Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Tsutomu Nanao

Tamiyuki Eguchi

Kenji Yamamoto

Kazuo Suzuki

Hiroshi Miyazaki

Masao Yokoyama

Masaaki Yoshino

A process for preparing a bulk powder for an oxide superconductor which comprises mixing an alcohol solution (I) of a copper nitrate and a lanthanoid metal nitrate with an alcohol solution (II) comprising at least one compound selected from the group consisting of a barium hydroxide and a barium alkoxide to give a coprecipitate, and thermally decomposing the coprecipitate. According to the present invention, compared to the solid-state reaction, fine particles having the particle size of not more than 1 .mu.m can be easily produced because barium carbonate comparatively stable to heat is not formed on calcination, and the desired bulk powder for oxide superconductor can be produced at even lower temperature. Consequently, the obtained bulk powder for the oxide superconductor has fine particles, e.g. the particle size being not more than 1 .mu.m, therefore, the powder is excellent in stoichinometry, large in surface energy and excellent in sintering property.

Coprecipitation process for preparing raw material powder for Y.sub.1

A solution containing at least two metals comprising (a) at least one member selected from the group consisting of a metal alkoxide and an oligomer thereof, and (b) at least one member selected from the group consisting of a metal chelate and a chelating agent. By decomposing the solution, there is provided an inorganic composite material and a maltilayer film which are useful as novel functional ceramic materials such as various sensors, electric conductive materials, magnetic recording materials, piezoelectric materials, dielectric materials and materials for optical devices.

Inorganic composite material and process for preparing the same

A process for preparing a porous ceramic thin film which comprises applying an anhydrous solution containing an organometallic compound and a multifunctional organic compound to a substrate, and thermally decomposing the compounds. The porous ceramic thin film prepared by the process has pores of not more than 10 .mu.m in pore size, and is useable as for materials of various sensors.

Porous ceramic thin film and process for preparing the same

Preparation of an amorphous silicon semiconductor by glow discharge decomposition in an atmosphere containing a silicon compound in a glow discharge decomposition chamber which has a radio frequency electric field and a magnetic field crossing the electric field at right angles and in which the substrate is arranged substantially at right angles to the electric field. The amorphous silicon thin layer has excellent characteristics, particularly an excellent photoconductivity, can be prepared at a high rate of film formation, and also an amorphous semiconductor PIN homo- or hetero-junction photovoltaic device prepared according to the process of the invention has excellent characteristics.

Process for preparing amorphous silicon semiconductor

A solution containing at least two metals comprising (a) at least one member selected from the group consisting of a metal alkoxide and an oligomer thereof, and (b) at least one member selected from the group consisting of a metal chelate and a chelating agent. By decomposing the solution, there is provided an inorganic composite material and a multilayer film which are useful as novel functional ceramic materials such as various sensors, electric conductive materials, magnetic recording materials, piezoelectric materials, dielectric materials and materials for optical devices.

A foam and flame-breakable resin composition comprising a non-inflammable agent, an auxiliary non-inflammable agent, a foaming agent, an ash coagulating agent and a resin system consisting essentially of a blend of a copolymer of ethylene and vinyl acetate having a high melt viscosity with the vinyl acetate content being between 40 to 80 weight percent and the molecular weight being more than 200,000, and polyvinyl chloride in a ratio of copolymer to polyvinyl chloride of 2:8 to 7:3. The composition may be further subjected to vulcanization treatment.

Growing community of inventors

Kobe, Japan

Tsutomu Nanao