Shin-etsu Chemical Co., Ltd.

Masatoshi Ishii

Hajime Kitamura

Hiroyuki Miyamoto

Masami Kaneyoshi

Yukihiro Kuribayashi

Genji Noguki

Masanobu Uchida

Yuji Kimura

Hiroto Sugahara

Naofumi Shinya

Toshihiro Tsumori

Shigenobu Tajima

Takehisa Minowa

Hiroki Yoshikawa

Toru Shirasaki

Shigeru Konishi

Shigeru Sakai

Norifumi Yoshida

Satoshi Shima

Yu Hamaguchi

Akihiko Yoshida

Yukimi Jyoko

The present invention relates to a method for producing a hexafluoromanganate(IV), said method being characterized by comprising: inserting an anode and a cathode into a reaction solution that contains a compound containing manganese having an atomic valence of less than 4 and/or manganese having an atomic valence of more than 4 and hydrogen fluoride; and then applying an electric current having an electric current density of 100 to 1000 A/mbetween the anode and the cathode. According to the present invention, it becomes possible to produce a hexafluoromanganate(IV) in which the content ratio of manganese having an atomic valence of 4 is high and the contamination with oxygen is reduced and which has high purity. When a complex fluoride red phosphor is produced using the hexafluoromanganate(IV) as a raw material, the phosphor produced has high luminescence properties, particularly high internal quantum efficiency.

Hexafluoromanganate (IV), complex fluoride phosphor, and methods respectively for producing said products

Provided is a method for producing a phosphor having a chemical composition represented by formula (I), AMF:Mn (I) (A is one type or more of an alkali metal selected from Li, Na, K, Rb, and Cs, and includes at least Na and/or K, and M is one type or more of a tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn.), the method comprising preparing a first hydrofluoric acid solution containing M and a second hydrofluoric acid solution containing A as well as either dissolving a compound containing Mn in either the first hydrofluoric acid solution or the second hydrofluoric acid solution or preparing a separate solution in which the compound containing Mn is dissolved. When the solutions are mixed to precipitate the phosphor of the formula (I), the solutions are mixed so that the concentration of M is 0.1 to 0.5 mol/liter when all the solutions are mixed. According to the present invention, a complex fluoride phosphor having excellent luminescence properties can be produced stably with high yield.

Complex fluoride phosphor and method for producing same

A wavelength conversion member which is a resin-molded article made of at least one type of thermoplastic resin selected from polyolefins, polystyrene, styrene copolymers, fluorocarbon resins, acrylic resins, nylons, polyester resins, polycarbonate resins, vinyl chloride resins, and polyether resins. The thermoplastic resin contains less than or equal to 30 mass % of a complex fluoride fluorophore represented by A(MMn)F(M is at least one type of tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn; A is at least one type of alkali metal selected from Li, Na, K, Rb, and Cs and including at least Na and/or K; and x is from 0.001 to 0.3) and having a particle diameter D, which is the median diameter at a cumulative volume of 50% in particle size distribution, of from 2 &#x3bc;m to 200 &#x3bc;m inclusive. The complex fluoride fluorophore being dispersed in the thermoplasticresin.

Wavelength conversion member and light-emitting device

A red phosphor in the form of a Mn-activated complex fluoride having the formula: AMF:Mn wherein M is one or more tetravalent elements selected from Si, Ti, Zr, Hf, Ge, and Sn, and A is one or more alkali metals selected from Li, Na, K, Rb, and Cs, and contains at least Na and/or K, is surface treated with a treating solution containing a surface treating agent selected from an organic amine, quaternary ammonium salt, alkyl betaine or fluorochemical surfactant, alkoxysilane, and fluorinated polymer.

Phosphor surface treatment method

In plating on an Si substrate, it has been strongly demanded to apply a treatment for providing an excellent adhesion so as to resist a post-processing such as polishing and for facilitating plating. Then, provided is a plated substrate adapted for hard disk medium comprising an Si single crystal; an amorphous layer on the substrate, the amorphous layer having thickness of 2 to 200 nm and containing Si and one or more metals selected from a group consisting of Ni, Cu and Ag; a multicrystal layer on the amorphous layer, the multicrystal layer having thickness of 5 to 1000 nm and containing Si and one or more metals selected from a group consisting of Ni, Cu and Ag. Moreover, provided is a method for manufacturing a plated substrate adapted for hard disk medium comprising steps of applying a chemical etching treatment of a natural oxide film and a surface Si portion on an Si single crystal substrate; and forming a film on the etched surface of the substrate in a sulfate or hydrochloride bath containing no reductant within a pH range of 7.2 to 12.8 at liquid temperature of 70 to 100&#xb0; C.

Plated substrate for hard disk medium

There is provided A method for producing an optical device by bonding optical elements each other without using adhesive wherein the optical elements are bonded each other by using optical elements in which the relation between linear expansion coefficients &agr;1 and &agr;2 (/&deg; C.) of each of the optical elements to be bonded and thickness t2 (m) of one of the optical elements satisfies the following formula: &verbar;(&agr;1&minus;&agr;2)&times;t2&verbar;&lE;10 and t2&gE;2&times;10 ; and/or, by sticking the optical elements each other in the state of being heated, and then subjecting them to a heat treatment. There can be provided a small size and highly reliable optical devise by bonding optical elements each other without using an adhesive at a low cost.

