JP2006282482A - 電子部品、誘電体磁器組成物およびその製造方法 - Google Patents
電子部品、誘電体磁器組成物およびその製造方法 Download PDFInfo
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- JP2006282482A JP2006282482A JP2005107855A JP2005107855A JP2006282482A JP 2006282482 A JP2006282482 A JP 2006282482A JP 2005107855 A JP2005107855 A JP 2005107855A JP 2005107855 A JP2005107855 A JP 2005107855A JP 2006282482 A JP2006282482 A JP 2006282482A
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Abstract
【解決手段】 チタン酸バリウムを含む主成分と、MgO,CaO,BaOおよびSrOから選択される少なくも1種を含む第1副成分と、Al2 O3 ,Li2 OおよびB2 O3 から選択される少なくとも1種を含む第2副成分と、V2 O5 ,MoO3 およびWO3 から選択される少なくとも1種を含む第3副成分と、R1の酸化物(ただし、R1はSc,Er,Tm,YbおよびLuから選択される少なくとも1種)を含む第4副成分と、CaZrO3 またはCaO+ZrO2 を含む第5副成分と、を少なくとも有する誘電体磁器組成物。
【選択図】 無し
Description
チタン酸バリウムを含む主成分と、
MgO,CaO,BaOおよびSrOから選択される少なくも1種を含む第1副成分と、
Al2 O3 ,Li2 OおよびB2 O3 から選択される少なくとも1種を含む第2副成分と、
V2 O5 ,MoO3 およびWO3 から選択される少なくとも1種を含む第3副成分と、
R1の酸化物(ただし、R1はSc,Er,Tm,YbおよびLuから選択される少なくとも1種)を含む第4副成分と、
CaZrO3 またはCaO+ZrO2 を含む第5副成分と、を少なくとも有する誘電体磁器組成物であって、
前記主成分100モルに対する各副成分の比率が、
第1副成分:0.1〜3モル、
第2副成分:1〜10モル(ただし、第2副成分のモル数は、Al,LiまたはB元素換算での比率である)、
第3副成分:0.01〜0.5モル、
第4副成分:0.5〜7モル(ただし、第4副成分のモル数は、R1単独での比率である)、
第5副成分:0<第5副成分≦5モル、
である。
前記第6副成分の含有量が、前記主成分100モルに対して、9モル以下(ただし、第6副成分のモル数は、R2単独での比率である)である。
上記いずれかに記載の誘電体磁器組成物を製造する方法であって、
焼成後に前記誘電体磁器組成物となる誘電体原料を焼成し、その後、1000〜1400℃でアニール処理をすることを特徴とする。
また、本発明の製造方法においては、上記アニール処理をする際の酸素分圧は、10−11MPa以上、特に、10−7〜10−6MPaとすることが好ましい。アニール処理を前記所定条件で行うことにより、高温加速寿命を改善することができる。
図1は本発明の一実施形態に係る積層セラミックコンデンサの断面図である。
図1に示すように、本発明の一実施形態に係る電子部品としての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コンデンサ素子本体10を有する。コンデンサ素子本体10の両端部には、素子本体10の内部で交互に配置された内部電極層3と各々導通する一対の外部電極4が形成してある。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、本発明の誘電体磁器組成物を含有する。
本発明の誘電体磁器組成物は、
主成分であるチタン酸バリウムと、
MgO,CaO,BaOおよびSrOから選択される少なくとも1種を含む第1副成分と、
Al2 O3 ,Li2 OおよびB2 O3 から選択される少なくとも1種を含む第2副成分と、
V2 O5 ,MoO3 およびWO3 から選択される少なくとも1種を含む第3副成分と、
R1の酸化物(ただし、R1はSc,Er,Tm,YbおよびLuから選択される少なくとも1種)を含む第4副成分と、
CaZrO3 またはCaO+ZrO2 を含む第5副成分と、を少なくとも有する誘電体磁器組成物で構成してある。
第1副成分:0.1〜3モル、
第2副成分:1〜10モル、
第3副成分:0.01〜0.5モル、
第4副成分:0.5〜7モル、
第5副成分:0<第5副成分≦5モルであり、
好ましくは、
第1副成分:0.5〜2.5モル、
