JP4666269B2 - バリスタ機能付き積層型半導体セラミックコンデンサ及びその製造方法 - Google Patents
バリスタ機能付き積層型半導体セラミックコンデンサ及びその製造方法 Download PDFInfo
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- JP4666269B2 JP4666269B2 JP2007556448A JP2007556448A JP4666269B2 JP 4666269 B2 JP4666269 B2 JP 4666269B2 JP 2007556448 A JP2007556448 A JP 2007556448A JP 2007556448 A JP2007556448 A JP 2007556448A JP 4666269 B2 JP4666269 B2 JP 4666269B2
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- 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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- 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
- C04B2235/786—Micrometer sized grains, i.e. from 1 to 100 micron
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- 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
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- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/43—Electric condenser making
- Y10T29/435—Solid dielectric type
Description
したがって、結晶粒子の平均粒径dを1.0μm以下に小さくしても、粒界層の平均厚さtを薄くすることにより、見掛け比誘電率εrAPPを大きくすることが可能となる。
1a〜1g 半導体セラミック層
2、2a〜2f 内部電極
3a、3b 外部電極
Claims (10)
- SrTiO3系粒界絶縁型の半導体セラミックで形成された複数の半導体セラミック層と複数の内部電極層とが交互に積層されて焼成されてなる積層焼結体と、該積層焼結体の両端部に前記内部電極層と電気的に接続された外部電極とを有するバリスタ機能付き積層型半導体セラミックコンデンサであって、
前記半導体セラミックが、SrサイトとTiサイトとの配合モル比mは1.000<m≦1.020であり、ドナー元素が結晶粒子中に固溶されると共に、アクセプタ元素が、前記Ti元素100モルに対し0.5モル以下(ただし、0モルを含まず。)の範囲で粒界層中に存在し、かつ、結晶粒子の平均粒径が1.0μm以下であることを特徴とするバリスタ機能付き積層型半導体セラミックコンデンサ。 - 前記アクセプタ元素が、前記Ti元素100モルに対し、0.3〜0.5モルの範囲で含有されていることを特徴とする請求項1記載のバリスタ機能付き積層型半導体セラミックコンデンサ。
- 前記アクセプタ元素は、Mn、Co、Ni、及びCrのうちの少なくとも1種の元素であることを特徴とする請求項1又は請求項2記載のバリスタ機能付き積層型半導体セラミックコンデンサ。
- 前記ドナー元素は、La、Sm、Dy、Ho、Y、Nd、Ce、Nb、Ta、及びWの中から選択された少なくとも1種の元素であることを特徴とする請求項1乃至請求項3のいずれかに記載のバリスタ機能付き積層型半導体セラミックコンデンサ。
- 前記結晶粒子の平均粒径が0.5〜0.8μmであることを特徴とする請求項1乃至請求項4のいずれかに記載のバリスタ機能付き積層型半導体セラミックコンデンサ。
- 低融点酸化物が、前記Ti元素100モルに対し0.1モル以下の範囲で含有されていることを特徴とする請求項1乃至請求項5のいずれかに記載のバリスタ機能付き積層型半導体セラミックコンデンサ。
- 前記低融点酸化物が、SiO2であることを特徴とする請求項6記載のバリスタ機能付き積層型半導体セラミックコンデンサ。
- SrTiO3系粒界絶縁型の半導体セラミックを用いたバリスタ機能付き積層型半導体セラミックコンデンサの製造方法であって、
ドナー化合物を含むセラミック素原料を、SrサイトとTiサイトの配合モル比mが1.000<m≦1.020の範囲となるように秤量して混合粉砕した後、仮焼処理を行って仮焼粉末を作製する仮焼粉末作製工程と、
Ti元素100モルに対し0.5モル以下(ただし、0モルを含まず。)となるようにアクセプタ化合物を秤量し、該アクセプタ化合物を前記仮焼粉末と混合し、熱処理を行って熱処理粉末を作製する熱処理粉末作製工程と、
前記熱処理粉末に成形加工を施しセラミックグリーンシートを作製し、その後内部電極層とセラミックグリーンシートを交互に積層して積層体を形成する積層体形成工程と、
還元雰囲気下、前記積層体に一次焼成処理を行った後、弱還元雰囲気下、大気雰囲気下、又は酸化雰囲気下で二次焼成処理を行う焼成工程とを含むことを特徴とするバリスタ機能付き積層型半導体セラミックコンデンサの製造方法。 - 前記仮焼粉末作製工程は、結晶粒子の平均粒径が1.0μm以下となるように仮焼処理を行うことを特徴とする請求項8記載のバリスタ機能付き積層型半導体セラミックコンデンサの製造方法。
- 前記仮焼処理における仮焼温度が、前記一次焼成処理における焼成温度よりも高いことを特徴とする請求項8又は請求項9記載のバリスタ機能付き積層型半導体セラミックコンデンサの製造方法。
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