Science Advances

Supplementary Materials

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  • fig. S1. Parts of the integrated diffraction images of bridgmanite Mg0.86Fe0.14Al0.04Si0.96O3 (FE14) collected before (lower curve) and during (upper curve) laser heating.
  • fig. S2. Full high-resolution 2D wide-scan x-ray diffraction images of bridgmanite samples FE14, FE17, and FE40.
  • fig. S3. Representative polyhedral structural model of orthorhombic bridgmanite.
  • fig. S4. Backscattered electron image of skiagite starting composition at 23 GPa and 1600°C (run S6151).
  • fig. S5. Typical powder x-ray diffraction patterns of skiagite-majorite garnet that was laser-heated at different pressures and temperatures (St, stishovite; hFe3O4, orthorhombic CaTi2O4-type Fe3O4; Pv, perovskite-structured phase).
  • fig. S6. Crystal structure of Fe4O5 obtained as the product of decomposition of skiagite-majorite garnet in a laser-heated DAC at 39(1) GPa and 2250(100) K (see table S4 for crystallographic data).
  • fig. S7. Variation with pressure of the normalized unit-cell parameters for three bridgmanites—Fe-bridgmanite (this study), (Mg0.96,Fe0.04)SiO3 (32), and Mg0.60Fe0.40Si0.63Al0.37O3 (12).
  • fig. S8. Effect of FeASiO3, FeAAlBO3, and Fe3+,A2/3SiO3 substitutions in bridgmanite on the bulk modulus ("A" and "B" denote structural positions; see table S3 for references).
  • table S1. Crystallographic data for Fe,Al bridgmanite samples FE14, FE17, and FE40 at selected pressures before and after laser heating at different temperatures.
  • table S2. Crystallographic data for (Fe2+0.64(2)Fe3+0.24(2))Si1.00(3)O3 bridgmanite at selected pressures.
  • table S3. Compressibility of bridgmanite with different compositions.
  • table S4. Crystallographic data of Fe4O5.

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