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Europium (Ⅲ) and niobium (Ⅴ)-codoped TiO2 nanopowders have been synthesized by Ar/O2 radio frequency thermal plasma oxidizing atomized aqueous precursors with various concentrations of Eu3+/(Eu3++Nb5++Ti4+)=0–0.5 at.% and Nb5+/(Eu3++Nb5++Ti4+)=0–1.0 at.%.