Defect Clustering and Ordering in Zn-Doped TiO₂ upon Solution Annealing

Abstract

TiO2−ZnO powders in a molar ratio of 92:8 were subject to solution annealing via a reactive sintering route prior to X-ray diffraction and transmission electron microscopic studies. Charge-compensating defect clusters and planar faults predominantly parallel to (121) and (132) planes, analogous to the crystallographic shear of nonstoichiometric Ti n O2n−1 with specific extent of oxygen vacancies, were formed in the Zn-doped TiO2 of the rutile-type structure when quenched from 1300 °C in air. Upon annealing at 900 °C, an additional phase with 3x(101) commensurate superstructure was formed by an ordering process and Guinier−Preston zones parallel to (100) and (010) were exsolved via anisotropic lattice diffusion.

Synthesis and photocatalytic applications of nano-sized zinc-doped mesoporous titanium oxide

“…In this context, we have improved the synthesis of Zn-doped titanium oxide by the modification of our cheap and simple synthetic method for the preparation of mesoporous TiO 2 by including a cheap Zn source (Zn(NO 3 ) 2 ) for the preparation of zinc-doped nano-sized (with particle sizes from 10 to 20 nm) mesoporous titanium oxide. This method reported here is much easier, cheaper and more efficient than those described previously in the literature [17,18,[20][21][22][23][24][25][26][27][28][29][30][31] and comparable (in terms of price and difficulty) to that described by Fu et al [19].…”

“…Only the research group of Li et al [17,18] has reported the preparation of zinc ions surface-doped titanium dioxide nanoparticles and nanotubes via an assembly process based on ligand exchange reaction with [Zn(acac) 2 ] (acac = acetylacetonate) and with an additional thermal treatment. In addition, Fu et al [19] reported a very simple method for the doping with Zn, while some other groups have reported the zincdoping using different difficult synthetic methods [20][21][22][23][24][25][26][27][28][29][30][31]. In this context, we have improved the synthesis of Zn-doped titanium oxide by the modification of our cheap and simple synthetic method for the preparation of mesoporous TiO 2 by including a cheap Zn source (Zn(NO 3 ) 2 ) for the preparation of zinc-doped nano-sized (with particle sizes from 10 to 20 nm) mesoporous titanium oxide.…”

(hkil)-specific G.P. zones in Sn- versus Zr-doped α-Al2O3 by solution annealing

“…The TiO 2 rutile doped with Zr 4+ [2] or Zn 2+ [3], however, showed (1 0 0) and (0 1 0)-specific Guinier-Preston (G.P.) zone plates besides other planar defects and commensurate superstructures when solution annealed.…”

“…In the case of Zr 4+ -doped TiO 2 , incommensurate as well as commensurate superstructures with triple (1 0 1) and (1 1 1) periodicity also occurred as metastable intermediates [2]. As for the case of Zn 2+ -doped TiO 2 , a rather limited solid solution and exsolution of the aliovalent cation Zn 2+ typically caused the formation of crystallographic shear (CS) [3]. The resultant CS slip planes turned out to be similar to those of undoped Ti n O 2nÀ1 , thus shedding light on the concentration of charge-compensating oxygen vacancies in Zn 2+ -doped TiO 2 [3].…”

Effect of Zn Doping on the Photocatalytic Activity of TiO₂

“…， C [11] ， N [12] ， P [13] ， S [14] 和金属离子掺杂 Ag [15] ， Mn [16] ， Fe [17] ， Nb [18,19] ， 和 Zn [20][21][22] …”