Abstract
In a previous paper [M. Matsushita and T. Ohta: J. Phys. Soc. Jpn. 67 (1998) 1973], the model equation for a structural phase transition between a hexagonal symmetry and a square symmetry has been introduced and numerical simulations have been carried in two dimensions where the order parameter is a non-conserved quantity. In the present paper, we extend the model equation for the conserved order parameter. The thermal random force is also taken into account. The kinetics of the structural transition is studied by analyzing the non-equilibrium scattering function of the domain structures and by evaluating the time-dependence of the volume fraction of one of the structures. The equilibrium phase diagram for domain structures is also derived by means of the single wave number approximation.
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