Thermodynamic Modeling of High‐Temperature Fe‐Ni‐Heazlewoodite

The thermodynamic modeling of key sub‐systems as the iron‐nickel‐sulfur system is a contribution to the development of extended databases for multicomponent metal‐sulfur systems. A further extension of a recent thermodynamic modeling of the Fe‐Ni‐S system is presented. A two‐sublattice approach in the framework of the Compound Energy Formalism is used for a consistent integration of a second ternary high–temperature heazlewoodite phase within a complete thermodynamic description of the Fe‐Ni‐S system.