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FIGURE 4. Raman spectra of the two samples at the pressures of 95 and 115 GPa. The Raman spectra were collected right after the diffraction experiment without changing pressure or additional heating. Both spectra are dominated by Raman peaks above 700 cm^–1 where perovskite does not have measurable Raman scattering intensity (Serghiou et al. 1998; Karki et al. 2002). These strong features are not single broad peaks but are composed of several overlapping peaks which appear as shoulders in the spectra, in particular in the spectrum of Sample 1 (lower spectrum). The lower frequency part of the spectrum is complex and involves more Raman peaks than expected for the CaIrO₃-type structure (see text). Sample 1 (lower spectrum) exhibits marked texture (Fig. 2b) and the observed Raman peak intensities are not expected to represent an average. The upper spectrum (Sample 2) is from a powdered sample.

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