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As increasing applications of the ferroelectric ceramics in the field of engineering, how to predict their effective electroelastic properties and improve the reliability of their structure becomes more and more important. As we all know, below the Curie temperature, the ferrolectric ceramics have special microstructure domain and one grain may be composed of many domains. Under the action of external field, the particular domain switching, which has two types of mechanism nucleation and domain wall moti...