Ngk Spark Plug Company, Limited

Hisashi Kozuka

Kazushige Ohbayashi

Yasuyuki Okimura

Hideto Yamada

Masato Yamazaki

Takayuki Matsuoka

Toshiaki Kurahashi

Kazuaki Kitamura

Takashi Kasashima

Mina Sato

Toshitaka Honda

Hirokazu Kurono

Haruki Yoshida

Kuniharu Tanaka

Hironori Uegaki

Katsuya Takaoka

Kazuhiro Kurosawa

Shigehiro Ohtsuka

Ippei Kato

Kazuma Ito

Keisuke Nakagawa

Yoshinobu Hirose

Akira Seike

Yoshiteru Honda

Tomoko Hishida

Yuji Yasunishi

Kiyoshi Matsuda

A sintered electrically conductive oxide for an oxygen sensor electrode includes a crystal phase formed of a perovskite-type electrically conductive oxide containing at least La, Fe and Ni. The oxide has an absolute value of thermoelectromotive force at 770&#xb0; C. of 21.0 &#x3bc;V/K or less.

Sintered electrically conductive oxide for oxygen sensor electrode, and oxygen sensor using the same

An electrically conductive oxide sintered compact according to one embodiment of the present invention includes a crystal phase that has a perovskite oxide crystal structure represented by the composition formula: RECoCuNiOwhere RE is a rare-earth element; a+b+c+d=1; and 1.25&#x2264;x&#x2264;1.75, wherein the values of a, b, c and d respectively satisfy the following conditions: 0.474&#x2264;a&#x2264;0.512; 0.050&#x2264;b&#x2264;0.350; 0&#x2264;c&#x2264;0.250; and 0.050&#x2264;d&#x2264;0.350.

Electrically conductive oxide sintered compact, member for electrical conduction, gas sensor, piezoelectric element, and method for producing piezoelectric element

A gas sensor, characterized by having an electrode formed of a conductive oxide sintered body which contains a primary phase formed of a perovskite oxide containing at least La, Fe, and Ni; and a secondary phase formed of an LaMOphase or an LaMOphase (M=Co, Fe, Ni), wherein the conductive oxide sintered body has a conductivity of 300 S/cm or higher at room temperature.

Electrically conductive oxide sintered compact, member for electrical conduction, and gas sensor

A gas sensor control apparatus including a gas sensor element, a heater for heating the gas sensor element, and heater energization control means for feedback controlling the supply of electric current to the heater such that the internal resistance of the gas sensor element coincides with a target resistance. The gas sensor element has a solid electrolyte member and an electrode portion including an outside electrode and an inside electrode. At least a portion of the electrode portion is formed of an electrically conductive oxide whose main component is (i) a first perovskite phase which is represented by a composition formula of LaCoNiO(0.300&#x2264;x&#x2264;0.600, 0&#x2264;d&#x2264;0.4) and has a perovskite-type crystal structure, or (ii) a second perovskite phase which is represented by a composition formula of LaFeNiO(0.450&#x2264;y&#x2264;0.700, 0&#x2264;d&#x2264;0.4) and has a perovskite-type crystal structure.

Gas sensor control apparatus

A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase is 0.40&#x3c;(Na/K)&#x3c;3.0. The main phase has a crystal structure in which (i) first spots corresponding to a primitive lattice period and (ii) second spots corresponding to the lattice period two times the primitive lattice period and being weaker than the first spots appear in an electron beam diffraction image entering from the &#x3c;100&#x3e; direction with the main phase represented as a pseudo-cubic crystal system. Also, the area ratio of a crystal phase reflecting the second spots in the main phase is 33% or less, and the maximum grain size of crystals reflecting the second spots in the main phase is 25 nm or less.

Lead-free piezoelectric ceramic composition, piezoelectric element using the same, and method of manufacturing lead-free piezoelectric ceramic composition

A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide subphase. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase assumes a value in a range represented by 0.40&#x3c;(Na/K)&#x3c;3.0. The main phase has a crystal structure in which (i) first spots corresponding to a primitive lattice period and (ii) second spots corresponding to the lattice period two times the primitive lattice period and being weaker than the first spots appear in an electron beam diffraction image entering from the &#x3c;100&#x3e; direction with the main phase represented as a pseudo-cubic crystal system.

