| http://www.w3.org/ns/prov#value | - In one aspect, the invention resides in a method of making a low cost, lanthanide-substituted, dimensionally and thermally stable, electrically conductive, porous ceramic air electrode structure which is characterized by the steps of: (a) providing powdered oxides or carbonates of a natural lanthanide mixture of at least two lanthanides from the group of La, Ce, Pr, Nd, Sm and other lanthanides (i
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