Heat capacity and thermodynamic properties of nearly stoichiometric wustite from 13 to 450 K

Elaboration and characterization of Fe1–xO thin films sputter deposited from magnetite target

“…The oxygen stoichiometry of the iron oxide depends on temperature and on oxygen partial pressure. For example in the literature it is claimed that bulk FeO can be prepared from a hematite and iron mixture in evacuated and sealed vitreous silica tubes at 1273 K [17,18].…”

Thermodynamic reevaluation of the Fe–O system

“…The major reason for the present reevaluation of the Fe-O system is to take into account the new experimental data for wüstite [9,10] and to introduce a new model for the liquid phase that is based on the Quasichemical Formalism and describes both metal and oxide liquids.…”

“…A different adiabatic calorimeter was used to measure the heat capacity in a narrow temperature range around 700°C [9]. The heat capacity of wüstite of the Fe 0.99 O composition was derived from the adiabatic calorimetry measurements on threephase samples containing Fe and Fe 3 O 4 apart from wüstite [10]. In addition, Coughlin et al [33] measured the heat content from 25 to 1511°C for the same sample that was used by Todd and Bonnickson [32] for the low-temperature experiments.…”

“…Two important studies [9,10] of wüstite by adiabatic calorimetry were published after the thermodynamic assessments mentioned above had been completed. The reported low-and high-temperature heat capacities, standard entropies and enthalpies of formation of wüstite as functions of composition substantially constrained the thermodynamic properties of this phase.…”

On the Crystallographic and Magnetic Structures of Nearly Stoichiometric Iron Monoxide

“…The two-phase mixture of FeO and ing rapidly quenched metastable wü stites. In a second dis-Crystallographic and Magnetic Structures at 298 K proportionation step, the stable two-phase mixture of iron For non-stoichiometric wü stite, the defect clusters conand magnetite is formed (17,19). For this reason, small sisting of vacancies at octahedral sites are situated around amounts of iron may be present in the sample as both the interstitial iron atoms (Fe III ) at tetrahedral sites of the cubic exothermal disproportionation steps necessarily proceed closed packed structure.…”