The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 1995
Filed:
May. 14, 1993
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
The present invention relates to an oxygen ion conductor consisting of a composition consisting of (1-x-y)ZrO.sub.2 --xSc.sub.2 O.sub.3 --yAl.sub.2 O.sub.3, and to solid fuel cells employing this ion conductor as the solid electrolyte. In order to obtain more desireable characteristics in the aforementioned composition, it is preferrable to apply limits to the composition such that: 0.05<x+y.ltoreq.0.16 and x>0, y>0, or, alternatively, such that: 0.07.ltoreq.x+.ltoreq.0.13 and 0.005.ltoreq.y.ltoreq.0.02. In the present invention phase transitions occuring during temperature change from room temperature to high temperatures are eliminated and mechanical strength with respect to the heat cycle is increased by adding as a secondary dopant a specific quantity of Al.sub.2 O.sub.3 to a specific ZrO.sub.2 --Sc.sub.2 O.sub.3 system composition which has a high degree of ion conductivity.
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