Murata Manufacturing Co., Ltd.

Naoya Mori

Yasutaka Sugimoto

Osamu Chikagawa

Yoichi Moriya

Jun Urakawa

Satoshi Kuretake

Kentaro Ishihara

Nario Sugahara

Seiji Kanba

Hisatake Okamura

Naoki Mizoguchi

Hideto Sato

Kazuhide Takata

A honeycomb-structured catalyst for decomposing an organic substance, which includes a catalyst particle. The catalyst particle contains a perovskite-type composite oxide represented by ABMO, where the A contains at least of Ba and Sr, the B contains Zr, the M is at least one of Mn, Co, Ni, and Fe, y+z=1, 1.001&#x2264;x&#x2264;1.05, 0.05&#x2264;z&#x2264;0.2, and w is a positive value that satisfies electrical neutrality. The toluene decomposition rate is greater than 90% when toluene is decomposed using the honeycomb-structured catalyst subjected to a heat treatment at 1200&#xb0; C. for 48 hours and a gas that contains 50 ppm toluene, 80% nitrogen, and 20% oxygen as a volume concentration as a target at a space velocity of 30,000/h and a catalyst temperature of 400&#xb0; C.

Honeycomb-structured catalyst for organic substance decomposition and organic substance decomposing apparatus

A catalyst for decomposing an organic substance, the catalyst having a body which has a plurality of pores and the body contains a perovskite-type composite oxide represented by ABMO, where the A contains at least one selected from Ba and Sr, the B contains Zr, the M is at least one selected from Mn, Co, Ni, and Fe, 1.001&#x2264;x&#x2264;1.1, 0.05&#x2264;z&#x2264;0.2, y+z=1, and w is a positive value that satisfies electrical neutrality. The average pore diameter of the plurality of pores is 49 nm to 260 nm and the pore volume of each of the plurality of pores is 0.08 cm/g to 0.37 cm/g.

Catalyst for organic substance decomposition and organic substance decomposing apparatus

Provided is a fuel cell having a long product life. In the fuel cell, an interlayer is arranged between a portion of an interconnector which is formed of Ag or an Ag alloy and a first electrode containing Ni. The interlayer is formed of an oxide containing Ni and Ti.

Fuel cell

A forsterite powder with superior characteristics which can be sintered at a relatively low temperature can be economically produced, when a magnesium source, a silicon source, and copper particles are mixed to prepare a mixed powder containing 300 to 2,000 ppm by weight of the copper particles, and the mixed powder is fired. The magnesium source used is preferably Mg(OH), and the silicon source used is preferably SiO. A polycrystalline forsterite powder is preferably produced. The magnesium source, the silicon source, and the copper particles can be mixed in the presence of a solvent to prepare the mixed powder. The forsterite powder preferably contains 300 to 2,000 ppm by weight of copper, has a particle size of 0.20 to 0.40 &#x3bc;m and has a crystal size of 0.034 to 0.040 &#x3bc;m.

Method for producing forsterite powder, forsterite powder, sintered forsterite, insulating ceramic composition, and multilayer ceramic electronic component

Method for producing powder forsterite powder, forsterite powder, sintered forsterite, insulating ceramic composition, and multilayer ceramic electronic component

A glass ceramic composition is used for a multilayer ceramic substrateincluding glass ceramic layerslaminated, the multilayer ceramic substratebeing used for a multilayer ceramic module. The glass ceramic composition includes a first ceramic powder mainly composed of forsterite, a second ceramic powder mainly composed of at least one component selected from CaTiO, SrTiOand TiO, and a borosilicate glass powder containing LiO, MgO, BO, SiO, ZnO and AlO. The glass ceramic composition contains 3 percent by weight or more of the borosilicate glass powder and further contains at least one additive selected from the group consisting of CaO, BaO and SrO.

Glass ceramic composition, glass-ceramic sintered body, and monolithic ceramic electronic component

A glass ceramic composition for glass ceramic layers laminated in multilayer ceramic substrate included in multilayer ceramic module is provided. The glass ceramic composition contains a first ceramic powder mainly composed of forsterite, a second ceramic powder mainly composed of at least one material selected from CaTiO, SrTiOand TiO, and a borosilicate glass powder containing LiO, MgO, BO, SiO, ZnO and possibly AlO. The content of the borosilicate glass powder is about 3 percent by weight or more. The borosilicate glass powder further contains at least one additive selected from the group consisting of CaO, BaO and SrO.

A glass-ceramic composition contains first ceramic particles principally containing forsterite; second ceramic particles principally containing at least one selected from the group consisting of calcium titanate, strontium titanate, and titanium oxide; and borosilicate glass particles containing about 3% to 15% lithium oxide, about 20% to 50% magnesium oxide, about 15% to 30% boron oxide, about 10% to 45% silicon oxide, about 6% to 20% zinc oxide, 0% to about 15% aluminum oxide, and at least one additive selected from the group consisting of calcium oxide, barium oxide, and strontium oxide on a weight basis. The content of the borosilicate glass particles is about 3% or more; the lower limit of the content of the additive is about 2%; and the upper limit of the additive content is about 15%, about 25%, or about 25% when the additive is calcium oxide, barium oxide, or strontium oxide, respectively, on a weight basis.

