| http://www.w3.org/ns/prov#value | - ABO3 where A is selected from the group consisting of Ba, Ca, Mg and Sr and B is Ce1???xMx or Zr1???xMx, where x has a value greater than zero and less than one and M is an element selected from the group consisting of Y, Yb, In, Gd, Nd, Eu, Sm and Tb, in combination with (b) an electronic conductor comprising palladium.
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