Electronic structure of iron in magnesium silicate glasses at high pressure

摘要: [1] A recent study attributed the source of an iron partitioning change between silicate melt and minerals at deep mantle conditions to a high-spin low-spin in iron, which was found Fe-diluted Mg-silicate glass similar pressure. We conducted X-ray emission spectroscopy nuclear forward scattering on iron-rich glasses high pressure 300 K diamond-anvil cell: Al-free up 135 GPa Al-bearing 93 GPa. In both glasses, spin moment decreases gradually from 1 bar does not reach complete state even peak pressures this study. The gradual may be due existence diverse coordination environments for continuous structural adjustment disordered system with If result can extrapolated melts, small, changes dominant factor explaining reported sudden behavior lower-mantle pressures.