Phase diagrams near the Lifshitz point. I. Uniaxial magnetization

A paramagnetic (I)-ferromagnetic (II)-sinusoidal (III) phase diagram near a Lifshitz point is studied for the case of uniaxial magnetization. The shape of the phase diagram in the vicinity of this point is determined. It is found that the II ⇄ III phase transition line is tangent to the order-disorder (I ⇄ II and I ⇄ III) transition line at the Lifshitz point. The II ⇄ III phase transition is shown to be first order, with latent heat and metastability regions. The behavior of magnetic susceptibility is determined. Binary alloy systems are suggested in which the considered type of phase diagram may be expected.