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A platform for research: civil engineering, architecture and urbanism
DIELECTRIC CERAMIC AND MULTILAYER CERAMIC CAPACITOR
To provide a dielectric ceramic capable of providing a capacitor which improves a dielectric constant and reliability and is excellent in capacity and temperature characteristics, and a multilayer ceramic capacitor.SOLUTION: The present invention relates to a dielectric ceramic containing a barium titanate based compound as a main component and further containing a rare earth element. The dielectric ceramic comprises a plurality of crystal particles and an interface existing between the plurality of crystal particles. On a cross section of the dielectric ceramic, the plurality of crystal particles include first crystal particles containing barium, titanium and rare earth element. A first crystal particle 2 includes: a concentration change region including a portion separated at two points where a concentration difference equal to or more than 3% in RE/Ti a molar ratio of a concentration of a rare earth element (RE) with respect to a concentration of titanium (Ti) is generated along a cross section straight line L passing from an interface 10 existing around the first crystal particle through the inside of the first crystal particle; a high concentration region 4 in which the RE/Ti is 5% or more and 20% or less; and a low concentration region 8 in which the RE/Ti is 0% or more and 2% or less.SELECTED DRAWING: Figure 1
【課題】誘電率及び信頼性が高く、且つ容量温度特性に優れたコンデンサを得ることができる誘電体セラミック及び積層セラミックコンデンサを提供する。【解決手段】チタン酸バリウム系化合物を主成分として含み、さらに希土類元素を含む誘電体セラミックであって、誘電体セラミックが、複数の結晶粒子と、複数の結晶粒子間に存在する界面と、を備える。誘電体セラミックの断面において、複数の結晶粒子は、バリウム、チタン及び希土類元素を含む第１の結晶粒子を含む。第１の結晶粒子２は、その周囲に存在する界面１０から第１の結晶粒子の内部を通る断面直線Ｌに沿ってＲＥ／Ｔｉ比（希土類元素（ＲＥ）濃度のチタン（Ｔｉ）濃度に対するモル比）で３％以上の濃度差が生じる２地点で区画される部分を含む濃度変化領域と、ＲＥ／Ｔｉ比が５％以上２０％以下の高濃度領域４と、ＲＥ／Ｔｉ比が０％以上２％以下の低濃度領域８と、を有する。【選択図】図１
DIELECTRIC CERAMIC AND MULTILAYER CERAMIC CAPACITOR
To provide a dielectric ceramic capable of providing a capacitor which improves a dielectric constant and reliability and is excellent in capacity and temperature characteristics, and a multilayer ceramic capacitor.SOLUTION: The present invention relates to a dielectric ceramic containing a barium titanate based compound as a main component and further containing a rare earth element. The dielectric ceramic comprises a plurality of crystal particles and an interface existing between the plurality of crystal particles. On a cross section of the dielectric ceramic, the plurality of crystal particles include first crystal particles containing barium, titanium and rare earth element. A first crystal particle 2 includes: a concentration change region including a portion separated at two points where a concentration difference equal to or more than 3% in RE/Ti a molar ratio of a concentration of a rare earth element (RE) with respect to a concentration of titanium (Ti) is generated along a cross section straight line L passing from an interface 10 existing around the first crystal particle through the inside of the first crystal particle; a high concentration region 4 in which the RE/Ti is 5% or more and 20% or less; and a low concentration region 8 in which the RE/Ti is 0% or more and 2% or less.SELECTED DRAWING: Figure 1
【課題】誘電率及び信頼性が高く、且つ容量温度特性に優れたコンデンサを得ることができる誘電体セラミック及び積層セラミックコンデンサを提供する。【解決手段】チタン酸バリウム系化合物を主成分として含み、さらに希土類元素を含む誘電体セラミックであって、誘電体セラミックが、複数の結晶粒子と、複数の結晶粒子間に存在する界面と、を備える。誘電体セラミックの断面において、複数の結晶粒子は、バリウム、チタン及び希土類元素を含む第１の結晶粒子を含む。第１の結晶粒子２は、その周囲に存在する界面１０から第１の結晶粒子の内部を通る断面直線Ｌに沿ってＲＥ／Ｔｉ比（希土類元素（ＲＥ）濃度のチタン（Ｔｉ）濃度に対するモル比）で３％以上の濃度差が生じる２地点で区画される部分を含む濃度変化領域と、ＲＥ／Ｔｉ比が５％以上２０％以下の高濃度領域４と、ＲＥ／Ｔｉ比が０％以上２％以下の低濃度領域８と、を有する。【選択図】図１
DIELECTRIC CERAMIC AND MULTILAYER CERAMIC CAPACITOR
誘電体セラミック及び積層セラミックコンデンサ
MIZUNO TAKU (author) / ARAKI KEISUKE (author) / WADA HIROYUKI (author)
2022-05-13
Patent
Electronic Resource
Japanese
Dielectric material for multilayer ceramic capacitor, and multilayer ceramic capacitor
| European Patent Office | 2018