A gas sensor including a conductive oxide sintered body, the sintered body including a crystal phase having a perovskite-type oxide crystal structure represented by a compositional formula: RECuFeNiOwherein RE represents a rare earth element, wherein the following conditions: a+b+c+d=1 and 1.25&#x2264;x&#x2264;1.75 are satisfied, and wherein a, b, c, and d satisfy the following conditions: 0.375&#x2264;a&#x2264;0.524; 0.050&#x3c;b&#x2264;0.200; 0.025&#x2264;c&#x2264;0.250; and 0.150&#x2264;d&#x2264;0.350. Also disclosed is a conductive oxide sintered body, a wiring board including a conductor layer formed of the conductive oxide sintered body and a gas sensor including an electrode formed of the conductive oxide sintered body.

Gas sensor, electrically conductive oxide sintered body, and wiring board

Disclosed is a spark plug capable of suppressing high-frequency noise by improving the material of an electrical connection part between a center electrode and a metal terminal within an axial hole of an insulator. A spark plug has an electrical connection part arranged in an axial hole of an insulator to establish electrical connection between a center electrode and a metal terminal. The electrical connection part includes a conductor having a first crystal phase formed of a Fe-containing oxide and a second crystal phase formed of a conductive metal oxide of perovskite crystal structure.

Spark plug

A lead-free piezoelectric ceramic composition includes a first crystal phase made of an alkali niobate/tantalate type perovskite oxide having piezoelectric properties, and a second crystal phase made of an M-Ti&#x2014;O spinel compound (where the element M is a monovalent to quadrivalent element).

Unleaded piezoelectric ceramic composition, piezoelectric element using same, device, and method for manufacturing unleaded piezoelectric ceramic composition

A lead-free piezo-electric porcelain composition which contains a main phase having voids and which is formed of a first crystal phase composed of an alkali niobate/tantalate-based perovskite oxide having piezo-electric characteristics; and a sub-phase containing a second crystal phase composed of an ABO-based compound (where the element A is a monovalent element and the element B is one or more divalent to hexavalent elements). The sub-phase fills voids present in the main phase.

Lead-free piezo-electric porcelain composition, piezo-electric element using the same, and method for producing lead-free piezo-electric porcelain composition

Provided is a sintered oxide compact that has high electric conductivity and a small B-value (temperature coefficient), and is suitable for use as an electrically conductive material, and a circuit board that uses the sintered oxide compact. The sintered oxide compact is represented by a composition formula: REaCobNicOx (where RE represents a rare earth element, a+b+c=1, and 1.3&#x2266;x&#x2266;1.7), the sintered oxide compact includes a perovskite phase with a perovskite-type oxide crystal structure, and the a, b, and c satisfy the following relationships:0.459&#x2266;&#x2266;0.535,0.200&#x2266;&#x2266;0.475, and0.025&#x2266;&#x2266;0.300.

Sintered oxide compact and circuit board using same

A dielectric material comprising: a composition represented by aBaO.bTiO.cREO.dBiO, wherein a, b, c and d each independently represent a molar ratio satisfying the following requirements: a+b+c+d=1, 0.09&#x2266;a&#x2266;0.16, 0.54&#x2266;b&#x2266;0.62, 0.20&#x2266;c&#x2266;0.34 and 0&#x2266;d&#x2266;0.10; and RE represents a rare earth metal; and from 5 to 50 parts by mass, per 100 parts by mass of the composition, of a glass containing a component represented by kBaO.lZnO.mBO.nSiO, wherein k, l, m and n each independently represent a composition percentage satisfying the following requirements: k+l+m+n=100, 25&#x2266;k&#x2266;55, 5&#x2266;1&#x2266;30, 15&#x2266;m&#x2266;35 and 5&#x2266;n&#x2266;30.

Growing community of inventors

Ichinomiya, Japan

Hisashi Kozuka