Taiyo Yuden Co., Ltd.

Minoru Ryu

Yoshiki Iwazaki

Koichiro Morita

Katsuya Taniguchi

Chie Kawamura

Tetsuo Shimura

Kazumichi Hiroi

Hidetoshi Masuda

Kenji Otake

Shinsuke Takeoka

Yukihiro Konishi

Mikio Tahara

Yoko Orimo

Kunihiko Nagaoka

Hirokazu Orimo

Daisuke Sakate

Sadanori Shimoda

Yoichiro Ogata

Satoko Namiki

Fumi Taniguchi

Teruo Atsumi

Natsumi Yuzakino

One aspect of the present invention is a multilayer ceramic capacitor including a plurality of dielectric layers composed of a dielectric ceramic containing grains whose main component is barium titanate having a core-shell structure made up of a core part and a shell part, and grains whose main component is calcium titanate having a core-shell structure made up of a core part and a shell part; and a plurality of internal electrodes stacked alternately with each of the plurality of dielectric layers.

Multilayer ceramic capacitor and method for manufacturing the same

A ceramic electronic device includes a multilayer structure in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked, a main component of the plurality of dielectric layers being a ceramic having a perovskite structure expressed by a general formula ABO. At least one of crystal grains of the plurality of dielectric layers has a core-shell structure. A dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a shell of the core-shell structure is larger than a dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a core of the core-shell structure.

Ceramic electronic device and manufacturing method of the same

A ceramic electronic device includes a multilayer chip in which a plurality of dielectric layers and a plurality of internal electrode layers are stacked. The plurality of internal electrode layers include Au. Each of the plurality of internal electrode layers includes an Au-containing layer of which an Au concentration with respect to all detected elements is 5 at % or more, on an interface between the each of the plurality of internal electrode layers and a dielectric layer next to the each of the plurality of internal electrode layers. A relationship of C&#x2264;500&#xd7;t/T is satisfied when a thickness of the each of the plurality of internal electrode layers is T nm, a thickness of the Au-containing layer is t nm, and an Au concentration with respect to a total of Ni and Au in a whole of the each of the plurality of internal electrode layers is C at %.

Ceramic electronic device

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the pair external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, is within &#xb1;20% of an average of the concentrations of the base metal in the five regions, and thicknesses of the first internal electrode and the second internal electrode are 0.2 &#x3bc;m or greater.

Multilayer ceramic capacitor

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing the base metal and a ceramic material mainly composed of barium titanate; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions, which are equally divided regions between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, is within &#xb1;20% of an average of the concentrations of the base metal in the five regions, and an atomic concentration ratio of Mg to Ti is 0 or greater and less than 0.002 in the dielectric layer.

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, is within &#xb1;20% of an average of the concentrations of the base metal in the five regions, and an average grain size in the dielectric layer is 200 nm or less.

In an embodiment, a multilayer ceramic capacitorhas a first external electrodeand a second external electrodethat each contain metal grains MP and dielectric grains DP, where an oxide of the same metal element constituting the metal grain MP, or MO, is present at the interface between the metal grain MP and the dielectric grain DP. The multilayer ceramic capacitor can prevent the hardness of its external electrodes from dropping, even when the external electrodes contain metal grains and dielectric grains.

In an embodiment, a magnetic body includes soft magnetic alloy grainscontaining Fe, element L, and element M (where element L is Si or Zr and element M is a metal element other than Si or Zr that oxidizes more easily than Fe), as well as oxide film produced from oxidization of part of these grains; wherein at least some of the bonds between adjacent soft magnetic alloy grainsare by way of the oxide film; the oxide film has an inner film, and an outer filmpositioned on the outer side of the inner film; and the inner filmcontains more of element L than element M, while the outer filmcontains more of element M than element L.

Magnetic body and electronic component comprising the same

In an embodiment, a multilayer ceramic capacitorhas a capacitor body comprising a capacitive partconstituted by multiple internal electrode layersthat are stacked with dielectric layersin between, as well as dielectric cover partsthat respectively cover both sides of the capacitive partin the stacking direction. Also, the dielectric layersof the capacitive part, and the dielectric cover parts, contain elemental manganese, and the elemental manganese is distributed in such a way that its quantity gradually decreases in the depth direction from the exterior faces of the dielectric cover partstoward the center of the dielectric layersof the capacitive part

Multilayer ceramic capacitor having manganese concentration gradient in thickness direction

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode that is coupled to one of the pair of external electrodes; a dielectric layer that is stacked on the first internal electrode and contains BaTiOand Ni; and a second internal electrode that is stacked on the dielectric layer, contains Ni, and is coupled to another one of the pair of external electrodes, wherein Ni is contained in five regions, which are equally divided region of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, and a Ni concentration in at least one of end regions located closest to the first internal electrode and the second internal electrode among the five regions is greater than a Ni concentration in a central region of the five regions by 10% or more.

Mutilayer ceramic capacitor with dielectric layers containing nickel

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions is within &#xb1;20% of an average of the concentrations of the base metal in the five regions, the five regions being obtained by dividing a region from a location 50 nm away from the first internal electrode of the dielectric layer to a location 50 nm away from the second internal electrode of the dielectric layer in a stacking direction between the first and second internal electrodes equally into five.

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the pair external electrodes, a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, being within &#xb1;20% of an average of the concentrations of the base metal in the five regions, an average grain number in the dielectric layer being three or less in the stacking direction between the first and second internal electrodes.

Multilayer ceramic capacitor with dielectric layers containing base metal

A multilayer ceramic capacitor includes a laminate constituted by internal electrode layers of different polarities alternately layered via dielectric layers, wherein the multilayer ceramic capacitor is such that the dielectric layers contain ceramic grains whose primary component is BaTiO, the ceramic grains contain Mo, Mn, rare earth R, and at least one of V and W, and the average valence number of Mo in the ceramic grains is 4.50 to 5.50. The multilayer ceramic capacitor can offer excellent service life characteristics and sufficiently suppress leak current even when the thickness of the dielectric layer is 0.8 &#x3bc;m or less.

[object Object]

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode that is coupled to one of the pair of external electrodes; a dielectric layer that is stacked on the first internal electrode and contains BaTiOand Ni; and a second internal electrode that is stacked on the dielectric layer, contains Ni, and is coupled to another one of the pair of external electrodes, wherein Ni concentrations obtained by analyzing five regions with a transmission electron microscope are within a range from 0.015 to 0.045, the five regions being obtained by dividing a region from a location 50 nm away from the first internal electrode of the dielectric layer to a location 50 nm away from the second internal electrode of the dielectric layer in a stacking direction between the first internal electrode and the second internal electrode equally into five.

A multilayer ceramic capacitor includes: a pair of external electrodes; a first internal electrode containing a base metal and coupled to one of the external electrodes; a dielectric layer stacked on the first internal electrode and containing a ceramic material and the base metal; and a second internal electrode stacked on the dielectric layer, containing the base metal, and coupled to another one of the external electrodes, wherein a concentration of the base metal in each of five regions, which are equally divided regions of a region between locations 50 nm away from the first and second internal electrodes in a stacking direction between the first and second internal electrodes, is within &#xb1;20% of an average of the concentrations of the base metal in the five regions, and the dielectric layer has a thickness of 0.6 &#x3bc;m or less.

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Takasaki, Japan

Minoru Ryu