Mitsui Minings & Melting Co., Ltd.

Kazuhiko Kato

Isamu Yashima

Yasunori Tabira

Kenji Suzuoka

Kenzo Hanawa

Yoshihiro Yoneda

Naruo Ueda

Susumu Takahashi

Hiroki Takahashi

Naohiko Abe

Koichi Miyake

Naoyoshi Mochizuki

Koji Taniguchi

Ryoma Tsukuda

Akihiro Modeki

Satoshi Mogi

Mami Yoshida

Kenichi Amitani

Hiromu Watanbe

Norikazu Yamamoto

A rare earth phosphate particle containing a rare earth element A, where A is Sc, Y, La, Eu, Gd, Dy, Yb, or Lu, and a rare earth element B different from the element A, where B is Sc, Y, La, Eu, Gd, Dy, Yb, or Lu. The phosphate of the element A is preferably crystalline, with at least part of the element B dissolved in the phosphate of the element A in a solid state. The phosphate of the element A preferably has a xenotime or monazite crystal structure.

Rare earth phosphate particles, method for improving light scattering using same, and light scattering member and optical device including same

Disclosed is a tin oxide containing antimony and at least one element A selected from the group consisting of tantalum, tungsten, niobium, and bismuth. The antimony and the at least one element A selected from the group consisting of tantalum, tungsten, niobium, and bismuth are preferably dissolved in a solid state in tin oxide. The ratio of the number of moles of the element A to the number of moles of antimony, i.e., [(the number of moles of the element A/the number of moles of antimony)], is preferably 0.1 to 10.

Tin oxide, electrode catalyst for fuel cells, membrane electrode assembly, and solid polymer fuel cell

A manganese oxide particle having a hexagonal crystal structure or an analogous hexagonal crystal structure with an a-axis length of 8.73&#xb1;1 &#x212b; and a c-axis length of 14.86&#xb1;1 &#x212b;. The manganese oxide particle is preferably produced by a process including mixing an aqueous solution containing manganese (II) and an organic compound having a hydroxyl group while in a heated state with an alkali.

Manganese oxide particles and process for producing same

Fluorine-doped tin oxide particles having a structure characterized by peaks at at least 123&#xb1;5 cm, 139&#xb1;5 cm, and 170&#xb1;5 cmin Raman spectroscopy. The particles preferably have additional Raman spectral peaks at 78&#xb1;5 cm, 97&#xb1;5 cm, 109&#xb1;5 cm, 186&#xb1;5 cm, and 207&#xb1;5 cm. The particles preferably have a specific surface area of 10 to 300 m/g.

Fluorine-doped tin-oxide particles and manufacturing method therefor

A tin oxide particle having a structure characterized by peaks in Raman spectroscopy at at least 37&#xb1;9 cm, 57&#xb1;9 cm, 97&#xb1;9 cm, 142&#xb1;9 cm, 205&#xb1;9 cm, 255&#xb1;9 cm. The tin oxide particle preferably has an infrared transmittance of 80% or less at a wavelength of 1500 nm. The tin oxide particle preferably exhibits electroconductivity. The tin oxide particle is preferably substantially free from a dopant element that develops electroconductivity.

Tin oxide particles and method for producing same

A tin oxide particle having at least two diffraction peaks at 2&#x3b8; (deg) of 9&#xb1;1&#xb0; and 28&#xb1;1&#xb0; in XRD measurement by Cu/K&#x3b1; radiation. The tin oxide particle preferably shows diffraction peaks at 2&#x3b8; (deg) of 19&#xb1;1&#xb0;, 48&#xb1;1&#xb0;, and 59&#xb1;1&#xb0;. The tin oxide particle preferably has electroconductivity. The tin oxide particle is preferably produced by mixing an aqueous solution containing tin (II) and a hydroxyl-containing organic compound in a heated condition with an alkali.

Tin oxide particles and process for producing the same

A fine particulate polishing agent comprises fine particles of a solid solution composed of single-crystal ceric oxide and silicon dioxide and fine particles of silicon dioxide. A slurry polishing agent comprising the fine particulate polishing agent can be prepared by a method which comprises the steps of mixing, with stirring, single-crystal ceric oxide fine particles, silica sol and a liquid; drying the mixture; subjecting the dried particulate material to a thermal treatment at a high temperature and then cooling the solid solution powder formed by the thermal treatment and composed of single crystal ceric oxide and silicon dioxide; again mixing the powder with silica sol and a liquid; and then subjecting the mixture to deagglomeration using a wet pulverizing mill to give a slurry.

Fine particulate polishing agent, method for producing the same and

A fine particulate polishing agent is based on cerium oxide and silicon oxide; a slurry polishing agent comprises the foregoing fine particulate polishing agent which can be prepared by a method which comprises the steps of mixing, with stirring, cerium oxide fine particles, silica sol and a liquid; drying the mixture; mixing the material with a liquid; and then subjecting the mixture to deagglomeration using a wet pulverizing mill to give a slurry. Preferably, the dried particulate material is subjected to a thermal treatment at a high temperature of 150.degree. to 1200.degree. C., preferably 800.degree. to 900.degree. C., thereby to produce a solid solution of cerium oxide and silicon oxide. The slurry polishing agent can ensure the achievement of surface roughness comparable to or superior to that achieved by the colloidal silica polishing agents and a high polishing rate at least comparable to that achieved by the conventional cerium oxide polishing agents.

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Saitama, Japan

Kazuhiko Kato