JP6795302B2 - セラミック電子部品 - Google Patents
セラミック電子部品 Download PDFInfo
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- JP6795302B2 JP6795302B2 JP2015257400A JP2015257400A JP6795302B2 JP 6795302 B2 JP6795302 B2 JP 6795302B2 JP 2015257400 A JP2015257400 A JP 2015257400A JP 2015257400 A JP2015257400 A JP 2015257400A JP 6795302 B2 JP6795302 B2 JP 6795302B2
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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 37
- 229910002113 barium titanate Inorganic materials 0.000 claims description 37
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 13
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Description
誘電体層および電極層を有するセラミック電子部品であって、
前記誘電体層は、チタン酸バリウムおよびイットリウムを含み、
前記誘電体層は、誘電体粒子およびY−Ti偏析粒子を含み、
前記誘電体層の断面において前記Y−Ti偏析粒子が占める面積割合が1.3%以下であることを特徴とする。
前記チタン酸バリウムの含有量をBaTiO3換算で100モル部とした場合に、前記イットリウムの含有量がY2O3換算で1.0〜1.5モル部、前記マグネシウムの含有量がMgO換算で1.8〜2.5モル部、前記クロムの含有量がCr2O3換算で0.2〜0.7モル部、前記バナジウムの含有量がV2O5換算で0.05〜0.2モル部、前記カルシウムの含有量がCaO換算で0.5〜2.0モル部、前記ケイ素の含有量がSiO2換算で1.65〜3.0モル部であることが好ましい。
図1に示すように、本発明の一実施形態に係る積層セラミックコンデンサ1は、誘電体層2と、内部電極層3と、が交互に積層された構成のコンデンサ素子本体10を有する。内部電極層3は、各端面がコンデンサ素子本体10の対向する2端部の表面に交互に露出するように積層してある。一対の外部電極4は、コンデンサ素子本体10の両端部に形成され、交互に配置された内部電極層3の露出端面に接続されて、コンデンサ回路を構成する。
誘電体層2は、チタン酸バリウム、イットリウム、マグネシウム、クロム、バナジウム、カルシウムおよびケイ素を含有する誘電体磁器組成物から構成されている。少なくともチタン酸バリウムおよびイットリウムを含有することは必須である。
本実施形態では、誘電体層2には、誘電体粒子と、YおよびTiがそれぞれ後述する特定濃度以上含まれるY−Ti偏析粒子と、が存在している。誘電体粒子は、主にチタン酸バリウムからなる。Y−Ti偏析粒子が占める領域(以下、Y−Ti偏析領域と記載する場合がある)が誘電体層2の断面に対して面積比で1.3%以下、存在することで、コンデンサの高温負荷寿命を向上させることができ、その結果、信頼性を高めることができる。また、本実施形態では、Y−Ti偏析領域が存在していればよく、Y−Ti偏析領域の面積比に下限は存在しないが、通常は0.1%以上である。
内部電極層3に含有される導電材は特に限定されないが、誘電体層2の構成材料が耐還元性を有するため、比較的安価な卑金属を用いることができる。導電材として用いる卑金属としては、NiまたはNi合金が好ましい。Ni合金としては、Mn,Cr,CoおよびAlから選択される1種以上の元素とNiとの合金が好ましく、合金中のNi含有量は95重量%以上であることが好ましい。なお、NiまたはNi合金中には、P等の各種微量成分が0.1重量%程度以下含まれていてもよい。内部電極層3の厚さは用途等に応じて適宜決定すればよいが、1〜1.2μm程度であることが好ましい。
