Structural phase transitions in brookite-type TiO2 under high pressure

W. Luo, S. F. Yang, Z. C. Wang, Y. Wang, R. Ahuja, B. Johansson, J. Liu, G. T. Zou

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Abstract

We have studied polycrystalline brookite TiO2 using energy-dispersive X-ray diffraction at pressures up to 27.8 GPa and derived an ambient-pressure bulk modulus of 255 GPa using Birch-Murnaghan's equations of state with a fixed value of 4 as its first derivative. The transition from brookite-type to baddeleyite-type was observed to start at 15.8 GPa and finished at 22.8 GPa. Upon decompression, the α-PbO2 structure appeared at 3.5 GPa and the baddeleyite-type structure remained down to 1.6 GPa, the lowest pressure in the present work.

Original languageEnglish (US)
Pages (from-to)49-53
Number of pages5
JournalSolid State Communications
Volume133
Issue number1
DOIs
StatePublished - Jan 1 2005

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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    Luo, W., Yang, S. F., Wang, Z. C., Wang, Y., Ahuja, R., Johansson, B., Liu, J., & Zou, G. T. (2005). Structural phase transitions in brookite-type TiO2 under high pressure. Solid State Communications, 133(1), 49-53. https://doi.org/10.1016/j.ssc.2004.09.049