The solution model developed in Hirschmann (1991) resulted in small to moderate negative deviations from Raoult’s law for minor amounts of Ni in ternary Mg-Fe-Ni olivine; i.e., the activity coefficient of the liebenbergite component (NiSi0.5O2) in Mg-Fe-Ni olivine (γNi) was predicted to be <1. Revised solution parameters in Hirschmann (1992) reaffirmed the small to moderate negative deviations for minor Ni in Mg-rich olivine but yielded moderate positive deviations from Raoult’s law for Fe-rich olivine.

These results contradicted Fleet (1989), who derived γNi by equilibrating Mg-Fe-Ni olivine with (Fe,Ni)S liquid at defined f...

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