This PDF file includes:

• Fig. S1. Diffraction image (A) and integrated pattern (B) collected during synthesis (~15 GPa, ~2000 K).
• Fig. S2. Diffraction image (A) and integrated pattern (B) collected at 10.7 GPa where Fe₅O₆, wüstite, neon, and gold were the phases identified.
• Fig. S3. Diffraction image (A) and integrated pattern (B) collected at ~11 GPa where Fe₅O₆, Fe₄O₅, and neon were the phases identified.
• Fig. S4. Comparison of the axial compressibility of Fe₅O₆ and Fe₄O₅.
• Fig. S5. Volume (A) and relative compressibility (B) of the orthorhombic iron oxides.
• Table S1. Example of cell parameter fitting results from powder diffraction analysis.
• References (32–34)

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