Ngk Insulators, Inc.

The University of Tokyo

Shuichi Ozawa

Hirofumi Yamaguchi

Nobuyuki Kobayashi

Natsumi Shimogawa

Kei Sato

Hironori Sakakibara

Tsutomu Nanataki

Takashi Suzuki

Iwao Ohwada

Ryuta Sugiura

Yukinobu Yura

Takayoshi Akao

Shigeki Okada

Atsushi Watanabe

Katsuyuki Takeuchi

Ritsu Tanaka

Kazuyuki Mizuno

Hiroki Fujita

Kei Kosaka

Kazuyuki Kaigawa

Shiho Iwai

Masao Takahashi

Naoto Ohira

Hirohito Kiyota

Tetsuya Hattori

Akira Urakawa

Yukio Aisaka

Yuji Noguchi

Masaru Miyayama

Shinsaku Maeda

Kouichi Kondou

Satoko Moriyama

A sensor elementincludes an element main bodythat includes oxygen ion-conductive solid electrolyte layers (to), and a porous protective layerthat covers at least part of the element main body. The porous protective layerincludes a porous inner protective layerand a porous outer protective layerdisposed on the outer side of the inner protective layerand having a smaller average pore diameter than the inner protective layer

Sensor element and gas sensor

A sensor element includes a laminate, in which a plurality of oxygen ion-conductive solid electrolyte layers are stacked and in which a measurement object-gas flow portion is disposed, an inside pump electrode disposed on the inner circumferential surface of the measurement object-gas flow portion, an auxiliary pump electrode, and a measurement electrode. Then, the value of the volume ratio (Va=Vm/Vr) is 14.5 or more and 51.5 or less and the value of the volume ratio (Vb=Vs/Vr) is 5.0 or more and 17.5 or less, where the volume of the inside pump electrodeis specified as (Vm), the volume of the auxiliary pump electrodeis specified as (Vs), and the volume of the measurement electrodeis specified as (Vr).

A sensor element includes a sensor element main body a including an oxygen ion-conductive solid electrolyte layer and a porous protective layer covering at least part of the sensor element main body. Then, the porous protective layer has the value of the number of interfaces in a unit thickness direction, which is the number of particle interfaces of constituent particles every 100 &#x3bc;m in the thickness direction, of 15 or more and 250 or less.

Gas sensor element and gas sensor

The present invention relates to a cathode and a cathode active material plate for a lithium secondary battery, and the production method thereof. There is a feature of the present invention in that grooves consisting of a concave portion and having an infinite form (for example, an infinite cell-like shape) in a planar view are formed in a principal surface of the cathode active material plate.

Cathode and a cathode active material plate for a lithium secondary battery and method for manufacturing these

The first invention relates to powders for producing a Ni&#x2014;Cu&#x2014;Zn system ferrite ceramics sintered body, comprising ferrite calcined powders and NiO powders, wherein the specific surface area of said ferrite calcined powders is within the range of 4.0 m/g to 14.0 m/g, the spinel included in said ferrite calcined powders is such that Ni does not solve, the composition of said spinel is such that FeOis within the range of 49.0 mol % to 60.0 mol % and the remaining comprises CuO and ZnO, and the ratio of ZnO relative to CuO in mole percent is within the range of 1.0 to 4.0.

Powders used for producing Ni-Cu-Zn system ferrite ceramics sintered body and method for manufacturing the same

A method for manufacturing a fired ceramic body including a metal wire wherein the metal wire is placed in a mold and then, a ceramic slurry having a heat-gelling characteristic or a thermoset characteristic is poured into the mold. Subsequently, the ceramic slurry is dried and hardened to form a ceramic-compact-before-fired, and then, the ceramic-compact-before-fired is fired. In this firing process, a degreasing of the ceramic compact is firstly performed, and thereafter, a temperature of the ceramic compact is increased up to a second temperature at which the metal wire is softened and the ceramic compact is fired at a second temperature increasing rate. The second temperature increasing rate is set at such a rate that a shrinkage ratio of the ceramic compact when the temperature of the ceramic compact reaches the second temperature is smaller than or equal to a predetermined threshold shrinkage ratio.

Method for manufacturing a fired ceramic body including a metallic wire inside

A ferrite powder for producing a ferrite sintered body is provided, the ferrite powder having a median diameter D[&#x3bc;m] in a range from 0.1 to 0.8 &#x3bc;m, a degree of spinel formation in a range from 45 to 90%, and a remanent magnetization Br per unit mass [emu/g] satisfying the following formula after application of the maximum magnetic field of 15 kOe: 0.05&#x2266;Br&#x2266;2.0(ln.D)+6.3. This ferrite powder produces a homogeneous ferrite sintered body having very few cracks by gel casting.

Ferrite powder and its production method

Piezoelectric/electrostrictive ceramics having the composition represented by the general formula: xBNT-yBKT-zBT (x+y+z=1) are provided, wherein at least one kind among A-site elements are allowed to become deficient from stoichiometry in which a point (x, y, z) representing content ratios x, y and z of (Bi1/2Na1/2)TiO3, (Bi1/2K1/2)TiO3 and BaTiO3 is within a range including a border line of a quadrangle ABCD with a point A, a point B, a point C and a point D as vertices in a ternary phase diagram. Vacancies are formed in an A-site of a perovskite structure by allowing the A-site elements to become deficient from stoichiometry. An amount of A-site vacancies becomes at least 2 mol % to at most 6 mol %.

