Thermal Characterization of Co-Doped TIO2 Nanopowders Obtained by a Hydrothermal Procedure (original) (raw)

Metalurgia international

Abstract

Nanopowders based on Co-doped TiO2 anatase with homogeneous distribution of doping element were obtained by a hydrothermal process using KOH as mineralizing agent. The microstructure analysis made by RXD and SEM show the formation of nanopowders with single phase anatase structure. The stability and phase evolution of crystallized TiO2 during thermal treatment vs. Co content was studied using DSC-TG methods. The estimation of activation energy for hydrothermal crystallization was done based on XRD measurement of nanopowders obtained at different temperatures and times based on Avrami approach. The results show that Co - doped anatase nanopowders obtained by the proposed hydrothermal procedure show a good stability for potential applications in photo-catalytic processes and diluted magnetic semiconductors:

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