During decommissioning work, in order to determine the amount of radionuclides deposited in a section of iron pipe, you grind up a small section of the pipe into a fine powder to carry out a reaction at 400 0C. Preliminary analysis shows that the predominant iron species are FeO and Fe2O3 Is it safe to use an aluminum crucible for heating your sample? What about a graphite crucible? Provide a short but detailed explanation referencing Ellingham diagrams, calculating Gibbs Free Energy, as well as provide any relevant reactions.