DFliyerz
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Iron Oxide + Iron Thermite?
This is probably a really dumb question, but... couldn't, in theory, a thermite mixture of iron oxide as the oxidizer and iron powder as the fuel
work, and make an oscillating reaction in which the iron powder is converted to iron oxide and the iron oxide is converted to iron, therefore
repeating the reaction, albeit at a slightly smaller scale?
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Bert
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Thread Moved
4-1-2015 at 16:14 |
Molecular Manipulations
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Possibly if you use a high oxidation state of iron and have the result be a lower oxidation state, but other wise obviously not.
Fe2O3 + Fe ↔ 3 FeO I could calculate this and find if it's ΔG is -, but I doubt it.
Wiki says iron exsists in the +5 and +6 oxidation states, but I can't find any oxide of it in either of those states.
No. An oscillating reaction would never happen. If you mantained the mixture at iron's melting point, you would get an equilibrium, but it would
obviously release no energy.
[Edited on 5-1-2015 by Molecular Manipulations]
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gdflp
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I doubt that would work. Iron does exist in the +6 oxidation state, but only as ferrates. And, since the reaction is not thermodynamically
favorable, not much would happen unless the reaction mixture was heated to a very high temperature. As MM said, you would never get an oscillating
reaction.
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DFliyerz
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Quote: Originally posted by Molecular Manipulations  | Possibly if you use a very high oxidation state of iron, but other wise obvously not.
Wiki says iron exsists in the +5 and +6 oxidation states, but I can't find any oxide of it in either of those states.
No. An oscillating reaction would never happen. If you mantained the mixture at iron's melting point, you would get an equilibrium, but it would
obvously release no energy. |
Wikipedia doesn't have any compound for a +5 oxidation state, but it does have a fairly easy to synthesize +6 oxidation state compound: potassium
ferrate.
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Molecular Manipulations
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Yes, but that's technically not an oxide. So yeah, that would work, but you might as well use any other oxidizer. Like the potassium nitrate
you would need to make the potassium ferrate.
[Edited on 5-1-2015 by Molecular Manipulations]
-The manipulator
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DFliyerz
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What about barium ferrate?
EDIT: I just realized that I'm looking at this wrong.
[Edited on 1-5-2015 by DFliyerz]
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DFliyerz
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Actually, couldn't a +5 or +6 oxide of iron be produced with ozone or another allotrope of oxygen?
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macckone
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You need to look at the thermodynamics of the compounds.
Aluminum Oxide produces a lot of energy when it is formed.
Iron oxides don't produce nearly as much energy.
Magnesium can be used instead of aluminum.
Other mixes are possible.
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blogfast25
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| Quote: Originally posted by DFliyerz | | This is probably a really dumb question, but... couldn't, in theory, a thermite mixture of iron oxide as the oxidizer and iron powder as the fuel
work, and make an oscillating reaction in which the iron powder is converted to iron oxide and the iron oxide is converted to iron, therefore
repeating the reaction, albeit at a slightly smaller scale? |
Erm.... NOOO!
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DraconicAcid
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That's kinda like asking, "If I put a ball on a flat surface, will it roll back and forth really fast?"
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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DFliyerz
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Now that the fact that an oscillating thermite reaction wouldn't work has been hammered in, I have a better hypothesis that's been keeping me awake at
night: the creation of a +5 or +6 oxidation state iron oxide with ozone or another allotrope of oxygen.
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Molecular Manipulations
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Did you search?
I doubt oxygen will do that. Is ozone really easier for you to get than potassium nitrate?
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DFliyerz
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What if I want to try and make a higher oxide of iron? 
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blogfast25
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There are no stable oxides of Fe above oxidation state III. 'FeO<sub>3</sub>' can exist in very alkaline solution as ferrate anions,
FeO<sub>4</sub><sup>2-</sup> but cannot be isolated from it: it immediately falls apart to ferric oxide and oxygen.
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