| http://www.w3.org/ns/prov#value | - (II) Oxides of the general formula MyM???1???yOx, wherein at least one M element is different than at least one M??? element, wherein M is selected from Ba, Ce, Nb, Sm, Sr, and mixtures thereof, M??? is selected from Ti, Y, Sm, Nb and mixtures thereof, and wherein 0???y???1 and x is a number sufficient to satisfy the valence requirements of the other elements;
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