Oxygen fugacity dependence of Ni, Co, Mn, Cr, V, and Si partitioning between liquid metal and magnesiowüstite at 9–18 GPa and 2200°C

Partitioning experiments in the laser-heated diamond anvil cell: volatile content in the Earth's core

“…However recent LHDAC experiments (Bouhifd & Jephcoat 2003) with compared multi-anvil data (e.g. Li & Agee 1996;Gessmann et al 1999;Chabot et al 2005) show good agreement between the partition coefficients obtained with both techniques. The maximum temperature limit of the multianvil apparatus is near 3000 K (Ito 2007), whereas the LHDAC can in principle raise sample temperatures in direct proportion to a homologous temperature (required as the magma ocean deepens), and is the subject of §2.…”

Si in the core? New high-pressure and high-temperature experimental data

“…From reaction 2 and Eqn. 5, the theoretical slope of a diagram that represents log(X Simetal ) vs. log f O 2 (relative to IW) can be deduced (e.g., Gessmann et al, 1999Gessmann et al, , 2001. It should be Ϫ1 if the valence of Si is 4ϩ and if Henry's law or Raoult's law applies.…”

“…All the multianvil press investigations carried out to measure silicon incorporation in metal between 5 and 27 GPa (e.g., Ito and Katsura, 1991;Ito et al, 1995;Gessmann and Rubie, 1998;Gessmann et al, 1999Gessmann et al, , 2001O'Neill et al, 1998) potentially suffer from problems with chemical equilibrium. These difficulties are intrinsic to the configuration of high-pressure and high-temperature experiments in multianvil press.…”

Melting of the Indarch meteorite (EH4 chondrite) at 1GPa and variable oxygen fugacity: Implications for early planetary differentiation processes

“…The range of oxygen fugacities resulting from addition of Si is described in more detail in Sections 3.2 and 3.3. The viability of this approach has been demonstrated by Gessmann et al (1999), Malavergne et al (2004), Rubie (1999), and Siebert et al (2004), for example, who obtained oxygen fugacities in their experiments between IWÀ3 and IWÀ6.…”