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US 6,785,121 B2Granted
Multilayer ceramic capacitor and production method thereof
AssigneeTDK Corporation
InventorsYukie Nakano, Shunichi Yuri, Mari Miyauchi, Daisuke Iwanaga
Life of this patent
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Abstract
A multilayer ceramic capacitor having internal electrode layers and dielectric layers with dielectric particles is disclosed. An average particle diameter of the dielectric particles, when measured parallel with the direction of the internal electrode layers, is larger than a thickness of the dielectric layer. A ratio (R/d) between the average particle diameter (R) and the thickness (d) of the dielectric layer is 1<R/d<3.
Claims9
A multilayer ceramic capacitor comprising:
- internal electrode layers;
- and
- dielectric layers, the dielectric layers comprising particles, wherein an average particle diameter (R), in a direction parallel with said internal electrode layers, is larger than a thickness (d) of said dielectric layer, wherein a ratio (R/d) between said average particle diameter (R) and the thickness (d) of said dielectric layer satisfies 1<R/d<3, wherein the thickness (d) of said dielectric layer is less than 3 μm, and wherein the internal electrode layers are separated by a distance of no more than the size of at least one particle of said particles, wherein at least one of said dielectric layers comprises at least said dielectric particles and a grain boundary phase, and an area ratio of said grain boundary phase in a section of said dielectric layer is 2% or less.
A multilayer ceramic capacitor comprising:
- internal electrode layers;
- and
- dielectric layers, the dielectric layers comprising particles, wherein an average particle diameter (R), in a direction parallel with said internal electrode layers, is larger than a thickness (d) of said dielectric layer, wherein a ratio (R/d) between said average particle diameter (R) and the thickness (d) of said dielectric layer satisfies 1<R/d<3, wherein the thickness (d) of said dielectric layer is less than 3 μm, and wherein the internal electrode layers are separated by a distance of no more than the size of at least one particle of said particles, wherein said dielectric particles have a core-shell structure.
A multilayer ceramic capacitor comprising:
- internal electrode layers;
- and
- dielectric layers, the dielectric layers comprising particles, wherein an average particle diameter (R), in a direction parallel with said internal electrode layers, is larger than a thickness (d) of said dielectric layer, wherein a ratio (R/d) between said average particle diameter (R) and the thickness (d) of said dielectric layer satisfies 1<R/d<3, wherein the thickness (d) of said dielectric layer is less than 3 μm, and wherein the internal electrode layers are separated by a distance of no more than the size of at least one particle of said particles, wherein at least one of said dielectric layers is comprised of dielectric particles, a grain boundary and grain boundary phase, a segregation phase exists in said grain boundary phase, and said segregation phase contains at least two kinds of elements selected from the group consisting of Mn, Y, Si, Ca, V and W.
Dependencies are inferred from the claim text.