Dielectric response to low and infra-low frequency in layered ferroelectrics

Karlis Bormanis; Vladimir N. Nesterov; Anver I. Burkhanov; Yuriy V. Kochergin; Maruta Dambekalne; Anna Kalvane

doi:10.1117/12.726554

25 January 2007 Dielectric response to low and infra-low frequency in layered ferroelectrics

Karlis Bormanis, Vladimir N. Nesterov, Anver I. Burkhanov, Yuriy V. Kochergin, Maruta Dambekalne, Anna Kalvane

Proceedings Volume 6596, Advanced Optical Materials, Technologies, and Devices; 65961K (2007) https://doi.org/10.1117/12.726554
Event: Advanced Optical Materials, Technologies, and Devices, 2006, Vilnius, Lithuania

Abstract

Features of dielectric response to frequencies in the 0.25.1000 Hz range in ceramic samples of BaBi₂Nb₂O₉, Na_0,5Bi_8.5Ti₂Nb₄O₂₇, Na₀_,5Bi_8.5Ti₂Ta₄O₂₇, and K_0,5Bi_8.5Ti₂Nb₄O₂₇ compounds are reported. Considerable relaxation of &egr;'(T) and &egr;"(T) maximums has been observed at all frequencies in BaBi₂Nb₂O₉. Na_0,5Bi_8.5Ti₂Nb₄O₂₇ and Na_0,5Bi_8.5Ti₂Ta₄O₂₇ are characterised by broad maximums on &egr;'(T) at frequencies below 100 Hz and a weak anomaly in K_0,5Bi_8.5Ti₂Nb₄O₂₇ at temperatures well below the paraelectric phase transition. Increasing values of &egr;' are observed at low temperatures in compounds containing sodium. The observed features of dielectric response are explained by largescale charge fluctuations in layered ferroelectrics.

Citation Download Citation

Karlis Bormanis, Vladimir N. Nesterov, Anver I. Burkhanov, Yuriy V. Kochergin, Maruta Dambekalne, and Anna Kalvane "Dielectric response to low and infra-low frequency in layered ferroelectrics", Proc. SPIE 6596, Advanced Optical Materials, Technologies, and Devices, 65961K (25 January 2007); https://doi.org/10.1117/12.726554

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