Studies on structural and electrical properties of ZnO/TiO 2 composite materials

Structural, electric modulus and complex impedance analysis of ZnO/TiO2 composite ceramics

“…By comparing the Nyquist plots at the same temperature, it was noted that the resistance value increased significantly with the TiO 2 content. This behavior was correlated with the electrical conductivity, which the lowest value of σ dc obtained for the 7 wt% of TiO 2 content . Moreover, the electrical circuit equivalent obtained from the pellet to which 7 wt% of TiO 2 content was added presented fewer components of resistance and capacities than the other pellets.…”

“…For the doping content 1 wt%, E a value is equal to 0.5 eV that is very near to 0.54 eV, which emanates from the state charge of interstitial oxygen . For the TiO 2 content of 3 wt%, the value E a =0.19 eV corresponds to the states of electron traps generated by oxygen chemisorptions at grain boundaries . In addition, the doped ZnO with 5 wt% TiO 2 has an activation energy very near to 0.1 eV, which is assigned to neutral (O i + ) positively charged oxygen interstitial (O i 1+ ) .…”

“…This behavior was correlated with the electrical conductivity, which the lowest value of r dc obtained for the 7 wt% of TiO 2 content. 54 Moreover, the electrical circuit equivalent obtained from the pellet to which 7 wt% of TiO 2 content was added presented fewer components of resistance and capacities than the other pellets. This result indicated the reduction of carriers when the TiO 2 content attains 7 wt% and confirmed the fast increase in the resistance value with the TiO 2 content.…”

“…52,53 For the TiO 2 content of 3 wt%, the value E a =0.19 eV corresponds to the states of electron traps generated by oxygen chemisorptions at grain boundaries. 54 In addition, the doped ZnO with 5 wt% TiO 2 has an activation energy very near to 0.1 eV, which is assigned to neutral (O i + ) positively charged oxygen interstitial (O i 1+ ). 53 However, for the 7 wt% TiO 2 content, E a value is about 0.36 eV, which is related to the oxygen vacancy.…”

Effect of phase transformation on optical and dielectric properties of pulsed laser deposited ZnTiO3 thin films

“…ZnO and TiO 2 have attracted much interest on either single material [5,6] or ZnOeTiO 2 composites [7,8]. Dulin and Rase [9] reported that three compounds exist in the ZnOeTiO 2 system, including ZnTiO 3 (hexagonal and cubic), Zn 2 TiO 4 (cubic), and Zn 2 Ti 3 O 8 (cubic).…”