Dielectric ceramic composition and electronic device

A dielectric ceramic composition, comprising:

• a main component including barium titanate;
• a fourth subcomponent including an oxide of R1, wherein R1 is at least one kind selected from a first element group composed of rare-earth elements having an effective ionic radius of less than 108 pm when having a coordination number of nine;
• and
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from a second element group composed of rare-earth elements having an effective ionic radius of 108 pm to 113 pm when having a coordination number of nine and at least includes Tb;
• wherein a diffusion part at least including said R1 and R2 exists inside respective dielectric particles composing said dielectric ceramic composition;
• wherein said dielectric particles comprise a ferroelectric part substantially not including said R1 and R2 and a diffusion part existing around the ferroelectric part;
• a grain boundary segregation part exists around the diffusion part;
• said diffusion part and grain boundary segregation part includes at least said R1 and R2;
• and
• when assuming respective existential quantities of R1 and R2 in said diffusion part are MAR1 and MAR2 and respective existential quantities of R1 and R2 in said grain boundary segregation part are MBR1 and MBR2, relationships of (MBR1/MBR2)>1 and (MAR1/MAR2)<(MBR1/MBR2).

A multi-layer ceramic capacitor comprising a capacitor element body comprised of alternately stacked dielectric layers composed of a dielectric ceramic composition and internal electrode layers, wherein:

• said dielectric ceramic composition comprises
• a main component including barium titanate;
• a fourth subcomponent including an oxide of R1, wherein R1 is at least one kind selected from a first element group composed of rare-earth elements having an effective ionic radius of less than 108 pm when having a coordination number of nine and at least includes Y;
• and
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from a second element group composed of rare-earth elements having an effective ionic radius of 108 pm to 113 pm when having a coordination number of nine;
• wherein a conductive material included in said internal electrode layer is Ni or a Ni alloy.

A dielectric ceramic composition, comprising:

• a main component including barium titanate;
• a first subcomponent including MgO;
• a second subcomponent including a sintering aid comprised of SiO2;
• a third subcomponent including V2O5;
• a fourth subcomponent including an oxide of R1, wherein R1 is Y;
• a fifth subcomponent including an oxide R2, wherein R2 is at least one kind selected from Dy, Tb and Gd;
• and
• a sixth subcomponent including MnO;
• wherein ratios of the respective subcomponents to 100 mol of said main component are
• the first subcomponent:
• 0.1 to 5 mol,
• the second subcomponent:
• 2 to 10 mol
• the third subcomponent:
• 0.5 mol or less, and
• the sixth subcomponent:
• less than 0.25 mol;
• and
• a diffusion part including at least said R1 and R2 exists inside respective dielectric particles composing said dielectric ceramic composition;
• wherein said dielectric particles comprise a ferroelectric part substantially not including said R1 and R2 and a diffusion part existing around the ferroelectric part;
• a grain boundary segregation part exists around the diffusion part;
• said diffusion part and grain boundary segregation part include at least said R1 and R2;
• and
• when assuming respective existential quantities of R1 and R2 in said diffusion part are MAR1 and MAR2 and respective existential quantities of R1 and R2 in said grain boundary segregation part are MBR1 and MBR2 relationships of (MBR1/MBR2)>1 and (MAR1/MAR2)<(MBR1/MBR2) are satisfied.

A multi-layer ceramic capacitor comprising a capacitor element body comprised of alternately stacked dielectric layers composed of a dielectric ceramic composition and internal electrode layers having as a main component a conductive material composed of Ni or a Ni alloy, wherein

• said dielectric ceramic composition comprises
• a main component including barium titanate;
• a first subcomponent including MgO;
• a second subcomponent including a sintering aid comprised of SiO2;
• a third subcomponent including V2O5;
• a fourth subcomponent including an oxide of R1, wherein R1 is Y;
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from Dy, Tb and Gd;
• and
• a sixth subcomponent including MnO;
• wherein ratios of the respective subcomponents to 100 mol of said main component are
• the first subcomponent:
• 0.1 to 5 mol,
• the second subcomponent:
• 2 to 10 mol
• the third subcomponent:
• 0.5 mol or less,
• a total of the fourth subcomponent and the fifth subcomponent:
• 10 mol or less, wherein the number of mole of the fourth subcomponent and the fifth subcomponent is a ratio of R1 and R2 alone, and
• the sixth subcomponent:
• less than 0.25 mol;
• wherein a rated voltage is 100V or more.

A multi-layer ceramic capacitor comprising a capacitor element body comprised of alternately stacked dielectric layers composed of a dielectric ceramic composition and internal electrode layers having as a main component a conductive material composed of Ni or a Ni alloy, wherein

• said dielectric ceramic composition comprises
• a main component including barium titanate;
• a first subcomponent including MgO;
• a second subcomponent including a sintering aid comprised of SiO2;
• a third subcomponent including V2O5;
• a fourth subcomponent including an oxide of R1, wherein R1 is Y;
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from Dy, Tb and Gd;
• and
• a sixth subcomponent including MnO;
• wherein ratios of the respective subcomponents to 100 mol of said main component are
• the first subcomponent:
• 0.1 to 5 mol,
• the second subcomponent:
• 2 to 10 mol
• the third subcomponent:
• 0.5 mol or less,
• the fourth subcomponent:
• 0.1 to 10 mol, wherein the number of mole of the fourth subcomponent is a ratio of R1 alone,
• the fifth subcomponent:
• 0.1 to 10 mol, wherein the number of mole of the fifth subcomponent is a ratio of R2 alone, and
• the sixth subcomponent:
• less than 0.25 mol;
• wherein a rated voltage is 100V or more.

