Murata Manufacturing Co., Ltd.

Leibniz-institut Fuer Festkoerper-und Werkstofforschung Dresden E.v.

Leibniz Institute for Solid State and Materials Research Dresden

Shoichiro Suzuki

Koichi Banno

Taisuke Kanzaki

Akihiro Shiota

Masanori Nakamura

Masahiro Otsuka

Shinichi Yamaguchi

Akitaka Doi

Jun Ikeda

Toshikazu Takeda

Oliver G Schmidt

Shinichiro Kawada

Takafumi Okamoto

Daniel Grimm

Hiroyuki Hayashi

Hideki Ishii

Megumi Morita

Akira Ando

Hideaki Niimi

Tomomi Koga

Shinya Isota

Masaru Miyayama

Tadashi Okuzawa

Ivoyl P Koutsaroff

Martin Bauer

Seiichi Jono

Suetake Omiya

Yuji Noguchi

Yuya Ogawa

Takashi Oyama

A multilayer ceramic capacitor that includes a ceramic body including a stack of a plurality of dielectric layers and a plurality of internal electrodes; a first external electrode on a first end surface of the ceramic body and electrically connected to a first set of the plurality of internal electrodes; and a second external electrode on a second end surface of the ceramic body and electrically connected to a second set of the plurality of internal electrodes. The dielectric layer includes a plurality of dielectric grains including Ca, Zr, Ti and a rare earth element, P is present between the plurality of dielectric grains, and where at least a portion of the rare earth element is in a solid solution in the dielectric grains.

Multilayer ceramic capacitor

A roll-up type capacitor that includes a plurality of cylindrical parts arranged parallel to one another and which each are a rolled-up laminate; a first external electrode on respective first ends of the plurality of cylindrical parts; and a second external electrode on respective second ends of the plurality of cylindrical parts. When, prior to being rolled-up, a dimension of the laminate parallel to a rolling-up direction is a length L, and a dimension of the laminate perpendicular to laminating direction and the rolling-up direction is a width W, the roll-up type capacitor has two or more cylindrical parts when a ratio L/W is 4 or more; has three or more cylindrical parts when L/W is 3 to less than 4; has four or more cylindrical parts when L/W is 2 to less than 3; and has eight or more cylindrical parts when L/W is 1 to less than 2.

Roll-up type capacitor and process for producing the same

A roll-up type capacitor includes a cylindrical part, a first external electrode, and a second external electrode. The cylindrical part is a rolled-up laminate in which a lower electrode layer, a dielectric layer and an upper electrode layer are laminated in this order. The first external electrode is electrically connected to the upper electrode layer, and the second external electrode is electrically connected to the lower electrode layer, and the first external electrode and the second external electrode are respectively located on opposed sides of the cylindrical part such that they face to each other.

Capacitor and process for producing thereof

A multilayer ceramic capacitor having inner electrodes with a Ni-Metal A alloy, the Metal A being selected from Fe, V, Y, and Cu and dissolved in the Ni to form a solid solution. The percentage of the Metal A with respect to the total amount of Metal A and Ni in near-surface regions located at a depth of 2 nm from a surface of the inner electrode in contact with an adjacent ceramic dielectric layer is 1.4 or more atom %, and XA&#x2212;YA&#x2265;1.0, where XA represents the atomic percentage of Metal A in the near-surface regions and YA represents the atomic percentage of Metal A in mid-thickness regions of the inner electrodes. A method for producing a multilayer ceramic capacitor includes annealing the ceramic multilayer body under specific conditions to thereby increase, in the inner electrodes, the percentage of Metal A in the near-surface regions.

