The Nature of Dielectric Nonlinearity in the Region of Diffused Phase Transition in Layered Ferroelectric BaBi₂Nb₂O₉

K. Bormanis Institute of Solid State Physics, University of Latvia, Riga, Latvia

A. I. Burkhanov Volgograd State Architectural and Engineering University, Volgograd, Russia

Yu. V. Kochergin Volgograd State Architectural and Engineering University, Volgograd, Russia

V. N. Nesterov Volgograd State Architectural and Engineering University, Volgograd, Russia

A. Kalvane Institute of Solid State Physics, University of Latvia, Riga, Latvia

M. Antonova Institute of Solid State Physics, University of Latvia, Riga, Latvia

A. Sternberg Institute of Solid State Physics, University of Latvia, Riga, Latvia

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Abstract

By studying the dielectric properties of BaBi₂Nb₂O₉ ceramics, a representative of layered ferroelectrics, significant dispersion of ε* has been revealed at low- and infra-low frequences in the region of phase transition. Dispersion of ε* observed in “low-temperature” region (T < T_m) is caused by relaxation of polar formations and their borders. The “high-temperature” dispersion is observed in the region T > T_m where the basic contribution to ε* is provided by processes of the Maxwell-Wagner relaxation.

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The Nature of Dielectric Nonlinearity in the Region of Diffused Phase Transition in Layered Ferroelectric BaBi₂Nb₂O₉

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The Nature of Dielectric Nonlinearity in the Region of Diffused Phase Transition in Layered Ferroelectric BaBi₂Nb₂O₉