Ceria-based composition including bismuth oxide, ceria-based composite electrolyte powder including bismuth oxide, method for sintering the same and sintered body made thereof

A method of preparing a sintered body, the method comprising:

• mixing together an undoped ceria or a metal-doped ceria;
• and an undoped bismuth oxide or a metal-doped bismuth oxide;
• to form a ceria-bismuth powder,
• wherein the ceria-bismuth powder comprises at least one selected from the group consisting of the metal-doped ceria and the metal-doped bismuth oxide,
• wherein the metal-doped ceria and/or the metal-doped bismuth oxide comprises a doping metal at a concentration between about 10 wt % and about 30 wt % with respect to the metal-doped ceria and/or the metal-doped bismuth oxide,
• wherein the undoped bismuth oxide or the metal-doped bismuth oxide is present in an amount equal to or more than about 10 wt % and less than about 50 wt % based on the total weight of the ceria-bismuth powder.
• wherein the doping metal is selected from the group consisting of samarium, gadolinium, lanthanum, zirconium, yttrium, ytterbium, erbium,
• praseodymium, neodymium, and combinations thereof;
• and
• sintering the mixed together ceria-bismuth powder at temperatures between about 800° C. to about 1000° C. to form the sintered body.