Multilayer ceramic capacitor and method for producing the same

A multilayer ceramic capacitor having inner electrodes containing at least one metal selected from Cu, Ag, Pd, Pt, Rh, Ir, Ru, and Os in an amount of 0.1 atom % or more that is dissolved in Ni and Sn to form a solid solution. The percentage of Sn with respect to the total amount of Ni and Sn in near-surface regions each located at a depth of 2 nm from a surface of the inner electrode in contact with an adjacent ceramic dielectric layer is 1.4 or more atom %, and X&#x2212;Y&#x2265;1.0, where X represents the atomic percentage of Sn in the near-surface regions and Y represents the atomic percentage of Sn in mid-thickness regions of the inner electrodes. A method for producing a multilayer ceramic capacitor includes annealing the ceramic multilayer body to increase, in the inner electrodes, the percentage of Sn in the near-surface regions.

A piezoelectric ceramic that contains an alkali niobate compound as its main ingredient. The alkali niobate compound has a perovskite crystal structure represented by ABOand contains an alkali metal. There exists Sn in part of site A, and Zr in part of site B. A radial distribution function obtained from a K-edge X-ray absorption spectrum of Sn has a first peak intensity P1 at a first distance from a Sn atom and a second peak intensity P2 at a second distance from the Sn atom. The second distance is greater than the first distance, and the peak intensity ratio P1/P2 is 2.7 or less.

Piezoelectric ceramic, method for producing piezoelectric ceramic, and piezoelectric ceramic electronic component

The present invention relates to the area of micro- and nanoelectronics and relates to ultra-compact micro capacitors, how they can be used, for example, in electrical and electronic devices. The object of the present invention consists in specifying an ultra-compact micro capacitor with the highest capacity. The problem is solved by an ultra-compact micro capacitor which is made from a rolled-up layer stack of alternatingly arranged layers of dielectric and/or electrically insulating and electrically conductive materials with rolled-up lengths of the layer stack of at least 1 mm, and an absolute electrical storage capacity of at least 10 nF. The problem is additionally solved by a method, in which a layer containing a water-soluble cellulose derivative is applied to a substrate and a layer stack to same, the layer containing the cellulose derivative is removed from the substrate using water, an organic solvent and/or an organic solvent mixture, and the layer stack is rolled up with a rolling speed of more than 0.1 mm/min.

Ultra compact micro capacitor and method for producing same

A laminated ceramic capacitor that includes a ceramic laminated body having a stacked plurality of ceramic dielectric layers and a plurality of internal electrodes opposed to each other with the ceramic dielectric layers interposed therebetween, and external electrodes on the outer surface of the ceramic laminated body and electrically connected to the internal electrodes. The internal electrodes contain Ni and Sn, a proportion of the Sn/(Ni+Sn) ratio is 0.001 or more in molar ratio is 75% or more in a region of the internal electrode at a depth of 20 nm from a surface opposed to the ceramic dielectric layer, and the proportion of the Sn/(Ni+Sn) ratio is 0.001 or more in molar ratio is less than 40% in a central region in a thickness direction of the internal electrode.

Laminated ceramic capacitor and method for manufacturing laminated ceramic capacitor

A multilayer ceramic capacitor that includes a ceramic laminated body having dielectric layers and internal electrodes at the interfaces between the dielectric layers, and external electrodes on the outer surface of the ceramic laminated body. The dielectric layers contain, as their main constituent, a perovskite-type compound including Ba, Ti, Zr, and M. M is at least one element of Ta, Nb, V, and W. The dielectric layers further contain Mn and Si as additive constituents. With respect to the total amount of Ti, Zr, and M, 40 mol %&#x3c;Zr&#x2264;90 mol %, M is 1 mol %&#x2264;M&#x2264;10 mol %. When the total amount of Ti, Zr, and M is regarded as 100 parts by mol, 1 part by mol&#x2264;Mn&#x2264;10 parts by mol, 1 part by mol&#x2264;Si&#x2264;5 parts by mol, and 0.5&#x2264;Mn/M&#x2264;3.0.

