Asahi Glass Company, Limited

Tokyo Institute of Technology

Japan Science and Technology Agency

Agc Inc.

Setsuro Ito

Satoru Watanabe

Hideo Hosono

Kazuhiro Ito

Naoki Sugimoto

Naomichi Miyakawa

Katsuro Hayashi

Masahiro Hirano

Kazunari Watanabe

Yoshitake Toda

Yutaka Kuroiwa

Toshinari Watanabe

Satoru Narushima

Kei Maeda

Yasumasa Nakao

Motoichi Iga

Sung Wng Kim

Setsuhisa Tanabe

Mitsuru Watanabe

Masashi Miyakawa

Yuki Kondo

Jiro Chiba

Tatsuo Nagashima

Seiji Inaba

Ryuichi Tanabe

Yasuji Fukasawa

Chikao Tanaka

Hideki Kushitani

Madoka Ono

Sungwng Kim

Yousuke Amino

Kazuhiro Itoh

Osamu Honma

Disclosed herein is an amorphous C12A7 electride thin film which has an electron density of greater than or equal to 2.0×10cmand less than or equal to 2.3×10cm, and exhibits a light absorption at a photon energy position of 4.6 eV. Also disclosed herein is an amorphous thin film which is fabricated using a target made of a crystalline C12A7 electride, and containing an electride of an amorphous solid material including calcium, aluminum, and oxygen, in which an Al/Ca molar ratio of the thin film is 0.5 to 4.7.

Metal oxide thin film, organic electroluminescence element including the thin film, solar cell, and thin film fabrication method

Provides is low scattering silica glass suitable as a material of an optical communication fiber. Silica glass has a fictive temperature of at least 1,000&#xb0; C. and a void radius of at most 0.240 nm, as measured by positron annihilation lifetime spectroscopy. A method for heat-treating silica glass is also provided, which comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200&#xb0; C. and at most 2,000&#xb0; C. under a pressure of at least 30 MPa, and cooling the silica glass at an average temperature-decreasing rate of at least 40&#xb0; C./min during cooling within a temperature range of from 1,200&#xb0; C. to 900&#xb0; C. A method for heat-treating silica glass also comprises holding silica glass to be heat-treated in an atmosphere at a temperature of at least 1,200&#xb0; C. and at most 2,000&#xb0; C. under a pressure of at least 140 MPa, and cooling the silica glass in an atmosphere under a pressure of at least 140 MPa during cooling within a temperature range of from 1,200&#xb0; C. to 900&#xb0; C.

Low scattering silica glass and method for heat-treating silica glass

A C12A7 electride thin film fabrication method includes a step of forming an amorphous C12A7 electride thin film on a substrate by vapor deposition under an atmosphere with an oxygen partial pressure of less than 0.1 Pa using a target made of a crystalline C12A7 electride having an electron density within a range of 2.0&#xd7;10cmto 2.3&#xd7;10cm.

C12A7 electride thin film fabrication method and C12A7 electride thin film

The present invention relates to an anisotropic glass containing, in terms of mol % on the basis of oxides, POin a content of from 45 mol % to 57 mol %, two or more kinds of alkali metal oxides selected from the group consisting of LiO, NaO, KO, RbO, and CsO in a total content of from 30 mol % to 54 mol %, and at least one polyvalent element oxide other than POin a total content of from 0.1 mol % to 20 mol %, and having a birefringence of 30&#xd7;10or more.

Anisotropic glass

A light emitting device including an organic electroluminescence element is provided. The light emitting device may be a display device or a lighting device. The organic electroluminescence element includes an anode, a light emitting layer, and a cathode that are arranged in this order. An electron injection layer is arranged between the light emitting layer and the cathode. The electron injection layer is made of an amorphous C12A7 electride.

Organic electroluminescence element

The present invention relates to a mayenite-type compound in which a part of Ca of a mayenite-type compound containing Ca, Al and oxygen is substituted by at least one kind of an atom M selected from the group consisting of Be, Mg and Sr, in which the mayenite-type compound has an atom number ratio represented by M/(Ca+M) of from 0.01 to 0.50, and at least a part of free oxygen ions in a mayenite-type crystal structure are substituted by anions of an atom having electron affinity smaller than that of an oxygen atom.

Mayenite-type compound and process for production of same

To provide a method for preparing a mayenite-containing oxide containing a mayenite type compound and having a hydride ion density of at least 1&#xd7;10/cmwithout need for expensive facilities, control of complicated reaction conditions or a long period of reaction time. A method for preparing a mayenite-containing oxide, which comprises a firing step of heating a starting material having a molar ratio of CaO:AlObeing from 9:10 to 14:5 based on the oxides at a temperature of from 900 to 1,300&#xb0; C. to obtain a fired powder and a hydrogenation step of firing the fired powder at a temperature of at least 1,210&#xb0; C. and lower than 1,350&#xb0; C. in a hydrogen-containing gas having an oxygen partial pressure of at most 1,000 Pa to obtain a mayenite-containing oxide containing a mayenite type compound and having a hydride ion density of at least 1&#xd7;10/cm, and a method for preparing an electroconductive mayenite-containing oxide, which comprises irradiating the obtained mayenite-containing oxide with an ultraviolet ray etc. to obtain a mayenite-containing oxide containing an electroconductive mayenite type compound.