Optical device and method for producing optical device

Provided is an inexpensive process for producing hydrogen absorbing alloy powder suitable for a nickel-metal hydride storage battery having a high rate discharge property, a high capacity and a long cycle life for repetition of charge and discharge. The process comprises a step of an addition of a rare earth metal oxide and/or hydroxide to a hydrogen absorbing alloy powder, a wet or dry mixing step and a thermal treatment step in an inert atmosphere or in a vacuum.

Process for producing hydrogen absorbing alloy powder and hydrogen absorbing alloy electrode

A method for making hydrogen storage alloy powder comprises quenching a melt of a hydrogen storage alloy, breaking the quenched alloy into fine pieces provided that said alloy is in non-powder form after the quenching, and subjecting the fine pieces to treatment with a solution containing a conjugated unsaturated compound which has five or more conjugated &pgr; bonds in the molecule and a molecular weight of 100 or above.

Method for making hydrogen storage alloy powder and electrode comprising the alloy powder

Provided is a hydrogen absorbing alloy powder for use in nickel-metal hydride storage batteries having a high capacity, excellent initial characteristics and a long life. Specifically provided is a process for the production of a hydrogen absorbing alloy powder which includes the steps of treating a hydrogen absorbing alloy powder with an acid solution, and subsequently treating the hydrogen absorbing alloy powder with a solution containing a condensed phosphoric acid having 2 to 20 phosphorus atoms per molecule and/or phytic acid, as well as an electrode formed of the hydrogen absorbing alloy powder produced by the above process. Also provided is a hydrogen absorbing alloy powder of the AB,type in which A is exothermic metal and B is endothermic metal, the hydrogen absorbing alloy powder being obtained by providing a hydrogen absorbing alloy in which A comprises a mixture composed of 20 to 50% by weight of Ce, 20 to 50% by weight of La, and the balance comprising rare earth elements other than Ce and La and inclusive of Y (yttrium), treating the hydrogen absorbing alloy powder with an acid solution, and further treating the hydrogen absorbing alloy powder with a solution containing a phosphorus compound, as well as an electrode formed of this hydrogen absorbing alloy powder.

Hydrogen absorbing alloy powder and electrodes formed of the hydrogen absorbing alloy powder

A method of producing a hydrogen absorbing alloy powder, which comprises a step of treating a pulverized hydrogen absorbing alloy with an acidic or alkaline solution of conjugated unsaturated compound having at least 5 conjugated .pi. bonds; and a negative electrode using a hydrogen absorbing alloy powder produced by the aforesaid method, which can ensure high initial activity and high initial capacity in the nickel-hydrogen secondary battery provided therewith.

Method of producing hydrogen absorbing alloy powder, and electrode using

A powder of a hydrogen storage alloy which comprises metallic nickel in or on the surfaces of the powder in an amount sufficient to impart a magnetization intensity of 0.5 to 6 emu/g to the powder. The powder has a specific surface area of 0.15 to 0.7 m.sup.2 /g when determined according to a BET adsorption method, an oxygen concentration of 0.15 to 1.5 wt %, and an average particle size of 10 to 100 .mu.m, with a size distribution wherein the content of particles having a size of 8 .mu.m or below is in the range of 30 wt % or below. An electrode for secondary cells is also described, which comprises the powder defined above.

Hydrogen storage alloy powder and an electrode comprising the same

A method of producing a hydrogen absorbing alloy powder, which comprises a step of treating a pulverized hydrogen absorbing alloy with a solution comprising a condensed phosphoric acid having 2 to 20 phosphorus atoms, phytic acid or a mixture thereof; and a negative electrode using a hydrogen absorbing alloy powder produced by the aforesaid method, which can ensure high initial activity and high initial capacity in the nickel-hydrogen secondary battery provided therewith.

A method of producing a hydrogen absorbing alloy powder, which comprises a step of treating a pulverized hydrogen absorbing alloy with a solution comprising a conjugated unsaturated compound having at least 5 conjugated .pi. bonds and a molecular weight of at least 100 and, prior to the this step, optionally comprises a step of treating a pulverized hydrogen absorbing alloy with a mineral acid or alkali; and an electrode using a hydrogen absorbing alloy powder produced by the aforesaid method.

Proposed is a method for the preparation of a powder of lanthanum manganite having excellent flowability with an angle of repose not exceeding 45.degree.. Different from conventional methods for the preparation of lanthanum manganite powder by the calcination of a powder blend of thermally decomposable compounds of lanthanum and manganese or by the precipitation of a composite carbonate of lanthanum and manganese with addition of an aqueous solution of ammonium carbonate to an aqueous solution of lanthanum and manganese compounds followed by calcination of the composite carbonate, the invention proposes to precipitate the composite carbonate by the addition of ammonium carbonate in a particulate form to the aqueous solution of lanthanum and manganese compounds followed by calcination of the composite carbonate.

Method for the preparation of a lanthanum manganite powder

Inventive rare earth oxide voidless spherical grains having a mean grain diameter of from about 20-300 .mu.m formed by granulating a rare earth oxide powder having a mean grain diameter of 1 .mu.m or less are disclosed. A granulation method is disclosed comprising slurrying a rare earth oxide powder by dispersing it in water, admixing a salt of an organic acid with the slurry, and spray-drying the slurry.

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Echizen, Japan

Masatoshi Ishii