A multilayer sintered body having alternately stacked Ni-based inner electrodes and piezoelectric ceramic layers. The piezoelectric ceramic layers contain a main ingredient of a perovskite compound containing Nb, K, Na, and Li, at least one element M1 selected from Nd and Dy, and at least one element M2 selected from Ga and Al. The element M2 content is 0.071 parts by mole or less per 1 part by mole of the Nb in a solution obtained through a dissolution process. This multilayer piezoelectric ceramic electronic component is manufactured through the cofiring of conductive films as a precursor of the inner electrodes and ceramic green sheets as a precursor of the piezoelectric ceramic layers in a reducing atmosphere in which the oxidation of Ni is inhibited.

Multilayer piezoelectric ceramic electronic component and method for manufacturing multilayer piezoelectric ceramic electronic component

A multilayer ceramic capacitor that includes an internal electrode containing at least one kind of metal A selected from the group consisting of In, Ga, Zn, Bi, and Pb and dissolved in Ni to form a solid solution. The internal electrode has a ratio of A of 1.4 atomic percent or more to a total amount of A and Ni in a near-interface region located to a depth of 2 nm from a surface of the internal electrode facing a corresponding ceramic dielectric layer. A relation between a value X of atomic percent representing the ratio of A in the near-interface region and a value Y of atomic percent representing the ratio of A in a central region in a thickness direction of the internal electrode is X&#x2212;Y&#x2267;1.0. Such a multilayer capacitor is formed by annealing a ceramic stack under a predetermined condition to increase the ratio of metal A in the near-interface region of the internal electrode.

Multilayer ceramic capacitor and method of manufacturing multilayer ceramic capacitor

Method for manufacturing a ceramic laminated body

A ceramic capacitor having dielectric ceramic layers that include Ba, Re (Re is at least one of La, Ce, Pr, Nd, and Sm), Ti, Zr, M (M is at least one of Mg, Al, Mn, and V), Si, and optionally Sr, where at least some of the Ba, Re, Ti, and Zr and optionally Sr are in the form of a perovskite compound. Respective amounts, expressed as parts by mol, of the elements of the dielectric ceramic layers satisfy, with respect to a total of 100 of the Ti amount and the Zr amount, 0&#x2266;a&#x2266;20.0 where a is the Sr amount; 0.5&#x2266;b&#x2266;10.0 where b is the Re amount; 46&#x2266;c&#x2266;90 where c is the Zr amount; 0.5&#x2266;d&#x2266;10.0 where d is the M amount; 0.5&#x2266;e&#x2266;5.0 where e is the Si amount; and 0.990&#x2266;m&#x2266;1.050 where m is a ratio of a total of the Ba amount, the Sr amount, and the Re amount, to the total of the Ti amount and the Zr amount.

Laminated ceramic capacitor

A stacked ceramic capacitor that includes a ceramic body formed by stacking dielectric ceramic layers and internal electrodes mainly composed of Ni; and an external electrode formed on an outer surface of ceramic body. The dielectric ceramic layers are formed by using a dielectric ceramic composition that includes a main ingredient expressed by (KNaLiM2)(NbTaMgM4)O, where M2 is at least one of Ca, Sr and Ba, M4 is at least one of Zr, Hf and Sn, and a, b, c, d, w, x, y, and z satisfy predetermined relationships; and includes 2 to 15 molar parts of Mn with respect to 100 molar parts of a total content of Nb, Ta, Mg, and M4.

Dielectric ceramic composition, stacked ceramic capacitor using the same, and method of manufacturing the same

A laminate body includes a plurality of ceramic layers and capacitor conductors embedded in the laminate body so as to be opposed to each other via one of the ceramic layers. The capacitor conductors are made of an Al-based material, and the capacitor conductors include narrow portions, respectively, which function as fuse elements. The narrow portions have an average width smaller than an average width of portions of the capacitor conductors other than the narrow portions. As a result, the electronic component has an improved capability to protect its function as a capacitor when a short circuit occurs between capacitor conductors.

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Nagaokakyo, Japan

Shoichiro Suzuki