外部電極4に含有される導電材は特に限定されないが、本発明では安価なNi,Cuや、これらの合金を用いることができる。外部電極4の厚さは用途等に応じて適宜決定すればよいが、通常、10〜50μm程度であることが好ましい。
本実施形態の積層セラミックコンデンサ1は、従来の積層セラミックコンデンサと同様に、ペーストを用いた通常の印刷法やシート法によりグリーンチップを作製し、これを焼成した後、外部電極を印刷または転写して焼成することにより製造される。以下、製造方法について具体的に説明する。
まず、チタン酸バリウム粉末、および、イットリウムの原料としてY2O3粉末を、それぞれ準備した。チタン酸バリウム粉末としては、組成式Bam TiO2+m で表され、mが0.995≦m≦1.010であり、BaとTiとのモル比が0.995≦Ba/Ti≦1.010であるチタン酸バリウムを用いた。以下、チタン酸バリウムの組成式を単にBaTiO3と記載する。また、マグネシウムの原料としてMgCO3粉末 、クロムの原料としてCr2O3粉末、バナジウムの原料としてV2O5粉末を準備した。さらに、バリウム化合物の原料としてBaO粉末、カルシウムの原料としてCaO粉末、ケイ素の原料としてSiO2粉末を準備した。
焼成後の誘電体粒子のd50は、チップ側面を鏡面研磨したサンプルをFE−SEMにて観察し、30000倍に拡大した画像を得て、その画像から得られた粒子の円相当径により測定した。なお、サンプル粒子数は500〜2000個となる。
コンデンサ試料の誘電体層の切断面についてSTEM観察を行い、視野3.0×3.0μmの範囲について、STEMに付属のエネルギー分散型X線分光装置(STEM−EDX)を用いて、Y元素の元素マッピングを行い、Y元素の元素マッピング画像を作成した。元素マッピング画像はそれぞれ異なる観察箇所で5枚作成した。
本実施例においては、コンデンサ試料に対し、200℃にて、25V/μmの電界下で直流電圧の印加状態に保持し、印加開始から絶縁抵抗が一桁落ちるまでの時間を高温負荷寿命HALT−ηと定義した。また、本実施例では、上記の評価を10個のコンデンサ試料について行い、その平均値を高温負荷寿命HALT−ηとした。評価基準は10時間以上を良好とした。結果を表1に示す。
コンデンサ試料に対し、LCRメータを用いて、温度20℃、周波数1kHzで比誘電率εsを測定した。結果を表1に示す。なお、本実施例では、εs≧1900を良好とした。
コンデンサ試料に対し、恒温槽とLCRメータを用いて、温度25℃および125℃で静電容量を測定した。そして、温度25℃での静電容量を基準とした場合における温度125℃での静電容量の変化割合を求め、静電容量温度特性TC@125℃とした。結果を表1に示す。なお、本実施例では、−15.0%≦TC@125℃≦15.0%である場合を良好とした。また、−15.0%≦TC@125℃≦15.0%であるコンデンサ試料は、全てX7R特性を満足することを確認した。
まず、高温負荷寿命HALT−ηが10時間未満である試料は本発明の課題を解決していない。この場合には、比誘電率および静電容量温度特性の結果に関わらず×とした。次に、高温負荷寿命が10時間以上である場合において、比誘電率および静電容量温度特性の両方が良好である場合を◎、比誘電率および静電容量温度特性のいずれか一方が良好である場合を○、比誘電率および静電容量温度特性がいずれも良好ではない場合を△とした(ただし、実施例1および後述する実施例2では△と評価される試料は無かった)。なお、◎、○、△、×の順で評価が高い。
材料粒径のd50を0.25μm〜0.50μmまでの範囲内で変化させた点以外は実施例1の試料番号3と同様にして試料番号31〜35の積層セラミックコンデンサの試料を作製した。そして、実施例1と同様の特性評価を行った。結果を表2に示す。
2… 誘電体層
3… 内部電極層
4… 外部電極
10… コンデンサ素子本体
Claims (7)
- 誘電体層および電極層を有するセラミック電子部品であって、
