The role of Nb addition in TiO2 nanoparticles: phase transition and photocatalytic properties - Silva, Luís F. da; Avansi Jr, Waldir; Catto, Ariadne C.; Rodrigues, João E. F. S.; Bernardi, Maria Inês Basso; Mastelaro, Valmor Roberto (Physica Status Solid A, 2018)