Sumitomo Chemical Company, Limited

National Institute of Advanced Industrial Science and Technology

Kunio Saegusa

Takeshi Hattori

Shinji Fujiwara

Hidekimi Kadokura

Akira Hasegawa

Shinichiro Tanaka

Yuzo Shigesato

Hironobu Koike

Masahide Mohri

Hisashi Watanabe

Kenji Saita

Tetsu Umeda

Yutaka Suzuki

Shozo Horikiri

Masao Yamagiwa

Masaji Harakawa

Tetsuo Oishi

Kazuya Koyama

Disclosed is a novel method for producing high-purity silicon at low cost. Particularly disclosed is a novel method for producing high-purity silicon, which can be suitably used as a raw material for solar cells, at low cost. Specifically, a method for producing silicon wherein silica is subjected to molten salt electrolysis in an electrolysis vessel comprises, in the following order, a step (1) wherein the silicon content in an silicon-containing alloy, which is in a liquid phase at the electrolysis temperature, is increased by using the alloy as the cathode and performing electrolysis; a step (2) wherein the silicon-containing alloy serving as the cathode is taken out of the electrolysis vessel before it reaches the concentration at which silicon begins to precipitate at the electrolysis temperature; a step (3) wherein silicon is solidified by cooling the taken-out silicon-containing alloy within the temperature range higher than the eutectic point but lower than the electrolysis temperature; and a step (4) wherein the solidified silicon is collected.

Method for producing silicon

Transparent electroconductive film and process for producing same

A method of producing an Indium Tin Oxide powder is described. A method of producing an Indium Tin Oxide powder comprising the steps of: (1) mixing a raw aqueous solution containing indium ions and tin ions and having a proportion of divalent tin ions in the tin ions of 50 wt % or more with an alkali aqueous solution, (2) separating the product into solid and liquid, and (3) calcinating the resulted solid.

Method of producing Indium Tin Oxide powder

A method for producing an indium-containing aqueous solution having a reduced amount of metal impurities is provided. A method for producing an indium-containing aqueous solution having a reduced amount of metal impurities which comprises bringing an aqueous solution containing indium and metal impurities whose hydrogen ion concentration is adjusted at 0.5 mol/L to 3 mol/L into contact with a non-chelate ion-exchange resin to remove the metal impurities, and a method for producing an indium-containing aqueous solution having a reduced amount of metal impurities which comprises bringing an aqueous solution containing indium and metal impurities into contact with a chelate ion-exchange resin to remove the metal impurities are provided.

Methods for producing indium-containing aqueous solutions containing reduced amounts of metal impurities

A glass paste comprising an inorganic powder, wherein the powder has a refractive index of 2.0 or more, a reflective index at wavelengths of light of 400 nm, 550 nm and 700 nm in a light reflection spectrum of 80% or more, a primary particle size measured by scanning electron microscopy of from 0.1 &mgr;m to 10 &mgr;m, and a BET specific surface area of from 0.1 m /g to 15 m /g.

Glass paste

Method for producing high density indium-tin-oxide sintered body

A metal oxide powder except &agr;-alumina, is disclosed comprising polyhedral particles having at least 6 planes each, a number average particle size of from 0.1 to 300 &mgr;m, and a D,/D,ratio of 10 or less where D,and D,are particle sizes at 10% and 90% accumulation, respectively from the smallest particle size side in a cumulative particle size curve of the particles. This metal oxide powder contains less agglomerated particles, and has a narrow particle size distribution and a uniform particle shape.

Metal oxide powder and method for the production of the same

Disclosed is a process for producing dielectrics which satisfy the formula of:

Process for producing dielectrics and fine single crystal powders and

A method for producing an indium oxide-tin oxide powder, which comprises supplying to react an aqueous solution of an indium salt, an aqueous solution of a tin salt and an aqueous alkaline solution into water at 40.degree. C. or more and less than 100.degree. C. so that the pH during the reaction is maintained within the range from 4 to 6, forming a precipitate, washing the formed precipitate after solid-liquid separation, and calcining the precipitate at 600.degree. C. or more and 1300.degree. C. or less.

Indium oxide-tin oxide powders and method for producing the same

A method for producing a double metal oxide of the general formula: XMO.sub.3 in which X is Li, Na, K, Pb, Ba, Mg, Ca, Sr, La, Y or Bi, and M is Al, Mn, Ti, Zr, Sn, Mg, Zn, Fe, Co, Ni, Nb, Ta or W, which has a narrow particle size distribution and contains few agglomerates, by calcining a mixture of a simple oxide of metal X and a simple oxide of metal M; amorphous double metal oxide particles comprising X and M or their mixture; or metal oxide precursors which are converted to said simple metal oxides or said double metal oxide, in the presence of iodine or hydrogen iodide.

Method for producing double metal oxide powder

A method for producing a metal oxide powder which comprises heating a metal or metals in an atmosphere gas comprising a halogen gas, a hydrogen halide gas or a mixture of these gases in a concentration of from 0.5% by volume or more to 99.5% by volume or less; and oxygen, water vapor or a mixture of these gases in a concentration of from 0.5% by volume or more to 99.5% by volume or less.

Method for producing metal oxide powders

Tin oxide whisker having a length of 0.1 to 100 .mu.m, a thickness of 0.005 to 5 .mu.m, and a ratio of the length to the thickness of at least 5, containing optionally a dopant such as antimony and bismuth, which contains no or few agglomerates and has excellent dispersibility in a matrix component.

Tin oxide whisker

A method for producing an iron-containing complex oxide powder represented by the general formula:

Method for producing iron-containing complex oxide powders

A lamina having an excellent capacity of scattering ultraviolet rays comprising a laminar substance as a matrix and a finely divided metal or metal compound dispersed therein, wherein the difference in refractive index between the laminar substance and the finely divided metal or metal compound is not less than 0.1, and a cosmetic comprising the same as a UV screener.

Growing community of inventors

Tsukuba-gun, Japan

Kunio Saegusa