Iron disproportionation in majorite-bearing rocks of the Earth's transition zone and in Mars' deep mantle

Robert Myhill, University of Bristol, School of Earth Sciences, Bristol, United Kingdom, Christopher Beyer, Catherine A McCammon, University of Bayreuth, Bayerisches Geoinstitut, Bayreuth, Germany and Katharina Marquardt, GeoForschungsZentrum Potsdam, Potsdam, Germany