第2副成分:2〜5モル、
第3副成分:0.1〜0.4モル、
第4副成分:0.5〜5.0モル、
第5副成分:0.5〜3モルである。
第1副成分(MgO,CaO,BaOおよびSrO)の含有量が少なすぎると、容量温度変化率が大きくなってしまう。一方、含有量が多すぎると、焼結性が悪化する。なお、第1副成分中における各酸化物の構成比率は任意である。
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、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。
内部電極層の厚さは用途等に応じて適宜決定すればよいが、通常、0.5〜5μm、特に0.5〜2.5μm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、本実施形態では安価な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。
本発明の誘電体磁器組成物を用いた積層セラミックコンデンサは、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。
外部電極用ペーストは、上記した内部電極層用ペーストと同様にして調製すればよい。
このようにして製造された本発明の積層セラミックコンデンサは、ハンダ付等によりプリント基板上などに実装され、各種電子機器等に使用される。
まず、誘電体原料(誘電体磁器組成物粉末)を作製するために、主成分原料(BaTiO3 )および以下の第1〜第7副成分原料を準備した。
Al2 O3 (第2副成分):0.9〜10.1モル、
V2 O5 (第3副成分):0.1モル、
Yb2 O3 (第4副成分):2.19モル、
CaZrO3 (第5副成分):1.2モル、
Y2 O3 (第6副成分):2.4モル、
MnCO3 (第7副成分):0.15モル、
上記第1、第3、第5、第7副成分の添加量は、主成分100モルに対するモル数を、各酸化物換算または各複合酸化物換算で表した添加量であり、上記第2、第4、第6副成分の添加量は、それぞれ、Al元素換算、Yb元素換算およびY元素換算での添加量である。また、第2副成分は、表1に示す各添加量とした。
脱バインダ処理条件は、昇温速度:30℃/時間、保持温度:260℃、温度保持時間:8時間、雰囲気:空気中とした。
焼成条件は、昇温速度:200℃/時間、保持温度:1250〜1350℃、温度保持時間:2時間、冷却速度:300℃/時間、雰囲気ガス:加湿したN2 +H2 混合ガス(酸素分圧:10−2Pa)とした。
アニール条件は、昇温速度:200℃/時間、保持温度:1200℃、温度保持時間:2時間、冷却速度:300℃/時間、雰囲気ガス:加湿したN2 ガス(酸素分圧:10−7MPa)とした。
なお、焼成およびアニールの際の雰囲気ガスの加湿には、水温を5〜75℃としたウエッターを用いた。
容量温度特性は、得られたコンデンサ試料に対し、−55℃〜150℃の温度範囲で静電容量を測定することにより評価した。具体的には、静電容量を、デジタルLCRメータ(YHP製4274A)を用い、周波数1kHz、入力信号レベル1Vrmsの条件下で測定した。そして、これらの温度範囲で最も容量温度特性が悪くなる150℃の温度環境下での静電容量の変化率(ΔC/C、単位は%)を算出した。本実施例においては、−55〜150℃において、ΔC/C=±15%以内、すなわち、X8R特性を満足する試料を良好とした。結果を表1に示す。
容量不良率は、まず、100個のコンデンサ試料に対し、基準温度25℃において、デジタルLCRメータにて、周波数1kHz、入力信号レベル1.0Vrmsの条件下で静電容量を測定した。そして、100個の試料の測定結果を平均することにより、平均容量を求めた。次いで、この平均容量を100%とした場合に、静電容量が80%未満となった試料の割合を求め、これを容量不良率とした。本実施例においては、容量不良率が20%以下(すなわち、100個の試料のうち、静電容量が80%未満となった試料が20個以下)となった試料を良好とした。結果を表1に示す。
コンデンサの試料を、200℃で10V/μmの直流電圧の印加状態に保持することにより、高温加速寿命を測定した。この高温加速寿命は、10個のコンデンサ試料について行い、平均寿命時間を測定することにより評価した。本実施例においては、印加開始から絶縁抵抗が一桁落ちるまでの時間を寿命と定義した。寿命時間は長いほど好ましい。結果を表1に示す。
比誘電率εは、コンデンサ試料に対し、基準温度25℃において、デジタルLCRメータにて、周波数1kHz、入力信号レベル1.0Vrmsの条件下で測定された静電容量から算出した(単位なし)。本実施例においては、いずれの試料も比誘電率は、1000以上となり良好な結果であった。