Method for preparing mayenite-containing oxide and method for preparing electroconductive mayenite-containing oxide

The present invention relates to a fluorescent lamp including: a discharge space containing a discharge gas and being surrounded by a glass; a discharge electrode; a phosphor; and a mayenite type compound provided on at least a part of an inner surface contacting the discharge gas. According to the fluorescent lamp of the present invention, a fluorescent lamp that has good luminous efficiency of ultraviolet ray from a discharge gas, has good discharge characteristics such as discharge starting voltage and discharge sustaining voltage in a fluorescent lamp, is chemically stable, has excellent oxidation resistance, has excellent sputtering resistance, and can achieve electric power saving is provided.

Fluorescent lamp

It is an object of the present invention to provide a new method for reducing the diameter of a bubble existing in a glass plate. Specifically, the present invention provides a method for reducing the diameter of a bubble existing in a glass plate, which comprises irradiating the vicinity of the bubble existing in the glass plate with a light beam emitted from a light source, to raise the temperature of the glass in the vicinity of the bubble to at least the melting point of the glass to reduce the maximum diameter of the bubble.

Method for reducing diameter of bubble existing in a glass plate

The present invention relates to a method for producing an oxide containing a conductive mayenite type compound and having an electron concentration of 1&#xd7;10/cmor more, from a raw material which is a combination of a calcium compound and an aluminum compound or is a compound containing calcium and aluminum, each having a molar ratio of calcium oxide and aluminum oxide ranging from 9:10 to 14:5 in terms of the oxides, the method including the steps of: heating and holding the raw material at 900 to 1,300&#xb0; C. to produce a calcined powder containing at least one oxide selected from the group consisting of a calcium aluminate, calcium oxide and aluminum oxide; and heating and holding the calcined powder at 1,200&#xb0; C. to less than 1,415&#xb0; C. under a reduction atmosphere in an inert gas atmosphere or a vacuum atmosphere each having an oxygen partial pressure of 1,000 Pa or less.

Process for producing an oxide

It is an object of the present invention to provide a method and apparatus for efficiently remove bubbles present on a surface of molten glass, which can solve a problem that bubbles remaining on a surface of molten glass are get inside at a time of forming the glass to cause inside bubbles, to thereby provide a glass substrate of good quality, and which can improve productivity of glass substrates; and to provide a process for producing glass employing the above method for removing bubbles. The present invention provides a method for removing bubbles from molten glass, which is a method for removing floating bubbles on a surface of molten glass, wherein a floating bubble on the surface of molten glass is irradiated with at least one laser beam.

Method for removing bubbles from molten glass and process for producing glass

Provided is a method for preparing an electroconductive mayenite type compound with good properties readily and stably at low cost. A production method of an electroconductive mayenite type compound comprising a step of subjecting a precursor to heat treatment, is a method for preparing an electroconductive mayenite type compound, comprising a step of subjecting a precursor to heat treatment; wherein the precursor is a vitreous or crystalline material, which contains Ca and Al, in which a molar ratio of (CaO:AlO) is from (12.6:6.4) to (11.7:7.3) as calculated as oxides, and in which a total amount of CaO and AlOis at least 50 mol %, and wherein the heat treatment is heat treatment comprising holding the precursor at a heat treatment temperature T of from 600 to 1415&#xb0; C. and in an inert gas or vacuum atmosphere with an oxygen partial pressure Pin a range of P&#x2266;10&#xd7;exp [{&#x2212;7.9&#xd7;l0/(T+273)}+14.4] in the unit of Pa.

Method for preparing electroconductive mayenite type compound

Provided is a method for preparing an electroconductive mayenite type compound with good properties readily and stably at low cost without need for expensive facilities, a reaction at high temperature and for a long period of time, or complicated control of reaction. A method for preparing an electroconductive mayenite type compound comprises a step of subjecting a precursor to heat treatment, wherein the precursor contains Ca and/or Sr, and Al, a molar ratio of (a total of CaO and SrO:AlO) is from (12.6:6.4) to (11.7:7.3) as calculated as oxides, a total content of CaO, SrO and AlOin the precursor is at least 50 mol %, and the precursor is a vitreous or crystalline material; and the method comprises a step of mixing the precursor with a reducing agent and performing the heat treatment of holding the mixture at 600-1,415&#xb0; C. in an inert gas or vacuum atmosphere with an oxygen partial pressure of at most 10 Pa.

To provide a method for preparing a mayenite type compound having electroconductivity imparted. A method for preparing an electroconductive mayenite type compound, which comprises melting a raw material containing Al and at least one element selected from the group consisting of Ca and Sr, holding the melt in a low oxygen partial pressure atmosphere having an oxygen partial pressure of not higher than 10 Pa, followed by cooling or annealing in a low oxygen partial pressure atmosphere or in atmospheric air for solidification, thereby to replace oxygen present in cages by electrons in a high concentration.

A glass fiber comprising core glass and clad glass, wherein the core glass consists essentially of from 25 to 70 mol % of Bi O , from 5 to 74.89 mol % of B O &plus;SiO , from 0.1 to 30 mol % of Al O &plus;Ga O , and from 0 to 10 mol % of CeO .

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Tokyo, Japan

Setsuro Ito