Murata Manufacturing Co., Ltd.

Tomotaka Hirata

Hitoshi Nishimura

Hiroyuki Wada

Kohei Shimada

Sui Uno

Hiroki Awata

Tatsuya Izumi

Tomomi Koga

Kenji Takagi

Masahiro Naito

Shinya Isota

Yasuhiro Nishisaka

Taketsugu Ogura

Seiichi Jono

Yasuko Ooe

A multilayer electronic component that includes a stacked body having therein a plurality of dielectric layers including a CZ-based perovskite phase and an element M2, a plurality of internal electrode layers including Ni, and an interface layer including the element M2 in at least a portion of an interface with the plurality of internal electrode layers. Element M2 is an element that has a binding energy between the CZ-based perovskite phase and Ni via the element M2 of less than or equal to −12.3 eV by first-principles calculation using a pseudopotential method. When amounts of elements included in the dielectric layers are expressed as parts by mol, a ratio m2 of an amount of the element M2 to an amount of the Zr in the interface layer is 0.03≤m2≤0.25.

Multilayer electronic component

A multilayer electronic component that includes a stacked body having therein a plurality of dielectric layers including a CZ-based perovskite phase and an element M1, a plurality of internal electrode layers including Cu, and an interface layer including the element M1 in at least a portion of an interface with the plurality of internal electrode layers. Element M1 is an element that has a binding energy between CZ and Cu via the element M1 of less than or equal to &#x2212;9.8 eV by first-principles calculation using a pseudopotential method. When amounts of elements included in the dielectric layers are expressed as parts by mol, a ratio m1 of an amount of the element M1 to an amount of the Zr in the interface layer is 0.03&#x2264;m1&#x2264;0.25.

A dielectric ceramic composition includes, as a main component, a perovskite compound containing Sr and Zr and may contain Ca and/or Ti, further contains Li and Si, and may contain Mn. When a total content of Zr and Ti is 100 parts by mol, a total content (100&#xd7;m) of parts by mol of Sr and Ca is 0.8&#x2264;m&#x2264;1.3, a content a of parts by mol of Mn is 0&#x2264;a&#x2264;10, a content b of parts by mol of Li is 5&#x2264;b&#x2264;15, a content c of parts by mol of Si is 20&#x2264;c&#x2264;40, a molar ratio x of Ca/(Sr+Ca) is 0&#x2264;x&#x2264;0.8, and a molar ratio y of Ti/(Zr+Ti) is 0&#x2264;y&#x2264;0.5.

Dielectric ceramic composition and multilayer ceramic capacitor

A ceramic electronic component or a dielectric ceramic composition having a first element group and a second element group. The first element group consists of Ba, Si, and Al, and contains in 100 parts by weight of the first element group, 20 to 40 parts by weight of BaO, 48 to 75 parts by weight of SiO, and 5 to 20 parts by weight of AlO. The second element group consists of at least one of Ti and Fe, Mn, Sr, and Mg, and contains, with respect to 100 parts by weight of the first element group, 1 to 10 parts by weight of MnO, 1 to 35 parts by weight of SrO, 0.1 to 6 parts by weight of MgO, and 1 to 35 parts by weight of TiOand/or FeO.

Ceramic electronic component and dielectric ceramic composition

A multilayer ceramic capacitor includes a laminated body including an inner layer portion including ceramic dielectric layers and internal electrodes, and outer layer portions including ceramic dielectric layers. External electrodes connected to the internal electrodes are provided on both ends of the laminated body. The main constituent of the inner layer portion is a perovskite-type compound represented by ABO. The outer layer portions include first outer layers and second outer layers respectively containing oxides that differ from each other in main constituents, and boundary reaction layers are provided between the first outer layers and the second outer layers. First ceramic dielectric layers outside the boundary reaction layers differ in color from second ceramic dielectric layers inside the boundary reaction layers.

Multilayer ceramic capacitor

A multilayer ceramic capacitor that includes a laminate which has a plurality of dielectric layers and a plurality of internal electrode layers respectively laminated. The dielectric layers are a perovskite type structure containing Ba, Sr, Zr, Ti and Hf, and optionally Ca, and further include V, wherein (number of moles of Sr)/(number of moles of Ba+number of moles of Ca+number of moles of Sr) is 0.6 to 0.95, (number of moles of Zr)/(number of moles of Zr+number of moles of Ti+number of moles of Hf) is 0.9 to 0.98, thicknesses of the dielectric layers are 1 &#x3bc;m or less, and an average particle size of dielectric particles constituting the dielectric layers is 0.8 &#x3bc;m or less.

