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Full thermal decomposition of metal oxides?

  1. May 14, 2017 #1
    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!
     
  2. jcsd
  3. May 15, 2017 #2
    Check Ellingham diagrams. They provide temperature-oxygen partial pressured regimes for metal oxides. Iron oxides are well-studied. So surely you will find the needed data.

    Direct computations, requires full electronic structure calculations coupled with finite temperature effects. I think there was a paper in Phys. Rev. B journal on this calculation for iron oxide. I can try googling it if you are interested.
     
  4. May 15, 2017 #3
    Whoops misclicked there. Yeah if you could point me in the right direction for those I would appreciate it. I did look at some of the Ellingham diagrams before but was not too sure about the iron oxides because they seem to run off most of the charts. I will further investigate the paper as well.
     
  5. May 15, 2017 #4
    This Ellingham diagram contains all the decompositions of iron oxides starting from Fe2O3 through Fe3O4, FeO, and eventually to Fe.

    http://web.mit.edu/2.813/www/readings/Ellingham_diagrams.pdf

    The paper I mentioned cared more about the transitions in the PO2-PH2O space with little regard to temperature, but it may still be useful:
    https://journals.aps.org/prb/abstract/10.1103/PhysRevB.83.094112

    An arxiv version of the paper is here:
    https://arxiv.org/pdf/1101.3105.pdf


    The key thing is that the decomposition depends on both temperature and oxygen partial pressure. I hope this helps.
     
  6. May 15, 2017 #5
    Thank you very much for this! This helps a bunch!
     
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