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We have measured Raman spectra of the postperovskite (PPv) phase in CaIrO 3  up to 30 GPa to constrain the Grüneisen parameter (γ). We identified a total of 4 strong modes between 200 and 650 cm -1 , which is in contrast with the Raman spectra of Mn 2 O 3  and MgGeO 3 -PPv where at least nine different modes have been detected. We found no sign of a phase transition in the Raman spectra of PPv CaIrO 3 , which supports the stability of the PPv phase up to 30 GPa and room temperature in CaIrO 3 . The spectroscopic Grüneisen parameter, γ sp,0  = 1.66~1.72, constrained from our Raman data, is in excellent agreement with the thermodynamic Grüneisen parameter, γ th,0  = 1.75 ± 0.05, calculated from recent XRD measurements (Martin et al. 2007) on CaIrO 3 -PPv synthesized at high pressure and temperature similar to our starting material. Our result suggests that γ sp  constrained by Raman measurements provides a reasonable estimate on the γ th  of the PPv phase in CaIrO 3 .

Raman spectroscopy of CaIrO 3 postperovskite up to 30 GPa