A laminated ceramic capacitor having a laminated body composed of a plurality of ceramic layers for inner layers; a plurality of internal electrodes at the interfaces between the plurality of ceramic layers for inner layers; and a plurality of ceramic layers for outer layers, provided on the top and bottom so as to sandwich the plurality of ceramic layers for inner layers. The ceramic layers for inner layers are composed of a material containing a multiple oxide including an alkaline-earth metal. The ceramic layers for outer layers respectively have TiOceramic layers containing TiOas their main constituent for certain layers including the outermost layers, and multiple oxide ceramic layers containing a multiple oxide including an alkaline-earth metal for the other layers.

Laminated ceramic capacitor

A laminated body that contains a perovskite-type compound containing Sr, Ba, Zr, and Ti and containing; Si; Mn; Al; and V. When the total content of Zr and Ti is 100 parts by mol, the total content m of Sr and Ba meets 100&#x2266;m&#x2266;105, the Si content a meets 0.1&#x2266;a&#x2266;4.0, the Mn content b meets 0.1&#x2266;b&#x2266;4.0, the Al content c meets 0.01&#x2266;c&#x2266;3.0, the V content d meets 0.01&#x2266;d&#x2266;0.3, the molar ratio w of Sr and Ba to Sr meets 0.60&#x2266;w&#x2266;0.95, the molar ratio z of the total of Zr and Ti to Zr meets 0.92&#x2266;z&#x2266;0.98, w and y meets and the crystal grains are 1.2 &#x3bc;m or less in average grain size.

Laminated ceramic capacitor and manufacturing method therefor

A multilayer ceramic capacitor includes a ceramic main body including an inner layer portion including third ceramic layers and a plurality of inner electrodes arranged at interfaces between the third ceramic layers, and first and second outer layer portions respectively including first and second ceramic layers, the first and second ceramic layers being arranged vertically so as to sandwich the inner layer portion. The third ceramic layers and the first and second outer layer portions contain a perovskite-type compound represented by ABOwhere A contains one or more of Ba, Sr, and Ca, B contains one or more of Ti, Zr, and Hf, and O represents oxygen) as a main component. Where a rare-earth element concentration (C) in the third ceramic layers is compared to a rare-earth element concentration (C) in outermost layer portions including at least outermost surfaces of the first and second outer layer portions, C&#x3e;C(inclusive of C=0).

laminated ceramic capacitor which has favorable moisture resistance includes an inner layer section that has dielectric ceramic layers and internal electrodes stacked alternately, and outer layer sections formed outside the inner layer section. The dielectric ceramic layers have a perovskite-type compound including a main constituent containing Ca and Zr, and an additive containing Si and Mn. The average grain size in the dielectric ceramic layers constituting the outer layer sections is smaller than the average grain size in the dielectric ceramic layers constituting the inner layer section. The Si/Mn molar ratio in the dielectric ceramic near the interfaces between the internal electrodes and the dielectric ceramic layers is &#x2266;15.

A laminated ceramic capacitor that includes a laminated body including dielectric ceramic layers having crystal grains and crystal grain boundaries, and including internal electrode layers. An external electrode is formed on a surface of the laminated body, and is electrically connected to the internal electrode layers exposed at the surface of the laminated body. The laminated body has a composition including a calcium zirconate based perovskite-type compound as a main constituent, and further including Mn, Sr, and Si. When the laminated body is dissolved, the Si contained therein is 0.1 parts by mol or more and 10 parts by mol or less with respect to 100 parts by mol of Zr, and the molar ratio of Mn to Sr is 0.3 or more and 3.2 or less.

A highly moisture resistant dielectric ceramic is prepared by providing a compact containing a dielectric ceramic component powder and a second powder including a compound containing an alkali metal element, and firing the compact and a second composition containing an alkali metal element at the same time. A laminated ceramic capacitor using the dielectric ceramic is described.

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Nagaokakyo, Japan

Tomotaka Hirata