I haven't been able to find much information on the thermal decomposition of metal oxides into their corresponding metals and oxygen. What temperature would Fe3O4 decompose mostly(80%) into its base elements? Additionally, how can this information be determined based upon bond energies/structures for other elements? For those who are curious, I am looking into methods for producing metals thermally for use where reducers such as carbon are not present in high enough concentrations to be useful. Thanks!