Domain wall solutions for EHM model of crystal: structures with period multiple of four

For a one-dimensional discrete model of a crystal the form of a moving doma in wall in the structure with period multiple of four was derived in the co nstant amplitude approximation. The energy of the carrying commensurate str ucture, the width and the energy of the domain wall were expressed in terms of the amplitudes of Fourier harmonics of the carrying commensurate struct ure. With the use of the result by Ishibashi, the relation between differen t solutions was established. The applicability and the accuracy of the solu tions were tested by comparing them with the numerically obtained exact sol utions. (C) 2000 Elsevier Science B.V. All rights reserved.