Sumitomo Chemical Company, Limited

Niigata University

Tetsu Umeda

Masahide Mohri

Yutaka Ito

Hironobu Koike

Kenji Toda

Mineo Sato

Kazuyoshi Uematsu

Kenji Nakane

Yoshio Uchida

Kunio Saegusa

Akira Hasegawa

Hisashi Watanabe

Shinichiro Tanaka

Yoshitaka Kawakami

Takumi Shibuta

Kohei Sogabe

An alumina having a multimodal particle size distribution wherein at least one of the particle sizes giving local maximum values in the particle size distribution is less than 10 &#x3bc;m, and wherein the alumina comprises 1 to 5 wt % of at least one of La and Ba.

Alumina and method for producing automotive catalyst using same

Provided are phosphors that can exhibit higher emission luminance. Phosphors in which the activator is included in a compound represented by Formula xMO.MO.yMO(wherein Mrepresents one or more of a group comprising Ca, Sr and Ba, Mrepresents Mg and/or Zn, Mrepresents Si and/or Ge, x is a value in the range 4 to 6 and y is a value in the range 2 to 4). Phosphors represented by Formula MEuMMO(wherein M, Mand Mhave the same meanings as above, and z is a value in the range 0.0001 to 0.3). The above phosphors have the same crystal structure as bredigite.

Phosphors having high light emission luminescence

A barium titanate powder and a method for producing the same are provided. The barium titanate powder comprises a perovskite structure having a ratio c/a of 1.008 or more and ratio d/D of from 1 to 1.5, wherein 'c' is a length of the c axis, 'a' is a length of the a axis in the perovskite structure, &#x201c;d&#x201d; is an average particle diameter and &#x201c;D&#x201d; is a equivalent specific surface area diameter. The method of producing a barium titanate powder, comprises the steps of: (1) heating a mixture containing a titanium compound and a barium compound under a gas atmosphere containing a halogen at a temperature of not less than about 200&#xb0; C. and less than the temperature for generation of barium titanate, (2) calcining the obtained mixture under an atmosphere containing substantially no halogen at a temperature of not lower than the temperature for generation of barium titanate.

Barium titanate powder and method for producing same

Provided is a fluorescent body for use in a near-ultraviolet excitation light-emitting element, comprising the compound given by formula (1), having part of element Mand/or Mtherein replaced by an activation element (M). MMPO(1) (Here, Mrepresents one or more elements chosen from the group comprising Ca, Sr, and Ba; Mrepresents one or more elements chosen from the group comprising Mg and Zn; a is a number between 1.5 and 2.5, inclusive; b is a number between 2.5 and 3.5, inclusive; and c is a number between 3.5 and 4.5, inclusive.) A fluorescent body in which Mis Sr and Mis Mg, and a fluorescent body in which Mis Eu are preferable. Also provided are a fluorescent paste having the fluorescent body, and a near-ultraviolet excitation light-emitting element having the fluorescent body and having a high luminescent intensity.

Fluorescent body for use in a near-ultraviolet excitation light-emitting element

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

An inorganic porous sintered body comprising inorganic particles of polyhedral crystals, said inorganic porous sintered body having pores formed by the inorganic particles, wherein said pores have a pore size distribution that a ratio of D10 to D90 is not more than 3 and D50 is 0.01-5 .mu.m when D10, D50 and D90 are pore sizes at 10%, 50% and 90% cumulation from the largest pore size of a cumulative pore volume distribution, respectively, and a porosity is 10-50%.

Inorganic porous sintered body and filter

Complex metal oxide powder and method for the production of the same

A method of preparing dense sintered bodies of beta alumina suitable for solid electrolytes, which comprises preparing a shaped body from a mixture containing an aluminum powder, a sodium compound, a structure stabilizer and a zirconia powder or from a mixture containing an aluminum powder, an alumina powder, a sodium compound, a structure stabilizer and a zirconia powder, and reaction-sintering the shaped body.

Growing community of inventors

Ushiku, Japan

Tetsu Umeda