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(Top) High pressure diffraction patterns for , , and at similar pressures. (Bottom) The diffraction patterns of with cubic , Monoclinic and structurally disordered phases. The LeBail refinement showing the calculated line, difference line and phase markers at 71 GPa is also depicted for the monoclinic phase. The arrows indicate the monoclinic splitting.
Pressure vs volume plot for the Tb pyrochlore oxides. Regions of purely amorphous state are indicated by shading. The continuous lines correspond to fits using the Birch-Murnaghan equation of state. The inset shows variation of the parameter of the oxygen as a function of pressure.
Raman spectra of at ambient pressure and at 60 GPa. The bending modes are at and stretching modes are at .
Structural parameters and bulk modulus for Tb-pyrochlore oxides. —transition pressure to the disordered state.
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