Title:
固体電解質用ランタンガレート系焼結体およびその製造方法、ならびにそれを固体電解質として用いた燃料電池
Document Type and Number:
Japanese Patent JP4191821
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a sintered lanthanum gallate having remarkably improved strength scarcely varying the thermal expansion coefficient and exhibiting high ionic conductivity in a low temperature range by adding a specific amount of alumina to a lanthanum gallate-type oxide. SOLUTION: The objective sintered material having cation constitution ratio lattice constant and symmetry keeping those of a lanthanum gallate-type oxide is produced by mixing 100 pts.wt. of a lanthanum gallate-type oxide powder having an average particle diameter of <=3 μm with 1.5-6 pts.wt. of alumina powder having a purity of >=99% and an average particle diameter corresponding to <=1/3 of that of the lanthanum gallate oxide, compression molding the mixture and baking at 1,300-1,400 deg.C. The lanthanum gallate-type oxide is a perovskite-type compound having a composition expressed by La0.9Sr0.1Ga0.8Mg0.2 Ox, etc., and stable crystal structure. A fuel cell having low working temperature and excellent characteristics is produced by using a solid electrolyte produced by baking an air electrode material and a fuel electrode material on both surfaces of a sintered lanthanum gallate sheet.
Inventors:
Yasuda Isamu
Yoshio Matsuzaki
Toshiyuki Koyama
Takahiro Yamakawa
Tsukamoto Keizo
Yoshio Matsuzaki
Toshiyuki Koyama
Takahiro Yamakawa
Tsukamoto Keizo
Application Number:
JP22525198A
Publication Date:
December 03, 2008
Filing Date:
July 24, 1998
Export Citation:
Assignee:
Tokyo Gas Co., Ltd.
Taiheiyo Cement Co., Ltd.
Nippon Ceratech Co., Ltd.
Taiheiyo Cement Co., Ltd.
Nippon Ceratech Co., Ltd.
International Classes:
C04B35/00; C04B35/495; C04B35/50; H01M8/02; H01M8/12
Domestic Patent References:
| JP10114520A | ||||
| JP9161824A |
Attorney, Agent or Firm:
Hiroshi Takayama