Abstract
An electronic transition of iron in magnesiowustite has been studied with synchrotron Mössbauer and x-ray emission spectroscopies under high pressures. Synchrotron Mössbauer studies show that the quadrupole splitting disappears and the isomer shift drops significantly across the spin-paring transition of iron in between 52 and . Based upon current results and percolation theory, we reexamine the high-pressure phase diagram of and find that iron-iron exchange interaction plays an important role in stabilizing the high-spin state of iron in -rich .
- Received 30 January 2006
DOI:https://doi.org/10.1103/PhysRevB.73.113107
©2006 American Physical Society