表1より、焼結助剤であるAl2 O3 の添加量を1〜10モルとした試料2〜6は、いずれも容量温度特性がX8R特性を満足し、また、容量不良率が5%以下となり良好な結果となった。また、これらの試料2〜6は、1200℃という比較的高い温度でアニール処理を行ったため、200℃、10V/μmという比較的厳しい条件においても、高温加速寿命が、いずれも10時間以上(アニール温度を1000℃とした場合の約2倍の寿命時間)となり、良好な結果であった。なかでも、Al2 O3 の添加量をそれぞれ3モル、5モルとした試料4,5は、容量不良率が0%となり、また、高温加速寿命も長く、特に良好な結果となった。
第2副成分として、Al2 O3 の代わりに、Li2 Oを使用した以外は、実施例1と同様にして、コンデンサの試料11〜17を得た。得られたコンデンサ試料について、実施例1と同様にして、各種特性を評価した。結果を表2に示す。なお、実施例の試料12〜16は、いずれも比誘電率が1000以上となり、良好な結果であった。
第2副成分として、Al2 O3 の代わりに、B2 O3 を使用した以外は、実施例1と同様にして、コンデンサの試料21〜27を得た。得られたコンデンサ試料について、実施例1と同様にして、各種特性を評価した。結果を表3に示す。なお、実施例の試料22〜26は、いずれも比誘電率が1000以上となり、良好な結果であった。
Al2 O3 の代わりに、(Ba0.6 Ca0.4 )SiO3 を使用した以外は、実施例1と同様にして、コンデンサの試料31〜37を得た。得られたコンデンサ試料について、実施例1と同様にして、各種特性を評価した。結果を表4に示す。
(Ba0.6 Ca0.4 )SiO3 の代わりに、SiO2 、BaOおよびCaOを使用した以外は、実施例4と同様にして、コンデンサの試料41〜47を得た。得られたコンデンサ試料について、実施例1と同様にして、各種特性を評価した。結果を表5に示す。なお、実施例5においては、SiO2 、BaOおよびCaOのそれぞれの添加量を、実施例4の各試料と同じ量になるように調整した。
実施例1の試料4,14,24において、さらに、(Ba0.6 Ca0.4 )SiO3 を、BaTiO3 100モルに対して、1モル加えた以外は、実施例1の試料4,14,24と同様にして表6に示す試料51,52,53を得た。得られたコンデンサ試料について、実施例1と同様にして、各種特性を評価した。結果を表6に示す。
10… コンデンサ素子本体
2… 誘電体層
3… 内部電極層
4… 外部電極
Claims (6)
- チタン酸バリウムを含む主成分と、
MgO,CaO,BaOおよびSrOから選択される少なくも1種を含む第1副成分と、
Al2 O3 ,Li2 OおよびB2 O3 から選択される少なくとも1種を含む第2副成分と、
V2 O5 ,MoO3 およびWO3 から選択される少なくとも1種を含む第3副成分と、
R1の酸化物(ただし、R1はSc,Er,Tm,YbおよびLuから選択される少なくとも1種)を含む第4副成分と、
CaZrO3 またはCaO+ZrO2 を含む第5副成分と、を少なくとも有する誘電体磁器組成物であって、
前記主成分100モルに対する各副成分の比率が、
第1副成分:0.1〜3モル、
第2副成分:1〜10モル(ただし、第2副成分のモル数は、Al,LiまたはB元素換算での比率である)、
第3副成分:0.01〜0.5モル、
第4副成分:0.5〜7モル(ただし、第4副成分のモル数は、R1単独での比率である)、
第5副成分:0<第5副成分≦5モル、
である誘電体磁器組成物。 - 第6副成分として、R2の酸化物(ただし、R2はY、Dy、Ho、Tb、GdおよびEuから選択される少なくとも一種)をさらに有し、
前記第6副成分の含有量が、前記主成分100モルに対して、9モル以下(ただし、第6副成分のモル数は、R2単独での比率である)である請求項1に記載の誘電体磁器組成物。 - 第7副成分として、MnOまたはCr2 O3 をさらに有し、前記第7副成分の含有量が、前記主成分100モルに対して、0.5モル以下(ただし、MnまたはCr元素換算での比率である)である請求項1または2に記載の誘電体磁器組成物。
- 請求項1〜3のいずれかに記載の誘電体磁器組成物を製造する方法であって、
焼成後に前記誘電体磁器組成物となる誘電体原料を焼成し、その後、1000〜1400℃でアニール処理をする誘電体磁器組成物の製造方法。 - 請求項1〜3のいずれかに記載の誘電体磁器組成物で構成してある誘電体層を有する電子部品。
- 請求項1〜3のいずれかに記載の誘電体磁器組成物で構成してある誘電体層と、内部電極層と、が交互に積層してあるコンデンサ素子本体を有する積層セラミックコンデンサ。
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