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Data obtained from the grain analysis are represented by solid symbols, and those from the multiphase powder diffraction patterns by crosses. The solid curve represents the fit of a second-order Birch-Murnaghan equation of state (see text). The inset shows the bulk modulus against composition of the three orthorhombic iron oxides h-Fe3O4 (purple), Fe4O5 (red), and Fe5O6 (blue). SD values are smaller than the symbol sizes.
