Spin Transitions in Ferropericlase under High Pressure: Comparison of Mossbauer-Spectroscopy and X-Ray Emission-Spectroscopy Data

摘要

Ferropericlase (Mg_(1-x),Fe_x)O, where x - 0.2, is thought of as one of the basic minerals forming the lower Earth mantle. Properties of ferropericlase at high pressures and temperatures are of great interest for Earth science. Variations of spin states of iron in ferropericlase can result in a change of density, compressibility, thermal and electrical conductivity, and other extremely important physical characteristics of the lower mantle. By virtue of these reasons, the knowledge of the iron spin state in ferropericlase and parameters of the spin transition is urgent for understanding the structure and properties of the lower Earth mantle.