Author/Authors :
Luo، نويسنده , , W. and Yang، نويسنده , , S.F. and Wang، نويسنده , , Z.C. and Wang، نويسنده , , Y. R. Ahuja، نويسنده , , R. O. Johansson، نويسنده , , B. and Liu، نويسنده , , J. and Zou، نويسنده , , G.T.، نويسنده ,
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–Murnaghanʹs 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.
Keywords :
A. Brookite-type TiO2 , D. Bulk modulus , D. Structure transition , E. High pressure
