A Note on the Theory of Barium Titanate

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A careful consideration on lattice vibrations in the ionic ferroelectric crystals such as BaTiO3reveals that a correct physical picture of the ferroelectric transition in these crystals may rather be regarded as an order-disorder transition of orientation of dipoles. A strong local order in the disordered phase is a characteristic feature. The model gives natural interpretation of the occurrence of three successive transitions in BaTiO3, and predicts dielectric dispersion of relaxation type in the paraelectric phase.

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