Glass-ceramic composition, glass-ceramic sintered body, and monolithic ceramic electronic component

An insulating ceramic composition forming insulating ceramic layers () stacked in a multilayer ceramic substrate () used in a monolithic ceramic electronic component, such as a multilayer ceramic module (). The insulating ceramic composition contains a first ceramic powder mainly containing forsterite, a second ceramic powder mainly containing at least one compound selected from the group consisting of CaTiO, SrTiO, and TiO, and a borosilicate glass powder. The borosilicate glass powder contains 3 to 15 percent by weight of lithium in terms of LiO, 30 to 50 percent by weight of magnesium in terms of MgO, 15 to 30 percent by weight of boron in terms of BO, 10 to 35 percent by weight of silicon in terms of SiO, 6 to 20 percent by weight of zinc in terms of ZnO, and 0 to 15 percent by weight of aluminum in terms of AlO. The insulating ceramic composition can be fired at a temperature of 1000&#xb0; C. or less, and the resulting sintered compact has a low relative dielectric constant, a resonance frequency with a low temperature coefficient, and a high Q value.

Insulating ceramic composition, insulating ceramic sintered body, and mulitlayer ceramic electronic component

An insulating ceramic compact is provided which can be obtained by low-temperature firing, has a low relative dielectric constant and superior high frequency characteristics, and can be co-sintered with a material having a high coefficient of thermal expansion. The insulating ceramic compact is a fired mixture of an MgAl O -based ceramic and a borosilicate glass, in which an MgAl O crystal phase and at least one of an Mg B O crystal phase and an Mg B O crystal phase are precipitated as primary crystal phases.

Insulating ceramic compact, ceramic multilayer substrate, and ceramic electronic device

An insulative ceramic compact is composed of a fired mixture of (A) a MgAl O , Mg B O and/or Mg B  ceramic powder, and (B) a glass powder including from about 13 to 50% by weight of silicon oxide in terms of SiO , from 8 to 60% by weight of boron oxide in terms of B O , about 20% by weight or less of aluminum oxide in terms of Al O , and from about 10 to 55% by weight of magnesium oxide in terms of MgO. The insulative ceramic compact can be obtained by firing at low temperatures of about 1000&deg; C. or less, can be obtained by sintering with Ag or Cu, has a low dielectric constant and a high Q value, and is suitable for use in the high-frequency range.

Insulative ceramic compact

A composite multilayer ceramic electronic part includes a high dielectric-constant layer and at least one low dielectric-constant layer laminated with each other, the high dielectric-constant layer including a high dielectric-constant material and has a relative dielectric constant &egr;r of about 20 or more, and the low dielectric-constant layer including a low dielectric-constant material and has a relative dielectric constant &egr;r of about 10 or less. The high dielectric-constant material mainly comprises a BaO&mdash;TiO &mdash;ReO dielectric and a first glass composition, the BaO&mdash;TiO &mdash;ReO dielectric being represented by xBaO-yTiO -zReO , where x, y and z are % by mole and satisfy the following conditions: 8&lE;x&lE;18; 52.5&lE;y&lE;65; 20&lE;z&lE;40; and x&plus;y&plus;z&equals;100; and Re is a rare earth element, and the low dielectric-constant material comprises a composite of a ceramic and a second glass composition. The composite multilayer ceramic electronic part is resistant to delamination or deformation at the interface between the different types of materials, can be fired at low temperatures and is suitable for the high-frequency applications.

Composite multilayer ceramic electronic parts and method of manufacturing the same

A dual mode band-pass filter includes a dielectric body having first and second main surfaces, a metal film partially disposed on the first main surface of the dielectric body or at a predetermined level in the dielectric body, the metal film having any one of an opening, a protrusion, and a cut-out arranged to combine two resonant modes, at least one ground electrode disposed on the second main surface or in the interior of the dielectric body so as to be opposed to the metal film with a portion of the dielectric body being disposed therebetween, and a pair of input-output coupling circuits that are coupled with different portions of the metal film. The dielectric body includes a dielectric ceramic containing a ceramic and a glass as main constituents, capable of being fired simultaneously with Cu, Ag, or Au, and having a Q value of more than approximately 300 at about 10 GHz.

Dual mode band-pass filter

A dielectric ceramic compact is provided which can be obtained by sintering at a low temperature of 1000&deg; C. or less, can be obtained by co-sintering a dielectric ceramic composition with a metal having superior electrical conductivity, such as Ag, and has a high relative dielectric constant, a high Q and a small temperature coefficient of dielectric properties. The dielectric ceramic composition combines an xBaO-yTiO -zReO ceramic composition and a glass composition; wherein 8&lE;x&lE;18, 52.5&lE;y&lE;65, 20&lE;z&lE;40, in which x, y, and z represent mole percent, x&plus;y&plus;z&equals;100 and Re indicates a rare earth element, and the glass composition comprises about 10 to 25 wt % of SiO , about 10 to 40 wt % of B O , about 25 to 55 wt % of MgO, 0 to about 20 wt % of ZnO, 0 to about 15 wt % of Al O , about 0.5 to 10 wt % of Li O and 0 to about 10 wt % of RO in which R is at least one selected from the group consisting of Ba, Sr and Ca.

Dielectric ceramic composition

An insulating ceramic includes a fired mixture of a MgO&mdash;MgAl O ceramic and a borosilicate glass, in which MgAl O crystal phase and at least one of Mg B O crystal phase and Mg B O crystal phase are the major crystal phases. The insulating ceramic can be obtained by firing at low temperatures of 1000&deg; C. or less, can be fired in conjunction with Ag or Cu, has a high Q-value and satisfactory mechanical strength, and is suitable for use at high frequencies.

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Omihachiman, Japan

Naoya Mori