In situ Phase Transition Study of Nano- and Coarse-Grained TiO2 Under High Pressure/Temperature Conditions

Wang, Y; Zhao, Y; Zhang, J; Xu, h; Wang, L; Luo, S; Daemen, L

doi:10.1088/0953-8984/20/12/125224

Title: In situ Phase Transition Study of Nano- and Coarse-Grained TiO2 Under High Pressure/Temperature Conditions

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Abstract

A comparative phase transition study of nanocrystalline and micro-TiO2 has been conducted under high pressure-temperature (P-T) conditions using energy-dispersive synchrotron x-ray diffraction (XRD). Our study reveals that on compression at room temperature, the micro-tetragonal anatase-type TiO2 started to transform to the orthorhombic columbite-type TiO2 near 1.6 GPa. In contrast, we did not observe this phase transition in nano-anatase at pressures of up to 8.5 GPa. At 8.5 GPa, by applying moderate heat, both samples were transformed completely to columbite-type TiO2 almost simultaneously, indicating that heat treatment could significantly expedite this phase transition. These columbite-type TiO2 phases were quenchable because after cooling them to room temperature and decompressing them to 2.0 GPa, the XRD patterns displayed no changes in comparison with those collected at 8.6 GPa and 1270 K. At 2 GPa, we heated the specimens again, and the rutile-type TiO2 started to emerge around 970 K. This phase was also quenchable after cooling and releasing pressure to ambient conditions. The grain size effects on the phase transition were discussed based on the kinetics mechanism. This study should be of considerable interest to the fields of materials science and condensed matter.

Authors:: Wang, Y; Zhao, Y; Zhang, J; Xu, h; Wang, L; Luo, S; Daemen, L

Publication Date:: Tue Jan 01 00:00:00 EST 2008

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source

Sponsoring Org.:: Doe - Office Of Science

OSTI Identifier:: 959716

Report Number(s):: BNL-82702-2009-JA
Journal ID: ISSN 0953-8984; JCOMEL; TRN: US1005790

DOE Contract Number:: DE-AC02-98CH10886

Resource Type:: Journal Article

Journal Name:: Journal of Physics: Condensed Matter

Additional Journal Information:: Journal Volume: 20; Journal ID: ISSN 0953-8984

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; COMPRESSION; GRAIN SIZE; HEAT TREATMENTS; KINETICS; SYNCHROTRONS; X-RAY DIFFRACTION; TITANIUM OXIDES; GRAIN REFINEMENT; national synchrotron light source

Citation Formats


                    Wang, Y, Zhao, Y, Zhang, J, Xu, h, Wang, L, Luo, S, and Daemen, L. In situ Phase Transition Study of Nano- and Coarse-Grained TiO2 Under High Pressure/Temperature Conditions.  United States: N. p., 2008. 
        Web.  doi:10.1088/0953-8984/20/12/125224.

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                    Wang, Y, Zhao, Y, Zhang, J, Xu, h, Wang, L, Luo, S, & Daemen, L. In situ Phase Transition Study of Nano- and Coarse-Grained TiO2 Under High Pressure/Temperature Conditions.  United States.  https://doi.org/10.1088/0953-8984/20/12/125224

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                    Wang, Y, Zhao, Y, Zhang, J, Xu, h, Wang, L, Luo, S, and Daemen, L. 2008.  
        "In situ Phase Transition Study of Nano- and Coarse-Grained TiO2 Under High Pressure/Temperature Conditions".  United States.  https://doi.org/10.1088/0953-8984/20/12/125224.

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@article{osti_959716,

  title        = {In situ Phase Transition Study of Nano- and Coarse-Grained TiO2 Under High Pressure/Temperature Conditions},

  author       = {Wang, Y and Zhao, Y and Zhang, J and Xu, h and Wang, L and Luo, S and Daemen, L},

  abstractNote = {A comparative phase transition study of nanocrystalline and micro-TiO2 has been conducted under high pressure-temperature (P-T) conditions using energy-dispersive synchrotron x-ray diffraction (XRD). Our study reveals that on compression at room temperature, the micro-tetragonal anatase-type TiO2 started to transform to the orthorhombic columbite-type TiO2 near 1.6 GPa. In contrast, we did not observe this phase transition in nano-anatase at pressures of up to 8.5 GPa. At 8.5 GPa, by applying moderate heat, both samples were transformed completely to columbite-type TiO2 almost simultaneously, indicating that heat treatment could significantly expedite this phase transition. These columbite-type TiO2 phases were quenchable because after cooling them to room temperature and decompressing them to 2.0 GPa, the XRD patterns displayed no changes in comparison with those collected at 8.6 GPa and 1270 K. At 2 GPa, we heated the specimens again, and the rutile-type TiO2 started to emerge around 970 K. This phase was also quenchable after cooling and releasing pressure to ambient conditions. The grain size effects on the phase transition were discussed based on the kinetics mechanism. This study should be of considerable interest to the fields of materials science and condensed matter.},

  doi          = {10.1088/0953-8984/20/12/125224},

  url          = {https://www.osti.gov/biblio/959716},
  journal      = {Journal of Physics: Condensed Matter},

  issn         = {0953-8984},

  number       = ,

  volume       = 20,

  place        = {United States},

  year         = {Tue Jan 01 00:00:00 EST 2008},

  month        = {Tue Jan 01 00:00:00 EST 2008}

}

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