前記誘電体層は、チタン酸バリウムおよびイットリウムを含み、
前記誘電体層は、誘電体粒子およびY−Ti偏析粒子を含み、
前記誘電体層の断面において前記Y−Ti偏析粒子が占める面積割合が1.3%以下であり、
前記Y−Ti偏析粒子が占める領域であるY−Ti偏析領域では、Y元素の濃度がY元素の平均濃度の2倍以上であり、
Ti元素の濃度がTi元素の平均濃度の0.7〜1.1倍であり、
Ba元素の濃度がBa元素の平均濃度の0.5倍以下であり、
前記誘電体層は、クロムを含み、
前記チタン酸バリウムの含有量をBaTiO3換算で100モル部とした場合に、前記クロムの含有量がCr2O3換算で0.2〜0.7モル部であることを特徴とするセラミック電子部品。 - 前記誘電体層は、マグネシウム、バナジウム、カルシウムおよびケイ素を含み、
前記チタン酸バリウムの含有量をBaTiO3換算で100モル部とした場合に、前記イットリウムの含有量がY2O3換算で1.0〜1.5モル部、前記マグネシウムの含有量がMgO換算で1.8〜2.5モル部、前記バナジウムの含有量がV2O5換算で0.05〜0.2モル部、前記カルシウムの含有量がCaO換算で0.5〜2.0モル部、前記ケイ素の含有量がSiO2換算で1.65〜3.0モル部であることを特徴とする請求項1記載のセラミック電子部品。 - 誘電体層および電極層を有するセラミック電子部品であって、
前記誘電体層は、チタン酸バリウムおよびイットリウムを含み、
前記誘電体層は、誘電体粒子およびY−Ti偏析粒子を含み、
前記誘電体層の断面において前記Y−Ti偏析粒子が占める面積割合が1.3%以下であり、
前記Y−Ti偏析粒子が占める領域であるY−Ti偏析領域では、Y元素の濃度がY元素の平均濃度の2倍以上であり、
Ti元素の濃度がTi元素の平均濃度の0.7〜1.1倍であり、
Ba元素の濃度がBa元素の平均濃度の0.5倍以下であり、
前記誘電体層は、バナジウムを含み、
前記チタン酸バリウムの含有量をBaTiO3換算で100モル部とした場合に、前記バナジウムの含有量がV2O5換算で0.05〜0.2モル部であることを特徴とするセラミック電子部品。 - 誘電体層および電極層を有するセラミック電子部品であって、
前記誘電体層は、チタン酸バリウムおよびイットリウムを含み、
前記誘電体層は、誘電体粒子およびY−Ti偏析粒子を含み、
前記誘電体層の断面において前記Y−Ti偏析粒子が占める面積割合が1.3%以下であり、
前記Y−Ti偏析粒子が占める領域であるY−Ti偏析領域では、Y元素の濃度がY元素の平均濃度の2倍以上であり、
Ti元素の濃度がTi元素の平均濃度の0.7〜1.1倍であり、
Ba元素の濃度がBa元素の平均濃度の0.5倍以下であり、
前記誘電体層は、カルシウムを含み、
前記チタン酸バリウムの含有量をBaTiO3換算で100モル部とした場合に、前記カルシウムの含有量がCaO換算で0.5〜2.0モル部であることを特徴とするセラミック電子部品。 - 誘電体層および電極層を有するセラミック電子部品であって、
前記誘電体層は、チタン酸バリウムおよびイットリウムを含み、
前記誘電体層は、誘電体粒子およびY−Ti偏析粒子を含み、
前記誘電体層の断面において前記Y−Ti偏析粒子が占める面積割合が1.3%以下であり、
前記Y−Ti偏析粒子が占める領域であるY−Ti偏析領域では、Y元素の濃度がY元素の平均濃度の2倍以上であり、
Ti元素の濃度がTi元素の平均濃度の0.7〜1.1倍であり、
Ba元素の濃度がBa元素の平均濃度の0.5倍以下であり、
前記誘電体層は、ケイ素を含み、
前記チタン酸バリウムの含有量をBaTiO3換算で100モル部とした場合に、前記ケイ素の含有量がSiO2換算で1.65〜3.0モル部であることを特徴とするセラミック電子部品。 - 前記誘電体粒子のd50は、0.47μm以下である請求項1〜5のいずれかに記載のセラミック電子部品。
- 前記誘電体層においてY2O3換算した前記イットリウムの含有量を、SiO2換算した前記ケイ素の含有量で割った値が0.79以下である請求項2または5に記載のセラミック電子部品。
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