The sound velocities of (Mg. 16Fe. 84) O have been measured to 121 GPa at ambient
temperature using nuclear resonant inelastic x‐ray scattering. The effect of electronic …

The discovery of a pressure induced iron-related spin crossover in Mg (1-x) Fe x O
ferropericlase (Fp) and Mg-silicate perovskite, the major phases of Earth's lower mantle, has …

We explore the effect of Mg/Fe substitution on the sound velocities of iron‐rich (Mg1− xFex)
O, where x= 0.84, 0.94, and 1.0. Sound velocities were determined using nuclear resonance …

Deciphering the origin of seismic velocity heterogeneities in the mantle is crucial to
understanding internal structures and processes at work in the Earth. The spin crossover in …

Iron-bearing periclase is thought to represent a significant fraction of Earth's lower mantle.
However, the concentration of iron in (Mg, Fe) O is not well constrained at all mantle depths …

We have determined the elastic and vibrational properties of periclase‐structured (Mg0.
65Fe0. 35) O (“FP35”), a composition representative of deep mantle “pyrolite” or chondrite …

Using synchrotron‐based X‐ray diffraction, we explore characteristic signatures for
nonhydrostatic stresses and their effect on the spin state crossover of ferrous iron in (Mg, Fe) …

The iron spin crossover in (Mg1‐xFex) O ferropericlase causes changes to its physical
properties that are expected to affect seismic velocities in Earth's lower mantle. We present …

Acoustic dissipation due to structural phase transitions in minerals could give rise to large
seismic attenuation effects superimposed on the high temperature background contribution …

Both seismic observations of dense low shear velocity regions and models of magma ocean
crystallization and mantle dynamics support enrichment of iron in Earth's lowermost mantle …