JPWO2006104026A1 - 誘電体磁器組成物、およびこれを用いたコンデンサの製造方法 - Google Patents
誘電体磁器組成物、およびこれを用いたコンデンサの製造方法 Download PDFInfo
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Abstract
Description
12 誘電体層
13,14 内部電極
15 焼結体
16,17 焼結体の端面
18,19 外部電極
20 保護層
21 ニッケルメッキ層
22 半田メッキ層
以下、本発明の誘電体磁器組成物の実施の形態1について、図1を用いて積層セラミックコンデンサを例にとって説明する。
各出発原料をBaTiO3を100モルに対し、表3に示す組成となるように、BaCO3,Er2O3,Dy2O3,Ho2O3,MgO,MnO4/3,SiO2,V2O5,Al2O3をそれぞれ秤量して実施の形態1と同様に、図1に示す断面構造を有する積層セラミックコンデンサ11を作製する。ここで主材料のBaTiO3には、Ba/Tiモル比が1.001、比表面積が4.3m2/gで、X線回折チャートにおけるX線回折角2θが40〜50°の範囲において(002)面と(200)面のピークの二つに分かれているものを用いた。次いで、作製された積層セラミックコンデンサ11について、20℃の温度で、周波数1kHzにおける誘電率、誘電正接(tanδ)を測定する。
各出発原料をBaTiO3を100モルに対し、表5に示す組成となるように、BaCO3,Er2O3,Dy2O3,Ho2O3,MgO,MnO4/3,SiO2,V2O5,Al2O3をそれぞれ秤量し実施の形態1と同様に、図1に示す断面構造を有する積層セラミックコンデンサ11を作製する。ここでBaTiO3は、Ba/Tiモル比が1.001、比表面積4.3m2/gで、X線回折チャートにおけるX線回折角2θが40〜50°の範囲において(002)面と(200)面のピークの二つに分かれているものを用いる。次いで、得られた積層セラミックコンデンサ11を、20℃の温度で、周波数1kHzにおける誘電率、誘電正接(tanδ)を測定する。
BaTiO3を100モルに対し、BaCO3を0.4モル、MgOを2モル、Er2O3を0.3モル、Dy2O3を0.3モル、Ho2O3を0.4モル、MnをMnO4/3の形で0.2モル、SiO2を0.6モル、V2O5を0.15モル、Al2O3を0.25モル添加した組成を基本とする。そして、MnO4/3,SiO2,V2O5,Al2O3の各副成分については、それぞれ表7から表10に示す添加量を基本組成に添加した誘電体磁器組成物を用いて、実施の形態1から3と同様に、図1に示す断面構造を有する積層チップコンデンサ11を試作する。ここでBaTiO3は、同様に、Ba/Tiモル比が1.001、BET法で求めた比表面積が4.3m2/gで、X線回折チャートにおけるX線回折角2θが40〜50°の範囲において(002)面と(200)面のピークの二つに分かれているものを用いた。次いで、得られた積層セラミックコンデンサ11を、20℃の温度で、周波数1kHzにおける誘電率、誘電正接(tanδ)を測定する。
以下、本発明の誘電体磁器組成物の実施の形態1について、図1を用いて積層セラミックコンデンサを例にとって説明する。
各出発原料をBaTiO3を100モルに対し、表3に示す組成となるように、BaCO3,Er2O3,Dy2O3,Ho2O3,MgO,MnO4/3,SiO2,V2O5,Al2O3をそれぞれ秤量して実施の形態1と同様に、図1に示す断面構造を有する積層セラミックコンデンサ11を作製する。ここで主材料のBaTiO3には、Ba/Tiモル比が1.001、比表面積が4.3m2/gで、X線回折チャートにおけるX線回折角2θが40〜50°の範囲において(002)面と(200)面のピークの二つに分かれているものを用いた。次いで、作製された積層セラミックコンデンサ11について、20℃の温度で、周波数1kHzにおける誘電率、誘電正接(tanδ)を測定する。
各出発原料をBaTiO3を100モルに対し、表5に示す組成となるように、BaCO3,Er2O3,Dy2O3,Ho2O3,MgO,MnO4/3,SiO2,V2O5,Al2O3をそれぞれ秤量し実施の形態1と同様に、図1に示す断面構造を有する積層セラミックコンデンサ11を作製する。ここでBaTiO3は、Ba/Tiモル比が1.001、比表面積4.3m2/gで、X線回折チャートにおけるX線回折角2θが40〜50°の範囲において(002)面と(200)面のピークの二つに分かれているものを用いる。次いで、得られた積層セラミックコンデンサ11を、20℃の温度で、周波数1kHzにおける誘電率、誘電正接(tanδ)を測定する。
BaTiO3を100モルに対し、BaCO3を0.4モル、MgOを2モル、Er2O3を0.3モル、Dy2O3を0.3モル、Ho2O3を0.4モル、MnをMnO4/3の形で0.2モル、SiO2を0.6モル、V2O5を0.15モル、Al2O3を0.25モル添加した組成を基本とする。そして、MnO4/3,SiO2,V2O5,Al2O3の各副成分については、それぞれ表7から表10に示す添加量を基本組成に添加した誘電体磁器組成物を用いて、実施の形態1から3と同様に、図1に示す断面構造を有する積層チップコンデンサ11を試作する。ここでBaTiO3は、同様に、Ba/Tiモル比が1.001、BET法で求めた比表面積が4.3m2/gで、X線回折チャートにおけるX線回折角2θが40〜50°の範囲において(002)面と(200)面のピークの二つに分かれているものを用いた。次いで、得られた積層セラミックコンデンサ11を、20℃の温度で、周波数1kHzにおける誘電率、誘電正接(tanδ)を測定する。
