Diffenent between binding energy and formation energy

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SUMMARY

The discussion clarifies the distinction between binding energy and formation energy in the context of defects in solids. Formation energy refers to the energy required to create isolated defects, such as vacancies or defect clusters, and is crucial for determining defect concentration. In contrast, binding energy pertains to defect complexes, measuring their thermodynamic stability against dissociation. A defect complex is stable if its binding energy indicates a favorable thermodynamic state under equilibrium conditions.

PREREQUISITES
  • Understanding of solid-state physics concepts, particularly defects in solids.
  • Familiarity with thermodynamic principles related to energy states.
  • Knowledge of energy concepts such as binding energy and formation energy.
  • Basic grasp of equilibrium conditions in physical systems.
NEXT STEPS
  • Research the role of formation energy in defect concentration in materials science.
  • Study binding energy calculations for defect complexes in solid-state physics.
  • Explore thermodynamic stability criteria for defect formations in crystalline materials.
  • Investigate examples of defect complexes and their implications in material properties.
USEFUL FOR

Students and researchers in materials science, solid-state physicists, and anyone interested in the thermodynamic properties of defects in solids.

kaypu
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Dear friend:

i'm a fresh man, some concepts puzzle me. As the title says, can anybody tell me what's the different between the binding energy and formation energy?

Regards
 
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I will take defects in solids as an example (although other examples are applicable). The formation energy applies to isolated non-composite (for example isolated vacancy) defects as well as to defect clusters or (complex or composite , name it as you wish, but as an example the complex formed between three vacancies ). This formation energy expresses the energy penalty that has to be paid in order to form the defect. Thus, it is the quantity that determines the concentration of a particular defect.

The binding energy is applicable to defect complexes. It is a measure for the thermodynamic stability of the complex against dissociation into its constituents. The complex whose binding energy is such that it is not stable thermodynamically (-ve or +ve depending on the sign convention you wish) should not form under equilibrium conditions.
 
Thank you so much
 

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