Investigation of the Thermal Hysteresis at the Phase Transition of Relaxor Ferroelectric Sr0.61Ba0.39(NbO3)2

Measurements of birefringence and dielectric constant in single crystals of Sr0.61Ba0.39(NbO3)2, evidence a thermal hysteresis (Δ T ≅ 5°C) related to the discontinuous first order ferroelectric transition. The experimental results are analyzed in the light of the effective field approach and compared with the parameters characteristics of a classic perovskite like BaTiO3.

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