Broad Elastic Softening of (Mg,Fe)O Ferropericlase Across the Iron Spin Crossover and a Mixed‐Spin Lower Mantle. - Méndez, A. S. J.; Stackhouse, S.; Trautner, V.; Wang, B.; Satta, N.; Kurnosov, A.; Husband, R. J.; Glazyrin, K.; Liermann, H.‐P.; Marquardt, H. (Journal of Geophysical Research. Solid Earth, 2022)