計含有量−TiおよびZrの合計含有量)が3モル部以上であり、
前記誘電体セラミックの結晶粒径が30nm以上150nm以下であることを特徴とする誘電体セラミック。 - TiおよびZrの合計含有量を100モル部としたときの、(Ba、Ca、SrおよびBiの合計含有量−TiおよびZrの合計含有量)が12モル部以下であることを特徴とする、請求項3に記載の誘電体セラミック。
- BaおよびTiを含むペロブスカイト型化合物(ただし、Baの一部はCaで置換されていても良く、Tiの一部はZrで置換されていても良い)を主成分とする主成分粉末を用意する工程と、
MおよびQの少なくとも一方の化合物(MはCu、Zn、Li、K、及びNaのうちの少なくとも一種、QはBa、CaおよびSrのうちの少なくとも一種)およびBi化合物を用意する工程と、
前記主成分粉末、前記MおよびQの少なくとも一方の化合物、Bi化合物を混合し、その後、セラミックスラリーを得る工程と、
前記セラミックスラリーからセラミックグリーンシートを得る工程と、
前記セラミックグリーンシートと、内部電極層と、を積み重ねて焼成前の積層体を得る工程と、
前記焼成前の積層体を焼成して、誘電体セラミック層間に内部電極が形成された積層体を得る工程と、を備える積層セラミックコンデンサの製造方法であって、
TiおよびZrの合計含有量を100モル部としたときの、MとQとBiの合計含有量が3モル部以上であり、
前記誘電体セラミック層の結晶粒径が30nm以上150nm以下であること、
を特徴とする積層セラミックコンデンサの製造方法。 - TiおよびZrの合計含有量を100モル部としたときの、MとQとBiの合計含有量が12モル部以下であること、を特徴とする、請求項5に記載の積層セラミックコンデンサの製造方法。
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