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- W2993641569 abstract "Abstract Needle domains are thin, lamellar domains that can appear as fine lines or stripes in a ferroelectric crystal . They affect the poling, switching, and other properties of ferroelectrics. A model is established to study the stress and electric fields caused by needle domains and their interaction. Considering the electrical and mechanical compatibility conditions at the tip of a needle domain, the fields are represented using equivalent edge dislocations and line charges. Accordingly, the dislocation fields derived by Barnett and Lothe for anisotropic piezoelectric media are employed. A modified Peach–Koehler force and calculations of the total energy due to the needle domains are used to study the formation, interaction and stability of needle patterns, taking full account of the strong anisotropy and electromechanical coupling present. The interaction of pairs of needle domains in an infinite piezoelectric with properties of barium titanate is found to be dominated by the electrostatic terms. This makes comb-like arrays of needle domains unstable if perfectly insulating properties are assumed. By considering redistribution of charge, stable equilibrium states for arrays of needle domains are found; these agree well with experimental observations. The model explains the stability of various observed needle patterns and also how unstable patterns evolve." @default.
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- W2993641569 date "2020-03-01" @default.
- W2993641569 modified "2023-09-24" @default.
- W2993641569 title "Modelling and interaction of needle domains in barium titanate single crystals" @default.
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- W2993641569 doi "https://doi.org/10.1016/j.euromechsol.2019.103919" @default.
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