Spin crossover equation of state and sound velocities of (Mg0.65Fe0.35)O ferropericlase to 140 GPa
作者： Bin Chen , Jennifer M. Jackson , Wolfgang Sturhahn , Dongzhou Zhang , Jiyong Zhao
DOI: 10.1029/2012JB009162
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摘要: to the full P-V data set, resulting in a zero-pressure volume V0 = 77.24 � 0.17 A 3 , bulk modulus K0 159 8 GPa and its pressure-derivative K′0 4.12 0.42 for high-spin FP35 K0,LS 72.9 1.3 182 17 with K′0,LS fixed 4 low-spin FP35. The transition occurs at 64 GPa. Using spin crossover EOS Debye sound velocity, we derived shear (VS) compressional (VP) velocities Comparing our previous results on (Mg,Fe)O similar pressures, find that addition of iron decreases both VP VS, while elevating their ratio (VP/VS). Small amounts (<10%) mixed silicates could explain moderate reductions wave speeds near core mantle boundary (CMB), larger amount CMB would not allow large structure maintain neutral buoyancy.
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