Landau相变中的自由能

摘要

Landau用序参量的幂级数展开来表示相变温度附近的自由能，强调对称性与序参量在相变中的作用。正确书写自由能形式，可以计算可能相的温度曲线，得到关于序参量的方程，从而推知系统的结构。%From Landau theory,free energy near the phase transition temperature should be ex-panded in a power series of the order parameter.The functions of symmetry and order parameter are emphasized.We can get the equation of order parameter,and know the relation of phase tran-sition temperature and order parameter,and study the structures of crystals.