Thermodynamic potential

Thermodynamic potential ($\Phi$). In the Landau theory of second-order phase transitions the thermodynamic potential takes the form of a power series in the order parameter ($\eta$) (Ref. 1 Eq. 143.1)

$\left.\Phi (P,T,\eta )\right.=\Phi _{0}+\alpha (P,T)\eta +A(P,T)\eta ^{2}+C(P,T)\eta ^{3}+B(P,T)\eta ^{4}+...,$

where P is the pressure and T is the temperature.

See also

• Internal energy (U)
• Helmholtz energy function (A)
• Gibbs energy function (G)
• Enthalpy (H)

References

1. L. D. Landau and E. M. Lifshitz, "Statistical Physics" (Course of Theoretical Physics, Volume 5) 3rd Edition Part 1, Pergamon Press (1980)