O=O.[O-:3][CH2:4][CH3:5].[Nb+5:6].[O-:7][CH2:8][CH3:9].[O-:10][CH2:11][CH3:12].[O-:13][CH2:14][CH3:15].[O-:16][CH2:17][CH3:18].[C:19]([O:26][CH2:27][CH3:28])(=[O:25])[CH2:20][CH2:21][CH2:22][CH2:23][CH3:24].[Ce:29]>C(O)CCC>[O-:3][CH2:4][CH3:5].[Nb+5:6].[O-:7][CH2:8][CH3:9].[O-:10][CH2:11][CH3:12].[O-:13][CH2:14][CH3:15].[O-:16][CH2:17][CH3:18].[C:19]([O:26][CH2:27][CH3:28])(=[O:25])[CH2:20][CH2:21][CH2:22][CH2:23][CH3:24].[Ce+3:29].[Nb:6]NbxCe1-xO2 where x is from about 0.02 to about 0.05 was prepared by the following procedure. A solution of niobium ethoxide was prepared in n-butanol solvent in a low moisture and low oxygen environment to prevent hydrolysis of the niobium ethoxide with moisture present in the air. A partial solution/emulsion of cerium (III) 2-ethyl hexanoate in n-butanol was prepared. Then, the niobium ethoxide solution is admixed with the cerium 2-ethyl hexanoate solution/emulsion in an amount to provide a desired solid solution of about 2 to 5 mole percent niobium dopant. Then, the solution/emulsion mixture was then dried at about 110° C. in air to begin to transform the gel into powder. Next, the dried material was thermally decomposed by calcination at about 650° C. in air to form the solid solution of metal oxides powder agglomerate. The metal oxide powder was then deagglomerated by high frequency vibration through sonication in a MEK-ethanol solution containing a small amount of fish oil to result in an average particle size powder of about 0.8 microns.
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