High Temp γ-Fe Enthalpy > Low Temp α-Fe Enthalpy: Why?

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Why is the enthalpy of γ-Fe at high temperatures higher than the enthalpy of α-Fe at low temperatures?
Why is the enthalpy of γ-Fe at high temperatures higher than the enthalpy of α-Fe at low temperatures?
 
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What have you found in your searching so far about this question? Also, is this for schoolwork?
 
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