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Origin of latent heat

  1. Feb 25, 2016 #1
    Hello,

    We often hear about latent heat of vaporisation for a liquid, which basically corresponds to the energy required to break the hydrogen inter-molecular bonds in the liquid phase to form the gas. I was wondering, what is the equivalent physical explanation for the latent heat of a first-order solid-solid polymorphic pressure-induced phase transition between two solid phases (allotropes) of a crystal? Does it correspond to the difference in energy of the bonds in the two solid phases involved in the phase transition?

    Many thanks,


    Gabriele
     
  2. jcsd
  3. Feb 26, 2016 #2

    DrDu

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    Science Advisor

    Yes. Beside this I would expect a contribution from the phonons. This may be estimated using the Debye model. It will reflect the change in stiffness of the material
     
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