Single-crystal synchrotron X-ray diffraction study of wüstite and magnesiowüstite at lower-mantle pressures

Single-crystal samples of wüstite-Fe_0.93O and magnesiowüstite-(Mg_0.73Fe_0.27)O were hydrostatically compressed in a diamond-anvil cell to 51 GPa. Equation-of-state parameters for the high-pressure rhombohedral phase of Fe_0.93O were determined.

X-ray emission spectroscopy with a laser-heated diamond anvil cell: a new experimental probe of the spin state of iron in the Earth's interior

X-ray emission spectroscopy and X-ray diffraction have been used in conjunction with the double-sided laser-heated diamond cell technique for studying local electronic spin states of ferrous iron in magnesiowüstite-(Mg_0.75,Fe_0.25)O and its crystal structure under high pressures and temperatures in situ. The new method can be used to study 3d transition metals in oxides and silicates under conditions relevant to deep-Earth and planetary interiors.