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Raman spectroscopy of CaIrO₃ postperovskite up to 30 GPa

Justin Hustoft^1,*, Sang-Heon Shim^1,, Atsushi Kubo² and Norimasa Nishiyama^2,

¹ Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A.
² Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, U.S.A.

Correspondence: E-mail: sangshim{at}mit.edu

We have measured Raman spectra of the postperovskite (PPv) phase in CaIrO₃ up to 30 GPa to constrain the Grüneisen parameter (). We identified a total of 4 strong modes between 200 and 650 cm^–1, which is in contrast with the Raman spectra of Mn₂O₃ and MgGeO₃-PPv where at least nine different modes have been detected. We found no sign of a phase transition in the Raman spectra of PPv CaIrO₃, which supports the stability of the PPv phase up to 30 GPa and room temperature in CaIrO₃. The spectroscopic Grüneisen parameter, _sp,0 = 1.66~1.72, constrained from our Raman data, is in excellent agreement with the thermodynamic Grüneisen parameter, _th,0 = 1.75 ± 0.05, calculated from recent XRD measurements (Martin et al. 2007) on CaIrO₃-PPv synthesized at high pressure and temperature similar to our starting material. Our result suggests that _sp constrained by Raman measurements provides a reasonable estimate on the _th of the PPv phase in CaIrO₃.

Key Words: Postperovskite • CaIrO₃ • Gruneisen parameter • Raman sepctroscopy • thermal equation of state

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