Title:
ELECTROCONDUCTIVE 12CaO·7Al2 O3 AND COMPOUND OF SAME TYPE, AND METHOD FOR PREPARATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2005/000741
Kind Code:
A1
Abstract:
A compound comprising 12CaO·7Al2O3 compound, 12SrO·7Al2O3 compound or a mixed crystal compound containing 12CaO·7Al2O3 and 12SrO·7Al2O3, and electrons introduced in the compound at a high concentration; and a method for preparing the compound comprising the electrons introduced through substituting many free oxygen atoms with electrons, which comprises providing a hydrostatic pressure press formed product of single crystals or a fine powder and holding the formed product in a gaseous alkali metal or alkaline earth metal at about 700°C, or comprises holding a hydrostatic pressure press formed product of a powder at about 1600°C in a carbon crucible, followed by slow cooling, or comprises shooting rare gas ions into a thin film of said compound kept at about 600°C. A compound obtained by substituting all the free oxygen atoms of said compound with electrons can be regarded as an electride compound having [Ca24Al28O64]4+ or [Sr24Al28O64]4+ as a cation and electrons as anions. Conventionally, in a solid solution system of CaO or SrO with Al2O3, a substance exhibiting a high electric conductivity (> 10-4S cm-1) at room temperature has been difficult to prepare.
Inventors:
Hosono, Hideo (4-212, shimotsuruma 2786 Yamato-shi Kanagawa, 01, 24200, JP)
Hirano, Masahiro (5-6 matsubara 5-chome, Setagaya-ku Tokyo, 43, 15600, JP)
Hayashi, Katsuro (6-20, shinjou-nakacho nakahara-k, Kawasaki-shi Kanagawa 43, 21100, JP)
Miyakawa, Masashi (Room 201, 11-2 namiki 1-chome, kanazawa-k, Yokohama-shi Kanagawa 05, 23600, JP)
Tanaka, Isao c/o Center For Crystal Science And Technology (faculty Of Engineering university Of Yamanashi, 7, miyamaech, Kofu-shi Yamanashi 21, 40000, JP)
Hirano, Masahiro (5-6 matsubara 5-chome, Setagaya-ku Tokyo, 43, 15600, JP)
Hayashi, Katsuro (6-20, shinjou-nakacho nakahara-k, Kawasaki-shi Kanagawa 43, 21100, JP)
Miyakawa, Masashi (Room 201, 11-2 namiki 1-chome, kanazawa-k, Yokohama-shi Kanagawa 05, 23600, JP)
Tanaka, Isao c/o Center For Crystal Science And Technology (faculty Of Engineering university Of Yamanashi, 7, miyamaech, Kofu-shi Yamanashi 21, 40000, JP)
Application Number:
PCT/JP2004/001507
Publication Date:
January 06, 2005
Filing Date:
February 12, 2004
Export Citation:
Assignee:
JAPAN SCIENCE AND TECHNOLOGY AGENCY (1-8 honcho 4-chome, Kawaguchi-shi Saitama, 12, 33200, JP)
Hosono, Hideo (4-212, shimotsuruma 2786 Yamato-shi Kanagawa, 01, 24200, JP)
Hirano, Masahiro (5-6 matsubara 5-chome, Setagaya-ku Tokyo, 43, 15600, JP)
Hayashi, Katsuro (6-20, shinjou-nakacho nakahara-k, Kawasaki-shi Kanagawa 43, 21100, JP)
Miyakawa, Masashi (Room 201, 11-2 namiki 1-chome, kanazawa-k, Yokohama-shi Kanagawa 05, 23600, JP)
Tanaka, Isao c/o Center For Crystal Science And Technology (faculty Of Engineering university Of Yamanashi, 7, miyamaech, Kofu-shi Yamanashi 21, 40000, JP)
Hosono, Hideo (4-212, shimotsuruma 2786 Yamato-shi Kanagawa, 01, 24200, JP)
Hirano, Masahiro (5-6 matsubara 5-chome, Setagaya-ku Tokyo, 43, 15600, JP)
Hayashi, Katsuro (6-20, shinjou-nakacho nakahara-k, Kawasaki-shi Kanagawa 43, 21100, JP)
Miyakawa, Masashi (Room 201, 11-2 namiki 1-chome, kanazawa-k, Yokohama-shi Kanagawa 05, 23600, JP)
Tanaka, Isao c/o Center For Crystal Science And Technology (faculty Of Engineering university Of Yamanashi, 7, miyamaech, Kofu-shi Yamanashi 21, 40000, JP)
International Classes:
C01F7/16; C04B35/44; H01B1/08; (IPC1-7): C01F7/18; C04B35/44; C30B29/22; H01B1/08
Attorney, Agent or Firm:
Nishi, Yoshiyuki (Nishi Patent Office, Suite 211 26-32, Nakahara 4-chom, Isogo-ku Yokohama-shi Kanagawa 36, 23500, JP)