Mixed ionic conductor and device using the same

Abstract

A mixed ionic conductor with an ion conductive oxide has a perovskite structure of the formula Ba a (Ce 1-b M 1 b )L c O 3-α , wherein M 1 is at least one trivalent rare earth element other than Ce; L is at least one element selected from the group consisting of Zr, Ti, V, Nb, Cr, Mo, W, Fe, Co, Ni, Cu, Ag, Au, Pd, Pt, Bi, Sb, Sn, Pb and Ga; with 0.9≦a≦1; 0.16≦b≦0.26; 0.01≦c≦0.1; and (2+ b −2 a )/2≦α<1.5. Such a mixed ionic conductor has not only the necessary conductivity for electrochemical devices such as fuel cells, but also superior moisture resistance.

1 - 4 . (canceled)  
   
   
       5 . A mixed ionic conductor comprising an ion conductive oxide having a perovskite structure of the formula Ba e Zr 1-z M 2   z O 3-β , wherein  
       0.9≦e≦1;  M 2  is at least one element selected from the group consisting of trivalent rare earth elements, Bi, Ga, Sn, Sb, and In;      with  0.01≦z≦0.3;  and  (2 +z− 2 e )/2≦β≦1.5.    
   
   
       6 . The mixed ionic conductor of  claim 5 , wherein 0.16≦z≦0.3.  
   
   
       7 . The mixed ionic conductor of  claim 5 , wherein M 2  is at least one element selected from the group consisting of trivalent rare earth elements and In.  
   
   
       8 . The mixed ionic conductor of  claim 7 , wherein M 2  is at least one element selected from the group consisting of Pr, Eu, Gd, Yb, Sc, and In.  
   
   
       9 - 13 . (canceled)  
   
   
       14 . A fuel cell comprising as a solid-state electrolyte a mixed ion conductor of  claim 5 .  
   
   
       15 . A gas sensor comprising as a solid-state electrolyte a mixed ionic conductor of  claim 5 .  
   
   
       16 - 17 . (canceled)