STUDY ON THE EFFECTS OF DOPED NITROGEN CONCENTRATION TO CRYSTALLINE PHASE TRANSITION OF N-TiO2

Abstract

      The crystalline phase transition of N-TiO2 which is prepared from TiCl4 and NH3 were investigated. The XRD method showed that, there was the process of phase transition from rutile to anatase phase and amorphous phase when the molar ratio NH3/TiCl4 increases of from 0 to 4.20. The process of reverse phase transition from amorphous to anatase phase and rutile phase was obtained when the concentration of doped nitrogen reduced from 4.51 to 0% atom. The combination of XRD and XPS methods showed that, the change of binding energy of N1s, Ti2g, O1s and lattice parameters of the N-TiO2 corresponding the change of doped nitrogen concentration was noted. Thus, change the concentration of doped nitrogen make distorted TiO6 octahedral, altering the condensation type between of them and was direct cause leading to the phase transformation of N-TiO2.

Keywords: binding energy of N1s, Ti2g, O1s; the phase transition of N-TiO2