High-temperature transformation behavior of iron-doped titanium dioxide crystal structures

ABSTRACT

In this research, high-temperature in situ X-ray diffraction were used to study the high-temperature transformation behavior of the iron-doped titanium dioxide (TiO₂). The results show that the phase transformation temperature of TiO₂ from anatase (TiO₂-A) to rutile (TiO₂-R) increased with increasing iron content and that the addition of iron impeded the transformation of titanium dioxide from TiO₂-A to TiO₂-R, which decreased the TiO₂ phase transformation temperature interval. The mechanism is as follows: on the one hand, the incorporation of iron decreases the grain size of both TiO₂-A and TiO₂-R, and refinement of the grains increases the phase transformation temperature; on the other hand, the Fe³⁺ infiltrated into TiO₂ attracts electron cloud of O atoms,causing O atoms to move towards Fe³⁺ during the high-temperature phase transformation, causing the crystal defects in TiO₂ to accelerate the TiO₂-A to TiO₂-R phase transformation reaction and decrease the phase transformation temperature range.

KEYWORDS:

• Iron-doped titanium dioxide
• phase transformation
• high-temperature in situ X-ray diffraction
• crystal defects

Acknowledgements

This work was supported by National Natural Science Foundation of China (51664004); Talent project of Guizhou science and technology cooperation platform ([2017]5788); and the Science and Technology Foundation of Guizhou Province (LH[2015]7657).

Disclosure statement

No potential conflict of interest was reported by the authors .

Additional information

Funding

This work was supported by National Science Foundation of China [grant number 51664004]; Talent project of Guizhou science and technology cooperation platform [grant number [2017]5788]; the Science and Technology Foundation of Guizhou Province [grant number LH[2015]7657].