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Features of domain walls in improper ferroelectrics are theoretically studied on the basis of a simple one dimensional model. The spacial dependence of order parameters within the walls and the wall energy were calculated numerically as the functions of two model parameters. It has turned out that the dependences of antiphase domain wall and ferroelectric domain wall on one of the model parameters are quite different.
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Ishibashi et al. (1976) studied this question.
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