Latent Heat of Phase Transition: Origin & Explanation

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SUMMARY

The discussion centers on the latent heat of phase transitions, specifically the latent heat of a first-order solid-solid polymorphic pressure-induced phase transition between two solid allotropes. It is established that this latent heat corresponds to the difference in energy of the bonds in the two solid phases involved in the transition. Additionally, contributions from phonons are acknowledged, which can be estimated using the Debye model, reflecting changes in the material's stiffness during the transition.

PREREQUISITES
  • Understanding of latent heat concepts
  • Familiarity with solid-solid phase transitions
  • Knowledge of intermolecular bonding in solids
  • Basic principles of the Debye model in solid-state physics
NEXT STEPS
  • Research the Debye model for estimating phonon contributions in phase transitions
  • Study the thermodynamics of first-order phase transitions
  • Explore the properties of different solid allotropes and their bonding characteristics
  • Investigate the impact of pressure on solid-state phase transitions
USEFUL FOR

Physicists, materials scientists, and researchers studying phase transitions in solids, particularly those interested in the thermodynamic properties of allotropes and their behavior under varying conditions.

g_mogni
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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
 
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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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