12 誘電体層
13,14 内部電極
15 焼結体
16,17 焼結体の端面
18,19 外部電極
20 保護層
21 ニッケルメッキ層
22 半田メッキ層
Claims (11)
- 主成分としてBa/Tiのモル比を0.997〜1.007に調整したチタン酸バリウムを100モルに対し、副成分として少なくともMgの化合物をMgOに換算して0.15〜2.5モル、Baの化合物をBaCO3に換算して0〜1.6モル、LnはErを必須としてEr,Dy,Hoのうちから選ばれた2種または3種の元素を含むものであるとしたとき、Lnの化合物をLn2O3に換算して0.1〜3.0モル、Mnの化合物をMnO4/3に換算して0.01〜0.4モル、Vの化合物をV2O5に換算して0.01〜0.26モル、Siの化合物をSiO2に換算して0.3〜3.5モル、Alの化合物をAl2O3に換算して0.01〜2.5モル含むことを特徴とする誘電体磁器組成物。
- x+y+z=1として前記Lnの化合物を一般式xEr2O3+yDy2O3+zHo2O3と表したとき、前記Lnの化合物の組成はx、y、zをモル比率で示す三元成分図において、x,y,zが下記のA,B,D,Eを頂点とする四角形の領域内にあることを特徴とする請求項1記載の誘電体磁器組成物、
A:(x,y,z)=(0.05,0,0.95)
B:(x,y,z)=(0.5,0,0.5)
D:(x,y,z)=(0.5,0.5,0)
E:(x,y,z)=(0.05,0.95,0)。 - u+v+w=1として副成分のうち前記BaCO3と前記MgOと前記Ln2O3の組成比をuBaCO3+vMgO+wLn2O3と表したとき、u,v,wをモル比率で示す三元成分図において、下記のE,F,G,H,J,K,Lを頂点とする六角形の領域内にあることを特徴とする請求項1記載の誘電体磁器組成物、
F:(u,v,w)=(0.15,0.15,0.7)
G:(u,v,w)=(0.7,0.15,0.15)
H:(u,v,w)=(0.7,0.24,0.06)
J:(u,v,w)=(0.18,0.75,0.07)
K:(u,v,w)=(0,0.75,0.25)
L:(u,v,w)=(0,0.3,0.7)。 - 主成分としてBa/Tiのモル比が0.997〜1.007であるチタン酸バリウムを100モルに対し、副成分として少なくともMgの化合物をMgOに換算して0.15〜2.5モル、Baの化合物をBaCO3に換算して0.0〜1.6モル、LnはErを必須としてEr,Dy,Hoのうちから選ばれた2種または3種の元素を含むものであるとしたとき、Lnの化合物をLn2O3に換算して0.1〜3.0モル、Mnの化合物をMnO4/3に換算して0.01〜0.4モル、Vの化合物をV2O5に換算して0.01〜0.26モル、Siの化合物をSiO2に換算して0.3〜3.5モル、Alの化合物をAl2O3に換算して0.01〜2.5モル含有するセラミック粉体を混合する混合工程と、混合後の前記セラミック粉体を用いてセラミックスラリーを作製するスラリー作製工程と、前記セラミックスラリーからセラミックシートを作製するセラミックシート成形工程と、前記セラミックシートと卑金属を主成分とする内部電極とを交互に積層して積層体を作製する積層工程と、前記積層体を焼成して内部電極と誘電体層とからなる焼結体を得る焼成工程と、前記焼結体の前記内部電極が露出した端面に一対の外部電極を形成する外部電極形成工程とを含むことを特徴とするコンデンサの製造方法。
- 前記セラミック粉体を混合する前記混合工程は、媒体攪拌ミルを用いることを特徴とする請求項4に記載のコンデンサの製造方法。
- 前記セラミックスラリーを作製する前記スラリー作製工程は、前記セラミックスラリーの混合に媒体攪拌ミルを用いることを特徴とする請求項4に記載のコンデンサの製造方法。
- 前記主成分であるチタン酸バリウムは、BET法で測定した比表面積が3〜8m2/gであるものを用いることを特徴とする請求項4に記載のコンデンサの製造方法。
- 前記主成分であるチタン酸バリウムは、X線回折チャートにおけるX線回折角2θが40〜50°の範囲において、(200)面の回折ピークと(002)面の回折ピークの2つの回折ピークが分離したものを用いることを特徴とする請求項4に記載のコンデンサの製造方法。
- 前記Mgの化合物としてMg(OH)2を用いることを特徴とする請求項4に記載のコンデンサの製造方法。
- 前記Alの化合物を除くセラミック粉体を混合する前記混合工程と、混合後に、前記セラミック粉体を仮焼する工程と、仮焼後の前記セラミック粉体に前記Alの化合物を添加する工程と、添加後の前記セラミック粉体を用いてセラミックスラリーを作製する前記スラリー作製工程とを含むことを特徴とする請求項4記載のコンデンサの製造方法。
- 前記外部電極形成工程の前に、前記焼結体中の前記誘電体層を再酸化する工程を設けることを特徴とする請求項4に記載のコンデンサの製造方法。
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