BNT-BKT-BT piezoelectric composition, element and methods of manufacturing

A method for manufacturing (Li, Na, K)(Nb, Ta)Otype piezoelectric material having an improved relative dielectric constant and an electric-field-induced strain is provided. The method is a process in which a formed body of powder particles constituted of a composition of (Li, Na, K)(Nb, Ta)Ois fired to produce the (Li, Na, K)(Nb, Ta)Otype piezoelectric material, and a constant temperature is kept in a range of 850 to 1000&#xb0; C. for a constant time before heating to a firing temperature.

[object Object]

A layered inductor is manufactured by layering 'silver-based conductive layers' and 'ferrite-based magnetic layers' and simultaneously firing these layers. The conductive layers are via-connected to form a helical coil. A shape of a cross sectional surface of the conductive layer, cut by a plane perpendicular to a longitudinal direction of each of the conductive layers is a substantial trapezoid shape, having an upper base and a lower base. A base angle &#x3b8; of the trapezoid shape at both ends of the lower base is equal to or greater than 50&#xb0; and is smaller than or equal to 80&#xb0;.

Layered inductor

A compact inductor comprises a coil, a coil-burying body, and a body for a closed magnetic circuit. The coil-burying body is a fired porous ceramic body having a first magnetic permeability, in which the coil is buried. In the coil-burying body, 'a through-holepassing through inside of the coil along an axis of the coil' is formed. The body for a closed magnetic circuit is a fired dense ceramic body having a second magnetic permeability greater than the first magnetic permeability. The body for a closed magnetic circuit is arranged closely/densely at an outer circumference portion of the coil-burying body and in the through-hole. A magnetic path is therefore formed mainly within the body for a closed magnetic circuit, and the magnetic flux density is reduced in an area close to the coil. Accordingly, an inductor having the excellent superimposed DC current characteristic is provided.

Compact inductor and a method for manufacturing the same

The invention provides a (Li, Na, K)(Nb, Ta)Otype piezoelectric/electrostrictive ceramic composition capable of being sintered at a low temperature and providing good electric field-induced strain at the time of high electric field application at a temperature for practical use. The piezoelectric/electrostrictive ceramic composition has an ABOtype composition formula wherein lithium, sodium, and potassium are contained as first elements; niobium and tantalum are contained as second elements; oxygen (O) is contained as a third element; A/B ratio is higher than 1; and the ratio of the number of Ta atoms to the total number of atoms of the second elements is 10 mol % or more and 50 mol % or less, and comprises a perovskite type oxide wherein the first elements are A site composing elements and the second elements are B site composing elements.

(Li, Na, K)(Nb, Ta)O3 type piezoelectric/electrostrictive ceramic composition containing 30-50 mol% Ta and piezoelectric/electrorestrictive device containing the same

The invention provides a (Li, Na, K)(Nb, Ta, Sb)Otype piezoelectric/electrostrictive ceramic composition excellent in the electric field-induced strain at the time of high electric field application. The piezoelectric/electrostrictive film of a piezoelectric/electrostrictive actuator is a sintered body of a piezoelectric/electrostrictive ceramic composition. The piezoelectric/electrostrictive ceramic composition comprises a perovskite type oxide comprising as A site elements, Li, Na, and K and as B site elements, Nb and Sb and having a ratio of the total number of atoms of the A site elements to the total number of atoms of the B site elements greater than 1 and not less than 1 mol % and not more than 10 mol % of the number of Sb atoms in the total number of atoms of the B site elements and a Mn compound added to said perovskite type oxide.

Piezoelectric/electrostrictive ceramic composition and piezoelectric/electrostrictive device

The piezoelectric/electrostrictive body is represented by a composition formula ABO(A includes at least one element selected from the group consisting of Li, Na and K, and B includes at least one element selected from the group consisting of Nb, Ta, Sb and Mn), and the body is formed so that a main phase is a tetragonal system, and the orientation degree of a (001) face after a polarization treatment is smaller than that of a (100) face, in a plane vertical to the applying direction of an electric field applied so as to perform the polarization treatment. The present inventive piezoelectric/electrostrictive body has a ratio between a diffraction peak intensity Iof the (001) face and a diffraction peak intensity Iof the (100) face of I/I&#x2266;1, in an X-ray diffraction pattern in the same plane after the polarization treatment.

Piezoelectric/electrostrictive body, and piezoelectric/electrostrictive element

There is disclosed a piezoelectric/electrostrictive body in which a polarization direction of a domain indicates reversible conversion in an electric field and a strain ratio increases, a manufacturing method of the same, and a piezoelectric/electrostrictive element. The piezoelectric/electrostrictive body includes a matrix phase represented by a composition formula ABO, and an additional, material phase included in the matrix phase, having at least a crystal structure of tetragonal system, represented by a composition formula ABOand having a composition different from that of the matrix phase. For example, an alkali-niobate-based material of the tetragonal system, BaTiO, PZT, PbTiO, or (Bi, Na)TiOis added as an additional material forming the additional material phase to an alkali-niobate-based matrix material forming the matrix phase to form the piezoelectric/electrostrictive body. An amount of the additional material to be added has a volume ratio of 5 vol % or more and 30 vol % or less (5 vol % or more and 45 vol % or less in a case where an additional material having a composition to which Mn has been added is used) with respect to the matrix material.

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Nagoya, Japan

Shuichi Ozawa