A multi-layer ceramic capacitor comprising a capacitor element body comprised of alternately stacked dielectric layers composed of a dielectric ceramic composition and internal electrode layers having as a main component a conductive material composed of Ni or a Ni alloy, wherein

• said dielectric ceramic composition comprises
• a main component including barium titanate;
• a first subcomponent including MgO;
• a second subcomponent including a sintering aid comprised of SiO2;
• a third subcomponent including V2O5;
• a fourth subcomponent including an oxide of R1, wherein R1 is Y;
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from Dy, Tb and Gd;
• and
• a sixth subcomponent including MnO;
• wherein ratios of the respective subcomponents to 100 mol of said main component are
• the first subcomponent:
• 0.1 to 5 mol,
• the second subcomponent:
• 2 to 10 mol
• the third subcomponent:
• 0.5 mol or less, and
• the sixth subcomponent:
• less than 0.25 mol;
• and
• a diffusion part including at least said R1 and
• R2 exists inside respective dielectric particles
• composing said dielectric ceramic composition;
• wherein a rated voltage is 100V or more.

A dielectric ceramic composition, comprising:

• a main component including barium titanate;
• a fourth subcomponent including an oxide of R1, wherein R1 is at least one kind selected from a first element group composed of rare-earth elements having an effective ionic radius of less than 108 pm when having a coordination number of nine;
• and
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from a second element group composed of rare-earth elements having an effective ionic radius of 108 pm to 113 pm when having a coordination number of nine;
• wherein the effective ionic radius of rare-earth elements composing said first element group is over 106 pm.

A dielectric ceramic composition, comprising:

• a main component including barium titanate;
• a fourth subcomponent including an oxide of R1, wherein R1 is at least one kind selected from a first element group composed of rare-earth elements having an effective ionic radius of less than 108 pm when having a coordination number of nine, and at least includes Y;
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from a second element group composed of rare-earth elements having an effective ionic radius of 108 pm to 113 pm when having a coordination number of nine;
• wherein the effective ionic radius of rare-earth elements composing said first element group is over 106 pm.

An electronic device comprising a dielectric layer composed of a dielectric ceramic composition, wherein:

• said dielectric ceramic composition comprises
• a main component including barium titanate;
• a fourth subcomponent including an oxide of R1, wherein R1 is at least one kind selected from a first element group composed of rare-earth elements having an effective ionic radius of less than 108 pm when having a coordination number of nine;
• and
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from a second element group composed of rare-earth elements having an effective ionic radius of 108 pm to 113 pm when having a coordination number of nine;
• wherein a diffusion part at least including said R1 and R2 exists inside respective dielectric particles composing said dielectric ceramic composition;
• wherein said dielectric particles comprise a ferroelectric part substantially not including said R1 and R2 and a diffusion part existing around the ferroelectric part;
• a grain boundary segregation part exists around the diffusion part;
• said diffusion part and grain boundary segregation part include at least said R1 and R2;
• and
• when assuming respective existential quantities of R1 and R2 in said diffusion part are MAR1 and MAR2 and respective existential quantities of R1 and R2 in said grain boundary segregation part are MBR1 and MBR2, relationships of (MBR1/MBR2)>1 and (MAR1/MAR2)<(MBR1/MBR2).

An electronic device comprising a dielectric layer composed of a dielectric ceramic composition, wherein:

• said dielectric ceramic composition comprises
• a main component including barium titanate;
• a fourth subcomponent including an oxide of R1, wherein R1 is at least one kind selected from a first element group composed of rare-earth elements having an effective ionic radius of less than 108 pm when having a coordination number of nine and at least includes Y;
• and
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from a second element group composed of rare-earth elements having an effective ionic radius of 108 pm to 113 pm when having a coordination number of nine;
• wherein when assuming the effective ionic radius of Y included in said first element group is ry and the effective ionic radius of rare-earth elements composing said second element group is r2, said second element group is composed so that a ratio of ry and r2 (r2/ry) satisfies a relationship of 1.007<(r2/ry)<1.05.

An electronic device comprising a dielectric layer composed of a dielectric ceramic composition, wherein:

• said dielectric ceramic composition comprises
• a main component including barium titanate;
• a fourth subcomponent including an oxide of R1, wherein R1 is at least one kind selected from a first element group composed of rare-earth elements having an effective ionic radius of less than 108 pm when having a coordination number of nine;
• and
• a fifth subcomponent including an oxide of R2, wherein R2 is at least one kind selected from a second element group composed of rare-earth elements having an effective ionic radius of 108 pm to 113 pm when having a coordination number of nine and at least includes Tb;
• wherein a diffusion part at least including said R1 and R2 exists inside respective dielectric particles composing said dielectric ceramic composition;
• wherein said dielectric particles comprise a ferroelectric part substantially not including said R1 and R2 and a diffusion part existing around the ferroelectric part;
• a grain boundary segregation part exists around the diffusion part;
• said diffusion part and grain boundary segregation part includes at least said R1 and R2;
• and
• when assuming respective existential quantities of R1 and R2 in said diffusion part are MAR1 and MAR2 and respective existential quantities of R1 and R2 in said grain boundary segregation part are MBR1 and MBR2, relationships of (MBR1/MBR2)>1 and (MAR1/MAR2)<(MBR1/MBR2).